CN111829215A - Control method for improving refrigeration energy efficiency of low-temperature heat pump unit through electromagnetic valve - Google Patents
Control method for improving refrigeration energy efficiency of low-temperature heat pump unit through electromagnetic valve Download PDFInfo
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- CN111829215A CN111829215A CN202010584852.5A CN202010584852A CN111829215A CN 111829215 A CN111829215 A CN 111829215A CN 202010584852 A CN202010584852 A CN 202010584852A CN 111829215 A CN111829215 A CN 111829215A
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- temperature sensing
- heat pump
- electromagnetic valve
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000003507 refrigerant Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 2
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/09—Improving heat transfers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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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
Abstract
The invention relates to the technical field of air conditioners, in particular to a control method for improving the refrigeration energy efficiency of a low-temperature heat pump unit through an electromagnetic valve; the temperature control device comprises a control unit (1), a switch unit (D), a switch unit (F), a temperature sensing unit (A), a temperature sensing unit (B) and a temperature sensing unit (C); the switch unit (D), the switch unit (F), the temperature sensing unit (A), the temperature sensing unit (B) and the temperature sensing unit (C) are respectively electrically connected with the control unit (1); the three-way valve also comprises a four-way valve (4), a three-way pipe (E), a power supply, a connecting copper pipe (G) and a connecting copper pipe (H); the four-way valve (4) is used for switching a refrigeration and heating mode; the copper pipe is used for connecting the switch unit (D), the switch unit (F) and the three-way pipe (E); the control unit (1) is a controller for controlling the on and off of the switch units (D) and (F) and receiving feedback signals of all the temperature sensing units and sending control commands.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for improving the refrigeration energy efficiency of a low-temperature heat pump unit through an electromagnetic valve.
Background
As is known, in the process of refrigeration by a low-temperature heat pump unit, a refrigerant throttled by a main electronic expansion valve enters an economizer first, and then enters an evaporator for heat exchange after exiting from the economizer, and the refrigerant generates great pressure loss when passing through the economizer, so that the power consumption of a compressor is increased, and the refrigeration efficiency is reduced.
In order to solve the problem, generally, in a refrigeration mode of a low-temperature heat pump unit, the reduction of the refrigeration energy efficiency of the unit is avoided by increasing the degree of superheat of evaporation during refrigeration to reduce the opening degree of a main electronic expansion valve. However, this solution has the following drawbacks: when the degree of superheat of evaporation is high and the opening degree of the main electronic expansion valve is small, the refrigerating capacity of the unit cannot exert the best effect.
Disclosure of Invention
The invention aims to solve the technical problems and provides a control method for improving the refrigeration energy efficiency of a low-temperature heat pump unit through a solenoid valve, and the control method aims to solve the technical problems. Therefore, the opening degree of the main electronic expansion valve needs to be reduced by increasing the evaporation superheat degree during refrigeration so as to avoid the reduction of the refrigeration energy efficiency of the unit. However, this solution has the following drawbacks: when the degree of superheat of evaporation is high and the opening degree of the main electronic expansion valve is small, the refrigerating capacity of the unit cannot exert the best effect. In summary, the invention has the advantages of ensuring that the exhaust temperature is reduced when the exhaust temperature of the compressor is high, and ensuring that the power consumption of the compressor is reduced and the refrigeration energy efficiency is improved by reducing the pressure loss of the system of the unit.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the temperature control device comprises a control unit, a switch unit D, a switch unit F, a temperature sensing unit A, a temperature sensing unit B and a temperature sensing unit C; the switch unit A, the switch unit B, the temperature sensing unit A, the temperature sensing unit B and the temperature sensing unit C are respectively electrically connected with the control unit; the device also comprises a four-way valve, a three-way pipe, a power supply, a connecting copper pipe G and a connecting copper pipe H; the four-way valve is used for switching a refrigeration and heating mode; the copper pipe is used for connecting the switch unit A, the switch unit B and the three-way pipe.
Further optimizing the technical scheme, the control unit is a controller which controls the switch unit A, B to be switched on and off and receives feedback signals of all the temperature sensing units and sends control commands.
Further optimizing the technical scheme, the switch unit A and the switch unit B are on-off electromagnetic valves; the switch unit A is used for opening a refrigerant channel; the switching unit B serves to close the refrigerant passage.
