CN220287880U - Energy-saving control system of refrigeration house evaporation system - Google Patents
Energy-saving control system of refrigeration house evaporation system Download PDFInfo
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- CN220287880U CN220287880U CN202321780354.3U CN202321780354U CN220287880U CN 220287880 U CN220287880 U CN 220287880U CN 202321780354 U CN202321780354 U CN 202321780354U CN 220287880 U CN220287880 U CN 220287880U
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 63
- 238000001704 evaporation Methods 0.000 title claims abstract description 60
- 230000008020 evaporation Effects 0.000 title claims abstract description 51
- 238000010257 thawing Methods 0.000 claims abstract description 93
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 10
- 239000003507 refrigerant Substances 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000009834 vaporization Methods 0.000 claims 1
- 230000008016 vaporization Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The embodiment of the utility model discloses an energy-saving control system of a refrigeration house evaporation system, which comprises a compressor, a compressor control unit, a condenser, an evaporator, an air cooler control unit, a liquid supply pipe, an air return pipe, a heat medium pipe, a frequency converter and a plurality of indoor temperature sensors for detecting the temperature in the refrigeration house, wherein a defrosting electric valve is correspondingly arranged on the heat medium pipe, the air cooler control unit is in communication with the compressor control unit, the defrosting electric valve and the indoor temperature sensors, a pressure sensor and a temperature sensor A are arranged at the inlet of the compressor corresponding to the air return pipe, and the pressure sensor and the temperature sensor A are connected with the compressor control unit. According to the utility model, the switching of defrosting and refrigerating modes can be judged and accurately controlled according to the running power of the fan under the unified power frequency, and the opening of the electronic expansion valve is controlled and regulated through the superheat degree, so that the energy-saving and high-efficiency running of the refrigeration house evaporating system is realized.
Description
Technical Field
The utility model relates to the technical field of refrigeration of a refrigeration house, in particular to an energy-saving control system of an evaporation system of the refrigeration house.
Background
The energy consumption of the refrigeration system of the refrigeration house accounts for a large proportion of the total energy consumption of the buildings in China. The evaporator is a core refrigeration device in a refrigeration house refrigeration system. In the in-service use, the continuous outwards release air conditioning of evaporimeter body, after using a period, the frost phenomenon can appear in the refrigeration pipe wall, and the heat transfer resistance increases when the frost condenses to be thicker, leads to the circulation of air unsmooth, has reduced heat exchange efficiency, influences refrigeration effect. Therefore, the adoption of a scientific and effective defrosting method for precisely controlling the refrigeration house evaporation system is particularly important for saving energy of the refrigeration house evaporation system.
The existing defrosting modes comprise manual defrosting, hot defrosting of a refrigerant, defrosting of water, electric heating defrosting, combined defrosting of hot refrigerant gas and water and the like, however, the defrosting methods have no accurate control on defrosting time, and the fluctuation of the temperature of a cold store can cause the overall operation efficiency to be low. Some refrigerator evaporator defrosting technologies judge whether to start defrosting or finish defrosting by comparing the real-time power value of the fan with the preset defrosting start power value or the preset defrosting finish power value in a fuzzy manner, however, the fan frequency conversion operation in the defrosting process causes the power judgment standard to be non-uniform. Most energy-saving control of the refrigeration system is focused on defrosting operation of the evaporator, and monitoring of indoor air supply temperature is omitted, so that the control accuracy of the refrigeration system is low. In addition, the evaporating temperature of the refrigerating system is a fixed value, and the evaporating temperature is not adjusted, so that the refrigerating effect of the system is poor. The superheat degree of the evaporator is poorly controlled, so that the evaporator system control device cannot accurately regulate the flow of the refrigerant, and the energy consumption of the refrigeration system is affected.
Therefore, it is necessary to establish a unified judgment standard for switching between the defrosting mode and the refrigerating mode, and propose an accurate control method for comprehensively considering each component and parameter of the refrigerating system, so as to improve the control precision of the refrigerating evaporation system and enable the refrigerating evaporation system to operate in an energy-saving and efficient manner.
Disclosure of Invention
The technical problem to be solved by the embodiment of the utility model is to provide an energy-saving control system of a refrigeration house evaporation system, which is used for improving the control precision of the refrigeration system and realizing the energy-saving and efficient operation of the refrigeration house evaporation system by monitoring the indoor air supply temperature.
