WO2021082202A1 - 一种热泵系统的水温控制方法及热泵系统 - Google Patents

一种热泵系统的水温控制方法及热泵系统 Download PDF

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Publication number
WO2021082202A1
WO2021082202A1 PCT/CN2019/124778 CN2019124778W WO2021082202A1 WO 2021082202 A1 WO2021082202 A1 WO 2021082202A1 CN 2019124778 W CN2019124778 W CN 2019124778W WO 2021082202 A1 WO2021082202 A1 WO 2021082202A1
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Prior art keywords
compressor
current
energy level
temperature difference
water temperature
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Ceased
Application number
PCT/CN2019/124778
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English (en)
French (fr)
Inventor
刘志力
吴思朗
叶景发
李操炫
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Guangdong PHNIX Eco Energy Solution Ltd
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Guangdong PHNIX Eco Energy Solution Ltd
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Priority to EP19934332.8A priority Critical patent/EP3845818B1/en
Publication of WO2021082202A1 publication Critical patent/WO2021082202A1/zh
Anticipated expiration legal-status Critical
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    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F24H15/175—Supplying heated water with desired temperature or desired range of temperature where the difference between the measured temperature and a set temperature is kept under a predetermined value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/375—Control of heat pumps
    • F24H15/38—Control of compressors of 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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
    • 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
    • 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
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F24D19/1054—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water 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
    • 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
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F24D19/1072—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • F24D2200/123—Compression type heat pumps
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/042—Temperature sensors
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B2500/19—Calculation of parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21161—Temperatures of a condenser of the fluid heated by the condenser
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
    • Y02A40/963—Off-grid food refrigeration
    • 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

Definitions

  • This application relates to the field of heat pump technology, and in particular to a water temperature control method of a heat pump system and a heat pump system.
  • heat pump heating projects mostly use primary or secondary pump systems based on actual site conditions. Compared with secondary pump systems, primary pump systems do not have secondary pumps and energy storage tanks, saving secondary pump operating costs and engineering. There are obvious advantages in installation costs.
  • the inventor of the present application found in research that because the primary pump system uses a fixed-frequency heat pump, whenever the terminal load changes, the device cannot adapt to the terminal load change, resulting in large fluctuations in the outlet water temperature.
  • This application provides a water temperature control method for a heat pump system and a heat pump system to solve the technical problem that the outlet temperature of the existing primary pump system equipment fluctuates due to changes in the terminal load.
  • This application can realize the adaptation of the equipment to changes in the terminal load. , After the end changes, the output water temperature can be dynamically adjusted to keep the water temperature constant and improve the performance of the primary heat pump system.
  • an embodiment of the present application provides a water temperature control method for a heat pump system.
  • the heat pump system includes an equipment end, an end, and a water pump arranged on a pipeline between the equipment end and the end.
  • the equipment end has a variable frequency compressor heat pump; the water temperature control method includes at least the following steps:
  • the current compressor energy level gear is determined according to the current outlet water temperature difference, and the current compressor frequency corresponding to the current compressor energy level gear is obtained from a preset energy level gear table, and the current compressor frequency is used for control The compressor of the inverter compressor heat pump.
  • EL is the current compressor energy level gear of the compressor
  • A is the coefficient
  • B is the preset energy level gain
  • C is the accumulated value
  • the step of determining the current compressor energy level gear according to the current outlet water temperature difference is specifically as follows:
  • the current compressor energy level gear is determined according to the current outlet water temperature difference; wherein the interval between two adjacent preset time nodes is ⁇ t.
  • the method further includes:
  • the current compressor frequency is used to control the frequency up or down of the compressor of the inverter compressor heat pump.
  • the lower limit threshold of the preset temperature difference threshold value range is a set temperature difference negative threshold value
  • the upper threshold value is a set temperature difference positive threshold value
  • the current compressor energy level is re-determined as the new energy level according to the current outlet temperature difference, and the current compressor energy level is determined to be at the preset energy level. Re-acquire the current compressor frequency corresponding to the new energy level gear in the gear table to control the compressor frequency increase of the inverter compressor heat pump;
  • the current compressor energy level is re-determined as the new energy level according to the current outlet temperature difference, and the preset energy level is The current compressor frequency corresponding to the new energy-level gear is retrieved from the gear table to control the compressor frequency reduction of the inverter compressor heat pump.
  • the application also provides a heat pump system.
