CN110906541A - Method for accurately judging refrigerant leakage of variable-frequency heat pump water heater for heating - Google Patents

Method for accurately judging refrigerant leakage of variable-frequency heat pump water heater for heating Download PDF

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Publication number
CN110906541A
CN110906541A CN201911230561.XA CN201911230561A CN110906541A CN 110906541 A CN110906541 A CN 110906541A CN 201911230561 A CN201911230561 A CN 201911230561A CN 110906541 A CN110906541 A CN 110906541A
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China
Prior art keywords
refrigerant
expansion valve
heat pump
electronic expansion
frequency
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CN201911230561.XA
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CN110906541B (en
Inventor
李锡宇
徐言生
李东洺
吴治将
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Shunde Polytechnic
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Shunde Polytechnic
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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 a method for accurately judging the leakage of a refrigerant of a variable-frequency heat pump water heater for heating, which is characterized by comprising the following steps of: under the condition of the rated charging amount of the refrigerant, establishing a relational expression I of the optimal opening value a of the electronic expansion valve along with the change of the outdoor environment temperature Tw and the operation frequency f of the variable-frequency compressor in the controller; setting the maximum refrigerant leakage allowed in normal operation, and establishing a relational expression II of the optimal measurement opening degree value b of the electronic expansion valve along with the change of the outdoor environment temperature Tw and the operation frequency f of the variable-frequency compressor in the controller; during operation, if c (actual opening) is larger than b, the leakage amount of the refrigerant is possibly larger than an allowable value, and secondary judgment is needed according to the steps; controller dropFrequency of the low frequency conversion compressor, if the current actual opening value c of the electronic expansion valve at the moment2＞b2It indicates that the refrigerant leakage amount exceeds the allowable value. The method can accurately judge the leakage amount of the refrigerant of the heat pump system, can find faults as soon as possible, ensures the operation performance of the heat pump system, and does not need to additionally increase a detection and control part.

