CN113758067B - Enthalpy-spraying control method for low-temperature heat pump - Google Patents
Enthalpy-spraying control method for low-temperature heat pump Download PDFInfo
- Publication number
- CN113758067B CN113758067B CN202111135905.6A CN202111135905A CN113758067B CN 113758067 B CN113758067 B CN 113758067B CN 202111135905 A CN202111135905 A CN 202111135905A CN 113758067 B CN113758067 B CN 113758067B
- Authority
- CN
- China
- Prior art keywords
- enthalpy
- expansion valve
- temperature
- exhaust temperature
- electronic expansion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005507 spraying Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 37
- 239000007924 injection Substances 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 4
- 238000010257 thawing Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 4
- 239000007921 spray Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
Images
Classifications
-
- 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
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat pumps
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a low-temperature heat pump enthalpy injection control method, which comprises the following steps: step 1): heating and starting the system, and judging whether the enthalpy-spraying electronic expansion valve meets the opening condition; step 2): if the air conditioner is satisfied, determining the initial opening of the enthalpy-spraying electronic expansion valve according to the ambient temperature and the unit water inlet temperature; step 3): after the current initial opening of the electronic expansion valve is kept for a period of time, the control end controls and adjusts the step number of the electronic expansion valve according to the target exhaust temperature and the current exhaust temperature; step 4): judging whether the condition of closing the enthalpy-injection electronic expansion valve is satisfied. The opening degree of the electronic expansion valve is controlled to adjust the enthalpy injection flow when the compressor is operated, so that the problem that the exhaust temperature of the compressor is stable in a shorter time due to the fact that the exhaust temperature change range of the compressor is smaller in the starting process of the system is avoided, and the adaptability and the reliability of the system in a low-temperature environment are improved.
Description
Technical Field
The invention relates to the field of heating, in particular to a low-temperature heat pump enthalpy-spraying control method.
Background
The application of the low-temperature air source heat pump technology in the fields of air conditioning and heating and hot water greatly improves the life quality of human beings. At present, the application of the low-temperature air source heat pump technology in the industry mainly comprises two modes: one is spraying liquid, which is used for directly spraying the high-temperature and high-pressure supercooled liquid into an air suction port or a middle-pressure interface of a compressor after throttling and depressurization, so that the heating capacity can be greatly improved, the exhaust temperature can be reduced, and the running range of a unit can be expanded; in another scheme, the economizer is matched with a plate heat exchanger or a flash drum, a part of refrigerant is separated from a main path, throttled and then subjected to heat exchange and evaporation with the main path in the economizer, and then injected into a medium-pressure interface of the compressor. Both modes may be collectively referred to as enthalpy of injection. Because the low-temperature air source heat pump has a wide operating range, partial factories spray enthalpy and spray enthalpy electronic expansion valves are unreasonably controlled, and the temperature of exhaust gas can be fluctuated, so that the system operation is unstable. In particular, during the starting process, the exhaust temperature oscillates and fluctuates, which may cause the reliability of the entire system to deteriorate.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a low temperature heat pump enthalpy injection control method for solving the problem of unstable system due to temperature discharge when the compressor is started.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the heat supply system comprises a control end, a user end and a heating end, wherein the user end and the heating end exchange heat through a heat exchanger, the heating end comprises a compressor with an air injection enthalpy increasing function, the control end controls the opening of an enthalpy injection electronic expansion valve of the compressor so as to control the enthalpy injection flow, the purpose of controlling the exhaust temperature of the compressor is achieved, the heat supply system further comprises an exhaust sensor for detecting the exhaust temperature of the compressor, an environmental temperature sensor for detecting the environmental temperature, a water temperature sensor for detecting the inlet water temperature entering the exchanger from the user side, and the control method of the enthalpy injection is as follows:
step 1): heating and starting the system, and judging whether the enthalpy-spraying electronic expansion valve meets the opening condition; the conditions for opening the electronic expansion valve for the enthalpy injection include: (1) the ring temperature Ta is less than or equal to 12 ℃; (2) the exhaust temperature Td is more than or equal to the exhaust temperature range set by the enthalpy injection opening; the enthalpy spraying opening is set to a temperature range of 45-50 ℃; (3) the exhaust temperature Td is more than 40 ℃; simultaneously, the electronic enthalpy-spraying expansion valve can be opened when the opening condition is met;
step 2): if the air conditioner is satisfied, determining the initial opening of the enthalpy-spraying electronic expansion valve according to the ambient temperature and the unit water inlet temperature; if not, the enthalpy-injection electronic expansion valve is not opened;
step 3): after the current initial opening to time of the enthalpy-spraying electronic expansion valve is kept, the control end dynamically adjusts the step number of the enthalpy-spraying electronic expansion valve, the step number of the enthalpy-spraying electronic expansion valve is determined according to the target exhaust temperature and the current exhaust temperature of the compressor, and the stable operation of the system is ensured; the value range of to is 20 s-30 s;
step 4): judging whether the condition of closing the enthalpy-spraying electronic expansion valve is met or not; if yes, closing the enthalpy-injection electronic expansion valve; if not, entering a step 3), and continuously adjusting the step number of the enthalpy-injection electronic expansion valve; the conditions for closing the electronic expansion valve for enthalpy injection include: (1) the compressor is closed; (2) the compressor enters defrosting; (3) ambient temperature Ta > 13 ℃. The electronic enthalpy-spraying expansion valve can be closed when any closing condition is met;
preferably, in the step 2), the method for determining the initial opening degree of the electronic expansion valve for injecting enthalpy is as follows: initial opening = 8 xtwin-6 xta-180; ta is the ambient temperature, and the water inlet temperature of the unit is Tain.