  • the heat pump system includes a centralized controller, an equipment end, an end, and a water pump arranged on a pipeline between the equipment end and the end, and the equipment end has a variable frequency compressor heat pump;
  • the centralized controller is configured to:
  • the current compressor energy level gear is determined according to the current outlet water temperature difference, and the current compressor frequency corresponding to the current compressor energy level gear is obtained from a preset energy level gear table, and the current compressor frequency is used for control The compressor of the inverter compressor heat pump.
  • EL is the current compressor energy level gear of the compressor
  • A is the coefficient
  • B is the preset energy level gain
  • C is the accumulated value
  • the centralized controller is further configured to:
  • the current compressor energy level gear is determined according to the current outlet water temperature difference; wherein the interval between two adjacent preset time nodes is ⁇ t.
  • the centralized controller is further configured to:
  • the current compressor frequency is used to control the frequency up or down of the compressor of the inverter compressor heat pump.
  • the lower limit threshold of the preset temperature difference threshold value range is a set temperature difference negative threshold value
  • the upper threshold value is a set temperature difference positive threshold value
  • the centralized controller is also configured to:
  • the current compressor energy level is re-determined as the new energy level according to the current outlet temperature difference, and the current compressor energy level is determined to be at the preset energy level. Re-acquire the current compressor frequency corresponding to the new energy level gear in the gear table to control the compressor frequency increase of the inverter compressor heat pump;
  • the current compressor energy level is re-determined as the new energy level according to the current outlet temperature difference, and the preset energy level is The current compressor frequency corresponding to the new energy-level gear is retrieved from the gear table to control the compressor frequency reduction of the inverter compressor heat pump.
  • the embodiments of the present application provide a water temperature control method for a heat pump system and a heat pump system.
  • the beneficial effect of any of the embodiments is that by adopting a variable frequency compressor heat pump device at the equipment end, it replaces the existing fixed frequency
  • the heat pump enables the frequency of the compressor at the equipment end to be adjusted when the end load of the heat pump system changes, so as to achieve the purpose of dynamic adjustment of the outlet water temperature and keeping constant.
  • the current outlet water temperature of the device is detected in real time by a temperature sensor, the set outlet water temperature is obtained from a centralized controller, so as to obtain the current outlet water temperature difference, and the current compressor performance is determined according to the current outlet temperature difference.
  • Level gear and then query the preset energy level gear table to obtain the corresponding current compressor frequency, and control the compressor of the inverter compressor heat pump with the current compressor frequency, so that the heat pump
  • the compressor frequency can be dynamically adjusted following the set outlet water temperature and the current outlet water temperature, so as to ensure that the water temperature supplied to the terminal by the water pump remains constant. In this way, when the load of the terminal changes, the affected outlet water temperature change will cause the equipment to adjust the compressor frequency, so that the current outlet water temperature can be kept constant, and at the same time, the equipment will change the load on the terminal.
  • the adaptive function is used to adjust the compressor frequency, so that the current outlet water temperature can be kept constant, and at the same time, the equipment will change the load on the terminal.
  • Fig. 1 is a schematic structural diagram of a heat pump system in an embodiment of the present application
  • Fig. 2 is a flow chart of the steps of the water temperature control method of the heat pump system in the first embodiment of the present application.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, a feature defined with “first” or “second” may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of” means two or more than two, unless otherwise specifically defined.
  • the heat pump system includes several ends connected by water supply pipes and several equipment ends.
  • the water supply pipe is equipped with a water pump; the water temperature monitoring sensor is placed in the water supply pipe, and the centralized controller detects the water temperature of the main pipe in real time; There is a heat pump with inverter compressor at the end.
  • the first embodiment of the present application provides a water temperature control method of the heat pump system, and the control method includes at least the following steps:
  • S101 Detect the current outlet water temperature of the device in real time, and obtain the current outlet temperature difference between the current outlet water temperature and the set outlet temperature;
  • the current outlet water temperature of the device is collected by the water temperature monitoring sensor, and the set outlet temperature is obtained from the centralized controller, so as to calculate the current outlet temperature difference based on the set outlet temperature and the current outlet temperature.
  • the compressor frequency is set to the maximum frequency Fmax and the minimum frequency Fmin.
  • the preset energy level gear table is set at an interval of 1 Hz (adjustable):
  • EL is the current compressor energy level of the compressor
  • the description is as follows:
  • Ts is the set water outlet temperature
  • To is the current water outlet temperature
  • Ka Ka* ⁇ T
  • Ka the preset first temperature difference gain
  • Ka is obtained through experimental data, and is usually a fixed value
  • B is the preset energy level gain. This value is used to adapt when the total energy level shifts. Modifying the value of B can obtain the corresponding control strategy unchanged. For example, when the interval of 1Hz in the above table is changed to 0.5Hz, The total energy level is doubled, and the corresponding B value can be modified to 2*B.
