CN214307776U - Defrosting start-stop control device of indirect expansion refrigerating unit - Google Patents
Defrosting start-stop control device of indirect expansion refrigerating unit Download PDFInfo
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- CN214307776U CN214307776U CN202022715850.3U CN202022715850U CN214307776U CN 214307776 U CN214307776 U CN 214307776U CN 202022715850 U CN202022715850 U CN 202022715850U CN 214307776 U CN214307776 U CN 214307776U
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Abstract
The utility model discloses an indirect expansion refrigerating unit defrosting start-stop control device, which comprises a refrigerating unit main body and a refrigerating chamber, wherein a fan coil cooling end is arranged in the refrigerating chamber, the refrigerating unit main body is communicated with the fan coil cooling end through a secondary refrigerant pipeline and also comprises data processing equipment, an air inlet of the fan coil cooling end is provided with an air inlet temperature sensor, an air outlet is provided with an air outlet temperature sensor, and the air inlet temperature sensor, the air outlet temperature sensor and the refrigerating unit main body are electrically connected with the data processing equipment; and the data processing equipment controls the defrosting start and stop of the refrigerating unit according to the air inlet temperature and the air outlet temperature. The start-stop control device can accurately predict the frosting condition, obtain the optimal defrosting start-stop opportunity, improve the product quality of the existing refrigerating device, and realize energy conservation and emission reduction.
Description
Technical Field
The utility model belongs to the technical field of the refrigeration plant defrosting, concretely relates to indirect expansion refrigerating unit defrosting opens and stops controlling means.
Background
The rising of the adverse potential of the refrigeration cold chain industry during epidemic situations means that the importance is prominent at first, and the refrigeration cold chain industry is increasingly applied to transportation and storage of biology, medicines, fresh foods, food, chemical raw materials and the like and also provides important support for improving the living standard of people. As chiller units are used more and more, their refrigeration quality and energy consumption levels are of much greater concern.
The chiller units can transfer the cooling capacity in the evaporator to the coolant, which is pumped to the cooling terminals in the space to be cooled, where it is transferred to the space to be cooled. During operation of the unit, water vapor in the indoor air may freeze to form a frost layer on the surface of the end heat exchanger. If the frost cannot be melted in time, the heat exchange coefficient is reduced, the evaporation temperature is reduced, the system energy efficiency is reduced, and the refrigerating capacity is reduced; however, if the frost is melted too frequently, the energy consumption is increased, and the refrigerating temperature is increased. The existing system mostly adopts a timing defrosting method, which is easy to cause untimely defrosting or excessive defrosting. Therefore, how to determine the starting and ending time of defrosting becomes a research hotspot, and the method is also an important aspect for improving the product quality of the existing refrigerating device and realizing energy conservation and emission reduction.
Disclosure of Invention
The utility model provides a to prior art not enough, the utility model provides a refrigerating plant's thing networking defrosting opens and stops management method can obtain best defrosting and open and stop the opportunity, has promoted refrigerating plant's product quality, energy saving and emission reduction.
In order to achieve the purpose of the invention, the utility model adopts the following technical scheme:
the defrosting start-stop control device of the indirect expansion refrigerating unit comprises a refrigerating unit main body and a refrigerating chamber, wherein a fan coil cooling tail end is arranged in the refrigerating chamber, the refrigerating unit main body is communicated with the fan coil cooling tail end through a secondary refrigerant pipeline, the defrosting start-stop control device also comprises data processing equipment, an air inlet temperature sensor is arranged at an air inlet of the fan coil cooling tail end, an air outlet temperature sensor is arranged at an air outlet, and the air inlet temperature sensor, the air outlet temperature sensor and the refrigerating unit main body are electrically connected with the data processing equipment; and the data processing equipment controls the defrosting start and stop of the refrigerating unit according to the air inlet temperature and the air outlet temperature.
As one of the preferred schemes of the utility model, still include defrosting heating device, in defrosting heating device located fan coil cooling end, data processing equipment still opened according to opening of air inlet temperature, air-out temperature control defrosting heating device.
As one of the preferred schemes of the utility model, still include freezer state collection system for acquire the running state of storehouse, data processing equipment still links to each other with storehouse state collection system, and the defrosting that the control unit controlled refrigerating unit according to air inlet temperature, air-out temperature and storehouse running state opens and stops.
As one of the preferred schemes of the utility model, it stops the condition to be equipped with the threshold value and melt frost in the data processing equipment and predetermine, the threshold value is predetermine to melt frost includes air inlet temperature threshold value, the difference in temperature changes threshold value and air-out temperature threshold value, the start condition that melts frost is less than air inlet temperature threshold value for air inlet temperature, and business turn over wind difference in temperature change value is greater than the difference in temperature change threshold value, the freezer running state is normal, when fan coil cooling end air inlet temperature, when business turn over wind difference in temperature satisfies the start condition that melts frost, control refrigerating unit and/or defrosting heating device start-up and melt frost.
