CN115823807B - Cold storage and cooling control method thereof - Google Patents
Cold storage and cooling control method thereof Download PDFInfo
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- CN115823807B CN115823807B CN202211296997.0A CN202211296997A CN115823807B CN 115823807 B CN115823807 B CN 115823807B CN 202211296997 A CN202211296997 A CN 202211296997A CN 115823807 B CN115823807 B CN 115823807B
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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 invention discloses a refrigeration house and a cooling control method thereof, comprising the following steps: s11, adjusting the opening of the electronic expansion valve of the storeroom according to the suction superheat degree of the electronic expansion valve; s12, adjusting the set value of the air suction superheat degree of the electronic expansion valve according to the unit shutdown time interval and the warehouse temperature rise rate; s13, adjusting the lower limit value of the temperature of the warehouse according to the shutdown time interval of the unit and the temperature drop rate of the warehouse. According to the starting and stopping conditions of the refrigeration house unit, the liquid supply electromagnetic valve of the refrigeration house, the superheat degree set value of the electronic expansion valve and the lower limit value of the refrigeration house temperature are sequentially adjusted according to the temperature rise rate and the temperature drop rate of the refrigeration house, so that the normal cooling of the refrigeration house is ensured, and the technical problems of frequent starting and stopping, power consumption increase, oil running and the like when the load is small are solved.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration house and a cooling control method thereof.
Background
The refrigeration house generally adopts a screw machine set to cool a plurality of houses. The temperature reduction speed of each warehouse is different due to the inconsistency of the size of the warehouse, the heat preservation condition, the substances stored in the warehouse and the like. And unloading and stopping the machine set when the temperature of the warehouse reaches the lower limit value of the set temperature, and starting the machine set to operate when the temperature of the warehouse is recovered to the upper limit value of the set temperature.
In actual engineering, the unit is generally selected according to full load, and when a single or fewer storehouses are actually operated or the load of the refrigerator is smaller, the phenomenon of a large horse-drawn trolley can occur. The long-term partial load operation of the unit can lead to lower air suction flow rate, and the oil at the tail end cannot be brought back into the unit through air suction, so that the problems of oil leakage and the like are caused, and the use of a user is influenced.
At present, a plurality of compressor sets connected in parallel are generally adopted to solve the above situation, and the throttled refrigerant enters a refrigeration house through a liquid supply electromagnetic valve and a thermal expansion valve and is cooled. However, if the usage rate of the refrigeration house is low, the goods are not fully loaded, the heat load is too small, even if the cooling capacity is still larger when a plurality of units are unloaded to the minimum load of a single compressor, the units can be stopped when the units are operated to the set temperature, if some refrigeration houses are not good in heat preservation condition and quick in temperature return, the units can be started again, so that the units are frequently started and stopped, and the power consumption is increased. In this case, it is necessary to control the refrigerator and the unit in combination.
Disclosure of Invention
The invention provides a refrigeration house and a cooling control method thereof, which are used for solving the technical problems that a parallel screw unit is easy to frequently start and stop, power consumption is increased and oil runs under the condition of small refrigeration house load.
The invention provides a cooling control method for a refrigerator, which comprises the following steps:
s11, adjusting the opening of the electronic expansion valve of the storeroom according to the suction superheat degree of the electronic expansion valve;
s12, adjusting the set value of the air suction superheat degree of the electronic expansion valve according to the unit shutdown time interval and the warehouse temperature rise rate;
s13, adjusting the lower limit value of the temperature of the warehouse according to the shutdown time interval of the unit and the temperature drop rate of the warehouse.
Preferably, the step 12 includes: and when the shutdown time interval of the unit is detected to be smaller than the set shortest shutdown time three times continuously, comparing the temperature rise rates of all the storehouses, and reducing the superheat degree set value of the electronic expansion valve of the storehouses with the smallest temperature rise rate.
The temperature rise rate is the absolute value of the difference between the current warehouse temperature and the previous minute warehouse temperature.
And the value of the superheat degree set value of the electronic expansion valve is S1, and the lowest value of the superheat degree set value is greater than or equal to the value S.
In one embodiment, the value S1 is 0.5 and the value S is 2.
Preferably, the step S13 includes: when the set value of the suction superheat degree of all the storehouses is adjusted to the minimum value S, the temperature drop rate of all the storehouses is compared and the lower limit value of the storehouses with the minimum temperature drop rate is adjusted when the set shutdown time interval is continuously detected for three times to be smaller than the set shortest shutdown time interval.
The temperature drop rate is the absolute value of the difference between the previous minute of the stock temperature and the current stock temperature.
The cooling control method of the refrigerator further comprises the following steps of S10, setting target temperature of the refrigerator, and opening a liquid supply electromagnetic valve SVn of the refrigerator when the temperature of the refrigerator is greater than the sum of the target temperature and tolerance; when the temperature of the reservoir is less than the difference between the target temperature and the tolerance, the liquid supply solenoid valve SVn of the reservoir is closed.
In an embodiment, the invention provides a cooling control method for a refrigerator, which comprises the following steps:
s10, setting a target temperature of a warehouse, and opening a liquid supply electromagnetic valve SVn of the warehouse when the temperature of the warehouse is greater than the sum of the target temperature and the tolerance; when the temperature of the storehouse is smaller than the difference between the target temperature and the tolerance, closing a liquid supply electromagnetic valve SVn of the storehouse;
s11, adjusting the opening of the electronic expansion valve of the storeroom according to the suction superheat degree of the electronic expansion valve;
s12, judging whether the shutdown time interval of the unit detected for three times continuously is smaller than the set shortest shutdown time, if not, maintaining the set value of the suction superheat degree unchanged; if yes, the superheat setting value of the warehouse electronic expansion valve with the minimum temperature rise rate is reduced;
S13, when the set values of the suction superheat degree of all the warehouse electronic expansion valves are adjusted to the minimum value S, judging whether the time interval for continuously detecting the shutdown of the unit for three times is smaller than the set minimum time, and if not, maintaining the set values of the suction superheat degree unchanged; if not, the lower limit value of the warehouse temperature with the minimum cooling rate is adjusted.
The invention also provides a refrigeration house, and the refrigeration house adopts the refrigeration house cooling control method.
Compared with the prior art, the invention has the following beneficial effects:
according to the start-stop condition of the refrigeration house unit, the temperature rise rate and the temperature drop rate of the refrigeration house are sequentially adjusted to sequentially adjust the liquid supply electromagnetic valve of the refrigeration house, the superheat degree set value of the electronic expansion valve and the lower limit value of the refrigeration house temperature, so that the normal cooling of the refrigeration house is ensured, and the technical problems of frequent start-stop, power consumption increase, oil running and the like, which are easy to occur, of the parallel screw unit for the refrigeration house with small load are solved.
Drawings
The invention will be described in detail below with reference to the attached drawing figures and specific examples, wherein:
FIG. 1 is a diagram of a refrigeration cycle of a freezer employing a parallel screw compressor unit;
fig. 2 is a flow chart of a cooling control method for a refrigerator according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are given by way of illustration only and are not intended to be limiting.
The refrigeration cycle of the refrigerator shown in fig. 1 includes n screw compressor units 10 connected in parallel, a condenser (not shown), a liquid reservoir 12, a liquid supply manifold 13, an evaporator 14 provided in each of the refrigerators, and a liquid return manifold 15. The liquid supply header 13 is communicated with the evaporators 14 in the respective storehouses through branches, and a liquid supply electromagnetic valve SVn and a liquid supply electronic expansion valve Vn are sequentially arranged on the branches. The return manifold 15 communicates with the outlets of the respective evaporators 14 via branches, on which return solenoid valves 16 are provided. Temperature sensors are arranged in each warehouse and on the corresponding return air pipeline. The suction manifold is provided with a pressure sensor.