  • the description is as follows:
  • Kc is the preset second temperature difference gain
  • Kc is obtained through experimental data, and is usually a fixed value
  • Ts is the set water outlet temperature
  • To is the current water outlet temperature
  • ⁇ t t n -t n-1 , ⁇ t is the interval time, t n is the current calculation time of C, and t n-1 is the time of calculation of the C value in the previous cycle.
  • the program will calculate the value of C once at an interval of ⁇ t; when the temperature difference ⁇ T ⁇ 0, the value of C will realize the fine adjustment of EL.
  • the inverter compressor heat pump device is used on the equipment side to replace the existing fixed frequency heat pump, so that when the end load of the heat pump system changes, the compressor frequency on the equipment side can be adjusted to achieve dynamic adjustment of the outlet water temperature and Keep a constant purpose.
  • the current outlet water temperature of the equipment is detected in real time by a temperature sensor, the set outlet water temperature is obtained from the centralized controller, so as to obtain the current outlet temperature difference, the current compressor energy level gear is determined according to the current outlet temperature difference, and then the preset energy is queried.
  • Stage gear table to obtain the corresponding current compressor frequency, and control the compressor of the inverter compressor heat pump with the current compressor frequency, so that the compressor frequency of the heat pump system can follow the set water temperature and the current water temperature during the operation of the heat pump system Perform dynamic adjustment to ensure that the water temperature at the end of the water pump remains constant. In this way, when the load at the end changes, the affected outlet water temperature change will cause the equipment to adjust the compressor frequency so that the current outlet water temperature can be kept constant, and at the same time, the equipment can adapt to the end load change.
  • the water temperature control method of a heat pump system specifically includes the following steps:
  • Step S1 before the compressor starts, collect the current outlet water temperature of the device through the water temperature monitoring sensor, obtain the set outlet temperature from the centralized controller, and calculate the current outlet temperature difference ⁇ T1 according to the set outlet temperature and the current outlet temperature;
  • step S2 after the compressor is started at the current compressor frequency (F1) and the preset time ⁇ t is reached, the A value (A2) and the C value (C2) are recalculated once.
  • Step S3 the step of determining the current compressor energy level according to the current outlet water temperature difference, specifically:
  • the current compressor energy level gear is determined according to the current outlet water temperature difference; wherein the interval between two adjacent preset time nodes is ⁇ t.
  • step S2 After the end of step S2, the A value (An) and the C value (Cn) are recalculated every time after the preset time ⁇ t.
  • Step S4 judging whether the current outlet water temperature difference is within a preset temperature difference threshold range
  • the lower threshold of the preset temperature difference threshold range is the set temperature difference negative threshold, and the upper threshold is the set temperature difference positive threshold;
  • step S2 is repeated, that is, according to the current outlet water temperature difference, the current compressor energy level gear is re-determined as the new energy level gear, and it is at the preset energy level gear. Re-acquire the current compressor frequency corresponding to the new energy level in the table to control the compressor frequency increase of the inverter compressor heat pump;
  • step S3 is entered, that is, according to the current outlet water temperature difference, the current compressor energy level gear is re-determined as the new energy level gear, and is at the preset energy level gear. Re-acquire the current compressor frequency corresponding to the new energy level in the table to control the compressor frequency reduction of the inverter compressor heat pump.
  • the water temperature control method of the heat pump system can enable the compressor frequency to be dynamically adjusted following the set outlet water temperature and the current outlet water temperature, thereby ensuring that the water temperature at the supply end of the water pump remains constant.
  • the affected outlet water temperature change will cause the equipment to adjust the compressor frequency so that the current outlet water temperature can be kept constant, and at the same time, the equipment can adapt to the end load change.
  • the third embodiment of the present application provides a heat pump system.
  • the heat pump system includes a centralized controller, an equipment end, a terminal, and a water pump arranged on a pipeline between the equipment end and the end.
  • Heat pump with inverter compressor; centralized controller is configured as:
  • EL is the current compressor energy level gear of the compressor
  • A is the coefficient
  • B is the preset energy level gain
  • C is the accumulated value
  • the centralized controller is also configured to:
  • the current compressor energy level gear is determined according to the current outlet water temperature difference; wherein the interval between two adjacent preset time nodes is ⁇ t.