Preferably, the electronic expansion valve with the minimum opening degree of 40 and the maximum opening degree of 480. Therefore, the upper limit and the lower limit of the opening of the electronic expansion valve are set, and the flow of the spray enthalpy is ensured not to be too large or too small under the condition that the electronic expansion valve is opened, so that the effectiveness of the spray enthalpy is ensured.
Preferably, in the step 3), if the current exhaust temperature Td (n) -the exhaust temperature control target To is equal To or less than the exhaust threshold β; the regulating step number of the enthalpy-spraying electronic expansion valve is DeltaU (n) = [ (A+B) & lt (n) -A & lt (n-1) ] +C & lt DeltaT (n) -2 & lt (n-1) +DeltaT (n-2) ], and the DeltaU (n) result is rounded to an integer. If I current exhaust temperature Td (n) -exhaust temperature control target ToI > exhaust threshold β; the regulating step number of the enthalpy-spraying electronic expansion valve is DeltaS (n) =A, deltaT (n) -A, deltaT (n-1) +C, deltaT (n) -2, deltaT (n-1) +DeltaT (n-2), and the DeltaS (n) result is rounded to an integer; wherein Δt (n) is the exhaust temperature deviation, Δt (n) =td (n) -To; td (n-1) is the exhaust temperature before 1 detection period, td (n-2) is the exhaust temperature before 2 detection periods, deltaT (n-1) is the exhaust temperature difference between the current time exhaust temperature Td (n) and the exhaust temperature before 1 detection period Td (n-1), deltaT (n-1) =Td (n-1) -To, deltaT (n-2) is the exhaust temperature difference between the current time exhaust temperature Td (n) and the exhaust temperature before 2 detection periods Td (n-2), deltaT (n-2) =Td (n-2) -To, A is a constant, B is a constant, and C is a constant. Thus, during the operation of the compressor, as the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To gradually decreases, the opening degree of the electronic expansion valve for injecting enthalpy also gradually decreases, so that the compressor is always ensured To stably operate after being opened.
Preferably, the value range of A is 3-10; b is a constant, and the value range of B is 0.1-10; c is a constant, and the value range of C is 2-15.
Preferably, the value of the exhaust threshold value β is in the range of 8 to 15 ℃. Thus, in this temperature range, the compressor tends to or is in a steady state.
Preferably, the value range of the detection period is 40 s-90 s; if the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is larger, the value of the detection period is smaller; if the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is larger, the detection period takes a larger value. In this way, under the condition that the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is large, the electronic expansion valve for injecting enthalpy performs high-frequency adjustment, under the condition that the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is small, the electronic expansion valve for injecting enthalpy performs low-frequency adjustment, so that the system can be stably started and stably reaches the set target.
Compared with the traditional technical scheme, the technical scheme of the invention adjusts the enthalpy-spraying flow rate when the compressor is operated by controlling the opening of the enthalpy-spraying electronic expansion valve, so that the problem that the exhaust temperature of the compressor is stable in a shorter time due to a smaller exhaust temperature change range of the compressor in the starting process of the system is avoided, the adaptability and the reliability of the system in a low-temperature environment are improved, and the probability of faults such as poor heating effect, dead halt and the like of the system is reduced.