Description

Method for accurately judging refrigerant leakage of variable-frequency heat pump water heater for heating
Technical Field
The invention relates to a method for accurately judging the leakage of a refrigerant of a variable-frequency heat pump water heater for heating.
Background
The heat pump water heater is used as an efficient energy-saving hot water product and is widely applied to heating in winter. From the main application places at present, no specially-assigned person carries out operation maintenance management mostly, and the operation condition of the equipment is mainly judged and alarmed by a fault diagnosis system carried by the equipment. At present, the most problem encountered in the operation process of a heat pump water heater is refrigerant leakage, and when the refrigerant leakage is judged, the judgment is mostly carried out by the temperature reduction condition of an outdoor heat exchanger coil; in order to avoid misjudgment, the judgment parameter is based on the operation parameter after the refrigerant leaks 20-30%; in fact, as judged as such, the performance of the heat pump system has severely degraded; therefore, the leakage of the refrigerant of the heat pump system needs to be accurately judged, problems are found as soon as possible, and the operation performance of the heat pump system is guaranteed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provide a method for accurately judging the leakage of a refrigerant of a variable-frequency heat pump water heater for heating, find problems as soon as possible and ensure the running performance of a heat pump system.
In order to achieve the above object, the present invention is realized as such, and is a method for accurately judging refrigerant leakage of a variable-frequency heat pump water heater for heating, which is characterized in that the heat pump water heater comprises a variable-frequency compressor, a heating heat exchanger, an electronic expansion valve, an outdoor heat exchanger, a controller, a refrigerant inlet temperature sensor, an outlet temperature sensor and an outdoor environment temperature sensor; the temperature sensor is arranged at the refrigerant inlet of the outdoor heat exchanger, the temperature detected by the refrigerant inlet temperature sensor is the refrigerant inlet temperature Tj of the outdoor heat exchanger, the outlet temperature sensor is arranged at the refrigerant outlet of the outdoor heat exchanger, the temperature detected by the outlet temperature sensor is the refrigerant outlet temperature Tc of the outdoor heat exchanger, and the temperature detected by the outdoor environment temperature sensor is the outdoor environment temperature Tw; the refrigerant leakage judgment comprises the following steps:
(a) through experimental tests, under the condition of the rated charging amount of the refrigerant of the heat pump system, under different outdoor environment temperatures Tw and different operating frequencies f of the variable frequency compressor, the optimal opening value a of the electronic expansion valve is obtained, and a relational expression I of the optimal opening value a of the electronic expansion valve changing along with the outdoor environment temperatures Tw and the operating frequencies f of the variable frequency compressor is established in a controller: a = g (Tw, f); simultaneously setting a maximum value Ts of a set superheat degree delta T (delta T = Tc-Tj) of the refrigerant of the outdoor heat exchanger;
(b) setting the maximum refrigerant leakage amount allowed by the normal operation of the heat pump system, wherein the maximum refrigerant leakage amount range is 0-10% of the rated charge amount, and preferably 5%; under the condition of the maximum refrigerant leakage amount allowed by the heat pump system, through test tests, under different outdoor environment temperatures Tw and different operating frequencies f of the variable-frequency compressor, the optimal measurement opening value b of the electronic expansion valve is measured, and a relational expression II that the optimal measurement opening value b of the electronic expansion valve changes along with the outdoor environment temperatures Tw and the operating frequencies f of the variable-frequency compressor is established in a controller, wherein b = h (Tw, f);
(c) during operation, under the outdoor environment temperature Tw and the operation frequency f of the inverter compressor, the controller detects the actual opening value c of the electronic expansion valve and the actual superheat degree Δ T1 of the refrigerant at that time: if a is more than or equal to c and less than or equal to b, indicating that the leakage amount of the refrigerant is in an allowable range; if c is larger than b, indicating that the leakage amount of the refrigerant possibly exceeds an allowable value, and continuously judging the heat pump system for the second time according to the step (d);
(d) the controller reduces the frequency of the inverter compressor for operation, preferably by 10HZObtaining the outdoor ambient temperature Tw and the new operating frequency f of the inverter compressor according to the relation I2Current optimum opening degree value a of electronic expansion valve2And obtaining the current optimal measurement opening degree value b of the electronic expansion valve according to the relation formula II2If the current actual opening value c of the electronic expansion valve is at the moment2＞b2If the refrigerant leakage quantity exceeds the allowable value, the controller gives a refrigerant leakage alarm; if c is2≤b2Then, thenIndicating a non-refrigerant leak failure.
Compared with the prior art, the invention has the following advantages:
(1) the leakage amount of the refrigerant of the heat pump system can be accurately judged, faults can be found as soon as possible, and the operation performance of the heat pump system is ensured;
(2) the heat pump system does not need to additionally increase a detection and control component.
Drawings
Fig. 1 is a schematic diagram of a heating inverter heat pump system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the method is for accurately determining the refrigerant leakage of the heating variable-frequency heat pump water heater, and the heat pump water heater comprises a variable-frequency compressor 1, a heating heat exchanger 2, an electronic expansion valve 3, an outdoor heat exchanger 4, a controller 5, an outdoor heat exchanger refrigerant inlet temperature sensor 6, an outlet temperature sensor 7 and an outdoor environment temperature sensor 8. The temperature detected by the outdoor heat exchanger refrigerant inlet temperature sensor 6 is the outdoor heat exchanger refrigerant inlet temperature Tj; the temperature detected by the outdoor heat exchanger refrigerant outlet temperature sensor 7 is the outdoor heat exchanger refrigerant outlet temperature Tc; the temperature detected by the outdoor ambient temperature sensor 8 is the outdoor ambient temperature Tw; the refrigerant leakage judgment comprises the following steps:
(a) through experimental tests, under the condition of the rated charging amount of the refrigerant of the heat pump system, under different outdoor environment temperatures Tw and different operating frequencies f of the inverter compressor 1, the optimal opening degree value a of the electronic expansion valve 3 is obtained, and a relation formula I that the optimal opening degree value a of the electronic expansion valve 3 changes along with the outdoor environment temperatures Tw and the operating frequencies f of the inverter compressor 1 is established in the controller 5: a = g (Tw, f); simultaneously setting a maximum value Ts of a set degree of superheat Δ T (Δ T = Tc-Tj) of the refrigerant of the outdoor heat exchanger 4;
(b) setting the maximum refrigerant leakage amount allowed by the normal operation of the heat pump system to be 5% of the rated refrigerant charge amount, namely, the refrigerant amount reserved by the heat pump system to be 95% of the rated charge amount, under the condition, through experimental tests, under different outdoor environment temperatures Tw and different operation frequencies f of the variable frequency compressor 1, measuring the optimal measurement opening degree value b of the electronic expansion valve 3, and establishing a relation formula II that the optimal measurement opening degree value b of the electronic expansion valve 3 changes along with the outdoor environment temperatures Tw and the operation frequencies f of the variable frequency compressor 1 in the controller 5, wherein b = h (Tw, f);
(c) in operation, the controller 5 obtains the current outdoor ambient temperature Tw, the operating frequency f of the inverter compressor 1, the actual opening degree c of the electronic expansion valve 3 and the actual superheat degree Δ T1 of the refrigerant at that time: if a is more than or equal to c and less than or equal to b, the leakage amount of the refrigerant is within 5 percent, and the heat pump system can normally operate; if c is larger than b, indicating that the leakage amount of the refrigerant possibly exceeds 5%, and continuously judging the heat pump system for the second time according to the step (d);
(d) the controller 5 reduces the frequency 10H of the compressor 1ZThe operation is carried out, and the outdoor environment temperature Tw and the new operation frequency f of the inverter compressor 1 are obtained according to the relation formula I2Then, the current optimum opening degree value a of the electronic expansion valve 3 is obtained2And obtaining the current optimum measurement opening degree value b of the electronic expansion valve 3 according to the relation formula II2If the current actual opening degree c of the electronic expansion valve 3 is present at this time2＞b2If the refrigerant leakage amount exceeds 5%, the controller 5 gives a refrigerant leakage alarm; if c is2≤b2A non-refrigerant leak failure is indicated.
Note: the maximum refrigerant leakage amount range of a manufacturer can be selected between 0-10% of rated charge amount according to the performance of the heat pump system.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (1)

1. A method for accurately judging the leakage of a refrigerant of a frequency conversion heat pump water heater for heating is characterized in that the heat pump water heater comprises a frequency conversion compressor (1), a heating heat exchanger (2), an electronic expansion valve (3), an outdoor heat exchanger (4), a controller (5), a refrigerant inlet temperature sensor (6), an outlet temperature sensor (7) and an outdoor environment temperature sensor (8); the refrigerant inlet temperature sensor (6) is arranged at a refrigerant inlet of the outdoor heat exchanger (4), the temperature detected by the refrigerant inlet temperature sensor (6) is the refrigerant inlet temperature Tj of the outdoor heat exchanger (4), the outlet temperature sensor (7) is arranged at a refrigerant outlet of the outdoor heat exchanger (4), the temperature detected by the outlet temperature sensor (7) is the refrigerant outlet temperature Tc of the outdoor heat exchanger (4), and the temperature detected by the outdoor environment temperature sensor (8) is the outdoor environment temperature Tw; the refrigerant leakage judgment comprises the following steps:
(a) through experimental tests, under the condition of the rated charging amount of the refrigerant of the heat pump system, under different outdoor environment temperatures Tw and different operating frequencies f of the inverter compressor (1), the optimal opening value a of the electronic expansion valve (3) is obtained, and a relational expression I of the optimal opening value a of the electronic expansion valve (3) changing along with the outdoor environment temperatures Tw and the operating frequencies f of the inverter compressor (1) is established in the controller (5): a = g (Tw, f); simultaneously setting a maximum value Ts of a set superheat degree delta T (delta T = Tc-Tj) of the refrigerant of the outdoor heat exchanger (4);
(b) setting the maximum refrigerant leakage amount allowed by the normal operation of the heat pump system, wherein the maximum refrigerant leakage amount range is 0-10% of the rated charge amount, and preferably 5%; under the condition of the maximum refrigerant leakage amount allowed by the heat pump system, through test tests, under different outdoor environment temperatures Tw and different operating frequencies f of the variable-frequency compressor (1), measuring the optimal measurement opening value b of the electronic expansion valve (3), and establishing a relation II of the optimal measurement opening value b of the electronic expansion valve (3) along with the change of the outdoor environment temperatures Tw and the operating frequencies f of the variable-frequency compressor (1) in the controller (5), wherein b = h (Tw, f);
(c) during operation, under the outdoor environment temperature Tw and the operation frequency f of the inverter compressor (1), the controller (5) detects the actual opening value c of the electronic expansion valve (3) and the actual superheat degree delta T1 of the refrigerant at the moment: if a is more than or equal to c and less than or equal to b, indicating that the leakage amount of the refrigerant is in an allowable range; if c is larger than b, indicating that the leakage amount of the refrigerant possibly exceeds an allowable value, and continuously judging the heat pump system for the second time according to the step (d);
(d) the controller (5) reduces the frequency of the inverter compressor (1) for operation, preferably by 10HZObtaining the outdoor ambient temperature Tw and the new operating frequency f of the inverter compressor (1) according to the relation I2Current optimum opening degree value a of lower electronic expansion valve (3)2And obtaining the current best measurement opening degree value b of the electronic expansion valve (3) according to the relation formula II2If the current actual opening value c of the electronic expansion valve (3) is at the moment2＞b2If the refrigerant leakage quantity exceeds the allowable value, the controller (5) gives a refrigerant leakage alarm; if c is2≤b2A non-refrigerant leak failure is indicated.
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Cited By (1)

* Cited by examiner, † Cited by third party
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JP2000104940A (en) * 1998-09-28 2000-04-11 Kyushu Electric Power Co Inc Heat pump type hot water supply system
CN103206750A (en) * 2013-04-12 2013-07-17 浙江大学 Multi-split air conditioning system and status switching control method therefor
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Publication number Priority date Publication date Assignee Title
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