  • the centralized controller is also configured to:
  • the lower limit threshold of the preset temperature difference threshold value range is the set temperature difference negative threshold value
  • the upper threshold value is the set temperature difference positive threshold value
  • the centralized controller is also configured to:
  • the current compressor energy level is re-determined as the new energy level according to the current outlet temperature difference, and the new energy level is obtained from the preset energy level table.
  • the current compressor frequency corresponding to the energy level gear to control the compressor frequency increase of the inverter compressor heat pump;
  • the current compressor energy level is re-determined as the new energy level according to the current outlet temperature difference, and the new energy level is obtained from the preset energy level table.
  • the energy level gear corresponds to the current compressor frequency to control the compressor frequency reduction of the inverter compressor heat pump.
  • the device embodiments described above are only illustrative, and the units described as separate parts may or may not be physically separated, and the parts displayed as units may or may not be physically separate. Units can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the connection relationship between the modules indicates that they have a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without creative work.

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  • 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)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

一种热泵系统的水温控制方法及热泵系统，方法包括实时检测设备端的当前出水温度，并获得当前出水温度与设定出水温度之间的当前出水温差；根据当前出水温差确定当前压缩机能级档位，并在预设的能级档位表中获取与当前压缩机能级档位对应的当前压缩机频率，以当前压缩机频率控制变频压缩机。该系统能够实现设备对末端负荷变化的自适应，在末端发生变化后实现出水温度的动态调节以保持水温恒定，提高一次热泵系统的性能。

Description

一种热泵系统的水温控制方法及热泵系统
相关申请的交叉引用
本申请要求于2019年10月29日提交中国专利局的申请号为CN201911042851.1、名称为“一种热泵系统的水温控制方法及热泵系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及热泵技术领域，尤其是涉及一种热泵系统的水温控制方法及热泵系统。
背景技术
随着低温热泵在商用采暖领域的优势越来越突出，商用采暖热泵越来越普及，更节能和更舒适已成为行业追求。目前热泵采暖工程根据实际现场情况，绝大部分使用一次泵系统或二次泵系统，而一次泵系统对比二次泵系统因为没有二次泵和蓄能水箱，在节省二次泵运行费用和工程安装费用上有明显优势。但是，本申请的发明人在研究中发现，由于一次泵系统采用定频热泵，每当末端负荷发生变化时，设备却不能自适应末端负荷变化，导致出水温度受到较大波动。