Drawings
FIG. 1 is a schematic flow chart of a low temperature heat pump enthalpy injection control method in an embodiment of the invention;
fig. 2 is a peak comparison diagram of the implementation of the technical scheme of the present invention and the implementation of the technical scheme of the present invention in the embodiment of the present invention.
Reference numerals: 1. the change curve of the exhaust temperature of the compressor when the technical scheme is not executed; 2. the variation curve 2 of the discharge temperature of the compressor when the present embodiment is executed.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Examples
The low-temperature heat pump enthalpy-spraying control method as shown in fig. 1 is applied to a heating system, and the heating system comprises a control end, a user end, a heating end and a heat exchanger. The control end controls the opening of the enthalpy-injection electronic expansion valve of the compressor so as to control the enthalpy-injection flow and achieve the aim of controlling the exhaust temperature of the compressor; the user exchanges heat with the heating end through the heat exchanger. The system also comprises an exhaust gas sensor for detecting the exhaust gas temperature of the compressor, an environment temperature sensor for detecting the environment temperature and a water temperature sensor for detecting the inlet water temperature of the unit entering the exchanger from the user side.
The control method of the low temperature heat pump spray enthalpy is as follows:
step 1): the system is heated and started, and whether the electronic expansion valve for spraying enthalpy meets the opening adjustment is judged;
step 2): if yes, determining the initial opening of the electronic expansion valve of the enthalpy injection according to the ambient temperature and the water inlet temperature of the unit, and entering step 3); if not, the electronic expansion valve is not opened;
step 3): after the current initial opening to time of the enthalpy-spraying electronic expansion valve is kept, the control end dynamically adjusts the step number of the enthalpy-spraying electronic expansion valve, the step number of the enthalpy-spraying electronic expansion valve is determined according to the target exhaust temperature and the current exhaust temperature of the compressor, and the stable operation of the system is ensured; the value range of to is 20 s-30 s;
step 4): judging whether the condition of closing the enthalpy-spraying electronic expansion valve is met or not; if yes, closing the enthalpy-injection electronic expansion valve; if not, the step 3) is carried out, and the step number of the enthalpy-injection electronic expansion valve is continuously adjusted.
In this embodiment, in the above step 1), the conditions for opening the electronic expansion valve for injecting enthalpy include: (1) the ring temperature Ta is less than or equal to 12 ℃; (2) the exhaust temperature Td is more than or equal to the injection enthalpy opening setting exhaust temperature (the value range is 45-50 ℃); (3) the exhaust temperature Td is more than 40 ℃; meanwhile, the conditions are met, and the enthalpy-spraying electronic expansion valve can be opened.
In this embodiment, in the step 2), the method for determining the initial opening of the electronic expansion valve for injecting enthalpy is as follows: initial opening = 8 xtwin-6 xta-180; ta is the ambient temperature, and the water inlet temperature of the unit is Tain; the minimum opening degree of the electronic expansion valve for spraying enthalpy is 40 and the maximum opening degree of the electronic expansion valve for spraying enthalpy is 480; if the calculation result is smaller than 40, 40 is taken, if the calculation result is larger than 480, the value is 480. Therefore, the device is used for ensuring that the unit can be operated stably and accelerating the heating efficiency of the unit.
In this embodiment, in the above step 3), the adjustment steps of the electronic expansion valve for injecting enthalpy are determined as follows: Δt (n) is an exhaust temperature deviation, Δt (n) =td (n) -To, td (n) is a current time exhaust temperature, to is an exhaust temperature control target; the exhaust temperature Td (n-1) is the exhaust temperature before 1 detection period, and the exhaust temperature difference between the current time exhaust temperature Td (n) and the exhaust temperature Td (n-1) before 1 detection period is Δt (n-1) =td (n-1) -To; td (n-2) is the exhaust temperature before 2 detection periods, and the exhaust temperature difference between the current exhaust temperature Td (n) and the exhaust temperature Td (n-2) before 2 detection periods is: Δt (n-2) =td (n-2) -To. Wherein, the value range of the detection period is 40 s-90 s, and the larger