阅读说明：本技术 温湿度测量装置及测量方法 (Temperature and humidity measuring device and measuring method ) 是由 沈宇纲 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种温湿度测量装置,其用于空气干球温湿度测量,包括保温隔湿壳体用于供被测空气穿过；温度传感器固定在保温隔湿壳体中,且靠近保温隔湿壳体被测空气进入一端,其表面为光滑表面；加热器固定在温度传感器后方的保温隔湿壳体中；混合器固定在加热器后方的保温隔湿壳体中用于提高空气干球温度的均匀性；露点温度传感器固定在混合器后方的保温隔湿壳体中用于获得露点温度；取样风机固定在露点温度传感器后方的保温隔湿壳体另一端口处。本发明还公开了一种温湿度测量装置。本发明能避免由于低温高湿环境霜雾造成传感器失效/温湿度测量不准确。(The invention discloses a temperature and humidity measuring device, which is used for measuring the temperature and humidity of an air dry bulb and comprises a heat-insulating and moisture-insulating shell, a temperature-sensing sensor and a temperature-sensing sensor, wherein the heat-insulating and moisture-sensing shell is used for allowing measured air to pass through; the temperature sensor is fixed in the heat-insulation and moisture-insulation shell, and is close to one end of the heat-insulation and moisture-insulation shell where the air to be measured enters, and the surface of the temperature sensor is a smooth surface; the heater is fixed in the heat-insulating and moisture-insulating shell behind the temperature sensor; the mixer is fixed in a heat-insulating and moisture-insulating shell behind the heater and is used for improving the uniformity of the temperature of the air dry balls; the dew point temperature sensor is fixed in a heat-insulating and moisture-insulating shell behind the mixer and is used for obtaining the dew point temperature; the sampling fan is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor. The invention also discloses a temperature and humidity measuring device. The invention can avoid sensor failure/inaccurate temperature and humidity measurement caused by low-temperature and high-humidity environment frost and fog.)

1. The utility model provides a temperature and humidity measurement device, its is used for air dry bulb temperature and humidity measurement, its characterized in that includes:

the heat-insulating and moisture-insulating shell is used for the tested air to pass through;

the temperature sensor is fixed in the heat-insulation and moisture-insulation shell, is close to one end of the heat-insulation and moisture-insulation shell where the air to be detected enters, and has a smooth surface;

the heater is fixed in the heat-preservation and moisture-insulation shell behind the temperature sensor;

the mixer is fixed in the heat-preservation and moisture-insulation shell behind the heater and is used for improving the uniformity of the temperature of the air dry bulb;

the dew point temperature sensor is fixed in a heat-insulating and moisture-insulating shell behind the mixer and used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature;

and the sampling fan is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor.

2. The temperature and humidity measuring device according to claim 1, wherein: the measured air flow velocity passing through the temperature sensor is a, and a is more than or equal to 3 m/s.

3. The temperature and humidity measuring device according to claim 1, wherein: the temperature sensor is a platinum resistor.

4. The temperature and humidity measuring device according to claim 1, wherein: the heater is heated to reduce the relative humidity of the air by 5-15% RH.

5. The temperature and humidity measuring device according to claim 1, wherein: the mixer made the air dry bulb temperature uniformity better than 0.1 ℃.

6. The temperature and humidity measuring device according to claim 1, wherein: the measuring accuracy of a temperature sensor in the dew point temperature sensor is better than +/-0.1 ℃, and the measuring accuracy of a relative humidity sensor is better than +/-2% RH.

7. A temperature and humidity measurement method is used for measuring the temperature and humidity of an air dry bulb and is characterized by comprising the following steps:

s1, measuring the temperature of the measured air at a preset flow rate to obtain a first measured temperature;

s2, heating the air to be detected, and reducing the relative humidity of the air to be detected;

s3, improving the temperature uniformity of the detected air dry bulb;

s4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;

and S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature.

8. The temperature and humidity measuring method according to claim 7, characterized in that: the preset flow rate is a, and a is more than or equal to 3 m/s.

9. The temperature and humidity measuring method according to claim 7, characterized in that: in step S2, the relative humidity of the air to be measured is lowered by 5% RH to 15% RH.

10. The temperature and humidity measuring method according to claim 7, characterized in that: in step S3, the uniformity of the temperature of the air dry bulb to be tested is improved to be better than 0.1 ℃.

11. The temperature and humidity measuring method according to claim 7, characterized in that: in step S4, the temperature measurement accuracy is better than + -0.1 deg.C, and the relative humidity measurement accuracy is better than + -2% RH.

Technical Field

The invention relates to temperature and humidity measurement, in particular to a temperature and humidity measurement device for a low-temperature high-humidity environment. The invention also relates to a temperature and humidity measurement method for the low-temperature high-humidity environment.

Background

In the field of air conditioner manufacturing for home, commercial and automobile, some manufacturers are concerned more and more about the performance of the air conditioner heat pump during operation, and even research the performance under extreme weather conditions. The low-temperature high-humidity environment is the most frosting condition of the air heat pump, and the research on the frosting performance of the air heat pump is regarded by many manufacturers.

When the temperature of the air dry bulb is higher than 0 ℃, the saturated relative humidity can reach 100 percent RH; when the temperature of the air dry bulb is less than or equal to 0 ℃, the saturated relative humidity is less than 100 percent RH. When the frost point temperature of the air is equal to the dry bulb temperature, the water vapor begins to freeze (also called air ice saturation), and the relative humidity of the air reaches the extreme value at the dry bulb temperature. When the air enters the ice saturation state, the humidity sensor which is conventionally purchased in the market can not measure the air. At this time, the diffused frost in the air is accumulated on the protective cover of the probe of the sensor, resulting in the failure of the sensor. In this case, even if a humidity probe with a built-in heating device is used, frost cannot be prevented from accumulating on the protective cover; a humidity sensor with a hot air defrosting device is required. The heating of the humidity sensor with the hot air dew and frost removal function on the market is automatically controlled, and during heating, the humidity sensor fails to measure until the frost is removed completely. When the sensor fails, the conventional practice is to keep the sensor reading before heating is initiated, and the control system will also maintain the output of the humidifier. The control algorithm has certain effect on the environment that the working condition is far away from the air saturated by the ice surface and frost fog is occasionally generated in the air. However, for conditions close to ice saturation, frost and fog are frequently generated in the air, and the heating device in the sensor is frequently operated, which results in significant fluctuations in the humidity of the environmental chamber. For this reason, the problem of measuring humidity needs to be solved first.

When the operating mode is close to ice saturation (operating mode and saturation point's relative humidity deviation is at 0 ~ 5% RH), because the reason of air temperature and humidity field homogeneity, in humidification section low reaches, a large amount of water smoke or frost fog can appear in the air usually, and these frost fog not only influence humidity and measure, still can cause the indoor a large amount of frost fog that appears of environment, lead to the long-time overshoot of relative humidity, still can accumulate on the coil pipe in a large number even, lead to the air-cooler to stop work very fast. Therefore, in order to improve the control quality and prolong the working time of the air cooler, the accuracy and the failure of the humidity measurement should be ensured firstly.

Disclosure of Invention

In this summary, a series of simplified form concepts are introduced that are simplifications of the prior art in this field, which will be described in further detail in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The invention aims to solve the technical problem of providing a temperature and humidity measuring device which can avoid sensor failure caused by low-temperature and high-humidity environment frost and fog.

The invention aims to solve another technical problem of providing a temperature and humidity measurement method which can avoid inaccurate temperature and humidity measurement caused by low-temperature and high-humidity environment frost fog.

The low-temperature high-humidity environment means that the temperature of the air dry bulb is less than or equal to 0 ℃, and the relative humidity deviation of the air relative humidity and the ice surface saturation state corresponding to the temperature of the air dry bulb is less than or equal to 5% RH.

In order to solve the above technical problems, the present invention provides a temperature and humidity measuring device for measuring temperature and humidity of an air dry bulb, comprising:

the heat-insulating and moisture-insulating shell is used for the tested air to pass through; the pipeline between the heater and the dew point temperature sensor is insulated, so that the reduction of relative humidity and the deterioration of temperature uniformity are avoided;

the temperature sensor is fixed in the heat-insulation and moisture-insulation shell, is close to one end of the heat-insulation and moisture-insulation shell where the air to be detected enters, and has a smooth surface;

alternatively, the measured air flow velocity through the temperature sensor is a, a is more than or equal to 3m/s, and frost fog cannot be accumulated on the platinum resistor surface with smoothness (the smoothness refers to that the surface roughness is equal to or less than 3.2 mu m) because of certain flow velocity of the measured air.

Alternatively, a platinum resistor is used as the temperature sensor.

The heater is fixed in the heat-preservation and moisture-insulation shell behind the temperature sensor;

alternatively, the amount of heat applied by the heater is controlled to reduce the relative humidity of the dried spheres by 5% RH to 15% RH, preferably by 10% RH.

The mixer is fixed in the heat-preservation and moisture-insulation shell behind the heater and is used for improving the uniformity of the temperature of the air dry bulb;

optionally, the mixer makes the temperature uniformity of the air dry balls better than 0.1 ℃, i.e. the temperature difference between the air dry balls is less than 0.1 ℃.

The dew point temperature sensor is fixed in a heat-insulating and moisture-insulating shell behind the mixer and used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature;

optionally, the measurement accuracy of the temperature sensor in the dew point temperature sensor is better than ± 0.1 ℃, that is, the measurement error is less than ± 0.1 ℃, and the measurement accuracy of the relative humidity sensor is better than ± 2% RH, that is, the measurement error is less than ± 2% RH.

And the sampling fan is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor.

The invention provides a temperature and humidity measurement method for measuring the temperature and humidity of an air dry bulb, which comprises the following steps:

s1, measuring the temperature of the measured air at a preset flow rate to obtain a first measured temperature, namely the final temperature obtained by measurement;

optionally, the preset flow rate is a, and a is more than or equal to 3 m/s.

S2, heating the air to be detected, and reducing the relative humidity of the air to be detected;

optionally, the relative humidity of the air to be measured is reduced by 5% RH to 15% RH, preferably by 10% RH;

s3, improving the temperature uniformity of the detected air dry bulb;

optionally, the temperature uniformity of the measured air dry spheres is improved to be better than 0.1 ℃, namely the temperature difference between the air dry spheres is less than 0.1 ℃.

S4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;

optionally, the measurement accuracy of the temperature is better than +/-0.1 ℃, and the measurement accuracy of the relative humidity is better than +/-2% RH.

And S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature, and taking the initial relative humidity as the humidity obtained by the measuring device.

According to the temperature and humidity measuring device disclosed by the invention, measured air firstly passes through the temperature sensor, then passes through 1 heater, then passes through 1 mixer, then passes through 1 dew point temperature sensor and then passes through 1 fan. The air firstly passes through a smooth platinum resistor, frost mist cannot be accumulated on the surface of the smooth platinum resistor due to the fact that the air flow has a certain flow rate (more than or equal to 3m/s), then the air passes through a heater, the relative humidity of the air is reduced, the heating quantity is controlled to reduce the relative humidity by about 10% RH, then the air passes through a mixer, the uniformity of the air dry bulb temperature is better than 0.1 ℃, then the dew point temperature is obtained through calculation by measuring the dry bulb temperature and the relative humidity, and then the relative humidity of an inlet and an outlet is calculated through the calculated dew point temperature and an inlet temperature sensor. By adopting the temperature and humidity measuring device, under the low-temperature and high-humidity environment, when the precision of the dry-bulb temperature sensor is better than +/-0.1 ℃ and the precision of the relative humidity sensor is better than +/-2% RH, the calculated relative humidity precision is better than +/-3% RH (namely the measurement error is less than +/-3% RH). The invention not only avoids the influence of frost and fog on the sensor, but also has higher temperature and humidity measurement accuracy.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification. The drawings are not necessarily to scale, however, and may not be intended to accurately reflect the precise structural or performance characteristics of any given embodiment, and should not be construed as limiting or restricting the scope of values or properties encompassed by exemplary embodiments in accordance with the invention. The invention will be described in further detail with reference to the following detailed description and accompanying drawings:

fig. 1 is a schematic structural diagram of the temperature and humidity measuring device of the present invention.

Fig. 2 is a schematic flow chart of the temperature and humidity measurement method of the present invention.

Description of the reference numerals

Heat-insulating and moisture-insulating shell 1

Temperature sensor 2

Heater 3

Mixer 4

Dew point temperature sensor 5

A sampling fan 6.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and technical effects of the present invention will be fully apparent to those skilled in the art from the disclosure in the specification. The invention is capable of other embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the general spirit of the invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. The following exemplary embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solutions of these exemplary embodiments to those skilled in the art. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Like reference numerals refer to like elements throughout the drawings.

A first embodiment, as shown in fig. 1, in which an arrow indicates a flowing direction of air to be measured, provides a temperature and humidity measuring apparatus for measuring temperature and humidity of an air dry bulb, including:

the heat-insulating and moisture-insulating shell 1 is used for allowing air to be measured to pass through; the shape of the shell is not limited, and the shell can be manufactured according to actual conditions, but should be made of heat-insulating and moisture-insulating materials. The pipeline between the heater and the dew point temperature sensor is insulated, so that the reduction of relative humidity and the deterioration of temperature uniformity are avoided; the thermal insulation material generally refers to a material with a thermal conductivity less than or equal to 0.05W/mK,

the temperature sensor 2 is fixed in the heat-insulation and moisture-insulation shell 1, is close to one end of the heat-insulation and moisture-insulation shell 1 where the air to be detected enters, and has a smooth surface;

a heater 3 fixed in the heat-insulating and moisture-insulating casing 1 behind the temperature sensor 2;

a mixer 4 fixed in the heat-insulating and moisture-insulating casing 1 behind the heater 3 for improving the uniformity of the temperature of the air dry bulb;

the dew point temperature sensor 5 is fixed in the heat-insulating and moisture-insulating shell 1 behind the mixer 4 and is used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature;

and the sampling fan 6 is fixed at the other port of the heat-preservation and moisture-insulation shell 1 behind the dew point temperature sensor 5.

In a second embodiment, the present invention provides a temperature and humidity measuring device for measuring temperature and humidity of an air dry bulb, including:

the heat-insulating and moisture-insulating shell 1 is used for allowing air to be measured to pass through; the shape of the shell is not limited, the shell can be manufactured according to actual conditions, the flow velocity of the measured air passing through the temperature sensor is a, and a is more than or equal to 3 m/s;

the temperature sensor 2 adopts a platinum resistor as a temperature sensor, is fixed in the heat-insulation and moisture-insulation shell 1, is close to one end of the heat-insulation and moisture-insulation shell 1 where the air to be detected enters, and has a smooth surface;

and a heater 3 fixed in the heat-insulating and moisture-proof case 1 behind the temperature sensor 2, wherein the heating amount of the heater 3 is controlled to reduce the relative humidity of the dry bulb by 5% RH-15% RH, preferably by 10% RH.

And the mixer 4 is fixed in the heat-insulating and moisture-insulating shell 1 behind the heater 3, and is used for improving the uniformity of the temperature of the air dry balls to be better than 0.1 ℃, namely the temperature difference between the air dry balls is less than 0.1 ℃.

The dew point temperature sensor 5 is fixed in the heat-insulating and moisture-insulating shell 1 behind the mixer 4, the measurement accuracy of a temperature sensor in the dew point temperature sensor is better than +/-0.1 ℃, the measurement accuracy of a relative humidity sensor is better than +/-2% RH, and the dew point temperature sensor 5 is used for obtaining the temperature and calculating the relative humidity to obtain the dew point temperature.

And the sampling fan 6 is fixed at the other port of the heat-preservation and moisture-insulation shell behind the dew point temperature sensor 5.

In a third embodiment, as shown in fig. 2, the present invention provides a temperature and humidity measurement method for measuring temperature and humidity of an air dry bulb, including the following steps:

s1, measuring the temperature of the measured air at a preset flow rate to obtain a first measured temperature, namely the measured temperature;

s2, heating the air to be detected, and reducing the relative humidity of the air to be detected;

s3, improving the temperature uniformity of the detected air dry bulb;

s4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;

and S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature, and taking the initial relative humidity as the humidity obtained by the measuring device.

In a fourth embodiment, the present invention provides a temperature and humidity measurement method for measuring temperature and humidity of an air dry bulb, including the following steps:

s1, measuring the temperature of the air to be measured at a flow velocity of more than or equal to 3m/S to obtain a first measured temperature, namely the measured temperature;

s2, heating the air to be detected to reduce the relative humidity of the air to be detected by 10% RH;

s3, the uniformity of the temperature of the air dry balls to be detected is improved to be better than 0.1 ℃, namely the temperature difference between the air dry balls is less than 0.1 ℃.

S4, measuring the temperature and the relative humidity of the measured air dry bulb, and calculating to obtain the dew point temperature;

wherein, the measurement accuracy of the temperature is better than +/-0.1 ℃, and the measurement accuracy of the relative humidity is better than +/-2% RH.

And S5, calculating the initial relative humidity of the measured air according to the dew point temperature and the first measured temperature, and taking the initial relative humidity as the humidity obtained by the measuring device.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.