发明内容
本申请提供一种热泵系统的水温控制方法及热泵系统，以解决现有的一次泵系统设备的出水温度受末端负荷变化而产生波动的技术问题，本申请能够实现设备对末端负荷变化的自适应，在末端发生变化后实现出水温度的动态调节以保持水温恒定，提高一次热泵系统的性能。
为了解决上述技术问题，本申请实施例提供了一种热泵系统的水温控制方法，所述热泵系统包括设备端、末端以及设置在所述设备端与所述末端之间管道上的水泵，所述设备端具有变频压缩机热泵；所述水温控制方法至少包括以下步骤：
实时检测所述设备端的当前出水温度，并获得所述当前出水温度与设定出水温度之间的当前出水温差；
根据所述当前出水温差确定当前压缩机能级档位，并在预设的能级档位表中获取与所述当前压缩机能级档位对应的当前压缩机频率，以所述当前压缩机频率控制所述变频压缩机热泵的压缩机。
作为优选方案，用于确定所述压缩机的当前压缩机能级档位的公式为：EL＝A*B+C；
其中，EL为所述压缩机的当前压缩机能级档位，A为系数，B为预设的能级增益，C为累加值；
A＝Ka*ΔT，C＝Kc*ΔT*Δt，Ka为预设的第一温差增益，ΔT为所述当前出水温差， Kc为预设的第二温差增益，Δt为间隔时间。
作为优选方案，所述根据所述当前出水温差确定当前压缩机能级档位的步骤，具体为：
在压缩机启动后的任一预设时间节点，根据所述当前出水温差确定当前压缩机能级档位；其中，相邻的两个所述预设时间节点间隔时间为Δt。
作为优选方案，所述方法还包括：
判断所述当前出水温差是否在预设的温差阈值范围内；
若是，则保持所述当前出水温差所确定的当前压缩机能级档位，并以所述当前压缩机能级档位对应的当前压缩机频率控制所述变频压缩机热泵的压缩机；
若否，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频或降频。
作为优选方案，所述预设的温差阈值范围的下限阈值为设定温差负阀值，上限阈值为设定温差正阀值；
所述若否，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频或降频的步骤具体为：
当所述当前出水温差大于或等于所述设定温差正阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频；
当所述当前出水温差小于或等于所述设定温差负阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机降频。
本申请还提供一种热泵系统，所述热泵系统包括集中控制器、设备端、末端以及设置在所述设备端与所述末端之间管道上的水泵，所述设备端具有变频压缩机热泵；所述集中控制器被配置成：
实时检测所述设备端的当前出水温度，并获得所述当前出水温度与设定出水温度之间的当前出水温差；
根据所述当前出水温差确定当前压缩机能级档位，并在预设的能级档位表中获取与所述当前压缩机能级档位对应的当前压缩机频率，以所述当前压缩机频率控制所述变频压缩机热泵的压缩机。
作为优选方案，用于确定所述压缩机的当前压缩机能级档位的公式为：EL＝A*B+C；
其中，EL为所述压缩机的当前压缩机能级档位，A为系数，B为预设的能级增益，C 为累加值；
A＝Ka*ΔT，C＝Kc*ΔT*Δt，Ka为预设的第一温差增益，ΔT为所述当前出水温差，Kc为预设的第二温差增益，Δt为间隔时间。
作为优选方案，所述集中控制器还被配置成：
在压缩机启动后的任一预设时间节点，根据所述当前出水温差确定当前压缩机能级档位；其中，相邻的两个所述预设时间节点间隔时间为Δt。
作为优选方案，所述集中控制器还被配置成：
判断所述当前出水温差是否在预设的温差阈值范围内；
若是，则保持所述当前出水温差所确定的当前压缩机能级档位，并以所述当前压缩机能级档位对应的当前压缩机频率控制所述变频压缩机热泵的压缩机；
若否，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频或降频。
作为优选方案，所述预设的温差阈值范围的下限阈值为设定温差负阀值，上限阈值为设定温差正阀值；
所述集中控制器还被配置成：
当所述当前出水温差大于或等于所述设定温差正阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频；
当所述当前出水温差小于或等于所述设定温差负阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机降频。
综上，本申请实施例提供一种热泵系统的水温控制方法及热泵系统，其任意一种实施例的有益效果在于，通过在所述设备端采用变频压缩机热泵装置，取代现有的定频热泵，使得所述热泵系统在末端负荷发生变化时，所述设备端的压缩机频率能够调节，以达到出水温度动态调节和保持恒定的目的。
本申请实施例通过温度传感器实时检测所述设备端的当前出水温度，从集中控制器中获取所述设定出水温度，从而获得所述当前出水温差，根据所述当前出水温差确定所述当前压缩机能级档位，然后查询所述预设的能级档位表，获得对应的所述当前压缩机频率，以所述当前压缩机频率控制所述变频压缩机热泵的压缩机，从而使得所述热泵系统在运行过程中，其压缩机频率能够跟随所述设定出水温度、所述当前出水温度进行动态调节，进而保证水泵供给所述末端的水温保持恒定。这样当所述末端的负荷发生变化时，所影响到 的出水温度变化将引起所述设备调节压缩机频率，以使所述当前出水温度能够保持恒定，同时实现所述设备对所述末端负荷变化的自适应功能。
附图说明
为了更清楚地说明本申请的技术方案，下面将对实施方式中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例中的热泵系统的结构示意图；
图2是本申请第一实施例中的热泵系统的水温控制方法的步骤流程图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
此外，术语“第一”和“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”或“第二”的特征可以明示或隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为，表示包括一个或更多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本申请的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序，包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本申请的实施例所属技术领域的技术人员所理解。
本申请第一实施例：
请参见图1，热泵系统包括通过供水管道连接的若干末端和若干设备端，供水管道上设有水泵；将水温监测传感器放置在供水管道内，由集中控制器实时检测主管道的出水温度；设备端具有变频压缩机热泵。
请参见图2，基于热泵系统，本申请第一实施例提供了一种热泵系统的水温控制方法，控制方法至少包括以下步骤：
S101，实时检测设备端的当前出水温度，并获得当前出水温度与设定出水温度之间的当前出水温差；
在本实施例中，通过水温监测传感器采集设备端的当前出水温度，从集中控制器中获取设定出水温度，从而根据设定出水温度和当前出水温度计算得到当前出水温差。
S102，根据当前出水温差确定当前压缩机能级档位，并在预设的能级档位表中获取与当前压缩机能级档位对应的当前压缩机频率，以当前压缩机频率控制变频压缩机热泵的压缩机；
在本实施例中，将压缩机频率设置最大频率Fmax和最小频率Fmin，从Fmin开始，间隔1Hz(可调整)设定预设的能级档位表：
表1能级档位表
Figure PCTCN2019124778-appb-000001
用于确定压缩机的当前压缩机能级档位的公式为：EL＝A*B+C；
其中，EL为压缩机的当前压缩机能级档位；
A为设定出水温度和当前出水温度所得到的当前出水温差通过函数A＝f(ΔT)确定的系数，对于函数A＝f(ΔT)，说明如下：
ΔT＝Ts-To，Ts为设定出水温度，To为当前出水温度；
A＝Ka*ΔT，Ka为预设的第一温差增益，Ka通过实验数据得出，通常为一固定值；
当当前出水温差变大时，A值增大，EL对应增大，则压缩机频率上升。
当当前出水温差变小时，A值变小，EL对应变小，则压缩机频率下降。
B为预设的能级增益，该值用于适配当能级总档位发生变化时，修改B值可对应获得相应的控制策略不变化，例如当上表间隔1Hz改为0.5Hz时，总能级档位翻倍，对应B值修改为2*B即可。
C为通过函数C＝f(ΔT，T)确定的累加值，对于函数C＝f(ΔT，T)，说明如下：
C＝Kc*ΔT*Δt，Kc为预设的第二温差增益，Kc通过实验数据得出，通常为一固定值；
ΔT＝Ts-To，Ts为设定出水温度，To为当前出水温度；
Δt＝t n-t n-1，Δt为间隔时间，t n为当前计算C时刻，t n-1为上周期计算C值时刻。程序会间隔Δt时间计算一次C值；当温差ΔT≠0时，C值实现对EL的微调。
在本实施例中，通过在设备端采用变频压缩机热泵装置，取代现有的定频热泵，使得热泵系统在末端负荷发生变化时，设备端的压缩机频率能够调节，以达到出水温度动态调节和保持恒定的目的。
本申请实施例通过温度传感器实时检测设备端的当前出水温度，从集中控制器中获取设定出水温度，从而获得当前出水温差，根据当前出水温差确定当前压缩机能级档位，然后查询预设的能级档位表，获得对应的当前压缩机频率，以当前压缩机频率控制变频压缩 机热泵的压缩机，从而使得热泵系统在运行过程中，其压缩机频率能够跟随设定出水温度以及当前出水温度进行动态调节，进而保证水泵供给末端的水温保持恒定。这样当末端的负荷发生变化时，所影响到的出水温度变化将引起设备调节压缩机频率，以使当前出水温度能够保持恒定，同时实现设备对末端负荷变化的自适应功能。
本申请第二实施例：
基于本申请第一实施例，本申请第二实施例提出的一种热泵系统的水温控制方法，具体包括以下步骤：
步骤S1，在压缩机启动之前，通过水温监测传感器采集设备端的当前出水温度，从集中控制器中获取设定出水温度，从而根据设定出水温度和当前出水温度计算得到当前出水温差ΔT1；
