CN113819506A - Solar photovoltaic photo-thermal heat pump control system and method based on load self-adaption - Google Patents

Solar photovoltaic photo-thermal heat pump control system and method based on load self-adaption Download PDF

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CN113819506A
CN113819506A CN202111179743.6A CN202111179743A CN113819506A CN 113819506 A CN113819506 A CN 113819506A CN 202111179743 A CN202111179743 A CN 202111179743A CN 113819506 A CN113819506 A CN 113819506A
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air
heat
pvt
temperature
indoor
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CN113819506B (en
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范满
王祥达
桑文虎
徐建伟
左瑞旺
张曦
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Hebei University of Technology
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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
    • 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
    • F24D19/1045—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump and solar energy
    • 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
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
    • F25B27/005—Machines, plants or systems, using particular sources of energy using solar energy in compression type systems
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/40—Thermal components
    • H02S40/44—Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time
    • 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
    • F24D2200/02—Photovoltaic energy
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/14—Solar energy
    • 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
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/272—Solar heating or cooling
    • 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
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • 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
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/60—Thermal-PV hybrids

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention relates to a solar photovoltaic photo-thermal pump control system and a method based on load self-adaptation, wherein a PVT heat pump unit comprises a condenser, a compressor, an expansion valve, a PVT evaporator and an air-cooled evaporator, the control system comprises a sensing monitoring end, a data acquisition module, a data processing module, an output control end, a feedback monitoring end and a database module, the data processing module receives and processes data transmitted by the data acquisition module, calculates the building heat load according to indoor and outdoor environmental conditions, and compares the building heat load with preset data in the database module, namely the heat supply of the system under different outdoor environmental conditions and operation modes, so that the operation mode of the system under the current indoor and outdoor environmental conditions is obtained, and a processing result is converted into a control signal to be transmitted to the output control end. When weather conditions and building loads change, the control system can accurately sense the working environment of the PVT heat pump, so that the operation mode is automatically adjusted, and the cogeneration efficiency of the system is improved.

Description

Solar photovoltaic photo-thermal heat pump control system and method based on load self-adaption
Technical Field
The invention relates to the technical field of solar photovoltaic photo-thermal (PVT) heat pump control, in particular to a load self-adaptive PVT heat pump control system and method.
Background
As a new combined heat and power system, a solar photovoltaic and photo-thermal integrated (PVT) heat pump has the following advantages: a) the discontinuous solar energy is compensated by utilizing the heat pump so as to ensure the stability of the system operation; b) the solar energy is utilized to increase the evaporation temperature of the heat pump and improve the thermodynamic performance of the system, thereby realizing the advantage complementation and the cascade utilization of clean energy. The practical application effect of the PVT heat pump also needs to consider the matching characteristics of the system energy supply and the building load. Real-time changing meteorological parameters such as solar radiation illumination can cause the unsteady coupling and transfer process of energy in a source end PVT evaporator and the complex variability and uncertainty of energy using behaviors of a load end user, and a certain attenuation and delay exist among external disturbance quantity, system energy supply and fluctuation amplitude of building load. However, most of the existing PVT heat pump systems are manually controlled by remote controllers or line controllers, so that the heat pump systems cannot be flexibly controlled according to the characteristics of different areas, weather, building types and indoor temperature requirements, and a control system and a method for adapting the energy supply of the system to the building load need to be further improved.
Disclosure of Invention
In view of the above-mentioned drawbacks, the present invention provides a PVT heat pump control system and method with simple structure and convenient use. When weather conditions and building loads change, the control system can accurately sense the working environment of the PVT heat pump, so that the operation mode is automatically adjusted, and the cogeneration efficiency of the system is improved.
The invention provides a load self-adaptive PVT heat pump control system, which has the following specific technical scheme: PVT heat pump set and control system, PVT heat pump set includes condenser, compressor, expansion valve, PVT evaporimeter and air-cooled evaporimeter, and control system includes sensing monitoring end, data acquisition module, data processing module, output control end, feedback monitoring end and database module, its characterized in that:
the PVT evaporator shell is in a right-angle triangular prism shape, one side surface of a right-angle side is fixed on a roof or an installation plane of an object to be installed, a heat exchange plate is installed on the oblique side surface, the oblique side surface is installed in the south direction, and a photovoltaic plate is fixed on the upper surface of the heat exchange plate; the lower surface of the heat exchange plate is provided with a PVT evaporation coil branch; an air-cooled evaporation coil branch is arranged in the right-angle triangular prism and parallel to the oblique side surface, a fan is arranged in the space between the air-cooled evaporation coil branch and the adjacent side surface of the shell, and the fan is positioned on the air inlet side of the PVT evaporator; the air-cooled evaporation coil branch is formed by two layers of pipelines connected in series, each layer of pipeline is provided with a fin, and the two layers of pipelines are arranged in the shell in parallel to the heat exchange plate; the refrigerant inlet is positioned on the air-cooled evaporating coil branch circuit connected with the upper fin, and the refrigerant outlet is positioned on the air-cooled evaporating coil branch circuit connected with the lower fin. Compared with a spray evaporation type solar photovoltaic photo-thermal (PVT) condenser provided in the patent ZL202010453021.4, the PVT heat pump unit provided by the invention is slightly different in structure, is used under a winter heat supply working condition, does not need a spray evaporation cooling device, and does not contain a water coil branch in order to avoid the control system from being too complex and ensure the stability of system operation.
