阅读说明：本技术 空调器及其控制方法 (Air conditioner and control method thereof ) 是由 黄柏良 李欣 毕增利 袁琪 叶强蔚 于 2021-01-12 设计创作，主要内容包括：本公开提供一种空调器及其控制方法,包括：第一换热器、第二换热器；第一换热器、第二换热器并联设置在制冷剂循环回路中,第一换热器连接有第一电子膨胀阀,第二换热器连接有第二电子膨胀阀。本公开的空调器制冷时通过独立控制两个电子膨胀阀,使两个换热器具有两个不同蒸发温度,部分回风经过蒸发温度高的换热器进行降温,部分风经过蒸发温度低的换热器进行除湿,同时兼顾室内降温和控制湿度要求。制冷时根据湿度偏差,实现按需除湿,不存在过度除湿问题,舒适性更高。降温的蒸发温度提高至室内空气露点温度以上,压缩机压缩比减小,整机能耗更低,更节能。(The present disclosure provides an air conditioner and a control method thereof, including: a first heat exchanger, a second heat exchanger; the first heat exchanger and the second heat exchanger are arranged in the refrigerant circulation loop in parallel, the first heat exchanger is connected with a first electronic expansion valve, and the second heat exchanger is connected with a second electronic expansion valve. This disclosed air conditioner is through two electronic expansion valves of independent control during refrigeration, makes two heat exchangers have two different evaporating temperatures, and partial return air is cooled down through the heat exchanger that evaporating temperature is high, and partial wind dehumidifies through the heat exchanger that evaporating temperature is low, compromises indoor cooling and control humidity requirement simultaneously. According to the humidity deviation during refrigeration, realize dehumidification as required, do not have excessive dehumidification problem, the travelling comfort is higher. The cooled evaporation temperature is increased to be higher than the dew point temperature of indoor air, the compression ratio of the compressor is reduced, the energy consumption of the whole machine is lower, and more energy is saved.)

1. An air conditioner, comprising:

a first heat exchanger (1) and a second heat exchanger (2); the first heat exchanger (1) and the second heat exchanger (2) are arranged in a refrigerant circulation loop in parallel, the first heat exchanger (1) is connected with a first electronic expansion valve (3), the first electronic expansion valve (3) is configured to be capable of adjusting the flow of refrigerant entering the first heat exchanger (1), the second heat exchanger (2) is connected with a second electronic expansion valve (4), and the second electronic expansion valve (4) is configured to be capable of adjusting the flow of refrigerant entering the second heat exchanger (2);

the air conditioner also comprises a compressor and a third heat exchanger (5), wherein the compressor comprises a first air suction port (8), a second air suction port (9) and an air exhaust port (10); one end of the first heat exchanger (1) is communicated to the first air suction port (8), one end of the second heat exchanger (2) is communicated to the second air suction port (9), and one end of the third heat exchanger (5) is communicated to the exhaust port (10).

2. The air conditioner according to claim 1, wherein the other end of the first heat exchanger (1) is communicated to the other end of the third heat exchanger (5) through a first electronic expansion valve (3), and the other end of the second heat exchanger (2) is communicated to the other end of the third heat exchanger (5) through a second electronic expansion valve (4).

3. The air conditioner according to claim 1, wherein the first heat exchanger (1) is provided with a first fan (6), the first fan (6) being configured to adjust an amount of air flowing through the first heat exchanger (1); and/or the second heat exchanger (2) is provided with a second fan (7), and the second fan (7) is configured to be capable of adjusting the air volume flowing through the second heat exchanger (2).

4. The air conditioner according to claim 2, wherein a first four-way valve (11) is arranged between the first heat exchanger (1) and the first air suction port (8), an E port of the first four-way valve (11) is communicated with the first heat exchanger (1), an S port of the first four-way valve (11) is communicated with the first air suction port (8), a C port of the first four-way valve (11) is communicated with the third heat exchanger (5), and a D port of the first four-way valve (11) is communicated with the air discharge port (10);

and/or a second four-way valve (12) is arranged between the second heat exchanger (2) and the second air suction port (9), an E port of the second four-way valve (12) is communicated with the second heat exchanger (2), an S port of the second four-way valve (12) is communicated with the second air suction port (9), a C port of the second four-way valve (12) is communicated to the third heat exchanger (5), and a D port of the second four-way valve (12) is communicated to the exhaust port (10);

and/or the compressor comprises a first compression cylinder and a second compression cylinder, the first air suction port (8) supplies air for the first compression cylinder, and the second air suction port (9) supplies air for the second compression cylinder.

5. The air conditioner according to any one of claims 2 to 4, wherein the first heat exchanger (1), the second heat exchanger (2) are provided in an indoor unit (13), and the third heat exchanger (5) is provided in an outdoor unit (14); and/or the third heat exchanger (5) is provided with a third fan (15), and the third fan (15) is configured to adjust the air quantity flowing into the third heat exchanger (5).

6. A control method of an air conditioner according to any one of claims 1 to 5, comprising:

controlling to enter a refrigeration mode;

adjusting the temperature of the refrigerant flowing into the first heat exchanger (1) to be T1 and the pressure of the refrigerant to be P1; the temperature of the refrigerant flowing into the second heat exchanger (2) is adjusted to be T2, the pressure of the refrigerant is P2, T1 is more than T2, and P1 is more than P2.

7. The control method of an air conditioner according to claim 6, wherein the step of adjusting the temperature of the refrigerant flowing into the first heat exchanger (1) to be T1 and the pressure of the refrigerant to be P1 comprises: the air quantity flowing through the first heat exchanger (1) is adjusted through a first fan (6);

and/or the presence of a gas in the gas,

the step of adjusting the temperature of the refrigerant flowing into the second heat exchanger (2) to be T2 and the pressure of the refrigerant to be P2 comprises the following steps: the air quantity flowing through the second heat exchanger (2) is adjusted through the second fan (7).

8. The control method of an air conditioner according to claim 6, wherein the step of adjusting the temperature of the refrigerant flowing into the first heat exchanger (1) to be T1 and the pressure of the refrigerant to be P1 comprises: the flow of the refrigerant entering the first heat exchanger (1) is adjusted through a first electronic expansion valve (3);

and/or the presence of a gas in the gas,

the step of adjusting the temperature of the refrigerant flowing into the second heat exchanger (2) to be T2 and the pressure of the refrigerant to be P2 comprises the following steps: the flow of the refrigerant entering the second heat exchanger (2) is regulated by a second electronic expansion valve (4).

9. The method for controlling an air conditioner according to claim 6, further comprising, after the step of controlling to enter a cooling mode:

detecting indoor temperature Tn and indoor humidity RHn;

calculating a difference value delta T between the indoor temperature Tn and the set temperature Ts as Tn-Ts, and calculating a difference value delta RH between the indoor humidity RHn and the set humidity RHs as RHn-RHs;

if delta T is more than a and | delta RH | is less than or equal to b, increasing the air volume flowing through the first heat exchanger (1);

if delta T is less than-a and | delta RH | is less than or equal to b, reducing the air volume flowing through the first heat exchanger (1);

if Δ T < -a and Δ RH < -b, decreasing the compressor frequency;

if the absolute delta T is less than or equal to a and the absolute delta RH is less than or equal to b, keeping the current operation state;

if the delta T is more than a and the delta RH is more than b, increasing the frequency of the compressor;

if the absolute value delta T is less than or equal to a and the delta RH is more than b, reducing the air volume flowing through the second heat exchanger (2);

if the absolute value delta T is less than or equal to a and the delta RH is less than-b, the air quantity flowing through the second heat exchanger (2) is increased.

10. The control method of an air conditioner according to claim 9, wherein a-0.5, and/or b-5.

11. The control method of an air conditioner according to claim 6, wherein the step of controlling to enter a cooling mode includes:

controlling an E port of the first four-way valve (11) to be communicated with an S port, and controlling a D port to be communicated with a C port; and the port E of the second four-way valve (12) is controlled to be communicated with the port S, and the port D is controlled to be communicated with the port C.

12. The control method of an air conditioner according to any one of claims 6 to 11, characterized by further comprising:

controlling a port C of the first four-way valve (11) to be communicated with a port S, and controlling a port D to be communicated with a port E; and controlling the port C of the second four-way valve (12) to be communicated with the port S, and controlling the port D to be communicated with the port E to enter a heating mode.

13. The method for controlling an air conditioner according to claim 12, further comprising, after the step of entering the heating mode:

detecting indoor temperature Tn and indoor humidity RHn;

calculating the difference value delta T between the indoor temperature Tn and the set temperature Ts as Tn-Ts;

if the delta T is less than-h, the frequency of the compressor is increased;

if delta T is less than or equal to-h and less than-x, the air quantity flowing through the first heat exchanger (1) is increased, and/or the air quantity flowing through the second heat exchanger (2) is increased;

if the absolute delta T is less than or equal to x, keeping the current operation state;

if x is larger than delta T and is less than or equal to h, reducing the air volume flowing through the first heat exchanger (1) and/or reducing the air volume flowing through the second heat exchanger (2);

if Δ T > h, the compressor frequency is reduced.