根据当前出水温差计算A值(A1)，此时C值(C1)为0；
在计算得到当前压缩机能级档位EL(EL1)后，查表1找到对应的当前压缩机频率(F1)，从而设定设备端的压缩机频率为F1，控制压缩机以当前压缩机频率(F1)运行。
步骤S2，在压缩机以当前压缩机频率(F1)启动后，达到预设时间Δt后，重新计算一次A值(A2)和C值(C2)。
根据最新计算的能级EL(EL2)，查表1找到对应的当前压缩机频率(F2)，设定压缩机频率为F2，控制压缩机以当前压缩机频率(F2)运行。
步骤S3，根据当前出水温差确定当前压缩机能级档位的步骤，具体为：
在压缩机启动后的任一预设时间节点，根据当前出水温差确定当前压缩机能级档位；其中，相邻的两个预设时间节点间隔时间为Δt。
也即，在步骤S2结束之后每一次间隔预设时间Δt后，重新计算一次A值(An)和C值(Cn)。
并将上一周期极端的EL值(ELn-1)中的An-1，替换为本次计算的An，替换后再累加C值，则可得到最新的EL值(ELn)。
最后根据能级EL(ELn)，查表1找到对应的当前压缩机频率(Fn)，设定压缩机频率为Fn，控制压缩机以当前压缩机频率(Fn)运行。
步骤S4，判断当前出水温差是否在预设的温差阈值范围内；
若是，则保持当前出水温差所确定的当前压缩机能级档位，并以当前压缩机能级档位对应的当前压缩机频率控制变频压缩机热泵的压缩机；
若否，则根据当前出水温差重新确定当前压缩机能级档位为新能级档位，并在预设的能级档位表中重新获取与新能级档位对应的当前压缩机频率，以控制变频压缩机热泵的压缩机升频或降频。
其中，预设的温差阈值范围的下限阈值为设定温差负阀值，上限阈值为设定温差正阀值；
当当前出水温差大于或等于设定温差正阀值时，则重复步骤S2，也即根据当前出水温差重新确定当前压缩机能级档位为新能级档位，并在预设的能级档位表中重新获取与新能级档位对应的当前压缩机频率，以控制变频压缩机热泵的压缩机升频；
当当前出水温差小于或等于设定温差负阀值时，则进入步骤S3，也即根据当前出水温差重新确定当前压缩机能级档位为新能级档位，并在预设的能级档位表中重新获取与新能级档位对应的当前压缩机频率，以控制变频压缩机热泵的压缩机降频。
综上，本申请提供的热泵系统的水温控制方法，可以使压缩机频率能够跟随设定出水温度以及当前出水温度进行动态调节，进而保证水泵供给末端的水温保持恒定。这样当末端的负荷发生变化时，所影响到的出水温度变化将引起设备调节压缩机频率，以使当前出水温度能够保持恒定，同时实现设备对末端负荷变化的自适应功能。
本申请第三实施例：
对应于上述的热泵系统的水温控制方法，本申请第三实施例提供一种热泵系统，热泵系统包括集中控制器、设备端、末端以及设置在设备端与末端之间管道上的水泵，设备端具有变频压缩机热泵；集中控制器被配置成：
实时检测设备端的当前出水温度，并获得当前出水温度与设定出水温度之间的当前出水温差；
根据当前出水温差确定当前压缩机能级档位，并在预设的能级档位表中获取与当前压缩机能级档位对应的当前压缩机频率，以当前压缩机频率控制变频压缩机热泵的压缩机。
作为优选方案，用于确定压缩机的当前压缩机能级档位的公式为：EL＝A*B+C；
其中，EL为压缩机的当前压缩机能级档位，A为系数，B为预设的能级增益，C为累加值；
A＝Ka*ΔT，C＝Kc*ΔT*Δt，Ka为预设的第一温差增益，ΔT为当前出水温差，Kc为预设的第二温差增益，Δt为间隔时间。
作为优选方案，集中控制器还被配置成：
在压缩机启动后的任一预设时间节点，根据当前出水温差确定当前压缩机能级档位；其中，相邻的两个预设时间节点间隔时间为Δt。
作为优选方案，集中控制器还被配置成：
判断当前出水温差是否在预设的温差阈值范围内；
若是，则保持当前出水温差所确定的当前压缩机能级档位，并以当前压缩机能级档位对应的当前压缩机频率控制变频压缩机热泵的压缩机；
若否，则根据当前出水温差重新确定当前压缩机能级档位为新能级档位，并在预设的能级档位表中重新获取与新能级档位对应的当前压缩机频率，以控制变频压缩机热泵的压缩机升频或降频。
作为优选方案，预设的温差阈值范围的下限阈值为设定温差负阀值，上限阈值为设定温差正阀值；
集中控制器还被配置成：
当当前出水温差大于或等于设定温差正阀值时，则根据当前出水温差重新确定当前压缩机能级档位为新能级档位，并在预设的能级档位表中重新获取与新能级档位对应的当前压缩机频率，以控制变频压缩机热泵的压缩机升频；
当当前出水温差小于或等于设定温差负阀值时，则根据当前出水温差重新确定当前压缩机能级档位为新能级档位，并在预设的能级档位表中重新获取与新能级档位对应的当前压缩机频率，以控制变频压缩机热泵的压缩机降频。
需说明的是，以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。另外，本申请提供的装置实施例附图中，模块之间的连接关系表示它们之间具有通信连接，具体可以实现为一条或多条通信总线或信号线。本领域普通技术人员在不付出创造性劳动的情况下，即可以理解并实施。
以上所述是本申请的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为在本申请的保护范围内。