the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is, the smaller the value of the detection period is; the larger the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is, the smaller the temperature difference is, and the larger the detection period value is; therefore, in the prior art, the quick adjustment and the slow adjustment of the electronic expansion valve for the enthalpy injection can be realized, the stable output of the compressor in the operation process is ensured, the compression and the instability caused by overlarge temperature difference between the exhaust temperature and the ambient temperature in a low-temperature environment are avoided, the service life of the compressor is prolonged, and the energy consumption of the compressor is reduced. In the present embodiment, if I the current exhaust temperature Td (n) -the exhaust temperature control target ToI is equal To or less than the exhaust threshold value beta (range of 8-15 ℃); the regulating step number of the enthalpy-spraying electronic expansion valve is DeltaU (n) = [ (A+B) & lt (n) -A & lt (n-1) ] +C & lt DeltaT (n) -2 & lt (n-1) +DeltaT (n-2) ], and the DeltaU (n) result is rounded to an integer. If I current exhaust temperature Td (n) -exhaust temperature control target ToI > exhaust threshold beta (range 8-15 ℃); the electronic expansion valve of the enthalpy of injection adjusts the step number to be DeltaS (n) =A DeltaT (n) -A DeltaT (n-1) +C [ DeltaT (n) -2 DeltaT (n-1) +DeltaT (n-2) ], and the DeltaS (n) result is rounded to an integer. Wherein A is a constant, and the value range of A is 3-10; b is a constant, and the value range of B is 0.1-10; c is a constant, and the value range of C is 2-15. The number of adjustment steps of the electronic expansion valve for injection of enthalpy is only related to three temperatures of the current exhaust temperature Td (n), the exhaust temperature T (n-1) of the exhaust temperature before 1 detection period, and the exhaust temperature Td (n-2) of the exhaust temperature before 2 detection periods. Thus, if the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is larger, the number of steps adjusted by the electronic expansion valve for enthalpy injection is larger; if the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is smaller, the step number regulated by the enthalpy-injection electronic expansion valve is smaller; the step number regulated by the enthalpy-spraying electronic expansion valve can be controlled within a reasonable range, so that the stable operation of the compressor is ensured, and the stable lifting of the temperature is ensured.
In this embodiment, in the above step 4), the conditions for closing the electronic expansion valve for injecting enthalpy include: (1) the compressor is closed; (2) the compressor enters defrosting; (3) ambient temperature Ta is more than 13 ℃; and the electronic expansion valve for spraying enthalpy can be closed when any closing condition is met. In this way, after the exhaust temperature Td and the ambient temperature Ta reach the target values, even if the electronic expansion valve for injecting enthalpy is closed, the energy consumption is reduced, and the purposes of energy conservation and emission reduction are achieved.
As shown in fig. 2, the horizontal direction in fig. 2 represents the operation time, and the vertical direction may represent the exhaust temperature, the exhaust pressure, the exhaust humidity, or the like; among the numerous curves of fig. 2, taking the change curve 1 of the exhaust temperature of the compressor when the present technical scheme is not executed and the change curve 2 of the exhaust temperature of the compressor when the present technical scheme is executed as an example, comparing the change curve 1 of the exhaust temperature of the compressor when the present technical scheme is not executed and the change curve 2 of the exhaust temperature of the compressor when the present technical scheme is executed can show that the exhaust temperature of the compressor can quickly reach the stable state after the present technical scheme is executed, thereby proving to distinguish the conventional technical scheme.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.
Claims (4)
1. The low-temperature heat pump enthalpy-spraying control method is applied to a heating system, the heating system comprises a control end, a user end and a heating end, the user end and the heating end perform heat exchange through a heat exchanger, the heating end comprises a compressor with an enthalpy-spraying function, the control end controls the opening degree of an enthalpy-spraying electronic expansion valve of the compressor through controlling the enthalpy-spraying flow, the purpose of controlling the exhaust temperature of the compressor is achieved, the low-temperature heat pump enthalpy-spraying control method further comprises an exhaust sensor used for detecting the exhaust temperature of the compressor, an environmental temperature sensor used for detecting the environmental temperature, and a water temperature sensor used for detecting the inlet water temperature of a unit entering the exchanger from the user side, and the low-temperature heat pump enthalpy-spraying control method is characterized in that: the control method of the low-temperature heat pump with the enthalpy injection comprises the following steps:
step 1): heating and starting the system, and judging whether the enthalpy-spraying electronic expansion valve meets the opening condition; the conditions for opening the electronic expansion valve for the enthalpy injection include: (1) the ring temperature Ta is less than or equal to 12 ℃; (2) the exhaust temperature Td is more than or equal to the exhaust temperature range set by the enthalpy injection opening; the exhaust temperature range set by the enthalpy spraying opening is 45-50 ℃; (3) the exhaust temperature Td is more than 40 ℃; simultaneously, the electronic enthalpy-spraying expansion valve can be opened when the opening condition is met;
step 2): if the air conditioner is satisfied, determining the initial opening of the enthalpy-spraying electronic expansion valve according to the ambient temperature and the unit water inlet temperature; if not, the enthalpy-injection electronic expansion valve is not opened; the method for determining the initial opening of the electronic expansion valve for the enthalpy injection is as follows: initial opening = 8 xtwin-6 xta-180; ta is the ambient temperature, and the water inlet temperature of the unit is Tain;
step 3): after the current initial opening to time of the enthalpy-spraying electronic expansion valve is kept, the control end dynamically adjusts the step number of the enthalpy-spraying electronic expansion valve, the step number of the enthalpy-spraying electronic expansion valve is determined according to the target exhaust temperature and the current exhaust temperature of the compressor, and the stable operation of the system is ensured; the value range of to is 20 s-30 s; wherein, if I the current exhaust temperature Td (n) -the exhaust temperature control target ToI is less than or equal To the exhaust threshold value beta; the regulating step number of the enthalpy-spraying electronic expansion valve is DeltaU (n) = [ (A+B) & lt (n) -A & lt (n-1) ] +C & lt DeltaT (n) -2 & lt (n-1) +DeltaT (n-2) ], and the result of DeltaU (n) is rounded to an integer, wherein A is a constant, and B is a constant; if I current exhaust temperature Td (n) -exhaust temperature control target ToI > exhaust threshold β; the regulating step number of the enthalpy-spraying electronic expansion valve is DeltaS (n) =A [ DeltaT (n) -A [ DeltaT (n-1) +C [ DeltaT (n) -2 [ DeltaT (n-1) +DeltaT (n-2) ], and the DeltaS (n) result is rounded to an integer, wherein C is a constant; wherein Δt (n) is the exhaust temperature deviation, Δt (n) =td (n) -To; td (n-1) is the exhaust temperature before 1 detection period, td (n-2) is the exhaust temperature before 2 detection periods, deltaT (n-1) is the exhaust temperature difference between the current time exhaust temperature Td (n) and the exhaust temperature before 1 detection period Td (n-1), deltaT (n-1) =Td (n-1) -To, deltaT (n-2) is the exhaust temperature difference between the current time exhaust temperature Td (n) and the exhaust temperature before 2 detection periods Td (n-2), deltaT (n-2) =Td (n-2) -To; dynamically adjusting the duration of the detection period according to the delta T (n), so that the compressor is fast and stable;
step 4): judging whether the condition of closing the enthalpy-spraying electronic expansion valve is met or not; if yes, closing the enthalpy-injection electronic expansion valve; if not, entering a step 3), and continuously adjusting the step number of the enthalpy-injection electronic expansion valve;
the conditions for closing the electronic expansion valve for enthalpy injection include: (1) the compressor is closed; (2) the compressor enters defrosting; (3) ambient temperature Ta is more than 13 ℃; and the electronic enthalpy-spraying expansion valve can be closed when any closing condition is met.
2. The low temperature heat pump enthalpy control method according to claim 1, characterized in that: the minimum opening degree of the electronic expansion valve for the enthalpy injection is 40 and the maximum opening degree of the electronic expansion valve for the enthalpy injection is 480.
3. The low temperature heat pump enthalpy control method according to claim 1, characterized in that: the value range of A is 3-10; b is a constant, and the value range of B is 0.1-10; c is a constant, and the value range of C is 2-15; the value range of the exhaust threshold value beta is 8-15 ℃.
