CN113758067A - Low-temperature heat pump spray enthalpy control method - Google Patents
Low-temperature heat pump spray enthalpy control method Download PDFInfo
- Publication number
- CN113758067A CN113758067A CN202111135905.6A CN202111135905A CN113758067A CN 113758067 A CN113758067 A CN 113758067A CN 202111135905 A CN202111135905 A CN 202111135905A CN 113758067 A CN113758067 A CN 113758067A
- Authority
- CN
- China
- Prior art keywords
- enthalpy
- temperature
- expansion valve
- electronic expansion
- exhaust temperature
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007921 spray Substances 0.000 title description 5
- 238000002347 injection Methods 0.000 claims abstract description 81
- 239000007924 injection Substances 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000010257 thawing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 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
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a method for controlling the injection enthalpy of a low-temperature heat pump, which comprises the following steps: step 1): the system is heated and started, and whether the enthalpy injection electronic expansion valve meets the opening condition is judged; step 2): if so, determining the initial opening degree of the enthalpy injection electronic expansion valve according to the ambient temperature and the water inlet temperature of the unit; step 3): after the enthalpy-injection electronic expansion valve keeps the current initial opening for a period of time, the control end controls and adjusts the step number of the enthalpy-injection electronic expansion valve according to the exhaust target temperature and the current exhaust temperature; step 4): and judging whether the conditions for closing the enthalpy injection electronic expansion valve are met. The enthalpy-spraying flow during the operation of the compressor is adjusted by controlling the opening degree of the enthalpy-spraying electronic expansion valve, so that the condition that the variation range of the exhaust temperature of the compressor is smaller in the starting process of the system is avoided, the exhaust temperature of the compressor can be stabilized in a shorter time, 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 control method for enthalpy of low-temperature heat pump spray.
Background
The application of the low-temperature air source heat pump technology in the fields of air conditioning, 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 spray liquid, high-temperature and high-pressure supercooled liquid is throttled and depressurized and then directly sprayed into an air suction port or a compressor medium-pressure interface, so that the heating capacity can be greatly improved, the exhaust temperature is reduced, and the running range of a unit is expanded; the other type is an economizer scheme, a plate heat exchanger or a flash evaporation cylinder is matched, a part of refrigerant is separated from a main path, and the refrigerant exchanges heat with the main path and evaporates in the economizer after throttling and then is sprayed into a compressor medium-pressure interface. Both modes may be collectively referred to as enthalpy injection. Because the low-temperature air source heat pump has a wide operation range, the enthalpy injection electronic expansion valves of part of manufacturers are unreasonably controlled, the exhaust temperature is fluctuated, and the system operation is unstable. Especially during start-up, the exhaust temperature oscillations fluctuate, which can lead to poor reliability of the overall system.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a low temperature heat pump injection enthalpy control method for solving the problem of system instability due to discharge temperature at the time of compressor start-up.
In order to achieve the purpose, the invention adopts the following technical scheme: the heating system comprises a control end, a user end and a heating end, the user end and the heating end carry out heat exchange through a heat exchanger, the heating end comprises a compressor with an enhanced vapor injection function, the control end controls the opening of an electronic expansion valve for controlling the vapor injection of the compressor, thereby controlling the flow of the vapor injection, achieving the purpose of controlling the exhaust temperature of the compressor, and further comprises an exhaust sensor for detecting the exhaust temperature of the compressor, an environment temperature sensor for detecting the environment temperature, a water temperature sensor for detecting the water inlet temperature entering the exchanger from the user side, and a control method of the vapor injection comprises the following steps:
step 1): the system is heated and started, and whether the enthalpy injection electronic expansion valve meets the opening condition is judged; the opening conditions of the enthalpy injection electronic expansion valve comprise: firstly, the temperature Ta of the environment is less than or equal to 12 ℃; the exhaust temperature Td is more than or equal to the exhaust temperature range set by the enthalpy starting; the enthalpy of spraying is started to set a temperature exhaust range of 45-50 ℃; thirdly, the exhaust temperature Td is more than 40 ℃; the enthalpy-injection electronic expansion valve can be opened when the opening condition is met;
step 2): if so, determining the initial opening degree of the enthalpy injection electronic expansion valve according to the ambient temperature and the water inlet temperature of the unit; if not, the enthalpy injection electronic expansion valve is not opened;
step 3): after the enthalpy injection electronic expansion valve keeps the current initial opening to time, the step number of the enthalpy injection electronic expansion valve is dynamically adjusted by the control end, and the step number of the enthalpy injection electronic expansion valve is determined according to the exhaust target temperature and the current exhaust temperature of the compressor, so that the stable operation of the system is ensured; the value range of to is 20 s-30 s;
step 4): judging whether the conditions for closing the enthalpy injection electronic expansion valve are met or not; if so, closing the enthalpy injection electronic expansion valve; if not, entering the step 3), and continuously adjusting the step number of the enthalpy injection electronic expansion valve; the closing condition of the enthalpy injection electronic expansion valve comprises the following conditions: firstly, closing a compressor; secondly, defrosting the compressor; and the ambient temperature Ta is more than 13 ℃. The enthalpy-injection electronic expansion valve can be closed when any one closing condition is met;
preferably, in step 2), the method for determining the initial opening degree of the enthalpy injection electronic expansion valve is as follows: the initial opening degree is 8 xtwin-6 xTa-180; wherein Ta is the ambient temperature, and the unit inlet water temperature is Twin.
Preferably, the opening degree of the enthalpy injection electronic expansion valve is minimum 40 and maximum 480. Therefore, the upper limit and the lower limit of the opening of the enthalpy-spraying electronic expansion valve are set, the condition that the enthalpy-spraying electronic expansion valve is opened is met, the flow of the spraying enthalpy is guaranteed not to be too large or too small, and the effectiveness of the spraying enthalpy is guaranteed.
Preferably, in step 3), if the current exhaust temperature td (n) -the exhaust temperature control target toi ≦ the exhaust threshold β; the enthalpy injection electronic expansion valve is adjusted by the steps of delta U (n) (A + B) × delta T (n) (-A × delta T (n-1)) + C [. DELTA T (n) -2 × delta T (n-1) +. DELTA T (n-2) ], and the result of delta U (n) is rounded off by an integer. If I is the current exhaust temperature Td (n) -exhaust temperature control target To I > exhaust threshold β; the adjusting step number of the enthalpy injection electronic expansion valve is DeltaS (n) ═ A DeltaT (n) — A DeltaT (n-1) + C [. DELTA.T (n) — 2 DeltaT (n-1) + DeltaT (n-2) ], and the result of DeltaS (n) is rounded up to an integer; where Δ t (n) is an exhaust temperature deviation, and Δ t (n) is td (n) -To; td (n-1) is an exhaust temperature before 1 detection period, Td (n-2) is an exhaust temperature before 2 detection periods, Δ T (n-1) is an exhaust temperature difference between an exhaust temperature Td (n) at the present time and an exhaust temperature Td (n-1) before 1 detection period, Δ T (n-1) ═ Td (n-1) -To, Δ T (n-2) is an exhaust temperature difference between an exhaust temperature Td (n) at the present time and an exhaust temperature Td (n-2) before 2 detection periods, Δ T (n-2) ═ Td (n-2) -To, a is a constant, B is a constant, and C is a constant. In this way, in the process of the operation of the compressor, as the temperature difference between the current exhaust temperature td (n) and the exhaust temperature control target To is gradually reduced, the opening degree of the enthalpy-injection electronic expansion valve is also gradually reduced, so that the compressor is always ensured To be stably operated after being started.
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 range of the exhaust threshold beta is 8-15 ℃. As such, the compressor tends to or is in a steady state within this temperature range.
Preferably, the detection period ranges from 40s to 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 value is larger. Therefore, under the condition that the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is large, the enthalpy injection electronic expansion valve performs high-frequency adjustment, and under the condition that the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is small, the enthalpy injection electronic expansion valve performs low-frequency adjustment, so that the system can be stably started To reach the set target.
Compared with the traditional technical scheme, the technical scheme of the invention adjusts the enthalpy-injection flow rate when the compressor operates by controlling the opening of the enthalpy-injection 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 of the system, such as poor heating effect, halt and the like, is reduced.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling enthalpy of injection of a low-temperature heat pump according to an embodiment of the present invention;
fig. 2 is a comparison diagram of peaks of the embodiment of the present invention with and without the technical solution of the present invention.
Reference numerals: 1. the variation 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 implementing the technical scheme.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
Fig. 1 shows a method for controlling enthalpy injection of a low-temperature heat pump, which is applied to a heating system, wherein the heating system comprises a control end, a user end, a heating end and a heat exchanger. The heating end comprises a compressor with an enhanced vapor injection function, and the control end controls the flow of the vapor injection by controlling the opening of an electronic expansion valve for vapor injection of the compressor, so as to achieve the purpose of controlling the exhaust temperature of the compressor; the user side exchanges heat with the heating end through the heat exchanger. The system also comprises an exhaust sensor for detecting the exhaust temperature of the compressor, an ambient temperature sensor for detecting the ambient temperature, and a water temperature sensor for detecting the water inlet temperature of the unit entering the exchanger from the user side.
The control method of the low-temperature heat pump spray enthalpy comprises the following steps:
step 1): the system is heated and started, and whether the enthalpy injection electronic expansion valve meets the opening regulation or not is judged;
step 2): if so, determining the initial opening degree of the enthalpy injection electronic expansion valve according to the environment temperature and the unit water inlet temperature, and entering the step 3); if not, the electronic expansion valve is not opened;
step 3): after the enthalpy injection electronic expansion valve keeps the current initial opening to time, the step number of the enthalpy injection electronic expansion valve is dynamically adjusted by the control end, and the step number of the enthalpy injection electronic expansion valve is determined according to the exhaust target temperature and the current exhaust temperature of the compressor, so that the stable operation of the system is ensured; the value range of to is 20 s-30 s;
step 4): judging whether the conditions for closing the enthalpy injection electronic expansion valve are met or not; if so, closing the enthalpy injection electronic expansion valve; if not, entering the step 3) and continuously adjusting the step number of the enthalpy injection electronic expansion valve.
In this embodiment, in step 1), the opening condition of the enthalpy injection electronic expansion valve includes: firstly, the temperature Ta of the environment is less than or equal to 12 ℃; secondly, the exhaust temperature Td is more than or equal to the enthalpy of injection, and the set exhaust temperature is started (the value range is 45-50 ℃); thirdly, the exhaust temperature Td is more than 40 ℃; and the enthalpy injection electronic expansion valve can be opened by meeting the conditions.
In this embodiment, in the step 2), the method for determining the initial opening of the enthalpy-injection electronic expansion valve includes: the initial opening degree is 8 xtwin-6 xTa-180; wherein Ta is the environment temperature, and the unit water inlet temperature is Twin; the opening degree of the enthalpy injection electronic expansion valve is minimum 40 and maximum 480; and if the calculation result is less than 40, taking 40, and if the calculation result is more than 480, taking the value as 480. So for guarantee the unit when guaranteeing steady operation accelerate the heating efficiency of unit.
In this embodiment, in the step 3), the adjustment step number of the enthalpy injection electronic expansion valve is determined as follows: Δ t (n) is an exhaust temperature deviation, Δ t (n) is td (n) -To, td (n) is an exhaust temperature at the present time, and To is an exhaust temperature control target; td (n-1) is the exhaust temperature before 1 detection period, and the exhaust temperature difference between the exhaust temperature Td (n) at the current moment and the exhaust temperature Td (n-1) before 1 detection period is delta T (n-1) -Td (n-1) -To; td (n-2) is the exhaust temperature before 2 detection periods, and the exhaust temperature difference between the exhaust temperature Td (n) at the current moment and the exhaust temperature Td (n-2) before 2 detection periods is as follows: Δ T (n-2) ═ Td (n-2) -To. The value range of the detection period is 40-90 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; like this, because among the prior art, can realize spouting fast regulation and the regulation slowly of enthalpy electronic expansion valve, guarantee the stable output of compressor in the operation process, avoid in low temperature environment because the too big compression and the unstability that leads to of the difference in temperature between exhaust temperature and the ambient temperature, improve the life of compressor, reduce the compressor energy consumption. In this embodiment, if the current exhaust temperature Td (n) -the exhaust temperature control target To is not greater than the exhaust threshold β (in the range of 8-15 ℃); the enthalpy injection electronic expansion valve is adjusted by the steps of delta U (n) (A + B) × delta T (n) (-A × delta T (n-1)) + C [. DELTA T (n) -2 × delta T (n-1) +. DELTA T (n-2) ], and the result of delta U (n) is rounded off by an integer. If the current exhaust temperature Td (n) -the exhaust temperature control target To > the exhaust threshold beta (range is 8-15 ℃); the enthalpy injection electronic expansion valve is adjusted to the step number of deltaS (n) ═ A deltaT (n) — A deltaT (n-1) + C [ -delta T (n) — 2 deltaT (n-1) + delta T (n-2) ], and the result of deltaS (n) 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 adjusting steps of the enthalpy injection electronic expansion valve are 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, under the condition that the detection periods are the same, if the temperature difference between the current exhaust temperature Td (n) and the exhaust temperature control target To is larger, the number of steps regulated by the enthalpy injection electronic expansion valve 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; so set up, can control the step number that the enthalpy-injection electronic expansion valve was adjusted within reasonable scope, guarantee the steady operation of compressor, guarantee the stable promotion of temperature.
In this embodiment, in the step 4), the closing condition of the enthalpy injection electronic expansion valve includes: firstly, closing a compressor; secondly, defrosting the compressor; ③ the ambient temperature Ta is more than 13 ℃; and the enthalpy injection electronic expansion valve can be closed when any one closing condition is met. Therefore, after the exhaust temperature Td and the ambient temperature Ta reach the target values, the enthalpy injection electronic expansion valve is closed, so that the energy consumption is reduced, and the purposes of energy conservation and emission reduction are achieved.
As shown in fig. 2, the operation time is shown in the horizontal direction in fig. 2, and the exhaust temperature, exhaust pressure, exhaust humidity, or the like may be shown in the vertical direction; in the curves in fig. 2, taking the variation curve 1 of the discharge temperature of the compressor when the technical scheme is not executed and the variation curve 2 of the discharge temperature of the compressor when the technical scheme is executed as an example, comparing the variation curve 1 of the discharge temperature of the compressor when the technical scheme is not executed with the variation curve 2 of the discharge temperature of the compressor when the technical scheme is executed, it can be seen that the discharge temperature of the compressor can quickly reach a stable state after the technical scheme is executed, so that it can be proved that the traditional technical scheme is distinguished, the scheme can make the compressor quickly stable, make the unit quickly warm up, and increase the reliability and the adaptability of the system.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (6)
1. The utility model provides a low temperature heat pump spouts enthalpy control method, be applied to heating system, heating system includes the control end, user side and heating end carry out the heat exchange through the heat exchanger, heating end is including the compressor that has the jet enthalpy function, the control end is through the aperture of the electronic expansion valve of the jet enthalpy of control compressor, thereby control and spout the enthalpy flow, reach the purpose of control compressor exhaust temperature, still include the exhaust sensor who is used for detecting compressor exhaust temperature, an ambient temperature sensor for detecting ambient temperature, a water temperature sensor for detecting the unit temperature of intaking that gets into the exchanger by the user side, the utility model is characterized in that: the enthalpy injection low-temperature heat pump control method comprises the following steps:
step 1): the system is heated and started, and whether the enthalpy injection electronic expansion valve meets the opening condition is judged; the opening conditions of the enthalpy injection electronic expansion valve comprise: firstly, the temperature Ta of the environment is less than or equal to 12 ℃; the exhaust temperature Td is more than or equal to the exhaust temperature range set by the enthalpy starting; the enthalpy of spraying is started and the set exhaust temperature range is 45-50 ℃; thirdly, the exhaust temperature Td is more than 40 ℃; the enthalpy-injection electronic expansion valve can be opened when the opening condition is met;
step 2): if so, determining the initial opening degree of the enthalpy injection electronic expansion valve according to the ambient temperature and the water inlet temperature of the unit; if not, the enthalpy injection electronic expansion valve is not opened;
step 3): after the enthalpy injection electronic expansion valve keeps the current initial opening to time, the step number of the enthalpy injection electronic expansion valve is dynamically adjusted by the control end, and the step number of the enthalpy injection electronic expansion valve is determined according to the exhaust target temperature and the current exhaust temperature of the compressor, so that the stable operation of the system is ensured; the value range of to is 20 s-30 s;
step 4): judging whether the conditions for closing the enthalpy injection electronic expansion valve are met or not; if so, closing the enthalpy injection electronic expansion valve; if not, entering the step 3) and continuously adjusting the step number of the enthalpy injection electronic expansion valve. The closing condition of the enthalpy injection electronic expansion valve comprises the following conditions: firstly, closing a compressor; secondly, defrosting the compressor; ③ the ambient temperature Ta is more than 13 ℃; the enthalpy-injection electronic expansion valve can be closed when any one closing condition is met.
2. The enthalpy control method for a low-temperature heat pump according to claim 1, characterized in that: in the step 2), the method for determining the initial opening of the enthalpy injection electronic expansion valve comprises the following steps: the initial opening degree is 8 xtwin-6 xTa-180; wherein Ta is the ambient temperature, and the unit inlet water temperature is Twin.
3. The enthalpy control method for a low-temperature heat pump according to claim 1, characterized in that: the opening degree of the enthalpy injection electronic expansion valve is minimum 40 and maximum 480.
4. The enthalpy control method for a low-temperature heat pump according to claim 1, characterized in that: in step 3), if the current exhaust temperature Td (n) -the exhaust temperature control target To is not more than the exhaust threshold beta; the enthalpy injection electronic expansion valve has the following adjusting steps:
(n) [ (a + B) × Δ T (n) — a × Δ T (n-1) ] + C [ < Δ T (n) -2 × Δ T (n-1) + Δt (n-2) ], (Δ u (n)) the result is rounded off by a whole number, where a is a constant and B is a constant; if I is the current exhaust temperature Td (n) -exhaust temperature control target To I > exhaust threshold β; the enthalpy injection electronic expansion valve is adjusted to have the step number of deltaS (n) ═ A deltaT (n) — A deltaT (n-1) + C [ -delta T (n) — 2 deltaT (n-1) + delta T (n-2) ], and the result of deltaS (n) is rounded off to be an integer, wherein C is a constant; where Δ t (n) is an exhaust temperature deviation, and Δ t (n) is td (n) -To; td (n-1) is an exhaust temperature before 1 detection period, Td (n-2) is an exhaust temperature before 2 detection periods, Δ T (n-1) is an exhaust temperature difference between an exhaust temperature Td (n) at the present time and an exhaust temperature Td (n-1) before 1 detection period, Δ T (n-1) ═ Td (n-1) -To, Δ T (n-2) is an exhaust temperature difference between an exhaust temperature Td (n) at the present time and an exhaust temperature Td (n-2) before 2 detection periods, and Δ T (n-2) ═ Td (n-2) -To.
5. The enthalpy control method for a low-temperature heat pump according to claim 4, 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 beta is 8-15 ℃.
6. The enthalpy control method for a low-temperature heat pump according to claim 4, characterized in that: the value range of the detection period is 40-90 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 value is larger.