Technical Field

The disclosure belongs to the technical field of air conditioners, and particularly relates to an air conditioner and a control method thereof.

Background

The thermal comfort of the human body is closely related to not only the temperature of the environment in which the human body is located, but also the humidity of the environment in which the human body is located. The low air humidity can cause the accelerated evaporation of the water in the human body and generate uncomfortable feelings such as dry skin and the like; when the humidity of the air is too high, the feeling of discomfort such as stuffiness and cold and dampness will be generated. At present, most of household air conditioners only control indoor temperature and cannot control humidity, so that the comfort of indoor personnel is poor.

The related art air conditioning unit generally employs a single evaporator, and in order to achieve dehumidification, it is generally required to reduce the temperature of the evaporator below the dew point temperature of the indoor air, which causes two problems: firstly, the evaporating temperature is too low and the power consumption is higher, because the evaporating temperature is low and leads to the compression ratio increase, and the compressor power consumption increases, leads to the complete machine energy consumption to increase. Secondly, the comfort is poor, the dehumidification can be reduced by shortening the running time of the air conditioner, the air conditioner can be started or stopped or the frequency is reduced, and the problem is that the indoor temperature can be controlled to be increased. The air conditioner in the related technology is controlled only according to the temperature, the air conditioner is inevitably started or frequency-increased when being started for refrigeration, so that the dehumidification is continued, the running time of the air conditioner is too long, and people feel dry.

Therefore, the air conditioning unit with a single evaporator cannot meet the requirements of indoor cooling and dehumidification at the same time, and is high in energy consumption and poor in comfort.

Disclosure of Invention

Therefore, the technical problem to be solved by the present disclosure is that an air conditioning unit with a single evaporator cannot meet both requirements of indoor cooling and dehumidification, and has high energy consumption and poor comfort, thereby providing an air conditioner and a control method thereof.

In order to solve the above problems, the present disclosure provides an air conditioner including:

a first heat exchanger, a second heat exchanger; the first heat exchanger and the second heat exchanger are arranged in the refrigerant circulation loop in parallel, the first heat exchanger is connected with a first electronic expansion valve, the first electronic expansion valve is configured to be capable of adjusting the flow of refrigerant entering the first heat exchanger, the second heat exchanger is connected with a second electronic expansion valve, and the second electronic expansion valve is configured to be capable of adjusting the flow of refrigerant entering the second heat exchanger;

the air conditioner also comprises a compressor and a third heat exchanger, wherein the compressor comprises a first air suction port, a second air suction port and an exhaust port; one end of the first heat exchanger is communicated to the first air suction port, one end of the second heat exchanger is communicated to the second air suction port, and one end of the third heat exchanger is communicated to the exhaust port.

In some embodiments, the other end of the first heat exchanger is communicated to the other end of the third heat exchanger through a first electronic expansion valve, and the other end of the second heat exchanger is communicated to the other end of the third heat exchanger through a second electronic expansion valve.

In some embodiments, the first heat exchanger is provided with a first fan configured to regulate an amount of air flowing through the first heat exchanger; and/or the second heat exchanger is provided with a second fan, and the second fan is configured to be capable of adjusting the air volume flowing through the second heat exchanger.

In some embodiments, a first four-way valve is arranged between the first heat exchanger and the first air suction port, an E port of the first four-way valve is communicated with the first heat exchanger, an S port of the first four-way valve is communicated to the first air suction port, a C port of the first four-way valve is communicated to the third heat exchanger, and a D port of the first four-way valve is communicated to the air exhaust port;

and/or a second four-way valve is arranged between the second heat exchanger and the second air suction port, an E port of the second four-way valve is communicated with the second heat exchanger, an S port of the second four-way valve is communicated with the second air suction port, a C port of the second four-way valve is communicated with the third heat exchanger, and a D port of the second four-way valve is communicated with the air exhaust port;

and/or the compressor comprises a first compression cylinder and a second compression cylinder, wherein the first air suction port supplies air for the first compression cylinder, and the second air suction port supplies air for the second compression cylinder.

In some embodiments, the first heat exchanger, the second heat exchanger are disposed within the indoor unit, and the third heat exchanger is disposed within the outdoor unit; and/or the third heat exchanger is provided with a third fan, and the third fan is configured to regulate the air volume flowing into the third heat exchanger.