The invention uses the electronic expansion valve to replace the on-off liquid supply electromagnetic valve and the thermal expansion valve to control in the refrigeration system, so that the temperature of the storeroom is better and more stable. The thermal expansion valve has a small adjusting range, a minimum steady-state superheat degree (MSS) exists, and when the actual superheat degree is smaller than the minimum steady-state superheat degree MSS, the system enters an unstable region, so that the superheat degree of the thermal expansion valve cannot be smaller than the minimum steady-state superheat degree, and the minimum steady-state superheat degree cannot be adjusted at any time and needs to be adjusted manually. The electronic expansion valve has the advantages of large adjusting range, high adjusting precision and no minimum steady-state superheat degree. When the thermal load of the refrigeration house is small, the superheat degree control value can be adjusted through a set program, the opening degree of the electronic expansion valve is increased, the mass flow of the refrigerant is improved, and therefore the frequent start and stop times of the compressor unit are reduced.
The refrigeration system of the refrigeration house shown in fig. 1 is a vapor compression type refrigeration system, high-temperature and high-pressure refrigerant vapor compressed by a compressor unit is sent to a condenser for cooling, and high-pressure medium-temperature liquid condensed after cooling enters a liquid storage device 12 for storage. When the temperature in the warehouse reaches the upper limit value of the set temperature, the liquid supply electromagnetic valve SVn corresponding to the warehouse is opened, and the refrigerant enters the evaporator 14 of the warehouse to absorb the heat emitted by the goods in the warehouse after being throttled by the electronic expansion valve Vn, so that the temperature in the warehouse is reduced; when the temperature in the refrigerator reaches the lower limit value of the set temperature, the corresponding liquid supply electromagnetic valve is closed, and the cooling supply to the refrigerator is stopped.
The cooling control method for the refrigeration house adjusts the cooling strategy of the refrigeration house according to the cooling condition of the refrigeration house and the start-stop condition of the unit.
The start and stop of the parallel screw compressor unit are controlled according to the suction pressure, and the suction pressure is measured by a pressure sensor on a suction manifold. When the load of the warehouse decreases and the evaporation amount of the refrigerant decreases, the suction pressure of the unit decreases, and at this time, the unit unloads the compressor, and the suction amount decreases, so that the suction pressure is maintained at the set value. When the compressor is unloaded to a minimum load, the compressor is shut down. All compressor shutdown opportunity sets are shutdown.
The cooling method of the refrigeration house provided by the invention comprises the following steps:
S10, setting a set value of a warehouse temperature as T Target object , setting a warehouse temperature tolerance as delta T, and setting a lower limit value of the warehouse temperature as T Lower limit of storehouse .
When the temperature of the storehouse 1 is greater than the sum of the target temperature and the tolerance, T1 is greater than T Target object +DeltaT, and a liquid supply electromagnetic valve SV1 of the storehouse 1 is opened; when the temperature of the warehouse 1 is less than the difference between the target temperature and the tolerance, T1 is less than T Target object -DeltaT, and the liquid supply electromagnetic valve SV1 of the warehouse 1 is closed.
The liquid supply solenoid valves SV2, … … SVn of the warehouse 2 … … n are opened and closed simultaneously with the liquid supply solenoid valve SV1.
And S11, controlling the opening degree of the electronic expansion valves V1 and V2 … … Vn according to the suction superheat degree.
The suction superheat SHn of the electronic expansion valve corresponding to the warehouse is calculated according to the following formula:
SHn = return air temperature TTn-evaporation temperature;
return air temperature: the temperature measured by the temperature sensor arranged on the air return pipeline of each warehouse is the air return temperature of the warehouse, for example, the air return temperature of the warehouse 1 is TT1, the air return temperature of the warehouse 2 is TT2 … …, and the air return temperature of the warehouse n is TTn.
The superheat degree deviation ekn of the electronic expansion valve corresponding to each warehouse is calculated according to the following formula:
ekn = superheat SHn-superheat set sh_exv;
Let the initial opening degree of the electronic expansion valve be fod_exv, and at the kth sampling period, the opening degree variation of the electronic expansion valve be Δuk (unit is%), calculated as follows:
Δuk=kp (e k-ek-1）+Kiek+Kd(ek-2ek-1+ek-2), wherein:
kp, ki, kd are coefficients;
ek, ek-1, e-2 is the superheat deviation of the k, k-1, k-2 sampling periods.
Opening degree of the electronic expansion valve=initial opening degree of the electronic expansion valve+opening degree variation amount=fod_exv+ +Δuk.