Further optimizing the technical scheme, the temperature sensing unit A is an ambient temperature sensor and is used for detecting ambient temperature; the temperature sensing unit B is an exhaust temperature sensor and is used for detecting the exhaust temperature of the compressor; the temperature sensing unit C is a water inlet temperature sensor and is used for detecting the water inlet temperature.
Further optimizing the technical scheme, the control method comprises the following steps: when the four-way valve 4 is in a power-on refrigeration mode, if the delta Th-specified value h is larger than or equal to 0 and the delta Tp-specified value p is larger than or equal to 0 for 10 seconds, the switch unit D in the electromagnetic valve assembly 8 is closed and the switch unit F is opened, so that a part of refrigerant enters the air injection enthalpy-increasing port of the compressor after passing through the economizer to reduce the exhaust temperature, otherwise, the switch unit D in the electromagnetic valve assembly 8 is opened and the switch unit F is closed, so that the refrigerant is directly sent to the evaporator without passing through the economizer, the pressure loss of the system is reduced, and the power consumption of the compressor is reduced, and the refrigeration energy.
Further optimizing the technical scheme, the Δ Th is a difference between the temperature Th sensed by the actually measured temperature sensing unit a in the refrigeration mode and a temperature set value Th'.
Further optimizing the technical scheme, the Th' is the minimum value of the outdoor environment temperature of the refrigeration working condition specified in the national standard corresponding to the unit.
Further optimizing the technical scheme, wherein the specified value h is the maximum deviation of the environmental temperature specified in the national standard corresponding to the unit.
Further optimizing the technical scheme, the Δ Tp is a difference between the temperature Tp sensed by the actually measured temperature sensing unit B in the refrigeration mode and a temperature set value Tp'.
Further optimizing the technical scheme, the TP' is the maximum value of actually measured exhaust temperature of the normal unit in the current environment temperature interval in the refrigeration mode.
Further optimizing the technical scheme, the specified value p is the maximum deviation of the actually measured exhaust temperature of the normal unit in the current environment temperature interval in the refrigeration mode.
Compared with the prior art, the invention has the following advantages: because the traditional method is that the low-temperature heat pump unit enters the economizer first from the refrigerant throttled by the main electronic expansion valve in the refrigeration process, and then enters the evaporator for heat exchange after coming out of the economizer, the refrigerant generates great pressure loss when passing through the economizer, so that the power consumption of the compressor is increased, and the refrigeration energy efficiency is reduced. Therefore, the opening degree of the main electronic expansion valve needs to be reduced by increasing the evaporation superheat degree during refrigeration so as to avoid the reduction of the refrigeration energy efficiency of the unit. However, this solution has the following drawbacks: when the degree of superheat of evaporation is high and the opening degree of the main electronic expansion valve is small, the refrigerating capacity of the unit cannot exert the best effect. In summary, the invention has the advantages of ensuring that the exhaust temperature is reduced when the exhaust temperature of the compressor is high, and ensuring that the power consumption of the compressor is reduced and the refrigeration energy efficiency is improved by reducing the pressure loss of the system of the unit.
Drawings
Fig. 1 is a schematic diagram of a solenoid valve assembly device for improving refrigeration energy efficiency of a low-temperature module unit.
In the figure: 1. a control unit; 2. a gas-liquid separator; 3. a compressor; 4. a four-way valve; 5. an economizer; 6. a shell and tube heat exchanger; 7. an auxiliary electronic expansion valve; 8. a solenoid valve assembly; 9. a main electronic expansion valve; 10. an outdoor heat exchanger; A. a temperature sensing unit; B. a temperature sensing unit; C. a temperature sensing unit; D. a switch unit; E. a three-way pipe; F. a switch unit; G. connecting a copper pipe; H. and connecting the copper pipe.
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 further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
When in use, as shown in figure 1, in the system circulation flow, during the refrigeration operation, the refrigerant gas entering the air suction port of the compressor 3 is compressed and then changed into high-temperature high-pressure refrigerant gas which is discharged from the air discharge port of the compressor, is guided by the four-way valve 4 to reach the outdoor heat exchanger 10 for condensation and then changed into high-temperature high-pressure refrigerant liquid, and is changed into low-temperature low-pressure refrigerant liquid after being throttled by the main electronic expansion valve 9, a, if the condition that the DeltaTh-specified value h is more than or equal to 0 and (the condition that the DeltaTp-specified value p is more than or equal to 0 for 5 seconds) is met, the control unit 1 controls the switch unit D and the air injection electromagnetic valve C to be opened and the switch unit F to be closed, the low-temperature low-pressure refrigerant liquid coming out of the main electronic expansion valve 9 enters the main circuit of the economizer 5 through the switch unit D and then is divided into, the refrigerant gas enters the compressor 3 from the air suction port of the compressor 3 through the four-way valve 4 to be compressed and discharged from the exhaust port of the compressor 3; thus, a refrigeration cycle is formed; b. if the condition that the difference between the DeltaTh and the specified value h is not less than or equal to 0 and the condition that the difference between the DeltaTp and the specified value p is more than or equal to 0 and lasts for 5 seconds is not met, the control unit 1 controls the switch unit D and the air injection electromagnetic valve C to be closed and the switch unit F to be opened, low-temperature low-pressure refrigerant liquid coming out of the main electronic expansion valve 9 directly enters the water heat exchanger 6 through the switch unit F to absorb the heat of water to become low-pressure refrigerant gas, and the refrigerant gas enters the gas-liquid separator 2 through the four-way valve 4, then enters the compressor 3 from an; the refrigerant does not pass through an economizer to reduce the pressure loss of the system so as to reduce the power consumption of the compressor and improve the refrigeration energy efficiency, thus forming a refrigeration cycle;
when the air-jet type air conditioner is used, as shown in fig. 1, in the control process, the switch unit D is connected to the control unit 1 through an electromagnetic valve connecting line, the switch unit F is connected to the control unit 1 through an electromagnetic valve connecting line, the air-jet electromagnetic valve C is connected to the control unit 1 through an electromagnetic valve connecting line, the sensing unit A is connected to the control unit 1 through a temperature sensor connecting line, the sensing unit B is connected to the control unit 1 through a temperature sensor connecting line, and the control unit 1 is connected to an outdoor unit to a power supply, so that.
The control mode of the invention is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of a person skilled in the art, the invention belongs to the common knowledge in the field, and the invention is mainly used for protecting the mechanical arrangement, so the control mode and the circuit connection are not explained in detail in the invention.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. The utility model provides a improve low temperature heat pump set through solenoid valve which characterized in that: the temperature control device comprises a control unit (1), a switch unit (D), a switch unit (F), a temperature sensing unit (A), a temperature sensing unit (B) and a temperature sensing unit (C); the switch unit (D), the switch unit (F), the temperature sensing unit (A), the temperature sensing unit (B) and the temperature sensing unit (C) are respectively electrically connected with the control unit (1); the three-way valve also comprises a four-way valve (4), a three-way pipe (E), a power supply, a connecting copper pipe (G) and a connecting copper pipe (H); the four-way valve (4) is used for switching a refrigeration and heating mode; the copper pipe is used for connecting the switch unit (D), the switch unit (F) and the three-way pipe (E); the control unit (1) is a controller for controlling the on and off of the switch units (D) and (F) and receiving feedback signals of all the temperature sensing units and sending control commands.
2. The electromagnetic valve based low temperature heat pump set improved by the claim 1 is characterized in that: the switch unit (D) and the switch unit (F) are on-off electromagnetic valves; the switching unit (D) is used for opening a refrigerant channel; the switching unit (F) is used for closing a refrigerant passage.
3. The electromagnetic valve based low temperature heat pump set improved by the claim 1 is characterized in that: the temperature sensing unit (A) is an ambient temperature sensor and is used for detecting ambient temperature; the temperature sensing unit (B) is an exhaust temperature sensor and is used for detecting the exhaust temperature of the compressor (3); the temperature sensing unit (C) is an inlet water temperature sensor and is used for detecting the inlet water temperature.