Claims (10)

  1. 一种热泵系统的水温控制方法，其特征在于，所述热泵系统包括设备端、末端以及设置在所述设备端与所述末端之间管道上的水泵，所述设备端具有变频压缩机热泵；所述水温控制方法至少包括以下步骤：
    实时检测所述设备端的当前出水温度，并获得所述当前出水温度与设定出水温度之间的当前出水温差；
    根据所述当前出水温差确定当前压缩机能级档位，并在预设的能级档位表中获取与所述当前压缩机能级档位对应的当前压缩机频率，以所述当前压缩机频率控制所述变频压缩机热泵的压缩机。
  2. 如权利要求1所述的热泵系统的水温控制方法，其特征在于，用于确定所述压缩机的当前压缩机能级档位的公式为：EL＝A*B+C；
    其中，EL为所述压缩机的当前压缩机能级档位，A为系数，B为预设的能级增益，C为累加值；
    A＝Ka*ΔT，C＝Kc*ΔT*Δt，Ka为预设的第一温差增益，ΔT为所述当前出水温差，Kc为预设的第二温差增益，Δt为间隔时间。
  3. 如权利要求2所述的热泵系统的水温控制方法，其特征在于，所述根据所述当前出水温差确定当前压缩机能级档位的步骤，具体为：
    在压缩机启动后的任一预设时间节点，根据所述当前出水温差确定当前压缩机能级档位；其中，相邻的两个所述预设时间节点间隔时间为Δt。
  4. 如权利要求1或2所述的热泵系统的水温控制方法，其特征在于，所述方法还包括：
    判断所述当前出水温差是否在预设的温差阈值范围内；
    若是，则保持所述当前出水温差所确定的当前压缩机能级档位，并以所述当前压缩机能级档位对应的当前压缩机频率控制所述变频压缩机热泵的压缩机；
    若否，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频或降频。
  5. 如权利要求4所述的热泵系统的水温控制方法，其特征在于，所述预设的温差阈值范围的下限阈值为设定温差负阀值，上限阈值为设定温差正阀值；
    所述若否，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以 控制所述变频压缩机热泵的压缩机升频或降的步骤具体为：
    当所述当前出水温差大于或等于所述设定温差正阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频；
    当所述当前出水温差小于或等于所述设定温差负阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机降频。
  6. 一种热泵系统，其特征在于，所述热泵系统包括集中控制器、设备端、末端以及设置在所述设备端与所述末端之间管道上的水泵，所述设备端具有变频压缩机热泵；所述集中控制器被配置成：
    实时检测所述设备端的当前出水温度，并获得所述当前出水温度与设定出水温度之间的当前出水温差；
    根据所述当前出水温差确定当前压缩机能级档位，并在预设的能级档位表中获取与所述当前压缩机能级档位对应的当前压缩机频率，以所述当前压缩机频率控制所述变频压缩机热泵的压缩机。
  7. 如权利要求6所述的热泵系统，其特征在于，用于确定所述压缩机的当前压缩机能级档位的公式为：EL＝A*B+C；
    其中，EL为所述压缩机的当前压缩机能级档位，A为系数，B为预设的能级增益，C为累加值；
    A＝Ka*ΔT，C＝Kc*ΔT*Δt，Ka为预设的第一温差增益，ΔT为所述当前出水温差，Kc为预设的第二温差增益，Δt为间隔时间。
  8. 如权利要求7所述的热泵系统，其特征在于，所述集中控制器还被配置成：
    在压缩机启动后的任一预设时间节点，根据所述当前出水温差确定当前压缩机能级档位；其中，相邻的两个所述预设时间节点间隔时间为Δt。
  9. 如权利要求6或7所述的热泵系统，其特征在于，所述集中控制器还被配置成：
    判断所述当前出水温差是否在预设的温差阈值范围内；
    若是，则保持所述当前出水温差所确定的当前压缩机能级档位，并以所述当前压缩机能级档位对应的当前压缩机频率控制所述变频压缩机热泵的压缩机；
    若否，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控 制所述变频压缩机热泵的压缩机升频或降频。
  10. 如权利要求9所述的热泵系统，其特征在于，所述预设的温差阈值范围的下限阈值为设定温差负阀值，上限阈值为设定温差正阀值；
    所述集中控制器还被配置成：
    当所述当前出水温差大于或等于所述设定温差正阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机升频；
    当所述当前出水温差小于或等于所述设定温差负阀值时，则根据所述当前出水温差重新确定当前压缩机能级档位为新能级档位，并在所述预设的能级档位表中重新获取与所述新能级档位对应的当前压缩机频率，以控制所述变频压缩机热泵的压缩机降频。
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