S12, adjusting the set value of the air suction superheat degree of the electronic expansion valve according to the unit shutdown time interval.
Let the shortest downtime of the parallel screw compressor group be t Shortest stop . When the shutdown time interval t of the unit is smaller than t Shortest stop which is detected three times in succession, the temperature rise rate of each warehouse is calculated: t Rate of temperature rise 1、T Rate of temperature rise 2, … …,
T Rate of temperature rise n, wherein the temperature rise rate is the absolute value of the difference between the current reservoir temperature and the previous minute reservoir temperature:
T Rate of temperature rise = | current bin temperature-previous minute bin Wen;
The superheat degree set value SH_EXV of the warehouse electronic expansion valve with the minimum temperature rise rate is regulated to SH_EXV-0.5, S is regulated to 0.5 each time, the superheat degree set value of the electronic expansion valve is required to be more than or equal to S in the embodiment, and S is more than or equal to 2 in the embodiment. If the superheat setting SH_EXV is too small, the unit has the risk of liquid carrying.
If the operation is carried out, and the shutdown time interval t of the unit is still continuously detected for three times to be less than t Shortest stop , the superheat degree set value SH_EXV of the electronic expansion valve of the storeroom with the minimum temperature rise rate is sequentially adjusted to SH_EXV-0.5, namely, the superheat degree set value is adjusted to be smaller than 0.5 each time, and S is more than or equal to S, wherein S is more than or equal to 2.
S13, when the set values of the suction superheat degree of all the warehouse electronic expansion valves are adjusted to the minimum value S, the temperature lower limit value of the warehouse with the minimum temperature drop rate is adjusted when the shutdown time interval t of the unit is smaller than t Shortest stop continuously detected three times.
Calculating the temperature drop rate T Rate of temperature drop 1、T Rate of temperature drop 2 and T Rate of temperature drop n, of each warehouse, and setting the lower limit value of the warehouse temperature with the minimum temperature drop rate as the difference between the target temperature and the tolerance, wherein T Lower limit of storehouse ＜T Target object -delta T; the temperature drop rate is the absolute value of the difference between the previous minute bank temperature and the current bank temperature, T Rate of temperature drop = | previous minute bank temperature-current bank Wen.
Likewise, if the shutdown time interval t < t Shortest stop of the unit is detected three times in succession, the lower limit of the warehouse temperature at which the remaining rate of temperature drop is minimum is set to: t Lower limit of storehouse ＜T Target object -DeltaT.
When the temperature lower limit values of all the storehouses are adjusted to (T Target object -DeltaT), the control flow is ended.
Fig. 2 is a flowchart of an embodiment of a cooling control method for a refrigerator according to the present invention. The cooling control method of the refrigeration house comprises the following steps:
s10, setting a target temperature of a warehouse, and opening a liquid supply electromagnetic valve SVn of the warehouse when the temperature of the warehouse is greater than the sum of the target temperature and the tolerance; when the temperature of the storehouse is smaller than the difference between the target temperature and the tolerance, closing a liquid supply electromagnetic valve SVn of the storehouse;
s11, adjusting the opening of the electronic expansion valve of the storeroom according to the suction superheat degree of the electronic expansion valve;
s12, judging whether the shutdown time interval of the unit detected for three times continuously is smaller than the set shortest shutdown time, if not, maintaining the set value of the suction superheat degree unchanged; if yes, the superheat setting value of the warehouse electronic expansion valve with the minimum temperature rise rate is reduced;
s13, when the set values of the suction superheat degree of all the warehouse electronic expansion valves are adjusted to the minimum value S, judging whether the time interval for continuously detecting the machine set for three times is smaller than the set shortest stop time, and if not, maintaining the set values of the suction superheat degree unchanged; if not, the temperature lower limit value of the storeroom with the minimum temperature drop rate is adjusted.
According to the cooling control method for the refrigeration house, provided by the invention, the liquid supply electromagnetic valve of the refrigeration house, the superheat degree set value of the electronic expansion valve and the lower limit value of the refrigeration house temperature are sequentially adjusted according to the start-stop condition of the refrigeration house unit, the temperature rise rate of the refrigeration house and the temperature drop rate of the refrigeration house, so that the normal cooling of the refrigeration house is ensured, and the technical problems of frequent start-stop, power consumption increase, oil running and the like which are easy to occur in a parallel screw unit for the refrigeration house with smaller load are solved.