As one of the preferable schemes of the utility model, the defrosting stop condition is that the air outlet temperature is greater than the air outlet temperature threshold value; and when the air outlet temperature of the cooling end of the fan coil meets the defrosting condition, the data processing equipment controls the refrigerating unit and/or the defrosting heating device to stop defrosting.
As one of the preferred schemes of the utility model, the difference value that the difference in temperature variation value is initial difference in temperature and real-time difference in temperature, initial difference in temperature be after the defrosting last time, fan coil cooling end business turn over wind difference in temperature before the frost layer does not appear.
As one of the preferable schemes of the utility model, the air inlet temperature threshold value is the highest refrigeration temperature that needs defrosting on the surface of the evaporator.
As one of the preferable schemes of the utility model, the air inlet temperature sensor and the air outlet temperature sensor are arranged relatively
Compared with the prior art, the utility model, beneficial effect is: the thickness of a frost layer can be judged according to the temperature difference of inlet and outlet air at the cooling end of the fan coil, and the abnormal state is eliminated by combining the running state of a frozen facility, so that the optimal defrosting opportunity is obtained; judging defrosting stop time according to the air outlet temperature; finally, the product quality of the existing refrigerating device is improved, and energy conservation and emission reduction are realized.
Drawings
FIG. 1 is a schematic diagram of a defrosting start-stop control device of an indirect expansion refrigerating unit according to an embodiment;
FIG. 2 is a flow chart of the operation of the defrosting start-stop control device of the indirect expansion refrigerating unit according to the embodiment;
the reference numbers are 1, a refrigerating unit main body, 2 secondary refrigerant pipelines, 3, a fan coil cooling end, 4, an air inlet direction, 5, an air inlet temperature sensor, 6, an air outlet temperature sensor, 7, secondary refrigerant pipelines, 8, data processing equipment, 9, a freezing chamber, 10, a secondary refrigerant pump, 11, a defrosting heating device and 12, and a freezing chamber state acquisition device.
Detailed Description
The technical solution of the present invention will be further explained below.
As shown in fig. 1, the start and stop control device for defrosting of indirect expansion refrigerating unit comprises a refrigerating unit main body 1 and a freezing chamber 9, wherein a fan coil cooling end 3 is arranged in the freezing chamber 9, the refrigerating unit main body 1 is connected with the fan coil cooling end 3 through a secondary refrigerant pipeline 2/7, the start and stop control device further comprises a data processing device 8, an air inlet of the fan coil cooling end 3 is provided with an air inlet temperature sensor 5, an air outlet is provided with an air outlet temperature sensor 6, and the air inlet temperature sensor 5, the air outlet temperature sensor 6 and the refrigerating unit main body 1 are electrically connected with the data processing device 8; and the data processing equipment 8 controls the defrosting start and stop of the refrigerating unit according to the air inlet temperature and the air outlet temperature.
One side of storehouse/freezer 9 still is equipped with freezer state collection system 12 for acquire the running state of storehouse, and data processing equipment still links to each other with storehouse state collection system, and the control unit opens and stops according to the defrosting of air inlet temperature, air-out temperature and storehouse running state control refrigerating unit, leads to the mistake defrosting because of the business turn over goods of freezer, operations such as take a breath.
In order to further improve the defrosting effect, a defrosting heating device 11 can be installed in the cooling tail end, and the data processing device 8 also controls the start and stop of the defrosting heating device 11 according to the air inlet temperature and the air outlet temperature, so that the defrosting heating device and the defrosting unit work together, the defrosting time is shortened, and the defrosting efficiency is improved.
The data processing equipment 8 is internally provided with a defrosting preset threshold and a defrosting start-stop condition, the defrosting preset threshold comprises an air inlet temperature threshold, a temperature difference change threshold and an air outlet temperature threshold, the defrosting start condition is that the air inlet temperature is smaller than the air inlet temperature threshold, the air inlet and outlet temperature difference change value is larger than the temperature difference change threshold, the storehouse operation state is normal, and when the air inlet temperature and the air inlet and outlet temperature difference at the cooling end of the fan coil meet the defrosting start condition, the refrigerating unit and/or the defrosting heating device are controlled to start defrosting. The defrosting stop condition is that the air outlet temperature is greater than the air outlet temperature threshold value; and when the air outlet temperature of the cooling end of the fan coil meets the defrosting condition, the data processing equipment controls the refrigerating unit and/or the defrosting heating device to stop defrosting.