In order to solve the technical problems, the embodiment of the utility model provides an energy-saving control system of a refrigeration house evaporation system, which comprises a compressor, a compressor control unit, a condenser, an evaporator, an air cooler control unit, a liquid supply pipe, an air return pipe, a heat medium pipe and a frequency converter, wherein the evaporator comprises a plurality of air coolers, the air coolers of the evaporator are connected with the compressor through the air return pipe, the condenser is connected with the air coolers of the evaporator through the liquid supply pipe, the compressor control unit is communicated with the compressor, the frequency converter air cooler control unit is communicated with the air coolers through the frequency converter, the air coolers are communicated with the heat medium pipe, the heat medium pipe is correspondingly provided with a defrosting electric valve, the air cooler control unit is communicated with the compressor control unit, the defrosting electric valve and the indoor temperature sensor, and the pressure sensor and the temperature sensor A are arranged at the inlet of the air return pipe corresponding to the compressor, and the pressure sensor and the temperature sensor A are connected with the compressor control unit.
Further, a temperature sensor B and a temperature sensor C are respectively installed at the inlet pipe and the outlet pipe of the evaporator, an electronic expansion valve is arranged at the pipe orifice of the air cooler of the evaporator corresponding to the liquid supply pipe, the electronic expansion valve is connected with the air cooler control unit, the temperature sensor B and the temperature sensor C, and the air cooler control unit adjusts the flow of the refrigerant flowing into the air cooler of the evaporator by adjusting the opening of the electronic expansion valve.
Further, the indoor temperature sensors are uniformly distributed at the position of 40% -60% of the net height of the refrigeration house.
Further, the compressor control unit comprises a 1-path RS-485 interface and a ROLA host, the air cooler control unit comprises a 1-path RS-485 interface and a ROLA slave, and the air cooler control unit is in communication butt joint with the compressor control unit through the RS-485 interface so as to realize real-time monitoring and remote automatic control.
The beneficial effects of the utility model are as follows:
according to the utility model, the operation power of the air cooler is judged at the power frequency of 50 and Hz, the judgment standard is uniform, and the switching of the defrosting mode and the refrigerating mode is accurately controlled;
according to the utility model, according to the temperature feedback through the temperature sensor B and the temperature sensor C, the opening of the electronic expansion valve is controlled and changed through the superheat degree, the flow rate of the refrigerant and the air supply temperature are regulated, and the temperature fluctuation of a cold store and the energy consumption of a system are reduced;
the utility model has high control precision, and enables the refrigeration house evaporation system to operate energy-saving and high-efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an energy-saving control system of a refrigerator evaporation system according to an embodiment of the present utility model.
Fig. 2 is a schematic view showing an arrangement of an indoor temperature sensor according to an embodiment of the present utility model.
Fig. 3 is a flow chart of a cascade control of indoor temperature and supply air temperature employed in an embodiment of the present utility model.
Fig. 4 is a diagram showing an evaporation temperature adjustment step of the compressor according to the embodiment of the present utility model under a corresponding refrigeration condition (non-defrosting).
Fig. 5 is a defrosting flow chart of an energy-saving control system of a refrigerator evaporation system according to an embodiment of the present utility model.
Description of the reference numerals
Compressor 101, condenser 102, compressor control unit 103, air cooler control unit 104, freezer 105, air cooler 106, pressure sensor 201, temperature sensor A202, temperature sensor B203, temperature sensor C204, frequency converter 205, indoor temperature sensor 206, RS-485 interface 301, ROLA host 302, RS-485 interface 303, ROLA slave 304, electronic expansion valve 401, defrosting electric valve 402, air return pipe 501, liquid supply pipe 502, and heating medium pipe 503.
Detailed Description
It should be noted that, without conflict, the embodiments and features of the embodiments in the present application may be combined with each other, and the present utility model will be further described in detail with reference to the drawings and the specific embodiments.
In the embodiment of the present utility model, if there is a directional indication (such as up, down, left, right, front, and rear … …) only for explaining the relative positional relationship, movement condition, etc. between the components in a specific posture (as shown in the drawings), if the specific posture is changed, the directional indication is correspondingly changed.
In addition, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, the energy-saving control system of the refrigeration house evaporation system according to the embodiment of the utility model includes a compressor, a compressor control unit 103, a condenser 102, an evaporator, an air cooler control unit 104, a liquid supply pipe 502, an air return pipe 501, a heat medium pipe 503, a frequency converter 205, a refrigeration house, and an indoor temperature sensor 206.
The compressor is provided with a control system and is connected with the condenser.