The foregoing is only a specific embodiment of the invention. It should be noted that any modifications, equivalent substitutions and variations made within the spirit and scope of the inventive concept should be included in the scope of the present invention.
Claims (7)
1. The cooling control method for the refrigerator is characterized by comprising the following steps of:
s11, adjusting the opening of the electronic expansion valve of the storeroom according to the suction superheat degree of the electronic expansion valve;
S12, when the shutdown time interval of the unit is detected to be smaller than the set shortest shutdown time three times continuously, comparing the temperature rise rates of all the storehouses, and reducing the superheat degree set value of the electronic expansion valve of the storehouses with the minimum temperature rise rate;
S13, when the set value of the suction superheat degree of all the storehouses is adjusted to the minimum value S, the temperature drop rate of each storehouse is compared and the lower limit value of the storehouse with the minimum temperature drop rate is adjusted when the set shutdown time interval of three continuous times is smaller than the set shortest shutdown time.
2. The method of cooling control in a refrigerator according to claim 1, wherein the rate of temperature rise is an absolute value of a difference between a current temperature of the refrigerator and a previous minute of temperature of the refrigerator.
3. The cooling control method of refrigeration house according to claim 1, wherein the value of the superheat degree setting value of the electronic expansion valve is S1 each time, and the minimum value of the superheat degree setting value is greater than or equal to the minimum value of the values S.
4. The cooling control method of claim 3, wherein the value S1 is 0.5 and the minimum value S is 2.
5. The method of cooling control in a refrigerator according to claim 1, wherein the temperature drop rate is an absolute value of a difference between a previous minute of the temperature of the refrigerator and a current temperature of the refrigerator.
6. The cooling control method of a refrigerator according to claim 1, further comprising the step of S10, setting a target temperature of the refrigerator, and opening a liquid supply solenoid valve SVn of the refrigerator when the temperature of the refrigerator is greater than the sum of the target temperature and an allowance; when the temperature of the reservoir is less than the difference between the target temperature and the tolerance, the liquid supply solenoid valve SVn of the reservoir is closed.
7. A refrigerator, characterized in that the refrigerator adopts the refrigerator cooling control method according to any one of claims 1 to 6.
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| CN202211296997.0A CN115823807B (en) | 2022-10-21 | 2022-10-21 | Cold storage and cooling control method thereof |
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| CN202211296997.0A CN115823807B (en) | 2022-10-21 | 2022-10-21 | Cold storage and cooling control method thereof |
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| CN115823807B true CN115823807B (en) | 2024-08-27 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438547A (en) * | 2013-09-23 | 2013-12-11 | 深圳麦克维尔空调有限公司 | Control method of electronic expansion valve |
| CN105526773A (en) * | 2014-10-21 | 2016-04-27 | 株式会社鹭宫制作所 | Control device and control method of refrigerated storage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0235326B1 (en) * | 1986-03-03 | 1988-12-14 | LITEF GmbH | Navigation method |
| JP3999608B2 (en) * | 2002-09-03 | 2007-10-31 | 東芝キヤリア株式会社 | Air conditioner |
| JP5500291B2 (en) * | 2013-04-25 | 2014-05-21 | 富士電機株式会社 | Cooling system |
| US11293690B1 (en) * | 2018-12-14 | 2022-04-05 | Mark Whitfield | Modular refrigeration system |
| NL2025130B1 (en) * | 2020-03-13 | 2021-10-19 | Air Supplies Holland B V | Climate control unit and system comprising the same |
| CN111735263B (en) * | 2020-07-23 | 2024-02-13 | 珠海格力电器股份有限公司 | Refrigerating system, storage and temperature adjusting method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438547A (en) * | 2013-09-23 | 2013-12-11 | 深圳麦克维尔空调有限公司 | Control method of electronic expansion valve |
| CN105526773A (en) * | 2014-10-21 | 2016-04-27 | 株式会社鹭宫制作所 | Control device and control method of refrigerated storage |
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