The sensing monitoring end comprises an outdoor temperature monitoring end, a wind speed monitoring end, a solar radiation monitoring end and the like, and a small weather station is installed outdoors and used for monitoring solar radiation, outdoor air temperature and wind speed. And the data monitored by the sensing monitoring end and the set temperature are used as input ends to be uploaded to the data acquisition module in real time.
The data acquisition module is used for acquiring data monitored by the sensing monitoring end and transmitting the data to the data processing module.
The data processing module receives and processes the data transmitted by the data acquisition module, calculates the building heat load according to the indoor and outdoor environmental conditions, compares the building heat load with preset data in the database module, namely the heat load of the system under different outdoor environmental conditions and operation modes, thereby obtaining the operation mode of the system under the current indoor and outdoor environmental conditions, and converts the processing result into a control signal to be transmitted to the output control end.
The output control end comprises an air-cooled evaporation coil branch control end, a PVT evaporation coil branch control end, an outdoor fan control end, an indoor fan control end, an expansion valve control end and a compressor control end. And the output control end controls the opening and closing of the two groups of evaporating coil branch circuits, the starting and stopping of the fan, the opening degree of the expansion valve and the rotating speed of the compressor according to the control signals transmitted by the data processing module so as to change the operation modes of the system under different working conditions.
The database stores heat supply of system in different regions, weather, indoor design parameters and operation modes (for example, the daytime system adopts air-cooled evaporation coil branch control end heat supply Q independentlyairSeparately adopting PVT evaporating coil branch control end heat supply quantity QPVTAnd simultaneously adopting two coil branch control ends to supply heat Qair-PVT(ii) a Heat production quantity Q 'of air-cooled evaporation coil branch control end is independently adopted by night system'airHeating quantity Q 'controlled by branch of PVT evaporation coil pipe'PVTAnd two coil branch control end heating quantity Q 'are adopted simultaneously'air-PVT) And corresponding operating strategy (e.g. using air-cooled steam alone)A pipe distributing branch, a PVT evaporating pipe branch which is independently adopted, and a PVT evaporating pipe branch and an air-cooled evaporating pipe branch which are simultaneously adopted). The heat supply and the operation strategy are obtained by big data statistics according to test and simulation results.
The feedback monitoring end is arranged for ensuring the stable and efficient operation of the system and meeting the set requirement of the indoor environment parameters. The feedback monitoring end comprises a temperature monitoring end, a pressure monitoring end and a flow monitoring end, wherein the temperature monitoring end comprises an evaporation and condenser inlet and outlet air temperature monitoring end and a refrigerant temperature monitoring end. The inlet of the refrigerant coil is provided with a refrigerant flow sensor, the inlet and the outlet are provided with a temperature sensor and a pressure sensor, the air inlet of the evaporation condenser and the air inlet of the condenser are provided with an air flow sensor, and the inlet and the outlet are provided with a temperature sensor. The feedback monitoring end transmits the monitored parameters such as temperature, pressure and flow to the data processing module through the data acquisition module, and the data processing module analyzes whether the indoor side return air temperature meets the temperature requirement set by a user or not to adjust the system operation: if not, the output control end can adjust the heat supply amount of the system by adjusting the rotating speed of the fan, the opening degree of the expansion valve, the rotating speed of the compressor and the like so as to meet the requirement of the user on the thermal environment; if so, the operation is continued with the current scheme.
The invention also provides a load self-adaptive PVT heat pump control system, and the specific control process of the method is as follows:
the system comprises a data acquisition module, a data processing module, an output control end and a signal control system, wherein the data acquisition module is used for receiving data and transmitting the data to the data processing module, the data processing module is used for calculating building heat load according to indoor and outdoor environmental conditions, comparing the building heat load with set heat load in a database, determining operation modes of a heat pump unit under different working conditions, converting a processing result into a control signal and transmitting the control signal to the output control end, and the output control end controls the operation of each component of the system according to the signal. During the operation, the system feedback monitoring end can monitor the temperature, the pressure and the flow of the refrigerant, the return air temperature and the air quantity of the indoor side, the efficient and stable operation of the system is guaranteed, and the requirement of a user on the thermal environment is met. If the user thermal environment requirement is not met, the system can adjust the rotating speed of the fan, the opening degree of the expansion valve, the rotating speed of the compressor and the like, and adjust the heat supply amount of the system so as to meet the user thermal environment requirement; and if the requirement of the user on the thermal environment is met, continuing to operate by the current scheme.
During the daytime, the system monitors parameters such as solar radiation illumination S, outdoor temperature T, outdoor wind speed v and the like, data are transmitted to the data processing module through the data acquisition module, and the data processing module calculates the building heat load Q according to indoor and outdoor environmental conditions. In order to fully utilize the heat provided by solar energy in the operation mode selection process, the system firstly judges whether the solar radiation illumination meets the requirement, and then judges the relationship between the heat load and the heat supply load, so as to determine the operation mode of the system. When the solar radiation illumination S is less than the solar radiation illumination set value SminIn time, if the building heat load Q is less than the heat supply set value QairThe system output control end controls and opens the air-cooled evaporation coil branch, the branch works independently to supply heat for the building, and the refrigerant in the coil absorbs the heat energy in the air to provide heat for the building; if the building heat load Q is more than or equal to the heat supply set value QairThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to provide heat for the building. When the solar radiation illumination S is more than or equal to the solar radiation illumination set value SminIn time, if the building heat load Q is less than the heat supply set value QPVTThe system output control end controls and opens a PVT evaporation coil branch, the branch works independently to supply heat for the building, the refrigerant in the coil absorbs solar energy and air heat energy simultaneously to supply heat for the building, and meanwhile, electric energy generated by the photovoltaic panel can be used by the system; if the building heat load Q is more than or equal to the heat supply set value QPVTThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to provide heat for the building.
At night, the system monitors parameters such as outdoor temperature T and the like, data are transmitted to the data processing module through the acquisition module, and the data processing module calculates the building heat load Q' according to indoor and outdoor environmental conditions. Solar radiation at nightThe illumination S ' is 0, if the building heat load Q ' is less than the heat supply set value Q 'airThe system output control end controls and opens the air-cooled evaporation coil branch, the branch works independently to supply heat for the building, and the refrigerant in the coil absorbs the heat energy in the air to provide heat for the building; if the building heat load Q 'is greater than or equal to the heat supply set value Q'airThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to supply heat for the building.
And aiming at the multiple operation modes, whether the outdoor fan operates or not is judged according to the difference value delta T between the evaporation temperature and the outdoor air temperature. Setting start-stop temperature difference delta T0When Δ T is greater than or equal to a set value Δ T0When the fan is started, the fan is not started; when the delta T is smaller than the set value delta T0During the time, output control end control fan opens, and air flow rate increases, has increased the heat convection coefficient, and the evaporimeter draws more heat from the air side. Meanwhile, during the operation of the system, if the feedback monitoring end monitors that the return air temperature at the indoor side is too high or too low, the system can adjust the rotating speed of the fan and the rotating speed of the compressor, and further adjust the heating capacity of the system. The specific adjusting mode is as follows: when the indoor side return air temperature is too high, the difference value between the indoor side return air temperature and the indoor set temperature is larger than the set value delta TinWhen the system is used, the rotating speed of the compressor is firstly adjusted, and the rotating speed m% of the compressor is reduced to reduce the heating capacity output by the compressor, so that the heating capacity of the system is reduced until the indoor temperature requirement is met; if the compressor is adjusted to the minimum required speed n0The indoor temperature requirement can not be met, the rotating speed of the fan can be adjusted by the system, the rotating speed of the fan is reduced step by step, and the heat convection of air and a refrigerant is weakened to reduce the heating capacity until the indoor temperature requirement is met. When the indoor side return air temperature is too low, the difference value between the indoor set temperature and the indoor side return air temperature is larger than the set value delta TinWhen the system is used, the rotating speed of the fan is firstly adjusted, the rotating speed of the fan is gradually increased, and the convection heat transfer coefficient of air and a refrigerant is enhanced until the requirement of indoor temperature is met and the indoor air speed does not exceed the maximum limit value; if the fan is adjusted to the highest gear or the indoor wind speed reaches the maximum limit value requirement vmaxThen the indoor temperature requirement can not be met, and the system canAnd adjusting the rotating speed of the compressor, and increasing the rotating speed m% of the compressor to increase the heating capacity output by the compressor so as to increase the heating capacity of the system until the indoor temperature requirement is met. If the feedback monitoring end monitors that the indoor return air temperature meets the requirement of the thermal environment, the system continues to operate according to the current scheme.
In the adjusting process, the fan is divided into a high gear, a middle gear and a low gear, so that the fan can be adjusted step by step. The compressor can realize stepless regulation, namely the rotating speed can be continuously changed, so that m percent of regulation amplitude of each time is manually set in the regulation of the rotating speed of the compressor, m is related to the rotating speed, and m is too large or too small, which may cause the increase of energy consumption or the frequent regulation of the compressor and cause unstable operation. Minimum required speed n of compressor0The compressor is determined to ensure the operation efficiency and stable operation of the compressor, and is specified when the compressor is manufactured and delivered from a factory. Indoor maximum wind speed limit vmaxMay be determined by consulting the relevant specification standard.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention optimizes the PVT heat pump control system, and adjusts the heat supply of the system by controlling the opening and closing of the two groups of evaporating coil branch circuits, the starting and stopping of the fan, the opening degree of the expansion valve, the rotating speed of the compressor and the like so as to meet the requirement of users on thermal environment. The heat pump control system can adopt different operation modes according to different areas, weather, building types and indoor temperature requirements, realizes the coupling operation of the PVT evaporator and the air-cooled evaporator, fully utilizes the solar clean renewable energy for cogeneration, and achieves the purposes of energy conservation and consumption reduction.
(2) The invention also correspondingly provides a control method, which comprehensively considers the matching characteristic of the system energy supply and the building load and ensures that the heat pump system has better adaptability to the changing working conditions. The system heat supply and corresponding operation strategies under different indoor and outdoor parameters and operation modes are preset in the database module, and are respectively compared with the solar radiation illumination obtained by monitoring of the sensing monitoring end and the building heat load, so that the operation modes of the heat pump unit under different working conditions are determined, and the operation of each component of the system is controlled. The feedback monitoring end is introduced into the control system, and the operation mode can be adjusted in time according to whether the indoor thermal environment meets the requirements of users during the operation of the system, so that a good indoor thermal environment can be created, the power consumption of the heat pump system can be reduced, and the efficient and stable operation of the system is ensured.
(3) The heat pump control system provided by the invention firstly judges whether the solar radiation illumination meets the requirements in the control engineering, and then determines the system operation mode according to the relation between the heat load and the heat supply load. When the return air temperature at the indoor side is too high, the heating capacity of the system is larger than the heating capacity of a room, and the heating capacity needs to be reduced at the moment, the system can slow down the rotating speed of the compressor firstly, reduce the power consumption of the compressor, and reduce the rotating speed of the fan step by step if the requirement is not met, so that the heat convection effect of air and a refrigerant is weakened; when the indoor side return air temperature is too low, it shows that the system heating capacity is less than the room heating capacity, needs to increase the heating capacity this moment, and the system can increase the fan rotational speed earlier, reinforcing convection heat transfer coefficient to this increases the heating capacity, if unsatisfied the requirement and readjust the compressor rotational speed, the control method of this application can realize energy-conservation, reduction power consumptive furthest.
Drawings
FIG. 1 is a diagram of a PVT heat pump control system;
FIG. 2 is a schematic diagram of the connection of endpoints and modules;
FIG. 3PVT heat pump control flow chart;
figure 4PVT heat pump control system mode selection logic diagram.
In the figure, a data acquisition module 1, a data processing module 2, an output control end 3, a heat pump unit 4, a feedback monitoring end 5, a database module 6 and a sensing monitoring end 7 (a small-sized meteorological station) are arranged; 8 gas-liquid separator, 9 compressor, 10 expansion valve, 11 temperature sensor, 12 pressure sensor, 13 flow sensor.
Detailed Description
The present invention is further explained with reference to the following examples and drawings, but the scope of the present invention is not limited thereto.
As shown in fig. 1, the PVT heat pump control system provided by the present invention includes: the system comprises a sensing monitoring end 7, a data acquisition module 1, a data processing module 2, an output control end 3, a feedback monitoring end 5 and a database module 6, wherein the connection mode between each end point and each module is shown in figure 2.
The sensing monitoring end 7 comprises an outdoor temperature monitoring end, a wind speed monitoring end, a solar radiation monitoring end and the like, and a small weather station is installed outdoors and used for monitoring solar radiation, outdoor air temperature and wind speed. The data monitored by the sensing monitoring end 7 and the indoor set temperature of the user are used as input ends to be uploaded to the data acquisition module 1 in real time.
The data acquisition module 1 is used for acquiring data monitored by the sensing monitoring end 7 and transmitting the data to the data processing module 2.
The data processing module 2 receives and processes the data transmitted by the data acquisition module, calculates the building heat load according to the indoor and outdoor environmental conditions, compares the building heat load with preset data in the database module, namely the heat load of the system under different outdoor environmental conditions and operation modes, thereby obtaining the operation mode of the system under the current indoor and outdoor environmental conditions, and converts the processing result into a control signal to be transmitted to the output control terminal 3.
The output control end 3 comprises an air-cooled evaporation coil branch control end, a PVT evaporation coil branch control end, an outdoor fan control end, an indoor fan control end, an expansion valve control end and a compressor control end. The output control end 3 controls the opening and closing of the two groups of evaporating coil branch circuits, the starting and stopping of the fan, the opening degree of the expansion valve and the rotating speed of the compressor according to the control signals transmitted by the data processing module 2 so as to change the operation modes of the system under different working conditions.
The database 6 stores heat supply of system in different regions, weather, indoor design parameters and operation modes (for example, the daytime system adopts air-cooled evaporation coil branch control end heat supply Q independentlyairSeparately adopting PVT evaporating coil branch control end heat supply quantity QPVTAnd simultaneously adopting two coil branch control ends for heat supplyQuantity Qair-PVT(ii) a Heat production quantity Q 'of air-cooled evaporation coil branch control end is independently adopted by night system'airHeating quantity Q 'controlled by branch of PVT evaporation coil pipe'PVTAnd two coil branch control end heating quantity Q 'are adopted simultaneously'air-PVT) And corresponding operation strategies (such as adopting an air-cooled evaporation coil branch alone, adopting a PVT evaporation coil branch alone and adopting the PVT evaporation coil branch and the air-cooled evaporation coil branch at the same time). The heat supply and the operation strategy are obtained by big data statistics according to test and simulation results.
The feedback monitoring end 5 is arranged for ensuring the stable and efficient operation of the system and meeting the set requirements of indoor environment parameters. The feedback monitoring end 5 comprises a temperature monitoring end, a pressure monitoring end and a flow monitoring end, wherein the temperature monitoring end comprises an evaporation and condenser inlet and outlet air temperature monitoring end and a refrigerant temperature monitoring end. The inlet of the refrigerant coil is provided with a refrigerant flow sensor, the inlet and the outlet are provided with a temperature sensor and a pressure sensor, the air inlet of the evaporation condenser and the air inlet of the condenser are provided with an air flow sensor, and the inlet and the outlet are provided with a temperature sensor. The feedback monitoring end transmits the monitored parameters such as temperature, pressure and flow to the data processing module through the data acquisition module, and the data processing module analyzes whether the indoor side return air temperature meets the temperature requirement set by a user or not to adjust the system operation: if not, the output control end can adjust the heat supply amount of the system by adjusting the rotating speed of the fan, the opening degree of the expansion valve, the rotating speed of the compressor and the like so as to meet the requirement of the user on the thermal environment; if so, the operation is continued with the current scheme.
The control flow and the operation mode selection logic of the PVT heat pump control system are respectively shown in fig. 3 and 4, and specifically include:
the method comprises the steps that a user sets temperature, namely, the indoor temperature is determined, a sensing monitoring end monitors parameters such as outdoor air temperature, outdoor wind speed and solar radiation illumination, data are transmitted to a data acquisition module, the data acquisition module receives the data and then transmits the data to a data processing module, the data processing module calculates building heat load according to indoor and outdoor environment conditions, the building heat load is compared with set heat load in a database, then the operation modes of a heat pump unit under different working conditions are determined, a processing result is converted into a control signal and transmitted to an output control end, and the output control end controls the operation of all parts of a system according to the signal. During the operation, system feedback monitoring end can monitor refrigerant temperature, pressure and flow and indoor side return air temperature, guarantees the high-efficient steady operation of system and satisfies user's thermal environment demand. If the user thermal environment requirement is not met, the system returns to a 'selection and adjustment system operation mode', namely, the opening and closing of the two groups of evaporation coil branch circuits, the starting and stopping of the fan, the opening degree of the expansion valve, the rotating speed of the compressor and the like are controlled, and the system heat supply amount is adjusted to meet the user thermal environment requirement; and if the requirement of the user on the thermal environment is met, continuing to operate by the current scheme.
During the daytime, the system monitors parameters such as solar radiation illumination S, outdoor temperature T, outdoor wind speed v and the like, data are transmitted to the data processing module through the data acquisition module, and the data processing module calculates the building heat load Q according to indoor and outdoor environmental conditions. In order to fully utilize the heat provided by solar energy in the operation mode selection process, the system firstly judges whether the solar radiation illumination meets the requirement, and then judges the relationship between the heat load and the heat supply load, so as to determine the operation mode of the system. When the solar radiation illumination S is less than the solar radiation illumination set value SminIn time, if the building heat load Q is less than the heat supply set value QairThe system output control end controls and opens the air-cooled evaporation coil branch, the branch works independently to supply heat for the building, and the refrigerant in the coil absorbs the heat energy in the air to provide heat for the building; if the building heat load Q is more than or equal to the heat supply set value QairThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to provide heat for the building. When the solar radiation illumination S is more than or equal to the solar radiation illumination set value SminIn time, if the building heat load Q is less than the heat supply set value QPVTThe system output control end controls and opens a PVT evaporation coil branch, the branch works independently to supply heat for the building, the refrigerant in the coil absorbs solar energy and air heat energy simultaneously to supply heat for the building, and meanwhile, electric energy generated by the photovoltaic panel can be used by the system; if the building heat load Q is largeAt or equal to the heat supply set value QPVTThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to provide heat for the building.
At night, the system monitors parameters such as outdoor temperature T and the like, data are transmitted to the data processing module through the acquisition module, and the data processing module calculates the building heat load Q' according to indoor and outdoor environmental conditions. The solar radiation illumination S ' is 0 at night, and if the building heat load Q ' is less than the heat supply set value Q 'airThe system output control end controls and opens the air-cooled evaporation coil branch, the branch works independently to supply heat for the building, and the refrigerant in the coil absorbs the heat energy in the air to provide heat for the building; if the building heat load Q 'is greater than or equal to the heat supply set value Q'airThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to supply heat for the building.
And aiming at the multiple operation modes, whether the outdoor fan operates or not is judged according to the difference value delta T between the evaporation temperature and the outdoor air temperature. Setting start-stop temperature difference delta T0When Δ T is greater than or equal to a set value Δ T0When the fan is started, the fan is not started; when the delta T is smaller than the set value delta T0During the time, output control end control fan opens, and air flow rate increases, has increased the heat convection coefficient, and the evaporimeter draws more heat from the air side. Meanwhile, during the operation of the system, if the feedback monitoring end monitors that the return air temperature at the indoor side is too high or too low, the system can adjust the rotating speed of the fan and the rotating speed of the compressor, and further adjust the heating capacity of the system. The specific adjusting mode is as follows: when the indoor side return air temperature is too high, the difference value between the indoor side return air temperature and the indoor set temperature is larger than the set value delta TinWhen the system is used, the rotating speed of the compressor is firstly adjusted, and the rotating speed m% of the compressor is reduced to reduce the heating capacity output by the compressor, so that the heating capacity of the system is reduced until the indoor temperature requirement is met; if the compressor is adjusted to the minimum required speed n0The indoor temperature requirement can not be met, the rotating speed of the fan can be adjusted by the system, the rotating speed of the fan is reduced step by step, and the heat convection of air and a refrigerant is weakened to reduce the heating capacity until the indoor temperature requirement is met. When the indoor side isThe return air temperature is too low, and the difference between the indoor set temperature and the indoor side return air temperature is more than a set value delta TinWhen the system is used, the rotating speed of the fan is firstly adjusted, the rotating speed of the fan is gradually increased, and the convection heat transfer coefficient of air and a refrigerant is enhanced until the requirement of indoor temperature is met and the indoor air speed does not exceed the maximum limit value; if the fan is adjusted to the highest gear or the indoor wind speed reaches the maximum limit value requirement vmaxAnd then the indoor temperature requirement cannot be met, the system can adjust the rotating speed of the compressor, and the rotating speed m% of the compressor is increased to increase the heating capacity output by the compressor, so that the heating capacity of the system is increased until the indoor temperature requirement is met. If the feedback monitoring end monitors that the indoor return air temperature meets the requirement of the thermal environment, the system continues to operate according to the current scheme.
Various setting parameters (such as solar radiation illumination S) in database module of control system of the inventionminTemperature difference delta T of start and stop0Etc.), setting heat supply (for example, the daytime system separately adopts the heat supply Q of the branch control end of the air-cooled evaporation coilairSeparately adopting PVT evaporating coil branch control end heat supply quantity QPVTAnd simultaneously adopting two coil branch control ends to supply heat Qair-PVT(ii) a Heat production quantity Q 'of air-cooled evaporation coil branch control end is independently adopted by night system'airHeating quantity Q 'controlled by branch of PVT evaporation coil pipe'PVTAnd two coil branch control end heating quantity Q 'are adopted simultaneously'air-PVT) The operation strategy (such as independently adopting the air-cooled evaporation coil branch, independently adopting the PVT evaporation coil branch and simultaneously adopting the PVT evaporation coil branch and the air-cooled evaporation coil branch) needs to be tested and simulated according to the characteristics of different areas, weather, building types and indoor temperature requirements, and the operation modes of the heat pump system under different working conditions are directly programmed into the operation strategy for direct use by users.
Examples
Taking Tianjin City as an example, the data are consulted to find that Tianjin City is coldest in one month in winter, the daily minimum air temperature is-5 ℃, the annual average wind speed is 2-4 m/s, the sunshine percentage is 60%, heating is started in November, and the daily average air temperature is about 5 ℃.
There is too much in the daytimeDuring solar radiation, electric energy generated by the photovoltaic panel can be supplied to a system, the PVT evaporation coil branch can supply heat to a building by absorbing heat generated by power generation of the photovoltaic panel, and the air-cooled evaporation coil branch can also supply heat to the building by absorbing air heat energy. When the solar irradiance is low, e.g. S<200W/m2The photovoltaic panel has lower working efficiency, and if the building thermal load is lower at the moment, the photovoltaic panel has lower Q<3000W, the system output control end only controls to open the air-cooled evaporation coil branch to supply heat for the building; if the heat load of the building is higher, if Q is more than or equal to 3000W, the air-cooled evaporation coil works alone and cannot meet the heat supply requirement, the output control end of the system opens the PVT evaporation coil branch and the air-cooled evaporation coil branch simultaneously, and the PVT evaporation coil branch and the air-cooled evaporation coil branch work jointly to supply heat for the building. When the solar radiation illumination is higher, for example, S is more than or equal to 200W/m2The photovoltaic panel generates more heat, if the building heat load is lower at the moment, such as Q<3000W, the system output control end only controls opening of a PVT evaporation coil branch to supply heat to the building; if the heat load of the building is high at the moment, if Q is larger than or equal to 3000W, the PVT evaporation coil works alone and can not meet the heat supply requirement, the system output control end opens the PVT evaporation coil branch and the air-cooled evaporation coil branch at the same time, and the PVT evaporation coil branch and the air-cooled evaporation coil branch work jointly to supply heat for the building.