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 true CN113758067A (en) | 2021-12-07 |
| CN113758067B 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) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322369A (en) * | 2021-12-17 | 2022-04-12 | 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 |
| CN114719435A (en) * | 2022-03-30 | 2022-07-08 | 浙江中广电器集团股份有限公司 | Control method of heat pump water heater using enhanced vapor injection compressor |
| CN114739047A (en) * | 2022-04-26 | 2022-07-12 | 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 thereof |
| CN114992803A (en) * | 2022-05-30 | 2022-09-02 | 青岛海尔空调电子有限公司 | Control method and device for air supply and enthalpy increase of heat pump air conditioner and heat pump air conditioner |
| CN115077131A (en) * | 2022-04-29 | 2022-09-20 | 浙江中广电器集团股份有限公司 | Air source heat pump system with economizer and exhaust temperature control method |
| CN115371302A (en) * | 2022-07-14 | 2022-11-22 | 浙江中广电器集团股份有限公司 | Control method for EVI multi-split refrigeration mode enthalpy injection control of heat pump |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050022544A1 (en) * | 2003-08-01 | 2005-02-03 | Sim-Won Chin | Method for controlling operation of air conditioning system |
| CN109668274A (en) * | 2018-12-20 | 2019-04-23 | 广东Tcl智能暖通设备有限公司 | Hydrojet control method for electronic expansion valve, air conditioner and readable storage medium storing program for executing |
| 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 |
| CN111442504A (en) * | 2020-04-10 | 2020-07-24 | 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
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050022544A1 (en) * | 2003-08-01 | 2005-02-03 | Sim-Won Chin | Method for controlling operation of air conditioning system |
| CN109668274A (en) * | 2018-12-20 | 2019-04-23 | 广东Tcl智能暖通设备有限公司 | Hydrojet control method for electronic expansion valve, air conditioner and readable storage medium storing program for executing |
| 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 |
| CN111442504A (en) * | 2020-04-10 | 2020-07-24 | 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 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322369A (en) * | 2021-12-17 | 2022-04-12 | 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 |
| 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 |
| CN114719435A (en) * | 2022-03-30 | 2022-07-08 | 浙江中广电器集团股份有限公司 | Control method of heat pump water heater using enhanced vapor injection compressor |
| 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 |
| CN114739047A (en) * | 2022-04-26 | 2022-07-12 | 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 thereof |
| 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 |
| CN115077131A (en) * | 2022-04-29 | 2022-09-20 | 浙江中广电器集团股份有限公司 | Air source heat pump system with economizer and exhaust temperature control method |
| CN114992803A (en) * | 2022-05-30 | 2022-09-02 | 青岛海尔空调电子有限公司 | Control method and device for air supply and enthalpy increase of heat pump air conditioner and heat pump air conditioner |
| CN115371302A (en) * | 2022-07-14 | 2022-11-22 | 浙江中广电器集团股份有限公司 | Control method for EVI multi-split refrigeration mode enthalpy injection control of heat pump |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113758067B (en) | 2023-04-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113758067A (en) | Low-temperature heat pump spray enthalpy control method | |
| CN109282545B (en) | Air-supplying and enthalpy-increasing control method of low-temperature direct-current variable-frequency heat pump system | |
| US11326805B2 (en) | Control method for air conditioning system | |
| CN108562077B (en) | Stable enthalpy increasing method | |
| CN110715466A (en) | Multi-connected air conditioning system and control method thereof | |
| CN110513903B (en) | Control method of refrigeration cycle system | |
| CN108603709B (en) | Method for controlling a fan of a vapour compression system according to a variable temperature set point | |
| CN111023458B (en) | Electronic expansion valve control method for prolonging frosting period and air conditioner | |
| CN104633942A (en) | Frequency adjusting and control method for variable-frequency enhanced vapor injection heat-pump water heater | |
| WO2013012523A1 (en) | Defrost for transcritical vapor compression system | |
| CN107401806A (en) | Main frame and refrigerating water pump comprehensive energy efficiency lifting control method in central air conditioning freezing station | |
| CN107461970B (en) | Control method of water chilling unit with evaporative condenser | |
| CN215523840U (en) | Multi-loop refrigeration system and refrigerator | |
| CN113405275A (en) | Air supplementing and enthalpy increasing control system and control method of ultralow-temperature air-cooled modular machine | |
| CN110243115B (en) | Condensing pressure control system and method | |
| CN114739047B (en) | Heat pump water heater and control method for exhaust temperature of compressor of heat pump water heater | |
| CN113883744B (en) | Control method for water chilling unit | |
| CN115264946A (en) | Control method and device of heat pump water heater and storage medium | |
| CN212274309U (en) | Refrigerator car and refrigerating system thereof | |
| JP2701598B2 (en) | Freezer refrigerator | |
| CN112344511A (en) | Control method, device and system suitable for machine room air conditioner refrigerant flow | |
| CN111595047A (en) | Refrigerating system of refrigerator car and control method thereof | |
| KR100628149B1 (en) | structure for controlling degree of induction superheat and method for controlling degree of induction superheat in compressor | |
| JP2008209016A (en) | Cooling system | |
| WO2017185516A1 (en) | Control method for cooling-heating type air conditioner and control method for cooling-only type air conditioner |
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 |