4. The low temperature heat pump enthalpy control method according to claim 1, characterized in that: the value range of the detection period is 40 s-90 s; if the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is larger, the value of the detection period is smaller; if the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is larger, the detection period takes a larger value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135905.6A CN113758067B (en) | 2021-09-27 | 2021-09-27 | Enthalpy-spraying control method for low-temperature heat pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135905.6A CN113758067B (en) | 2021-09-27 | 2021-09-27 | Enthalpy-spraying control method for low-temperature heat pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113758067A CN113758067A (en) | 2021-12-07 |
| CN113758067B true CN113758067B (en) | 2023-04-28 |
Family
ID=78797828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111135905.6A Active CN113758067B (en) | 2021-09-27 | 2021-09-27 | Enthalpy-spraying control method for low-temperature heat pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113758067B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322369B (en) * | 2021-12-17 | 2024-03-12 | 深圳市深蓝电子股份有限公司 | Air source heat pump system, control method, computer device, and storage medium |
| CN114719435B (en) * | 2022-03-30 | 2023-12-08 | 浙江中广电器集团股份有限公司 | Control method of heat pump water heater using jet enthalpy-increasing compressor |
| CN114739047B (en) * | 2022-04-26 | 2024-04-02 | 浙江中广电器集团股份有限公司 | Heat pump water heater and control method for exhaust temperature of compressor of heat pump water heater |
| CN115077131B (en) * | 2022-04-29 | 2024-07-05 | 浙江中广电器集团股份有限公司 | Air source heat pump system with economizer and exhaust gas temperature control method |
| CN114992803B (en) * | 2022-05-30 | 2024-07-09 | 青岛海尔空调电子有限公司 | Control method and device for air supplementing and enthalpy increasing of heat pump air conditioner and heat pump air conditioner |
| CN115371302B (en) * | 2022-07-14 | 2024-04-19 | 浙江中广电器集团股份有限公司 | Control method for enthalpy injection control of heat pump EVI multi-split refrigeration mode |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100531296B1 (en) * | 2003-08-01 | 2005-11-28 | 엘지전자 주식회사 | method for controlling system in air conditioner |
| CN109668274B (en) * | 2018-12-20 | 2021-09-28 | 广东Tcl智能暖通设备有限公司 | Liquid-jet electronic expansion valve control method, air conditioner and readable storage medium |
| CN110195925A (en) * | 2019-05-31 | 2019-09-03 | 宁波奥克斯电气股份有限公司 | A kind of control method and air conditioner of low-temperature air source heat pump spray enthalpy valve |
| CN111442504B (en) * | 2020-04-10 | 2021-12-07 | 广东美的制冷设备有限公司 | Operation method and device of air conditioner, air conditioner and readable storage medium |
| CN113251515A (en) * | 2021-04-13 | 2021-08-13 | 广东Tcl智能暖通设备有限公司 | Enthalpy-injection compressor air conditioning system and control method thereof |
-
2021
- 2021-09-27 CN CN202111135905.6A patent/CN113758067B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113758067A (en) | 2021-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113758067B (en) | Enthalpy-spraying control method for low-temperature heat pump | |
| CN109282545B (en) | Air-supplying and enthalpy-increasing control method of low-temperature direct-current variable-frequency heat pump system | |
| US4495779A (en) | Air conditioner | |
| CN110715466A (en) | Multi-connected air conditioning system and control method thereof | |
| CN108562077B (en) | Stable enthalpy increasing method | |
| CN111023458B (en) | Electronic expansion valve control method for prolonging frosting period and air conditioner | |
| CN105371545A (en) | An air conditioner and a refrigerant circulation quantity adjusting method for a refrigeration system thereof | |
| CN107990579B (en) | Refrigerating system, refrigerator with refrigerating system and control method of refrigerating system | |
| CN110057044B (en) | Condensation removing control method for electric auxiliary heating of air conditioner and air conditioner | |
| EP2734798A1 (en) | Defrost for transcritical vapor compression system | |
| CN106931545B (en) | Heat pump enthalpy-spraying system, control method thereof and air conditioner | |
| CN109945455B (en) | Control method of air conditioner, air conditioner and storage medium | |
| CN113883744B (en) | Control method for water chilling unit | |
| CN215523840U (en) | Multi-loop refrigeration system and refrigerator | |
| CN114992889A (en) | Cascade heat pump system and control method thereof | |
| CN112178965B (en) | Qi tonifying regulation method | |
| CN111678240B (en) | Operation control method of air conditioner, air conditioner and readable storage medium | |
| CN114739047B (en) | Heat pump water heater and control method for exhaust temperature of compressor of heat pump water heater | |
| CN105783137A (en) | Control method of cold-warm type air conditioner | |
| CN115264922A (en) | Air conditioner | |
| CN111219818B (en) | Air conditioning system, air conditioner and control method of air conditioner | |
| WO2017185517A1 (en) | Cooling and heating air conditioner, cooling-only air conditioner, and control method for air conditioner | |
| CN105783323A (en) | Cold-warm type air conditioner and controlling method thereof | |
| CN217979374U (en) | Enhanced vapor injection control system of electronic expansion valve | |
| KR20050076248A (en) | Structure for controlling degree of induction superheat and method for controlling degree of induction superheat in compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 323000 No. 96, Yunjing Road, Shuige Industrial Zone, Lishui City, Zhejiang Province Applicant after: Zhejiang Zhongguang Electric Appliance Group Co.,Ltd. Address before: 323000 No. 96, Yunjing Road, Shuige Industrial Zone, Lishui City, Zhejiang Province Applicant before: ZHEJIANG ZHONGGUANG ELECTRIC APPLIANCES Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |