CN113639493B - Module control method of low-temperature air source heat pump system - Google Patents
Module control method of low-temperature air source heat pump system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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Abstract
The invention discloses a module control method of a low-temperature air source heat pump system, belongs to the technical field of low-temperature air source heat pumps, and is designed for solving the problems of compressor failure and the like caused by frequent start and stop of the conventional unit. The module control method of the low-temperature air source heat pump system comprises the steps that in a loading stage, a maintaining stage, an unloading stage and an emergency stop stage, starting and loading of the low-temperature air source heat pump unit are controlled independently, the value of a starting return difference Tdt is not related to the value of a loading return difference Tld, and the loading return difference Tld is corrected at least in the loading stage. The module control method of the low-temperature air source heat pump system can reduce the starting and stopping times of all energy levels of the unit, enables the unit to run more efficiently, prolongs the service life of the unit, improves the running stability and reliability of the unit, and enables the compressor to be more energy-saving and efficient; the range of the loading stage can be enlarged, so that the unit control is more stable.
Description
Technical Field
The invention relates to the technical field of low-temperature air source heat pumps, in particular to a module control method of a low-temperature air source heat pump system and the low-temperature air source heat pump system for executing the module control method.
Background
Because the functions and the working principle are similar, the existing modular control of the low-temperature air source heat pump mainly adopts the control mode and the technical route of a normal-temperature air conditioner module machine.
However, the low-temperature air source heat pump mainly uses heating, the span of the use environment is large, and the change of the environmental temperature is so great as to influence the heating capacity of the unit; the conventional air conditioning module machine mainly performs refrigeration, the service environment span is small, the main influence of the change of the environment temperature is the energy efficiency ratio of the unit, and the change of the refrigerating capacity is small, so that the conventional modular control of the low-temperature air source heat pump has the defect of large size.
Specifically, in the existing modular control of the low-temperature air source heat pump, the start return difference and the load return difference are the same parameter point, that is, the start return difference = the load return difference. When the parameter setting is large (for example, 5 ℃), the unit is set to be 45 ℃, one unit is started initially, the water temperature of the unit enters a holding area (for example, 41 ℃), the unit is not loaded any more, and the operation requirement of the unit does not reach the design requirement. When the set parameters of the unit are relatively small (for example, 2 ℃), the situation that the unit needs to be unloaded after loading one energy level and needs to be loaded after unloading often occurs, namely, part of the unit is in a frequent start-stop state, so that liquid impact faults caused by liquid loading of a compressor are caused, the operation energy-saving effect of the unit is influenced, and the service life of the unit is prolonged; in addition, the short startup time of the unit can cause that the system circulation is not completely established, the compressor continuously runs with liquid, and the unit directly breaks down and cannot be started up when the compressor is accumulated to a certain degree.
Disclosure of Invention
The invention aims to provide a module control method of a low-temperature air source heat pump system, which is stable in operation and solves the problem that a unit is frequently started and stopped in the prior art.
Another object of the present invention is to provide a low-temperature air source heat pump system which operates smoothly.
To achieve the purpose, on one hand, the invention adopts the following technical scheme:
a module control method of a low-temperature air source heat pump system is characterized in that in a loading stage, a maintaining stage, an unloading stage and an emergency stop stage, starting and loading of the low-temperature air source heat pump unit are controlled independently, a value of a starting return difference Tdt is not related to a value of a loading return difference Tld, and the loading return difference Tld is corrected at least in the loading stage.
Particularly, after the low-temperature air source heat pump system loads an energy level, timing is started, and when the timing duration when the unloading stage entering instruction is received is less than a first set Time Tzf, the loading return difference Tld is corrected, and the corrected loading return difference Tld2= (Tzf + 1) × Tld/Time1, wherein Time1 is the actual running duration after timing.
In particular, the first set time Tzf ∈ [18 minutes, 22 minutes ].
Particularly, the module control method further comprises a second set time Tzs, wherein Tzs is larger than Tzf, and when the timing of the low-temperature air source heat pump system after being loaded with one energy level exceeds the second set time Tzs, the loading return difference Tld is not corrected any more.