The compressor control unit comprises a 1-path RS-485 interface and a ROLA host, and is in communication butt joint with a self-contained control system of the compressor.
The condenser is connected with air coolers of the evaporator through liquid supply pipes, and each air cooler is connected with the air cooler control unit through a frequency converter.
And one air cooler frequency converter is provided with a plurality of fans.
The liquid supply pipe orifice of the air cooler of the evaporator is provided with an electronic expansion valve, and the electronic expansion valve is connected with the air cooler control unit and used for adjusting the flow of the refrigerant flowing into the refrigeration house evaporator system.
The inlet pipe and the outlet pipe of the evaporator are respectively provided with a temperature sensor B and a temperature sensor C, the temperature sensor B and the temperature sensor C are connected with the air cooler control unit, and the opening of the electronic expansion valve is adjusted by controlling the evaporation superheat degree set value.
The air cooler is connected with the compressor through an air return pipe, a pressure sensor and a temperature sensor A are arranged at an inlet of the air return pipe of the compressor, and the pressure sensor and the temperature sensor A are connected with the compressor control unit.
And defrosting media of an energy-saving control system of the refrigeration house evaporation system pass through each air cooler of the evaporator and pass through a heating medium pipe, a defrosting electric valve is arranged on the heating medium water supply pipe, and the air cooler control unit controls starting and stopping of a defrosting program through the defrosting electric valve.
The air cooler control unit comprises a 1-path RS-485 interface and an ROLA slave, and is in communication butt joint with the compressor control unit through the RS-485 interface so as to realize real-time monitoring and remote automatic control.
According to the utility model, 9 indoor temperature sensors which are uniformly distributed are arranged at the position of 40% -60% of the net height of the refrigeration house, and the air supply temperature is controlled in cascade according to the superheat degree.
The superheat cascade control method of the indoor temperature and the air supply temperature of the energy-saving control system of the refrigeration house evaporation system comprises the following steps:
1) And measuring 9 indoor temperatures which are uniformly distributed at the position of 40% -60% of the net height of the refrigeration house, and taking an average value of the temperatures.
2) The air cooler control unit adjusts the operating frequency of the evaporator air cooler by comparing the measured indoor temperature with an indoor temperature set value.
3) And controlling the air supply temperature set value according to the deviation between the actual superheat value and the set value of the evaporator.
4) And comparing the air supply temperature set value with the air supply temperature actual value to adjust the opening of the electronic expansion valve.
In the energy-saving control system of the refrigeration house evaporation system, the evaporation pressure of the compressor under the corresponding refrigeration working condition (non-defrosting) is adjusted according to the opening degree and the quantity of the electronic expansion valves.
The utility model relates to an evaporation temperature adjustment of a compressor of an energy-saving control system of a refrigeration house evaporation system under a corresponding refrigeration working condition (non-defrosting), which comprises the following steps:
1) And detecting the number of the electronic expansion valves, and counting the number M of the electronic expansion valves with the opening degree of more than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor.
2) Judging whether M is less than 40%, if M is less than 40%, increasing the evaporating pressure by 30 kPa, and circularly judging every 10 minutes, otherwise judging whether M is less than 50%.
3) If M is less than 50%, the evaporation pressure is increased by 20 kPa, and whether M is less than 50% is judged every 10 minutes in a circulating way, otherwise whether M is less than 70% is continuously judged.
4) If M is less than 70%, the evaporation pressure is increased by 10 kPa, and whether M is less than 70% is judged every 10 minutes in a circulating way, otherwise whether M is less than 90% is continuously judged.
5) If M is less than 90%, the evaporating pressure is maintained, and whether M is less than 90% is judged every 10 minutes of circulation, otherwise, the evaporating pressure is reduced by 5 kPa, and whether M is less than 90% is judged every 10 minutes of circulation.
In the energy-saving control system of the refrigeration house evaporation system, when the number of the electronic expansion valves with the opening degree being more than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor is less than 70%, the evaporation pressure set value of the corresponding compressor is increased.
In the energy-saving control system of the refrigeration house evaporation system, the start and stop of the defrosting program are judged according to the running power of the fan when the power frequency is 50 Hz through the power test function of the frequency converter.
The defrosting function adopted by the energy-saving control system of the refrigeration house evaporation system comprises the following control steps:
1) Measuring the running power of the air cooler at 50 Hz through the power test function of the frequency converterP Blower fan 。
2) Comparing the running power of the air coolerP Blower fan And a defrosting start power set pointP Defrosting start And judging whether to start the defrosting program.