A control method for an air conditioner using the above method, in some embodiments, includes:

controlling to enter a refrigeration mode;

adjusting the temperature of the refrigerant flowing into the first heat exchanger to be T1 and the pressure of the refrigerant to be P1; the temperature of the refrigerant flowing into the second heat exchanger is adjusted to be T2, the pressure of the refrigerant is P2, and T1 > T2, P1> P2.

The purpose of the present disclosure and the technical problems solved thereby can be further achieved by the following technical measures.

In some embodiments, the step of adjusting the temperature of the refrigerant flowing into the first heat exchanger to T1 and the pressure of the refrigerant to P1 comprises: adjusting the air quantity flowing through the first heat exchanger by using a first fan;

and/or the presence of a gas in the gas,

the step of adjusting the temperature of the refrigerant flowing into the second heat exchanger to T2 and the pressure of the refrigerant to P2 includes: and the air quantity flowing through the second heat exchanger is adjusted by the second fan.

In some embodiments, the step of adjusting the temperature of the refrigerant flowing into the first heat exchanger to T1 and the pressure of the refrigerant to P1 comprises: regulating the flow of the refrigerant entering the first heat exchanger through a first electronic expansion valve;

and/or the presence of a gas in the gas,

the step of adjusting the temperature of the refrigerant flowing into the second heat exchanger to T2 and the pressure of the refrigerant to P2 includes: the flow of refrigerant into the second heat exchanger is regulated by a second electronic expansion valve.

In some embodiments, after the step of controlling to enter the cooling mode, the method further includes:

detecting indoor temperature Tn and indoor humidity RHn;

calculating a difference value delta T between the indoor temperature Tn and the set temperature Ts as Tn-Ts, and calculating a difference value delta RH between the indoor humidity RHn and the set humidity RHs as RHn-RHs;

if delta T is larger than a and | delta RH | is less than or equal to b, increasing the air volume flowing through the first heat exchanger;

if delta T is less than-a and | delta RH | is less than or equal to b, reducing the air volume flowing through the first heat exchanger;

if Δ T < -a and Δ RH < -b, decreasing the compressor frequency;

if the absolute delta T is less than or equal to a and the absolute delta RH is less than or equal to b, keeping the current operation state;

if the delta T is more than a and the delta RH is more than b, increasing the frequency of the compressor;

if the absolute value delta T is less than or equal to a and the delta RH is more than b, reducing the air volume flowing through the second heat exchanger;

if the absolute value delta T is less than or equal to a and the delta RH is less than-b, the air quantity flowing through the second heat exchanger is increased.

In some embodiments, a is 0.5, and/or b is 5.

In some embodiments, the step of controlling entry into the cooling mode comprises:

controlling an E port of the first four-way valve to be communicated with an S port, and controlling a D port to be communicated with a C port; and the port E of the second four-way valve is controlled to be communicated with the port S, and the port D is controlled to be communicated with the port C.

In some embodiments, the control method further comprises:

controlling a port C of the first four-way valve to be communicated with a port S, and controlling a port D to be communicated with a port E; and controlling the port C of the second four-way valve to be communicated with the port S and the port D to be communicated with the port E, and entering a heating mode.

In some embodiments, after the step of entering the heating mode, the method further includes:

detecting indoor temperature Tn and indoor humidity RHn;

calculating the difference value delta T between the indoor temperature Tn and the set temperature Ts as Tn-Ts;

if the delta T is less than-h, the frequency of the compressor is increased;

if delta T is less than or equal to-h and less than-x, the air quantity flowing through the first heat exchanger is increased, and/or the air quantity flowing through the second heat exchanger is increased;

if the absolute delta T is less than or equal to x, keeping the current operation state;

if x is larger than delta T and is smaller than or equal to h, reducing the air volume flowing through the first heat exchanger and/or reducing the air volume flowing through the second heat exchanger;

if Δ T > h, the compressor frequency is reduced.

The air conditioner and the control method thereof provided by the present disclosure have at least the following beneficial effects:

the air conditioner disclosed can realize independent control of temperature and humidity, and through the compressor of the two suction structures of two compression cylinders and two electronic expansion valves of independent control during refrigeration, make two heat exchangers have two different evaporating temperatures, partial return air passes through the heat exchanger that evaporating temperature is high, and partial wind passes through the heat exchanger that evaporating temperature is low, and the heat exchanger that evaporating temperature is high is responsible for the cooling, and the heat exchanger that evaporating temperature is low is responsible for the dehumidification, and sensible heat and latent heat separately independent processing compromise indoor cooling and control humidity requirement simultaneously. According to the humidity deviation during refrigeration, realize dehumidification as required, do not have excessive dehumidification problem, the travelling comfort is higher. The cooled evaporation temperature is increased to be higher than the dew point temperature of indoor air, the compression ratio of the compressor is reduced, the energy consumption of the whole machine is lower, and more energy is saved.

Drawings

Fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present disclosure;

FIG. 2 is a schematic flow diagram of refrigerant in a cooling mode of an air conditioner according to an embodiment of the present disclosure;

fig. 3 is a schematic flow diagram of a refrigerant in a cooling mode of an air conditioner according to an embodiment of the disclosure.

The reference numerals are represented as:

1. a first heat exchanger; 2. a second heat exchanger; 3. a first electronic expansion valve; 4. a second electronic expansion valve; 5. a third heat exchanger; 6. a first fan; 7. a second fan; 8. a first air intake port; 9. a second air suction port; 10. an exhaust port; 11. a first four-way valve; 12. a second four-way valve; 13. an indoor unit; 14. an outdoor unit; 15. a third fan; 16. a compressor.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

As shown in fig. 1 to 3, the present embodiment provides an air conditioner including: a first heat exchanger 1 and a second heat exchanger 2; the first heat exchanger 1 and the second heat exchanger 2 are arranged in a refrigerant circulation loop in parallel, the first heat exchanger 1 is connected with a first electronic expansion valve 3, the first electronic expansion valve 3 is configured to be capable of adjusting the flow of refrigerant entering the first heat exchanger 1, the second heat exchanger 2 is connected with a second electronic expansion valve 4, and the second electronic expansion valve 4 is configured to be capable of adjusting the flow of refrigerant entering the second heat exchanger 2;

the air conditioner also comprises a compressor 16 and a third heat exchanger 5, wherein the compressor 16 comprises a first air suction port 8, a second air suction port 9 and an air exhaust port 10, the compressor 16 comprises a first compression cylinder and a second compression cylinder, the first air suction port 8 supplies air for the first compression cylinder, and the second air suction port 9 supplies air for the second compression cylinder. One end of the first heat exchanger 1 is communicated to a first air suction port 8, a first compression cylinder sucks the refrigerant sent by the first heat exchanger 1 for compression, one end of the second heat exchanger 2 is communicated to a second air suction port 9, the second compression cylinder sucks the refrigerant sent by the second heat exchanger 2 for compression, and one end of the third heat exchanger 5 is communicated to an air exhaust port 10.

This disclosed air conditioner, through two electronic expansion valves of independent control during refrigeration, make two heat exchangers have two different evaporating temperatures, partial return air is through the heat exchanger that evaporating temperature is high, and partial wind is through the heat exchanger that evaporating temperature is low, and the heat exchanger that evaporating temperature is high is responsible for the cooling, and the heat exchanger that evaporating temperature is low is responsible for the dehumidification, and sensible heat and latent heat separately independent processing compromise indoor cooling and control humidity requirement simultaneously. According to the humidity deviation during refrigeration, realize dehumidification as required, do not have excessive dehumidification problem, the travelling comfort is higher. The cooled evaporation temperature is increased to be higher than the dew point temperature of indoor air, the compression ratio of the compressor 16 is reduced, the energy consumption of the whole machine is lower, and more energy is saved.

In some embodiments, in the refrigerant circulation circuit, in order to achieve cooling or heating in the room, the other end of the first heat exchanger 1 is communicated to the other end of the third heat exchanger 5 through the first electronic expansion valve 3, and the other end of the second heat exchanger 2 is communicated to the other end of the third heat exchanger 5 through the second electronic expansion valve 4.

In some embodiments, in order to adjust the air volume flowing through the first heat exchanger 1, and adjust the heat exchange amount and the heat exchange efficiency of the first heat exchanger 1 with the air, the first heat exchanger 1 is provided with a first fan 6, and the first fan 6 is configured to adjust the air volume flowing through the first heat exchanger 1.

In some embodiments, in order to adjust the air volume flowing through the first heat exchanger 1, and adjust the heat exchange amount and the heat exchange efficiency of the first heat exchanger 1 with the air, the second heat exchanger 2 is provided with a second fan 7, and the second fan 7 is configured to be capable of adjusting the air volume flowing through the second heat exchanger 2.

In some embodiments, in order to switch the cooling and heating modes of the air conditioner, a first four-way valve 11 is arranged between the first heat exchanger 1 and the first air suction port 8, a port E of the first four-way valve 11 is communicated with the first heat exchanger 1, a port S of the first four-way valve 11 is communicated with the first air suction port 8, a port C of the first four-way valve 11 is communicated with the third heat exchanger 5, and a port D of the first four-way valve 11 is communicated with the air discharge port 10.

In some embodiments, in order to switch the cooling and heating modes of the air conditioner, a second four-way valve 12 is arranged between the second heat exchanger 2 and the second suction port 9, an E port of the second four-way valve 12 is communicated with the second heat exchanger 2, an S port of the second four-way valve 12 is communicated with the second suction port 9, a C port of the second four-way valve 12 is communicated with the third heat exchanger 5, and a D port of the second four-way valve 12 is communicated with the exhaust port 10.

In some embodiments, the first heat exchanger 1 and the second heat exchanger 2 are disposed in the indoor unit 13 to perform temperature and humidity regulation on indoor air, and the third heat exchanger 5 is disposed in the outdoor unit 14 to perform heat exchange with outdoor air.

In some embodiments, in order to adjust the air volume flowing through the third heat exchanger 5, and adjust the heat exchange amount and the heat exchange efficiency of the third heat exchanger 5 with the air, the third heat exchanger 5 is provided with a third fan 15, and the third fan 15 is configured to adjust the air volume flowing into the third heat exchanger 5.

The air conditioner of the present disclosure is divided into an outdoor unit 14 and an indoor unit 13, the outdoor unit 14 is installed outdoors, the indoor unit 13 is installed indoors, and a refrigerant circulates between the outdoor unit 14 and the indoor unit 13 through a connection pipe to form a refrigerant circulation circuit. The third fan 15 rotates to drive outdoor air to flow through the third heat exchanger 5, and heat exchange between the air and the third heat exchanger 5 is carried out; the first fan 6 rotates to drive indoor air to flow through the first heat exchanger 1, heat exchange between the air and the first heat exchanger 1 is carried out, and the purpose of cooling the indoor air is achieved; the second fan 7 rotates to drive the indoor air to flow through the second heat exchanger 2, so that heat exchange between the air and the second heat exchanger 2 is carried out, and the purpose of dehumidifying the indoor air is achieved.

As shown in fig. 2 and 3, the present disclosure provides a control method using the air conditioner, which in some embodiments includes:

s1 control enters cooling mode.

The indoor heat exchanger temperature is lower under the refrigeration mode, and when the temperature of the heat exchanger is lower than the indoor dew point temperature, condensation can be formed on the surface of the heat exchanger.

S2 adjusting the temperature of the refrigerant flowing into the first heat exchanger 1 to T1 and the pressure of the refrigerant to P1; the temperature of the refrigerant flowing into the second heat exchanger 2 is adjusted to be T2, the pressure of the refrigerant is P2, T1 is greater than T2, P1 is greater than P2, the evaporation temperature of the second heat exchanger 2 is lower than the evaporation temperature of the first heat exchanger 1, the first heat exchanger 1 with the higher evaporation temperature is used for cooling the indoor, and the second heat exchanger 2 with the lower evaporation temperature is used for dehumidifying the indoor.

In some embodiments, the step of adjusting the temperature of the refrigerant flowing into the first heat exchanger 1 to T1 and the pressure of the refrigerant to P1 comprises: the air quantity flowing through the first heat exchanger 1 is adjusted by a first fan 6;

and/or the presence of a gas in the gas,

the step of adjusting the temperature of the refrigerant flowing into the second heat exchanger 2 to T2 and the pressure of the refrigerant to P2 includes: the air quantity flowing through the second heat exchanger 2 is adjusted by the second fan 7.

In some embodiments, the step of adjusting the temperature of the refrigerant flowing into the first heat exchanger 1 to T1 and the pressure of the refrigerant to P1 comprises: the flow of the refrigerant entering the first heat exchanger 1 is regulated by the first electronic expansion valve 3;

and/or the presence of a gas in the gas,

the step of adjusting the temperature of the refrigerant flowing into the second heat exchanger 2 to T2 and the pressure of the refrigerant to P2 includes: the flow of refrigerant into the second heat exchanger 2 is regulated by the second electronic expansion valve 4.

By controlling the throttling effect of the first electronic expansion valve 3 and the second electronic expansion valve 4 and controlling the rotating speed of the first fan 6 and the second fan 7, the temperature and the pressure of the two-phase refrigerant coming out of the second electronic expansion valve 4 are lower than those of the two-phase refrigerant coming out of the first electronic expansion valve 3, and the evaporation temperature of the second heat exchanger 2 is lower than that of the first heat exchanger 1. The first heat exchanger 1 with higher evaporation temperature is used for indoor cooling, and the second heat exchanger 2 with lower evaporation temperature is used for indoor dehumidification.

In some embodiments, after the step of controlling to enter the cooling mode, in the cooling operation process, the air conditioner is adjusted for the indoor temperature and the indoor humidity, specifically including:

and detecting the indoor temperature Tn and the indoor humidity RHn.

Calculating a difference value delta T between the indoor temperature Tn and the set temperature Ts as Tn-Ts, and calculating a difference value delta RH between the indoor humidity RHn and the set humidity RHs as RHn-RHs;

if delta T is more than a and | delta RH | ≦ b, it indicates that the indoor humidity is in a proper range, and the indoor temperature is relatively high, and the indoor temperature needs to be reduced, and by increasing the rotating speed of the first fan 6, the air volume flowing through the first heat exchanger 1 is increased, the sensible heat of the air conditioner is increased, and the indoor temperature is reduced.

If delta T is less than-a and | delta RH | ≦ b, the indoor humidity is in a proper range, the indoor temperature is low, the indoor temperature needs to be increased, the air quantity flowing through the first heat exchanger 1 is reduced, the rotating speed of the first fan 6 is reduced under the condition, the sensible heat of the prototype is reduced, and the indoor temperature is increased.

If Δ T < -a and Δ RH < -b, this indicates that the indoor humidity is low and the indoor temperature is low, it is necessary to raise the indoor temperature and the indoor humidity, in which case the compressor 16 frequency is lowered, the amount of sensible heat and dehumidification is reduced, and it is helpful to raise the indoor temperature and the indoor humidity.

If the absolute value of delta T is less than or equal to a and the absolute value of delta RH is less than or equal to b, the indoor temperature and the indoor humidity are both in proper ranges, and the prototype is kept in the current operation state.

If Δ T > a and Δ RH > b, this indicates that the indoor temperature is high and the indoor humidity is high, and it is necessary to reduce the indoor temperature and the indoor humidity, in which case the frequency of the compressor 16 is increased to increase the sensible heat and the dehumidification capacity of the prototype, which helps to reduce the indoor temperature and the indoor humidity.

If | Δ T | ≦ a and Δ RH > b, it indicates that the indoor temperature is in a suitable range, and the indoor humidity is relatively high, and it is necessary to reduce the indoor humidity and reduce the air volume flowing through the second heat exchanger 2, in this case, the rotation speed of the second fan 7 is reduced, the dehumidification capacity of the prototype is improved, and the reduction of the indoor humidity is facilitated.

If the | Delta T | is less than or equal to a and the Delta RH is less than-b. This shows that the indoor temperature is in a proper range, and the indoor humidity is low, and the indoor humidity needs to be increased, and the air volume flowing through the second heat exchanger 2 needs to be increased, so that the rotating speed of the second fan 7 is increased, the dehumidification capacity of the prototype is reduced, and the improvement of the indoor humidity is facilitated.

In some embodiments, the smaller the value of a, the better it is from the viewpoint of comfort, and the larger a, the better it is from the viewpoint of air conditioner operation stability and reliability, so that the comfort and the air conditioner stability need to be balanced, a is a range value, preferably, a is 0.5, that is, the temperature is within the range of the set value ± 0.5 ℃, and the indoor temperature is considered to be in a proper range.

In some embodiments, the smaller the value of b, the better it is from the viewpoint of comfort, and the larger b, the better it is from the viewpoint of air conditioner operation stability and reliability, so that the comfort and the air conditioner stability need to be balanced, b is a range value, preferably, b is 5, that is, the humidity is within the range of ± 5% of the set value, and the indoor humidity is considered to be in a proper range.

In some embodiments, the step of controlling entry into the cooling mode comprises:

controlling an E port of the first four-way valve 11 to be communicated with an S port, and controlling a D port to be communicated with a C port; and the port E of the second four-way valve 12 is controlled to be communicated with the port S, and the port D is controlled to be communicated with the port C.

The high-temperature and high-pressure gaseous refrigerant of the double-suction single-exhaust compressor 16 enters the ports D of the first four-way valve 11 and the second four-way valve 12, respectively, then enters the third heat exchanger 5 from the ports C of the first four-way valve 11 and the second four-way valve 12 to be cooled and condensed, and the high-pressure liquid refrigerant coming out of the third heat exchanger 5 enters the first electronic expansion valve 3 and the second electronic expansion valve 4, respectively, and is throttled into a low-temperature and low-pressure two-phase refrigerant. The two-phase refrigerant from the first electronic expansion valve 3 enters the first heat exchanger 1 to absorb heat and evaporate, and the gaseous refrigerant from the first heat exchanger 1 passes through the E port and the S port of the first four-way valve 11, is sucked into the double suction compressor 16, and is compressed again. The two-phase refrigerant from the second electronic expansion valve 4 enters the second heat exchanger 2 to absorb heat and evaporate, and the gaseous refrigerant from the second heat exchanger 2 passes through the E port and the S port of the second four-way valve 12, is sucked into the double suction compressor 16, and is compressed again. The two compressed high-temperature and high-pressure gaseous refrigerants are converged at the exhaust port 10 and then discharged out of the compressor 16 and enter the D port of the first four-way valve 11 and the D port of the second four-way valve 12, respectively, thereby completing the whole refrigerant cycle.

In some embodiments, the control method further comprises:

controlling a port C of the first four-way valve 11 to be communicated with a port S, and controlling a port D to be communicated with a port E; and controlling the port C of the second four-way valve 12 to be communicated with the port S, and controlling the port D to be communicated with the port E to enter a heating mode.

The high-temperature and high-pressure gaseous refrigerant of the double-suction single-exhaust compressor 16 respectively enters the ports D of the first four-way valve 11 and the second four-way valve 12, then respectively enters the first heat exchanger 1 and the second heat exchanger 2 from the ports E of the first four-way valve 11 and the second four-way valve 12, is cooled and condensed by the first heat exchanger 1 and the second heat exchanger 2, and the high-pressure liquid refrigerant coming out of the first heat exchanger 1 and the second heat exchanger 2 respectively enters the first electronic expansion valve 3 and the second electronic expansion valve 4 and is throttled into a low-temperature and low-pressure two-phase refrigerant.

In some embodiments, after the step of entering the heating mode, the method further includes:

detecting indoor temperature Tn and indoor humidity RHn;

calculating the difference value delta T between the indoor temperature Tn and the set temperature Ts as Tn-Ts;

if Δ T < -h, this indicates that the room temperature is too low, a rapid increase in room temperature is required, in which case the compressor 16 frequency is increased to rapidly increase the prototype heating capacity, which helps to rapidly increase the room temperature.

If delta T is less than or equal to-x, the indoor temperature is low, the indoor temperature needs to be increased, and the rotating speed of the first fan 6 is increased under the condition that the indoor temperature needs to be increased, so that the air quantity flowing through the first heat exchanger 1 is increased; and/or the rotating speed of the second fan 7 is increased, the air quantity flowing through the second heat exchanger 2 is increased, the sample machine heating capacity can be improved, and the indoor temperature can be increased.

If the absolute value delta T is less than or equal to x, the indoor temperature is in a proper range, and the prototype is kept in the current operation state.

If x is more than delta T and less than or equal to h; this shows that the indoor temperature is too high, and the indoor temperature needs to be reduced, under this condition, the rotating speed of the first fan 6 is reduced, and the air volume flowing through the first heat exchanger 1 is reduced; and/or the rotating speed of the second fan 7 is reduced, the air quantity flowing through the second heat exchanger 2 is reduced, the sample machine heating quantity can be reduced, and the indoor temperature is favorably reduced.

If Δ T > h, this indicates that the room temperature is too high, requiring a rapid decrease in the room temperature, in which case the compressor 16 frequency is decreased, rapidly reducing the amount of prototype heating, helping to rapidly decrease the high room temperature.

And h and x are preset temperature difference values, and values are assigned according to the temperature control condition.

The refrigerant circulation has two evaporation temperatures, so that the evaporation pressure of the refrigerant in the high-temperature evaporator is higher, and the compression ratio is smaller. Compared with a single-evaporation-temperature refrigerant circulating system, the dual-evaporation-temperature refrigerant circulating system used in the disclosure has the advantages of smaller average compression ratio and higher system energy efficiency. When the indoor air passes through the heat exchanger with higher evaporation temperature, only the temperature is reduced, and the moisture content is not reduced; as the indoor air passes through the heat exchanger, which has a lower evaporation temperature, both the temperature and the moisture content are reduced. For indoor air, the temperature and the humidity can be respectively controlled to meet the requirements, the excessive dehumidification condition is avoided, the indoor comfort is improved, and meanwhile, the energy is saved.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present disclosure is to be considered as limited only by the preferred embodiments and not limited to the specific embodiments described herein, and all changes, equivalents and modifications that come within the spirit and scope of the disclosure are desired to be protected. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.