At night, no solar radiation exists, and the air-cooled evaporating coil branch and the PVT evaporating coil branch can absorb heat energy in air to supply heat to the building. When the heat load of the building is small, such as Q' <2000W, the system output control end only controls to open the branch of the air-cooled evaporation coil, and the branch works independently to supply heat to the building; when the heat load Q' of the building is more than or equal to 2000W, the output control end of the system simultaneously opens the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch jointly work to supply heat for the building.
And aiming at the multiple operation modes, whether the outdoor fan operates or not is judged according to the difference value delta T between the evaporation temperature and the outdoor air temperature. Setting start-stop temperature difference delta T0At 5 deg.C, when the system monitors for a Δ T0When the temperature is more than or equal to 5 ℃, the fan does not work; when Δ T0<And when the temperature is 5 ℃, the output control end controls the starting of the fan. Meanwhile, during the operation of the system, if the feedback control module monitors that the indoor return air temperature is not the same as the indoor temperature set by the userFor difference value | Δ Tin|>The system can adjust the rotating speed of the fan, the rotating speed of the compressor and the like at 1 ℃, m is set to be 3.5 in the embodiment, the rotating speed of the compressor is reduced or increased by 3.5%, the heating capacity of the system is further changed, the indoor air temperature is adjusted, and the operation under the state of lowest energy consumption is realized.
Nothing in this specification is said to apply to the prior art.

Claims (4)

1. The utility model provides a solar photovoltaic light and heat pump control system based on load self-adaptation, includes PVT heat pump set and control system, PVT heat pump set includes condenser, compressor, expansion valve, PVT evaporimeter and air-cooled evaporimeter, and control system includes sensing monitoring end, data acquisition module, data processing module, output control end, feedback monitoring end and database module, its characterized in that:
the sensing monitoring end comprises an outdoor temperature monitoring end, a wind speed monitoring end and a solar radiation monitoring end, a small weather station is arranged outdoors and used for monitoring solar radiation, outdoor air temperature and wind speed, and data monitored by the sensing monitoring end and set temperature are used as input ends to be uploaded to the data acquisition module in real time;
the data acquisition module is used for acquiring data monitored by the sensing monitoring end and transmitting the data to the data processing module;
the data processing module receives and processes the data transmitted by the data acquisition module, calculates the heat load of the building according to the indoor and outdoor environmental conditions, compares the heat load with preset data in the database module, namely the heat load of the system under different outdoor environmental conditions and operation modes, thereby obtaining the operation mode of the system under the current indoor and outdoor environmental conditions, and converts the processing result into a control signal to be transmitted to the output control terminal;
the output control end comprises an air-cooled evaporation coil branch control end, a PVT evaporation coil branch control end, an outdoor fan control end, an indoor fan control end, an expansion valve control end and a compressor control end, and controls the opening and closing of two groups of evaporation coil branches, the starting and stopping of a fan, the opening degree of the expansion valve and the rotating speed of the compressor according to control signals transmitted by the data processing module so as to change the operation modes of the system under different working conditions;
the database stores different areas, weather, indoor design parameters, the heat supply amount of the system in the operation mode and corresponding operation strategies;
the feedback monitoring end comprises a temperature monitoring end, a pressure monitoring end and a flow monitoring end, wherein the temperature monitoring end comprises an evaporation and condenser inlet and outlet air temperature monitoring end and a refrigerant temperature monitoring end; a refrigerant flow sensor is arranged at an inlet of the refrigerant coil, temperature and pressure sensors are arranged at an inlet and an outlet of the refrigerant coil, an air flow sensor is arranged at an air inlet of the evaporation condenser and an air inlet of the condenser, and a temperature sensor is arranged at an air inlet and an air outlet of the evaporation condenser and the condenser; the temperature, pressure, the flow that the feedback monitoring end will monitor transmit to data processing module through data acquisition module, whether satisfy the temperature requirement of user setting at data processing module through the inside return air temperature of analysis room and adjust the system operation: if not, the output control end can adjust the heat supply amount of the system by adjusting the rotating speed of the fan, the opening degree of the expansion valve and the rotating speed of the compressor so as to meet the requirement of the user on the thermal environment; if so, the operation is continued with the current scheme.
2. The control system of claim 1, wherein the heat supply in the database comprises heat supply Q from the air-cooled evaporative coil branch control side alone for the daytime systemairSeparately adopting PVT evaporating coil branch control end heat supply quantity QPVTAnd simultaneously adopting two coil branch control ends to supply heat Qair-PVT(ii) a Heat production quantity Q 'of air-cooled evaporation coil branch control end is independently adopted by night system'airHeating quantity Q 'controlled by branch of PVT evaporation coil pipe'PVTAnd two coil branch control end heating quantity Q 'are adopted simultaneously'air-PVT(ii) a The corresponding operation strategies in the database comprise that an air-cooled evaporation coil branch is independently adopted, a PVT evaporation coil branch is independently adopted, and the PVT evaporation coil branch and the air-cooled evaporation coil branch are simultaneously adopted; the heat supply and the operation strategy are obtained by big data statistics according to test and simulation results.