3) When (when)P Blower fan Not lower thanP Defrosting start When the working condition is non-defrosting working condition, the air cooler 50 Hz is restored to operate 10 s every half an hour, the operating power of 50 Hz is recorded, and the step 2) is repeated; when (when)P Blower fan < P Defrosting start When the evaporator is seriously blocked by frost, the resistance increases and the power decreases, at the moment, the defrosting program is started, the electronic expansion valve is closed, the defrosting electric valve is fully opened, and the air cooler is closed.
4) The operation of the air cooler 50 Hz is recovered for 10 s every 10 min during defrosting, and the operation power of 50 Hz is recordedP Blower fan 。
5) Comparing the running power of the air coolerP Blower fan Defrosting stop power set pointP Defrosting stop And judging whether to stop the defrosting process.
6) When (when)P Blower fan > P Defrosting stop And (3) closing the defrosting function, recovering the refrigerating function, and otherwise, repeating the steps 4) to 5).
The energy-saving control system of the refrigeration house evaporation system can judge and accurately control the switching of defrosting and refrigerating modes according to the running power of the fan under the unified power frequency, and the opening of the electronic expansion valve is controlled and regulated through the superheat degree, so that the energy-saving and high-efficiency operation of the refrigeration house evaporation system is realized.
Example 1
Referring to fig. 1, the energy-saving control system of the refrigerator evaporation system according to the embodiment of the present utility model includes a compressor 101, a compressor control unit 103, an air cooler 106, an air cooler control unit 103, a condenser 102, and a refrigerator 105. Wherein,
the compressor 101 is provided with a control system, is connected with the condenser 102, and the compressor control unit 103 comprises a 1-path RS-485 interface 301 and a ROLA host 302 and is in communication butt joint with the control system of the compressor 101. The condenser 102 is also connected with air coolers 106 of the evaporator through liquid supply pipes 502, each air cooler 106 is connected with the air cooler control unit 104 through a frequency converter 205, and the air cooler frequency converter 205 is provided with a plurality of fans. The number of air coolers 106 in the energy-saving control system of the refrigeration house evaporation system can be multiple, and in this embodiment, a connection of one air cooler 106 is taken as an example for illustration. In addition, an air cooler liquid supply pipe orifice 502 of the evaporator is provided with an electronic expansion valve 401, and the electronic expansion valve 401 is connected with the air cooler control unit 104 and is used for adjusting the flow of the refrigerant flowing into the refrigeration house evaporator system. The temperature sensor B203 and the temperature sensor C204 are respectively arranged on the inlet pipe and the outlet pipe of the evaporator, the two temperature sensors are connected with the air cooler control unit 104, the superheat degree is calculated through the temperature difference between the inlet pipe and the outlet pipe of the evaporator, the set value of the superheat degree of evaporation is controlled, the opening of the electronic expansion valve is adjusted, the flow rate of the refrigerant flowing into the evaporator system can be changed, the accurate liquid supply amount adjustment is realized, and the heat exchange efficiency of the evaporator is improved. The air cooler 106 is also connected with the compressor 101 through an air return pipe 501, the air return pipe inlet of the compressor 101 is provided with a pressure sensor 201 and a temperature sensor A202, and the pressure sensor 201 and the temperature sensor A202 are both connected with the compressor control unit 103. The defrosting medium enters and exits each air cooler 106 of the evaporator through a heating medium pipe 503, a defrosting electric valve 402 is arranged on a heating medium water supply pipe, and the air cooler control unit 104 can control the start and stop of a defrosting program through the defrosting electric valve 402. The air cooler control unit 104 is provided with a 1-path RS-485 interface 303 and an ROLA slave 104, and can be in communication butt joint with the compressor control unit 103 through the RS-485 interface so as to realize real-time monitoring and remote automatic control.
Example 2
The refrigeration house of the energy-saving control system of the refrigeration house evaporation system is provided with the indoor temperature sensor, the indoor temperature measuring points are arranged in a mode shown in figure 2, and 9 indoor temperature measuring points are uniformly distributed at the position of 40% -60% of the net height of the refrigeration house. The cascade control flow of the indoor temperature and the air supply temperature is shown in fig. 3, firstly, the indoor temperature is equal to the average value of 9 measuring points uniformly distributed at the position of 40% -60% of the net height of the refrigeration house, and then the air cooler control unit adjusts the running frequency of the evaporator air cooler in real time by comparing the measured indoor temperature with the indoor temperature set value PID. Meanwhile, the air supply temperature is controlled in cascade according to the superheat degree, specifically, the air supply temperature set value is controlled according to the deviation between the actual superheat degree value and the set value of the evaporator, and then the opening of the electronic expansion valve is adjusted by comparing the air supply temperature set value with the actual air supply temperature value. And the control precision of the refrigerating system is finally improved through real-time adjustment of the indoor temperature and the air supply temperature.
Example 3
Referring to fig. 4, the energy-saving control system of the refrigeration house evaporation system according to the embodiment of the utility model adjusts the evaporation temperature of the compressor under the corresponding refrigeration working condition (non-defrosting). The evaporation temperature adjusting and regulating steps adopted by the utility model comprise:
1) And detecting the number of the electronic expansion valves, and counting the number M of the electronic expansion valves with the opening degree of more than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor.
2) Judging whether M is less than 40%, if M is less than 40%, increasing the evaporating pressure by 30 kPa, and circularly judging every 10 minutes, otherwise judging whether M is less than 50%.
3) If M is less than 50%, the evaporation pressure is increased by 20 kPa, and whether M is less than 50% is judged every 10 minutes in a circulating way, otherwise whether M is less than 70% is continuously judged.
4) If M is less than 70%, the evaporation pressure is increased by 10 kPa, and whether M is less than 70% is judged every 10 minutes in a circulating way, otherwise whether M is less than 90% is continuously judged.
5) If M is less than 90%, the evaporating pressure is maintained, and whether M is less than 90% is judged every 10 minutes of circulation, otherwise, the evaporating pressure is reduced by 5 kPa, and whether M is less than 90% is judged every 10 minutes of circulation.
In a specific embodiment, firstly, the number of electronic expansion valves is detected, the number M of electronic expansion valves with the opening degree larger than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor is counted, and then the evaporation pressure is regulated in a partitioning mode according to the counted M value so as to change the evaporation temperature. Specifically, when the electronic expansion valve number M with the opening degree of more than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor is less than 40%, the evaporation pressure is increased by 30 kPa, and it is circularly judged whether the electronic expansion valve number M with the opening degree of more than or equal to 70% is less than 40% every 10 minutes until the electronic expansion valve number M with the opening degree of more than or equal to 40% is more than 50%, when the electronic expansion valve number M with the opening degree of more than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor is less than 50%, the evaporation pressure is increased by 20 kPa, and it is circularly judged whether the electronic expansion valve number M with the opening degree of more than or equal to 70% is less than 70% every 10 minutes until the electronic expansion valve number M with the opening degree of more than or equal to 70% is still less than 50%, and it is circularly judged whether the electronic expansion valve number M with the opening degree of more than or equal to 70% is still less than 70% every 10 minutes. When the number of the electronic expansion valves with the opening degree of more than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor is 70% -90%, the evaporation pressure is maintained, and whether M is less than 90% or not is judged in a circulating way every 10 minutes, when the number of the electronic expansion valves with the opening degree of more than or equal to 70% under the corresponding refrigeration working condition (non-defrosting) of the compressor is more than 90%, the evaporation pressure is reduced by 5 kPa, whether M is less than 90% or not is judged in a circulating way every 10 minutes, and the operation is repeated.
Example 4
Referring to fig. 5, the defrosting function adopted by the energy-saving control system of the refrigeration house evaporation system according to the embodiment of the utility model comprises the following control steps:
1) Measuring the running power of the air cooler at 50 Hz through the power test function of the frequency converterP Blower fan 。
2) Comparing the running power of the air coolerP Blower fan And a defrosting start power set pointP Defrosting start And judging whether to start the defrosting program.
3) When (when)P Blower fan Not lower thanP Defrosting start When the working condition is non-defrosting working condition, the air cooler 50 Hz is restored to operate 10 s every half an hour, the operating power of 50 Hz is recorded, and the step 2) is repeated; when (when)P Blower fan < P Defrosting openerDynamic movement When the evaporator is seriously blocked by frost, the resistance increases and the power decreases, at the moment, the defrosting program is started, the electronic expansion valve is closed, the defrosting electric valve is fully opened, and the air cooler is closed.
4) The operation of the air cooler 50 Hz is recovered for 10 s every 10 min during defrosting, and the operation power of 50 Hz is recordedP Blower fan 。
5) Comparing the running power of the air coolerP Blower fan Defrosting stop power set pointP Defrosting stop And judging whether to stop the defrosting process.