4. A control method for improving the refrigeration energy efficiency of a low-temperature heat pump unit through an electromagnetic valve is characterized in that: when the four-way valve (4) is electrified (in a refrigeration mode), if the time (Delta Th-specified value h is more than or equal to 0) and the time (Delta Tp-specified value p is more than or equal to 0) lasts for 10 seconds, the switching unit (D) in the solenoid valve assembly (8) is closed and the switching unit (F) is opened to realize that a part of refrigerant enters the air injection enthalpy increasing port of the compressor (3) after passing through the economizer (5) to reduce the exhaust temperature, otherwise, the switching unit (D) in the solenoid valve assembly (8) is opened and the switching unit (F) is closed to realize that the refrigerant directly enters the evaporator without passing through the economizer (5) so as to reduce the pressure loss of the system and further reduce the power consumption of the compressor (3) and improve the refrigeration energy efficiency.
5. The electromagnetic valve based low temperature heat pump set improved by the claim 4 is characterized in that: and the delta Th is the difference between the temperature Th sensed by the actually measured temperature sensing unit (A) in the cooling mode and a temperature set value Th'.
6. The electromagnetic valve based low temperature heat pump set improved by the claim 4 is characterized in that: and the Th' is the minimum value of the outdoor ambient temperature of the refrigeration working condition specified in the national standard corresponding to the unit.
7. The electromagnetic valve based low temperature heat pump set improved by the claim 4 is characterized in that: and the specified value h is the maximum deviation of the environmental temperature specified in the national standard corresponding to the unit.
8. The electromagnetic valve based low temperature heat pump set improved by the claim 4 is characterized in that: the Δ Tp is a difference between the temperature Tp sensed by the measured temperature sensing unit (B) in the cooling mode and a temperature set value Tp'.
9. The electromagnetic valve based low temperature heat pump set improved by the claim 4 is characterized in that: and the TP' is the maximum value of the actually measured exhaust temperature of the normal unit in the current environment temperature interval in the refrigeration mode.
10. The electromagnetic valve based low temperature heat pump set improved by the claim 4 is characterized in that: and the specified value p is the maximum deviation of the actually measured exhaust temperature of the normal unit in the current environment temperature interval in the refrigeration mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010584852.5A CN111829215A (en) | 2020-06-24 | 2020-06-24 | Control method for improving refrigeration energy efficiency of low-temperature heat pump unit through electromagnetic valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010584852.5A CN111829215A (en) | 2020-06-24 | 2020-06-24 | Control method for improving refrigeration energy efficiency of low-temperature heat pump unit through electromagnetic valve |
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| CN111829215A true CN111829215A (en) | 2020-10-27 |
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| CN202010584852.5A Pending CN111829215A (en) | 2020-06-24 | 2020-06-24 | Control method for improving refrigeration energy efficiency of low-temperature heat pump unit through electromagnetic valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856546A (en) * | 2021-03-29 | 2021-05-28 | 河北博志热能设备有限公司 | Heating assembly device for improving heating effect of side room for heating of heat pump and control method thereof |
| CN112857022A (en) * | 2021-03-29 | 2021-05-28 | 河北博志热能设备有限公司 | Heating assembly device for improving air outlet temperature of heat pump drying unit and control method thereof |
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| CN212778050U (en) * | 2020-06-24 | 2021-03-23 | 河北博志热能设备有限公司 | Electromagnetic valve assembly device for improving refrigeration energy efficiency of low-temperature module unit |
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2020
- 2020-06-24 CN CN202010584852.5A patent/CN111829215A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203657295U (en) * | 2013-12-05 | 2014-06-18 | 广东芬尼克兹节能设备有限公司 | Multi-source adjusting and controlling ultra-low temperature heat pump |
| US20170356778A1 (en) * | 2016-06-09 | 2017-12-14 | Maersk Container Industry A/S | Method for real-time performance check of container system |
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| CN212778050U (en) * | 2020-06-24 | 2021-03-23 | 河北博志热能设备有限公司 | Electromagnetic valve assembly device for improving refrigeration energy efficiency of low-temperature module unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856546A (en) * | 2021-03-29 | 2021-05-28 | 河北博志热能设备有限公司 | Heating assembly device for improving heating effect of side room for heating of heat pump and control method thereof |
| CN112857022A (en) * | 2021-03-29 | 2021-05-28 | 河北博志热能设备有限公司 | Heating assembly device for improving air outlet temperature of heat pump drying unit and control method thereof |
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