Defrosting opens and stops controlling means and carry out the during operation, the rationale is: the coolant is cooled in the refrigerating unit body 1, delivered to the end of the fan coil by the pump 10 to give off cooling energy to the space to be cooled, heated at the same time, and returned to the refrigerating unit 1 through the pipe 7 to be cooled again. Along with continuous operation, the frost layer begins to appear, which causes heat exchange to be poor, the cold quantity obtained by the air entering the tail end of the fan coil is reduced, the outlet air temperature is raised, namely the inlet and outlet air temperature difference is reduced compared with the frostless operation, and when the inlet and outlet air temperature difference is reduced to a given value, the frost layer reaches the thickness which needs to be defrosted. However, when the freezing chamber is not normally operated, such as opening a door to enter and exit goods, performing ventilation and the like, the temperature difference may be significantly changed due to the entry of external hot air, and thus, when the freezing chamber is not normally operated, defrosting is not performed. The data processing device 8 receives signals from the temperature sensor and the working state of the freezing chamber, performs comprehensive judgment, and transmits corresponding execution actions to the freezing unit 1 and the defrosting heating device 11. After the defrosting operation is carried out, the data processing device 8 receives the temperature of the air inlet sensor 5, when the temperature rises to a certain value, the frost layer is completely melted, the defrosting is finished, and the normal refrigeration operation is started.
As shown in FIG. 2, adopt the defrosting opens and stops controlling means and carry out the during operation, the operating procedure as follows:
the first step, after the last defrosting is finished and the operation is carried out for a certain time, the frost layer does not appear yet, and the temperature T of the inlet air and the outlet air at the moment is read1And T2And taking the temperature difference as the initial temperature difference delta T and storing.
And secondly, waiting for the refrigerating temperature to be reduced to the required temperature set by a user, and starting defrosting if the running time at the moment exceeds the set maximum defrosting interval time.
Thirdly, reading the air inlet and outlet temperature T of the cooling end of the fan coil1And T2And a freezer operating condition. If the inlet air temperature is greater than or equal to the highest refrigerating temperature (namely the set value T) to be defrosteda) If yes, defrosting is not carried out, the round of judgment is finished, and the system continues to refrigerate; otherwise, the next step is carried out.
The fourth step, the initial temperature difference Δ T and the current temperature difference (T)1-T2) Subtracting to obtain a temperature difference drop value, and if the temperature difference drop value is less than a set value TbThe frost layer is not thick enough and does not melt; or if the warehouse is not operating normally (such as the warehouse door is opened and the warehouse is in and out of goods, the warehouse is ventilating and the like) although delta T- (T)1-T2) May be greater than TbBut still not defrosting; the decision round is ended, and the system continues to cool. Only when Δ T- (T)1-T2) May be greater than TbAnd the storehouse normally operates, the defrosting mode is started.
The fifth step, after entering the defrosting mode, the air outlet temperature is read periodically, and when the air outlet temperature T is reached2Less than a set value TcWhen the frost melting is not complete, the frost melting is continued; when the outlet air temperature T2Greater than a set value TcAnd when the defrosting is finished, stopping defrosting, finishing the defrosting program and carrying out the next round of operation.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing has been a detailed description of the preferred embodiments and principles of the present invention, and it will be apparent to those skilled in the art that variations may be made in the specific embodiments based on the concepts of the present invention, and such variations are considered as within the scope of the present invention.
Claims (4)
1. The defrosting start-stop control device of the indirect expansion refrigerating unit comprises a refrigerating unit main body and a refrigerating chamber, wherein a fan coil cooling tail end is arranged in the refrigerating chamber, and the refrigerating unit main body is communicated with the fan coil cooling tail end through a secondary refrigerant pipeline; and the data processing equipment controls the defrosting start and stop of the refrigerating unit according to the air inlet temperature and the air outlet temperature.
2. The start-stop control device for defrosting of the indirect expansion refrigerating unit according to claim 1, further comprising a defrosting heating device, wherein the defrosting heating device is arranged in the cooling end of the fan coil, and the data processing device further controls the start-stop of the defrosting heating device according to the inlet air temperature and the outlet air temperature.
3. The start-stop control device for defrosting of the indirect expansion refrigerating unit according to claim 2, further comprising a freezing chamber state acquisition device for acquiring the operation state of the warehouse, the data processing device is further connected with the warehouse state acquisition device, and the control unit controls the start-stop of defrosting of the refrigerating unit according to the air inlet temperature, the air outlet temperature and the warehouse operation state.
4. The start-stop control device for defrosting of the indirect expansion refrigerating unit of claim 1, wherein the inlet air temperature sensor and the outlet air temperature sensor are arranged oppositely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022715850.3U CN214307776U (en) | 2020-11-20 | 2020-11-20 | Defrosting start-stop control device of indirect expansion refrigerating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022715850.3U CN214307776U (en) | 2020-11-20 | 2020-11-20 | Defrosting start-stop control device of indirect expansion refrigerating unit |
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| Publication Number | Publication Date |
|---|---|
| CN214307776U true CN214307776U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022715850.3U Active CN214307776U (en) | 2020-11-20 | 2020-11-20 | Defrosting start-stop control device of indirect expansion refrigerating unit |
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| CN (1) | CN214307776U (en) |
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- 2020-11-20 CN CN202022715850.3U patent/CN214307776U/en active Active
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