6) When (when)P Blower fan > P Defrosting stop And (3) closing the defrosting function, recovering the refrigerating function, and otherwise, repeating the steps 4) to 5).
In a specific embodiment, the operating power of the air cooler 106 at 50 Hz is first measured by the power test function of the frequency converter 205 itselfP Blower fan And is matched with a defrosting starting power set valueP Defrosting start And (3) comparing the sizes of the energy-saving control systems of the refrigeration house evaporation systems to judge whether the defrosting program needs to be started or not. When (when)P Blower fan Not lower thanP Defrosting start I.e. when the defrosting is not working, the air cooler 106 is restored to operate 10 s at the frequency of 50 Hz at half an hour intervals, and the operating power of the air cooler 106 at 50 Hz is recorded untilP Blower fan Lower than the defrosting starting power set valueP Defrosting start When the evaporator is seriously blocked by frost, the resistance increases and the power decreases, at the moment, the defrosting program is started, the electronic expansion valve 401 is closed, the defrosting electric valve 402 is fully opened, and the air cooler 106 is closed. The operation of the air cooler 106 at a frequency of 50 Hz was resumed 10 s every 10 min during defrosting and the air cooler operating power at 50 Hz was recordedP Blower fan . Comparing the operating power of the air cooler 106P Blower fan Defrosting stop power set pointP Defrosting stop And judging whether to stop the defrosting process. When the air cooler operates at powerP Blower fan Higher than the defrosting stop power set valueP Defrosting stop When the defrosting function is closed, the refrigerating function is recovered, otherwise, the defrosting function is heavyRecovering the operation of the air cooler 106 at the frequency of 50 Hz for 10 s every 10 min, and comparing the operation power of the air cooler 106P Blower fan Defrosting stop power set pointP Defrosting stop Up to the operating power of the air coolerP Blower fan Higher than the defrosting stop power set valueP Defrosting stop And when the defrosting function is closed, the defrosting mode is ended, and the refrigerating function is recovered.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.
Claims (4)
1. The utility model provides an energy-saving control system of freezer vaporization system, includes compressor, compressor control unit, condenser, evaporimeter, air-cooler control unit, liquid supply pipe, muffler, heat medium pipe, converter, the evaporimeter includes many air-coolers, the air-cooler of evaporimeter passes through the muffler and is connected with the compressor, the air-cooler of evaporimeter is connected to the condenser through liquid supply pipe, compressor control unit and compressor connection communication, and converter air-cooler control unit passes through converter and air-cooler connection communication, the air-cooler switch-on heat medium pipe, its characterized in that, energy-saving control system still includes a plurality of indoor temperature sensor that are used for detecting the interior temperature of freezer, corresponds on the heat medium pipe to be equipped with defrosting motorised valve, air-cooler control unit and compressor control unit, defrosting motorised valve, indoor temperature sensor connection communication, the compressor corresponds the entrance of muffler and is equipped with pressure sensor and temperature sensor A, pressure sensor and temperature sensor A connect the compressor control unit.
2. The energy-saving control system of a refrigeration house evaporation system according to claim 1, wherein a temperature sensor B and a temperature sensor C are respectively installed at the inlet and outlet pipe of the evaporator, an electronic expansion valve is arranged at the pipe orifice of the air cooler of the evaporator corresponding to the liquid supply pipe, the electronic expansion valve is connected with the air cooler control unit, the temperature sensor B and the temperature sensor C, and the air cooler control unit adjusts the flow rate of the refrigerant flowing into the air cooler of the evaporator by adjusting the opening degree of the electronic expansion valve.
3. The energy saving control system of a freezer evaporation system as claimed in claim 1, wherein said indoor temperature sensors are uniformly distributed at a net height of the freezer of 40% -60%.
4. The energy saving control system of a refrigeration house evaporation system according to claim 1, wherein the compressor control unit comprises a 1-path RS-485 interface and a ropa host, the air cooler control unit comprises a 1-path RS-485 interface and a ropa slave, and the air cooler control unit is in communication butt joint with the compressor control unit through the RS-485 interface to realize real-time monitoring and remote automatic control.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321780354.3U CN220287880U (en) | 2023-07-07 | 2023-07-07 | Energy-saving control system of refrigeration house evaporation system |
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| CN202321780354.3U CN220287880U (en) | 2023-07-07 | 2023-07-07 | Energy-saving control system of refrigeration house evaporation system |
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