In particular, the second set time Tzs ∈ [23 min, 27 min ].
Particularly, the return water temperature Tin of the system is obtained through measurement, a target temperature Tset and a heating return difference Tdt are set, delta T = Tset-Tin, and-delta T = Tin-Tset; when the delta T is larger than the Tdt, starting the low-temperature air source heat pump system, and starting the number of compressors at initial startup, wherein the Cmax is the total number of the compressors in the low-temperature air source heat pump system, and the Tmax is the difference between the target temperature Tset and the return water temperature Tin when the compressors are required to be fully opened.
In particular, the loading phase is entered when Δ T > Tld, and the holding phase is entered when Δ T ≦ Tld; tuld is unloading return difference, the unloading stage is entered when-DeltaT is less than Tuld, and the emergency stop stage is entered when-DeltaT is more than or equal to Tuld.
Particularly, when Tmax is larger than Tdt, the pre-opening quantity proportion of the compressor at the initial startup is Tdt/Tmax; when Tmax is less than Tdt, all the compressors are started at the initial startup.
Particularly, when the module control method is in the loading stage, loading an energy level every other energy control period until all the energy is loaded; maintaining a current energy level when the module control method is in the maintenance phase; when the module control method is in the unloading stage, unloading one energy level every other energy control period until all the energy is unloaded; and unloading one energy level every preset time when the module control method is in the emergency stop stage.
On the other hand, the invention adopts the following technical scheme:
a low-temperature air source heat pump system comprises an indoor unit and at least two low-temperature air source heat pumps, wherein one of the at least two low-temperature air source heat pumps serves as a host, the other low-temperature air source heat pumps serve as slaves, a controller is arranged on the host, the controller is respectively in communication connection with all the slaves, and the low-temperature air source heat pump system executes the module control method of the low-temperature air source heat pump system.
According to the module control method of the low-temperature air source heat pump system, the starting and loading of the unit are respectively and independently controlled through the starting return difference and the loading return difference of the separating unit, the starting and stopping times of all energy levels of the unit can be reduced, the unit can run more efficiently, the service life of the unit is prolonged, the problem that the temperature difference between a keeping stage and a target temperature is too large is solved, the running stability and the reliability of the unit are improved, the compressor is more energy-saving and efficient, and the user experience is good; the range of the loading stage can be enlarged, so that the unit control is more stable. In addition, the loading return difference Tld is corrected, so that the unit can save more energy and operate more reliably when the unit is in response to the change of the environmental temperature or the change of the tail end heat load requirement, and the influence on the service life of the unit and the system fault are further reduced.
The low-temperature air source heat pump system executes the module control method of the low-temperature air source heat pump system, can solve the problem of liquid hammer failure caused by liquid accumulation of a compressor due to frequent start and stop of a unit in the prior art, can enlarge the range of a loading stage, and improves the operation stability and reliability of the unit.
Drawings
FIG. 1 is a schematic diagram of a cryogenic air source heat pump system according to an embodiment of the present invention;
FIG. 2 illustrates four phases of a modular control method for a cryogenic air source heat pump system according to an embodiment of the present invention;
fig. 3 illustrates steps of a module control method of a cryogenic air source heat pump system according to an embodiment of the present invention.
In the figure:
100. an indoor unit; 201. a host; 202. a slave; 300. a controller; 400. a water pump; 501. an effluent temperature detector; 502. a backwater temperature detector.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the 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 at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated 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 formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The embodiment provides a low-temperature air source heat pump system and a module control method thereof. As shown in fig. 1, the low-temperature air-source heat pump system includes an indoor unit 100, at least two low-temperature air-source heat pumps, and a controller 300. One of the at least two low-temperature air source heat pumps serves as a master 201, and the other low-temperature air source heat pumps serve as slaves 202. The controller 300 is arranged on the master machine and is respectively connected to all slave machines 202 in a communication mode and used for controlling the operation of all the low-temperature air source heat pumps.
All low-temperature air source heat pumps are connected in parallel, and a water pump 400 is arranged on the main water outlet pipeline and used for increasing the water flow speed. A water outlet temperature detector 501 is also arranged on the main water outlet pipeline and is used for measuring the water temperature in the main water outlet pipeline; a return water temperature detector 502 is provided on the total return water pipeline for measuring the temperature of water in the total return water pipeline.
When the ambient temperature changes, the heat load required by the building and the heating capacity generated by the units change. Specifically, as the ambient temperature decreases, the thermal load demand of the building increases and the heating capacity of the units decreases, at which time the units are loaded to a maximum. Because the loading and unloading running time is long, the starting and stopping times of the unit are few at the moment, and the unit is not influenced.
When the ambient temperature rises, the heat load of the building is reduced, the heating capacity of the units is increased, and the adjustment ratio of a single unit to the whole system is increased. Once the set heating return difference or the set loading return difference is small, the conditions that the unit needs to be unloaded after loading an energy level and then needs to be loaded easily occur, so that the unit needs to be started and stopped frequently, the service life and the reliability of the piping are influenced, the initial state of the unit is worse and worse, and the energy consumption is increased rapidly; and moreover, the starting time of the low-temperature air source heat pump unit is too short, so that the system circulation is not completely established, the compressor continuously runs with liquid, and the unit directly breaks down and cannot be started up when the compressor is accumulated to a certain degree.
In order to solve the above problem, as shown in fig. 2 and 3, the module control method executed by the low-temperature air source heat pump system is as follows: in the loading stage, the maintaining stage, the unloading stage and the emergency stop stage, the starting and the loading of the low-temperature air source heat pump unit are respectively and independently controlled, the value of the starting return difference Tdt is not related to the value of the loading return difference Tld, and the loading return difference Tld is corrected at least in the loading stage. Here, "not associated" means that the value of the starting back difference Tdt and the value of the loading back difference Tld are no longer required to be equal, even if the final result in a certain application is that the value of the starting back difference Tdt is equal to the value of the loading back difference Tld, which is also an accidental event, unlike the prior art method of directly setting the value of the starting back difference Tdt to be equal to the value of the loading back difference Tld.
The module control method enables the unit to be started and loaded independently by separating the starting return difference and the loading return difference of the unit, can reduce the starting and stopping times of all energy levels of the unit, enables the unit to run more efficiently and prolongs the service life of the unit, solves the problem of overlarge temperature difference between a keeping stage and a target temperature, improves the running stability and reliability of the unit, and is more energy-saving and efficient for a compressor and good in user experience; the range of the loading stage can be enlarged, so that the unit control is more stable. In addition, the loading return difference Tld is corrected, so that the unit can save more energy and operate more reliably when the unit is in response to the change of the environmental temperature or the change of the tail end heat load requirement, and the influence on the service life of the unit and the system fault are further reduced.
The specific method for correcting the load return difference Tld is not limited, and the load return difference Tld can be corrected according to the change of the environment temperature or the change of the tail end heat load requirement. In this implementation, the method preferably starts timing after the low-temperature air source heat pump system loads an energy level, and corrects the loading return difference Tld when the timing duration when an instruction for entering the unloading stage is received is less than a first set Time Tzf, where the corrected loading return difference Tld2= (Tzf + 1) × Tld/Time1, where Time1 is the actual running duration after timing, and Tzf +1 ensures the unit correction margin.
The loading return difference Tld is corrected by taking the first set time Tzf as a parameter, the number of times of starting and stopping the unit can be reduced, and the compressor can be ensured to reach a stable stage in each operation, so that a virtuous circle is formed, the fault rate of the unit is reduced, the operation stability of the unit is improved, and the service life of the unit is prolonged. And the starting and the stopping of the compressor are only carried out individually, the adjusting proportion of a single unit is increased when the environmental temperature and the room load are changed, the compressor is prevented from being started and stopped frequently under the condition of not influencing the normal use, and the service life of the compressor is prolonged.
The stable operation of the low-temperature air source heat pump unit generally needs three stages: in the initial stage, the time lasts for about 3 minutes, the opening of the electronic expansion valve is large in the initial stage, a motor of the motor is protected from being damaged, and the normal starting of the unit is ensured; in the adjusting stage, the duration is about 7-10 minutes, and PID adjustment is carried out on real-time feedback of the superheat degree through a unit; the unit then undergoes a stabilization phase. Once the unit is stopped without entering the stable stage, the next start-up is badly affected, and particularly, the unit system falls into a vicious circle in a frequent start-up and stop state.
In order to solve the above problem, the first set Time Tzf ∈ [18 minutes, 22 minutes ], preferably 19 minutes, 20 minutes, and 21 minutes, and when it is judged whether Time1 < Tzf in fig. 3, tzf is directly written as 20 minutes. The low-temperature air source heat pump system can reach a stable state, the starting and stopping times are reduced, and negative effects on next starting are avoided.
On the basis of the above, the module control method further includes a second set time Tzs, tzs > Tzf. And when the timing of the low-temperature air source heat pump system after loading an energy level exceeds a second set time Tzs, the loading return difference Tld is not corrected any more. Wherein the second set time Tzs ∈ [23 minutes, 27 minutes ], is preferably 24 minutes, 25 minutes, and 26 minutes.
On the basis of the above, the number of compressors at the initial start-up can be calculated. Specifically, the system backwater temperature Tin is obtained through measurement, specific numerical values of the target temperature Tset and the heating return difference Tdt are set, and the delta T = Tset-Tin and the-delta T = Tin-Tset are set. When the delta T is larger than the Tdt, the low-temperature air source heat pump system is started, the number of the compressors at the initial startup is Nneed = delta T multiplied by Cmax/Tmax, wherein Cmax is the total number of the compressors in the low-temperature air source heat pump system, and Tmax is the difference value between the target temperature Tset and the return water temperature Tin when the compressor is required to be fully opened. Wherein Tset, tdt and Tmax are set parameter values, tin and Cmax are detection values, and specifically Cmax is the number of automatically detected online debugging confirmations. The number of the compressors required during initial startup is determined according to the delta T, the Cmax and the Tmax, so that the condition that the unit rapidly exceeds a set target and is suddenly stopped due to the detection precision of the sensor and the feedback delay can be effectively avoided, and the problem of frequent start and stop of the unit is further solved. After the unit is started, whether the unit needs to be loaded or not is determined according to the feedback of entering the normal temperature, and whether the unit enters a keeping stage, an unloading stage or an emergency stop stage or not is determined.
When Tmax is larger than Tdt, the pre-opening quantity proportion of the compressor at the initial start-up is Tdt/Tmax, or the percentage is Tdt/Tmax multiplied by 100%. The number of compressors to be put into service in a group can be determined by adjusting two parameters of Tmax and Tdt. After a starting command is issued, the low-temperature air source heat pump unit starts a part of compressors in sequence, then the initial stage is finished, and loading or unloading is carried out according to the requirement. When Tmax is less than Tdt, all compressors are started at the initial startup, and the scheme is not recommended because the scheme easily causes frequent start and stop of the unit.
After starting up, the unit can go through a loading stage, a holding stage, an unloading stage and an emergency stop stage. Tld is loading return difference, when delta T is larger than Tld, the loading stage is entered, and when delta T is smaller than or equal to Tld, the holding stage is entered. Tuld is unloading return difference, and enters an unloading stage when the delta T is less than Tuld, and enters an emergency stop stage when the delta T is more than or equal to Tuld.
When the module control method is in a loading stage, loading an energy level (a parameter of stepless operation of a compressor, representing the heating capacity or power level of a heat pump) every other energy control period until all energy is loaded; when the module control method is in the keeping stage, keeping the current energy level and not acting; when the module control method is in an unloading stage, unloading an energy level every other energy control period until all the energy is unloaded; when the module control method is in the scram phase, an energy level is unloaded every preset time (e.g., every 1 second).
