阅读说明：本技术 一种基于果蔬呼吸热量计算冷库果蔬储量的方法 (Method for calculating cold storage fruit and vegetable reserves based on fruit and vegetable respiration heat quantity ) 是由 罗予 罗孝贤 秦占东 揭育胜 高翔 卢海峰 余立群 于 2021-01-08 设计创作，主要内容包括：一种基于果蔬呼吸热量计算冷库果蔬储量的方法,根据冷库封闭储藏作业维持恒温状态的特性,确定冷库运转的热平衡状态时间点,然后根据构成冷库热平衡状态单位时间内的全部稳定热量因素制冷设备制冷量Q-冷、冷库的维护结构传入热量Q-1、冷库内风机发热量Q-2、冷库内置其它带功设备发热量Q-3以及冷库内果蔬呼吸热量Q-4,利用冷库热平衡状态下制冷设备制冷量Q-冷等于冷库的维护结构传入热量Q-1、冷库内风机发热量Q-2、冷库内置其它带功设备发热量Q-3以及冷库内果蔬呼吸热量Q-4总和的平衡关系,计算出冷库内果蔬呼吸热量Q-4,从而根据冷库内果蔬的单位质量呼吸热计算出冷库内的果蔬质量。有益效果在于计算过程简单方便准确,提高了物联网的信息化运行数据的准确性。(A method for calculating the storage quantity of fruit and vegetable in cold storage features that the constant-temp state of cold storage is maintained, the time point of thermal equilibrium state of cold storage is determined, and the refrigerating output Q of refrigerating unit is determined according to the stable heat in unit time Cold Maintenance structure of refrigeration house transfers heat quantity Q 1 And heat productivity Q of fan in refrigeration house 2 Other equipment with power Q arranged in the refrigeration house 3 And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house 4 Refrigerating equipment refrigerating capacity Q under the condition of utilizing heat balance of refrigeration house Cold Maintenance structure heat transfer quantity Q equal to refrigeration house 1 And heat productivity Q of fan in refrigeration house 2 Other equipment with power Q arranged in the refrigeration house 3 And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house 4 The total balance relation is calculated to calculate the heat absorption Q of the fruits and vegetables in the refrigeration house 4 According to the fruit and vegetable in the cold storageAnd calculating the quality of the fruits and vegetables in the cold storage according to the unit mass respiratory heat. The method has the advantages that the calculation process is simple, convenient and accurate, and the accuracy of the informatization operation data of the Internet of things is improved.)

1. A method for calculating the storage capacity of fruits and vegetables in a refrigeration house based on the respiration heat of the fruits and vegetables is characterized in that: the method comprises the following specific steps:

s1: monitoring the operation condition of the cold storage in a closed state, and determining that the temperature and the humidity in the cold storage are kept constant, the ambient temperature outside the cold storage is kept stable, and the power consumption D of a compressor of the refrigeration equipment in unit time_{Electric power}Keep stable, ensure that the refrigeration house is in a heat balance state at the unit time point, and ensure the refrigerating capacity Q of the refrigerating equipment in the unit time_ColdHeat Q transferred by enclosure structure equal to refrigeration house₁And heat productivity Q of motor in refrigeration house₂Other equipment with power Q arranged in the refrigeration house₃And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house₄The sum of (a);

s2: calculating the heat quantity Q transferred into the enclosure structure of the refrigeration house in unit time at the time point monitored in the step S1₁，Q₁＝K·F·a(T_w-T_n) T, wherein K is the heat transfer coefficient (W/square meter per square inch) of the enclosure structure of the refrigeration house, F is the heat transfer area (square meter per square meter) of the enclosure structure, a is the temperature difference correction coefficient of two sides of the enclosure structure of the refrigeration house, and T_wMeasuring temperature (unit ℃) for the outer side of the enclosure structure, T_nThe temperature (unit ℃) measured in a refrigeration house and t is the time (unit h);