It should be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A module control method of a low-temperature air source heat pump system is characterized in that in a loading stage, a maintaining stage, an unloading stage and an emergency stop stage, the starting and the loading of the low-temperature air source heat pump unit are respectively and independently controlled, the value of a starting return difference Tdt is not related to the value of a loading return difference Tld, and the loading return difference Tld is corrected at least in the loading stage;
and starting timing after the low-temperature air source heat pump system loads an energy level, correcting the loading return difference Tld when the timing duration when the unloading stage entering instruction is received is less than a first set Time Tzf, wherein the corrected loading return difference Tld2= (Tzf + 1) × Tld/Time1, and Time1 is the actual running duration after timing.
2. The module control method of a cryogenic air source heat pump system according to claim 1, characterized in that the first set time Tzf e [18 min, 22 min ].
3. The module control method of the low-temperature air source heat pump system according to claim 1, further comprising a second set time Tzs, tzs > Tzf, and when the time counted after the low-temperature air source heat pump system is loaded with an energy level exceeds the second set time Tzs, the loading return difference Tld is not corrected.
4. The module control method of a cryogenic air source heat pump system according to claim 3, characterized in that the second set time Tzs e [23 min, 27 min ].
5. The module control method of the low-temperature air source heat pump system according to any one of claims 1 to 4, wherein a system return water temperature Tin is obtained through measurement, a target temperature Tset and a heating return difference Tdt are set, and Δ T = Tset-Tin and- Δ T = Tin-Tset; when delta T is larger than Tdt, the low-temperature air source heat pump system is started, the number of compressors at initial startup is Nneed = delta T multiplied by Cmax/Tmax, wherein Cmax is the total number of compressors in the low-temperature air source heat pump system, and Tmax is the difference value between the target temperature Tset and the water return temperature Tin when the compressors are required to be fully started.
6. The module control method of a cryogenic air source heat pump system as claimed in claim 5, wherein the loading phase is entered when Δ T > Tld, and the holding phase is entered when Δ T ≦ Tld; tuld is unloading return difference, the unloading stage is entered when-Delta T is less than Tuld, and the emergency stop stage is entered when-Delta T is greater than or equal to Tuld.
7. The module control method of a low-temperature air source heat pump system according to claim 5, wherein when Tmax > Tdt, the ratio of the pre-start number of the compressors at the initial start-up is Tdt/Tmax; when Tmax is less than Tdt, all the compressors are started at the initial startup.
8. The module control method of a cryogenic air source heat pump system according to claim 5, wherein when the module control method is in the loading phase, every other energy control period is loaded with one energy level until all energy is loaded;
maintaining a current energy level when the module control method is in the maintenance phase;
when the module control method is in the unloading stage, unloading an energy level every other energy control period until all the energy is unloaded;
and unloading one energy level every preset time when the module control method is in the emergency stop stage.
9. A low-temperature air source heat pump system is characterized by comprising an indoor unit (100) and at least two low-temperature air source heat pumps, wherein one of the at least two low-temperature air source heat pumps is used as a master machine (201), the other low-temperature air source heat pumps are used as slave machines (202), a controller (300) is arranged on the master machine, the controller (300) is respectively in communication connection with all the slave machines (202), and the low-temperature air source heat pump system executes the module control method of the low-temperature air source heat pump system according to any one of claims 1 to 8.
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Address after: 510000 No. 125, CHUANGYOU Road, Xintang Town, Zengcheng, Guangzhou, Guangdong (in the core area of Zengcheng economic and Technological Development Zone) Patentee after: Guangdong Newente New Energy Technology Co.,Ltd. Country or region after: China Address before: No.125 CHUANGYOU Road, Xintang Town, Zengcheng, Guangzhou, Guangdong 511340 (in the core area of Zengcheng economic and Technological Development Zone) Patentee before: GUANGDONG NEW ENERGY TECHNOLOGY DEVELOPMENT Co.,Ltd. Country or region before: China |
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Denomination of invention: Module Control Method for Low Temperature Air Source Heat Pump System Granted publication date: 20230414 Pledgee: Agricultural Bank of China Limited Guangzhou Zengcheng Sub-branch Pledgor: Guangdong Newente New Energy Technology Co.,Ltd. Registration number: Y2024980016380 |