s3: at the time point monitored in step S1, the amount of heat generation Q of the internal cooling fan per unit time is calculated₂，Q₂＝n·P_{Wind power}T, where n is the number of motors in the freezer, P_{Wind power}The power (unit kw) of a fan in the refrigeration house, and t is time (unit h);

s4: the heating value Q of other power-carrying equipment in the cooling box per unit time is calculated at the time point monitored in step S1₃，Q₃＝P_{Work (Gong)}T, wherein P_{Work (Gong)}The power (unit kw) of other equipment with power in the refrigeration house, and t is the time (unit h);

s5: calculating the refrigerating capacity Q of the refrigerating equipment in the refrigerator in unit time at the time point monitored in the step S1_Cold，Q_Cold＝D_{Electric power}ε, wherein D_{Electric power}The power consumption (unit kw.h) of a compression pump of the refrigeration house refrigeration equipment in unit time is shown, and epsilon is the refrigeration coefficient of a compressor of the refrigeration house refrigeration equipment;

s6: at the time point monitored in step S1, according to the refrigeratorHeat balance formula Q at unit time point_Cold＝Q₁+Q₂+Q₃+Q₄And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house at unit time point₄Calculating the storage capacity m of fruits and vegetables in the refrigeration house according to the m, q and tWherein q is the respiratory heat per unit mass (kJ/(kg. h)) of fruits and vegetables in the cold storage.

2. The method for calculating the storage capacity of fruits and vegetables in the refrigeration house based on the fruit and vegetable respiratory heat quantity according to claim 1, wherein the method comprises the following steps: q in said step S2₁Including heat Q transferred by the wall board of the refrigeration house_{Wall with a plurality of walls}Heat Q transferred from the top plate of the refrigeration house_{Top roof}Heat Q transferred from bottom plate of cold storage_Bottom，Q₁＝Q_{Wall with a plurality of walls}+Q_{Top roof}+Q_Bottom＝K_{Wall with a plurality of walls}·F_{Wall with a plurality of walls}·a_{Wall with a plurality of walls}(T_w-T_n)+K_{Top roof}·F_{Top roof}·a_{Top roof}(T_w-T_n)+K_Bottom·F_Bottom·a_Bottom(T_w-T_n) Wherein, K is_{Wall with a plurality of walls}、K_{Top roof}And K_BottomThe heat transfer coefficients (W/square meter) of the wall, the top plate and the bottom plate of the refrigeration house are F_{Wall with a plurality of walls}、F_{Top roof}And F_BottomThe heat transfer area (square meter per unit), a, of the wall plate, the top plate and the bottom plate structure of the refrigeration house_{Wall with a plurality of walls}、a_{Top roof}And a_BottomThe temperature difference correction coefficients of the two sides of the wall plate, the top plate and the bottom plate of the refrigeration house are respectively.

3. The method for calculating the storage capacity of the fruits and vegetables in the refrigeration house based on the fruit and vegetable respiratory heat quantity according to claim 2, wherein the method comprises the following steps: said K_{Wall with a plurality of walls}、K_{Top roof}、K_BottomAnd a_{Wall with a plurality of walls}、a_{Top roof}、a_BottomAre constant values determined from the wall, ceiling and floor construction of the freezer.

4. The method for calculating the storage capacity of fruits and vegetables in the refrigeration house based on the fruit and vegetable respiratory heat quantity according to claim 1, wherein the method comprises the following steps: the other functional devices in the step S4 are functional devices that are arranged in the refrigerator and are used independently, such as lighting devices, monitoring devices and monitoring devices.

5. The method for calculating the storage capacity of fruits and vegetables in the refrigeration house based on the fruit and vegetable respiratory heat quantity according to claim 1, wherein the method comprises the following steps: and the unit mass respiratory heat q of the fruits and vegetables in the refrigeration house in the step S6 is selected according to the specific fruit and vegetable type reference GB/T15912.1-2009 in the refrigeration house.

Technical Field

The invention particularly relates to a technology for storing information in a refrigeration house.

Background

The use of the internet of things refrigeration house technology greatly improves the development of the fruit and vegetable industry. The existing internet of things refrigeration house monitoring system can monitor the use state of the refrigeration house in real time, and the monitored contents comprise the geographical position of the refrigeration house, the weather condition of the external environment, the types and the storage quantity of fruits and vegetables stored in the refrigeration house, the running temperature in the refrigeration house, the real-time power consumption condition of the refrigeration house and the like. The use information of the peasant household cold storage is integrated through the Internet of things, so that not only can the fruit and vegetable reserves of the peasant household be effectively supervised and counted, but also the fruit and vegetable market and the planting condition of the peasant household can be reasonably guided according to the supervision information, and the development of the fruit and vegetable industry is improved. However, in the actual operation process of the refrigeration house, the information of the type and the weight of the fruits and vegetables loaded in the refrigeration house is input by a farmer, part of refrigeration house users pay insufficient attention to the recording of the refrigeration house information, and the problems of omission and error recording often occur, especially the information input of the warehousing weight of the fruits and vegetables cannot timely feed correct information back to a terminal system, so that an internet of things system cannot obtain accurate information data.

The reason for causing the above-mentioned problem lies in, weigh inconvenient when the fruit vegetables are put in storage, peasant household often chooses not to weigh or estimate to lay because of weighing too troublesome, cause the fruit vegetables reserves information record in the freezer to be unclear. However, the cold storage information is particularly important for supervision and unified guidance and allocation of the terminal, and the information directly discounts the operation effect and significance of the internet of things.

Disclosure of Invention

The invention aims to solve the problem that the information of the fruit and vegetable reserves of the internet of things refrigerator is inaccurate, and provides a method for measuring and calculating the fruit and vegetable reserves in the refrigerator through the power consumption of a compressor of a refrigeration device in unit time under the stable operation state of the refrigerator.

In order to achieve the aim, the technical scheme adopted by the invention is that the thermal equilibrium state time point of the operation of the refrigeration house is determined according to the characteristic of maintaining the constant temperature state in the closed storage operation of the refrigeration house, and then the refrigerating capacity Q of the refrigerating equipment is determined according to all stable heat factors in unit time forming the thermal equilibrium state of the refrigeration house_ColdHeat transferred by enclosure structure of refrigeration house Q₁And heat productivity Q of fan in refrigeration house₂Other equipment with power Q arranged in the refrigeration house₃And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house₄Refrigerating equipment refrigerating capacity Q under the condition of utilizing heat balance of refrigeration house_ColdHeat Q transferred by enclosure structure equal to refrigeration house₁And heat productivity Q of fan in refrigeration house₂Other equipment with power Q arranged in the refrigeration house₃And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house₄The total balance relation is calculated to calculate the heat absorption Q of the fruits and vegetables in the refrigeration house₄Therefore, the quality of the fruits and vegetables in the cold storage can be calculated according to the unit mass respiratory heat of the fruits and vegetables in the cold storage.

The invention relates to a method for calculating the storage capacity of fruits and vegetables in a refrigeration house based on the respiration heat quantity of the fruits and vegetables, which comprises the following specific steps,

s1: monitoring the operation condition of the cold storage in a closed state, and determining that the temperature and the humidity in the cold storage are kept constant, the ambient temperature outside the cold storage is kept stable, and the power consumption D of a compressor of the refrigeration equipment in unit time_{Electric power}Keep stable, ensure that the refrigeration house is in a heat balance state at the unit time point, and ensure the refrigerating capacity Q of the refrigerating equipment in the unit time_ColdHeat Q transferred by enclosure structure equal to refrigeration house₁And heat productivity Q of motor in refrigeration house₂Other equipment with power Q arranged in the refrigeration house₃And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house₄The sum of (a);

s2: calculating the heat quantity Q transferred into the enclosure structure of the refrigeration house in unit time at the time point monitored in the step S1₁，Q₁＝K·F·a(T_w-T_n) T, wherein K is the heat transfer coefficient (W/square meter per square inch) of the enclosure structure of the refrigeration house, F is the heat transfer area (square meter per square meter) of the enclosure structure, a is the temperature difference correction coefficient of two sides of the enclosure structure of the refrigeration house, and T_wMeasuring temperature (unit ℃) for the outer side of the enclosure structure, T_nThe temperature (unit ℃) measured in a refrigeration house and t is the time (unit h);

s3: at the time point monitored in step S1, the amount of heat generation Q of the internal cooling fan per unit time is calculated₂，Q₂＝n·P_{Wind power}T, where n is the number of motors in the freezer, P_{Wind power}The power (unit kw) of a fan in the refrigeration house, and t is time (unit h);

s4: the heating value Q of other power-carrying equipment in the cooling box per unit time is calculated at the time point monitored in step S1₃，Q₃＝P_{Work (Gong)}T, wherein P_{Work (Gong)}The power (unit kw) of other equipment with power in the refrigeration house, and t is the time (unit h);

s5: calculating the refrigerating capacity Q of the refrigerating equipment in the refrigerator in unit time at the time point monitored in the step S1_Cold，Q_Cold＝D_{Electric power}ε, wherein D_{Electric power}The power consumption (unit kw.h) of a compression pump of the refrigeration house refrigeration equipment in unit time is shown, and epsilon is the refrigeration coefficient of a compressor of the refrigeration house refrigeration equipment;

s6: at the time point monitored in the step S1, according to the heat balance formula Q of the unit time point of the refrigeration house_Cold＝Q₁+Q₂+Q₃+Q₄And the heat absorption capacity Q of the fruits and vegetables in the refrigeration house at unit time point₄Calculating the storage capacity m of fruits and vegetables in the refrigeration house according to the m, q and tWherein q is the respiratory heat per unit mass (kJ/(kg. h)) of fruits and vegetables in the cold storage.

Q in said step S2₁Including heat Q transferred by the wall board of the refrigeration house_{Wall with a plurality of walls}Heat Q transferred from the top plate of the refrigeration house_{Top roof}Heat Q transferred from bottom plate of cold storage_Bottom，Q₁＝Q_{Wall with a plurality of walls}+Q_{Top roof}+Q_Bottom＝K_{Wall with a plurality of walls}·F_{Wall with a plurality of walls}·a_{Wall with a plurality of walls}(T_w-T_n)+K_{Top roof}·F_{Top roof}·a_{Top roof}(T_w-T_n)+K_Bottom·F_Bottom·a_Bottom(T_w-T_n) Wherein, K is_{Wall with a plurality of walls}、K_{Top roof}And K_BottomThe heat transfer coefficients (W/square meter) of the wall, the top plate and the bottom plate of the refrigeration house are F_{Wall with a plurality of walls}、F_{Top roof}And F_BottomThe heat transfer area (square meter per unit), a, of the wall plate, the top plate and the bottom plate structure of the refrigeration house_{Wall with a plurality of walls}、a_{Top roof}And a_BottomThe temperature difference correction coefficients of the two sides of the wall plate, the top plate and the bottom plate of the refrigeration house are respectively.

Said K_{Wall with a plurality of walls}、K_{Top roof}、K_BottomAnd a_{Wall with a plurality of walls}、a_{Top roof}、a_BottomAre constant values determined from the wall, ceiling and floor construction of the freezer.

The other functional devices in the step S4 are functional devices that are arranged in the refrigerator and are used independently, such as lighting devices, monitoring devices and monitoring devices.

And the unit mass respiratory heat q of the fruits and vegetables in the refrigeration house in the step S6 is selected according to the specific fruit and vegetable type reference GB/T15912.1-2009 in the refrigeration house.

The invention has the beneficial effects that: the performance operation of the refrigeration house is stable only to ensure, the time point of the refrigeration house in the heat balance state is monitored, the storage quantity of fruits and vegetables in the refrigeration house can be measured out according to the operation environment and state parameters of the refrigeration house through the power consumption of the refrigeration equipment compressor, the process is simple, convenient and accurate, and the accuracy of the information operation data of the Internet of things is improved.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail with reference to the embodiments.

The embodiment is an application process of the method for calculating the storage quantity of the fruits and vegetables in the refrigeration house based on the fruit and vegetable respiration heat quantity in the storage refrigeration house monitored by the Internet of things. The existing refrigeration house directly monitors specification parameters and equipment real-time operation data of the refrigeration house through an internet-of-things refrigeration house monitoring system, the potato storage refrigeration house used in the embodiment is 15m in length, 9m in height, an enclosure structure is made of a polyurethane foam composite plate structure, two variable frequency refrigeration machine equipment with the maximum rated power of 10.6kw are uniformly arranged on the refrigeration house body for refrigeration operation, and the refrigeration house body is provided with a plurality of variable frequency refrigeration machine equipment with the maximum rated power of 10.6kwThe system is provided with monitoring equipment for monitoring the temperature outside the warehouse, the temperature inside the warehouse, the humidity inside the warehouse and the operation parameters of the refrigeration equipment, and data monitoring and recording are carried out through terminal equipment. During the process of storing the potatoes, along with the refrigerating operation of the refrigerating machine equipment, the storage temperature T in the storehouse_nAfter the temperature reaches 0 ℃, the temperature is constantly maintained at 0 ℃ for a long time, at the moment, the change of the heat quantity in the cold storage reaches an equilibrium state, the method for calculating the storage quantity of the fruits and the vegetables in the cold storage based on the respiration heat quantity of the fruits and the vegetables can measure and calculate the storage quantity of the potatoes in the cold storage according to the operation parameters shown by the cold storage monitoring equipment, and the specific process is as follows:

s1: under the condition that the refrigeration house is in a closed operation state, according to monitoring data, the temperature in the refrigeration house is constantly kept at 0 ℃, under the condition that the temperature outside the refrigeration house is constantly kept, the power consumption of a compression pump of a refrigerating machine is always kept at a constant value in unit time (taking 1h as a unit), and the specific parameters of each operation device on the refrigeration house are as follows in the following table 1:

at the moment, the heat change in the refrigerator reaches a heat balance state, and the refrigerating capacity Q of the refrigerating equipment in unit time_ColdHeat transfer Q from the enclosure structure of the cold storage₁+ refrigeration house motor calorific value Q₂+ refrigeratory is internally provided with other equipment with power to generate heat Q₃+ heat absorption capacity of cold storage fruit and vegetable₄；

S2: the heat quantity Q transferred into the enclosure structure of the refrigeration house in unit time monitored in the step S1₁＝Q_{Wall with a plurality of walls}+Q_{Top roof}+Q_Bottom＝K_{Wall with a plurality of walls}·F_{Wall with a plurality of walls}·a_{Wall with a plurality of walls}(T_w-T_n)·t+K_{Top roof}·F_{Top roof}·a_{Top roof}(T_w-T_n)·t+K_Bottom·F_Bottom·a_Bottom(T_w-T_n) T, freezer enclosure parameters are as follows in table 2:

combining the data in table 1 and table 2, we find:

Q₁＝Q_{wall with a plurality of walls}+Q_{Top roof}+Q_Bottom＝K_{Wall with a plurality of walls}·F_{Wall with a plurality of walls}·a_{Wall with a plurality of walls}(T_w-T_n)·t+K_{Top roof}·F_{Top roof}·a_{Top roof}(T_w-T_n)·t+K_Bottom·F_Bottom·a_Bottom(T_w-T_n)·t＝(K_{Wall with a plurality of walls}·F_{Wall with a plurality of walls}·a_{Wall with a plurality of walls}+K_{Top roof}·F_{Top roof}·a_{Top roof}+K_Bottom·F_Bottom·a_Bottom)·(T_w-T_n)·t＝(0.25*36*1.35+0.25*36*1.35+0.25*59.2*1.35+0.25*59.2*1.35+0.25*135*1.35+0.345*135*0.2)*(20-0)*1＝2382.75W·h；

S3: the amount of heat Q generated by the motor in the refrigerator per unit time, which is monitored in step S1₂＝n·P_{Wind power}T, combined with the data in table 1, gives:

Q₂＝n·P_{wind power}·t＝4*550*1＝2200W·h；

S4: no other work equipment is arranged in the cold storage, so that other equipment with work Q with heat productivity is arranged in the cold storage₃＝0；

S5: the refrigerating capacity Q of the cold storage refrigerating device per unit time monitored in step S1_Cold＝D_{Electric power}ε.t, combined with the data in Table 1, gives:

Q_cold＝D_{Electric power}·ε＝1200*2*2.4*1＝5760W·h；

S6: the fruit and vegetable respiratory heat quantity Q in the unit time monitored in the step S1₄＝Q_Cold-Q₁-Q₂-Q₃Calculating data according to steps S2-S5 yields:

Q₄＝Q_cold-Q₁-Q₂-Q₃＝7200-2382.75-2200-0＝1177.25W·h；

The temperature in the refrigerator at the time point monitored in step S1 was 0 ℃, and the respiratory heat q parameter per unit mass of potatoes in GB/T15912.1-2009 is shown in table 3 below:

according to the heat absorption quantity Q of fruits and vegetables in the cold storage₄When m · q · t, 3600KJ/h is 1KW, the data in table 3 are combined to give:

about 62.9 tons.

In summary, during the period of storing fruits and vegetables in the refrigerator, when the temperature in the refrigerator is at a constant temperature for a long time and the external environment is relatively stable, according to the method for calculating the storage capacity of fruits and vegetables in the refrigerator, the storage capacity of fruits and vegetables in the refrigerator is calculated according to the specific parameters of the operation equipment of the refrigerator in the step S1 and by combining the respiratory heat per unit mass of the types of fruits and vegetables in the refrigerator at the temperature. In the process, under the condition that the refrigeration house is in a heat balance state, the heat Q is transferred into the refrigeration house enclosure structure in unit time₁And heat productivity Q of motor in refrigeration house₂And other devices with power Q arranged in the refrigeration house₃All are constant heat and refrigerating capacity Q of refrigerating equipment_ColdThe size of the heat absorption capacity of the refrigerator is only Q compared with the heat absorption capacity of fruits and vegetables in the refrigerator₄Is related to the size of the refrigerant, and the refrigerating capacity Q of the refrigerating equipment_ColdThe change of the size is realized by the power consumption D of the compression pump per unit time_{Electric power}The obtained heat capacity Q of the fruits and vegetables in the refrigeration house is breathed out₄The quantity of the fruits and vegetables m in the refrigeration house is determined, so that the storage quantity of the fruits and vegetables in the refrigeration house can be measured through the power consumption of the compressor of the refrigeration equipment according to the steps. The method for calculating the storage quantity of the fruits and vegetables in the refrigeration house based on the fruit and vegetable respiration heat quantity has the advantages that the correct storage quantity of the fruits and vegetables in the refrigeration house can be quickly calculated through the using operation parameters of the refrigeration house monitored by the Internet of things, so that the workload of a refrigeration house user for weighing the weight of the fruits and vegetables is reduced, the accuracy of the storage quantity data of the fruits and vegetables in the refrigeration house is ensured, and the defect that a farmer wrongly inputs information is overcome.