3. A solar photovoltaic photo-thermal heat pump control method based on load self-adaptation is characterized in that the specific control process of the control method is as follows:
in the daytime, the system monitors solar radiation illumination S, outdoor temperature T and outdoor wind speed v parameters, data are transmitted to the data processing module through the data acquisition module, and the data processing module calculates the building heat load Q according to indoor and outdoor environmental conditions; in the operation mode selection process, the system firstly judges whether the solar radiation illumination meets the requirement or not, and then judges the relationship between the heat load and the heat supply load so as to determine the operation mode of the system; when the solar radiation illumination S is less than the solar radiation illumination set value SminIn time, if the building heat load Q is less than the heat supply set value QairThe system output control end controls and opens the air-cooled evaporation coil branch, the branch works independently to supply heat for the building, and the refrigerant in the coil absorbs the heat energy in the air to provide heat for the building; if the building heat load Q is more than or equal to the heat supply set value QairThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to provide heat for the building; when the solar radiation illumination S is more than or equal to the solar radiation illumination set value SminIn time, if the building heat load Q is less than the heat supply set value QPVTThe system output control end controls and opens a PVT evaporation coil branch, the branch works independently to supply heat for the building, the refrigerant in the coil absorbs solar energy and air heat energy simultaneously to supply heat for the building, and meanwhile, electric energy generated by the photovoltaic panel can be used by the system; if the building heat load Q is more than or equal to the heat supply set value QPVTThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to provide heat for the building;
at night, the system monitors outdoor temperature T, data are transmitted to the data processing module through the data acquisition module, and the data processing module calculates building heat load Q' according to indoor and outdoor environmental conditions; the solar radiation illumination S ' is 0 at night, and if the building heat load Q ' is less than the heat supply set value Q 'airSystem ofThe output control end controls and opens the air-cooled evaporation coil branch, the branch works independently to supply heat for the building, and the refrigerant in the coil absorbs the heat energy in the air to provide heat for the building; if the building heat load Q 'is greater than or equal to the heat supply set value Q'airThe system output control end can simultaneously open the PVT evaporating coil branch and the air-cooled evaporating coil branch, and the PVT evaporating coil branch and the air-cooled evaporating coil branch work simultaneously to supply heat for the building;
aiming at multiple operation modes, whether the outdoor fan operates or not is judged according to the difference value delta T between the evaporation temperature and the outdoor air temperature, and the start-stop temperature difference delta T is set0When Δ T is greater than or equal to a set value Δ T0When the fan is started, the fan is not started; when the delta T is smaller than the set value delta T0When the air conditioner is started, the output control end controls the fan to be started, the air flow rate is increased, the convection heat transfer coefficient is increased, and the evaporator absorbs more heat from the air side; meanwhile, during the operation of the system, if the feedback monitoring end monitors that the return air temperature at the indoor side is too high or too low, the system can adjust the rotating speed of the fan and the rotating speed of the compressor, and further adjust the heating capacity of the system.
4. The control method according to claim 3, wherein if the feedback monitoring end monitors that the indoor return air temperature is too high or too low, the specific adjusting mode of the system for adjusting the rotating speed of the fan and the rotating speed of the compressor is as follows: when the indoor side return air temperature is too high, the difference value between the indoor side return air temperature and the indoor set temperature is larger than the set value delta TinWhen the system is used, the rotating speed of the compressor is firstly adjusted, and the rotating speed m% of the compressor is reduced to reduce the heating capacity output by the compressor, so that the heating capacity of the system is reduced until the indoor temperature requirement is met; if the compressor is adjusted to the minimum required speed n0The indoor temperature requirement cannot be met, the system can adjust the rotating speed of the fan, reduce the rotating speed of the fan step by step and weaken the convective heat transfer of air and a refrigerant to reduce the heating capacity until the indoor temperature requirement is met; when the indoor side return air temperature is too low, the difference value between the indoor set temperature and the indoor side return air temperature is larger than the set value delta TinWhen the system is used, the rotating speed of the fan is firstly adjusted, the rotating speed of the fan is gradually increased, and the heat convection coefficient of air and a refrigerant is enhanced until the indoor temperature requirement is met and the indoor temperature is highWind speed not exceeding maximum limit value requirement vmax(ii) a If the fan is adjusted to the highest gear or the indoor wind speed reaches the maximum limit value requirement vmaxThe indoor temperature requirement cannot be met, the system can adjust the rotating speed of the compressor, and the rotating speed m% of the compressor is increased to increase the heating capacity output by the compressor, so that the heating capacity of the system is increased until the indoor temperature requirement is met; if the feedback monitoring end monitors that the indoor return air temperature meets the requirement of the thermal environment, the system continues to operate according to the current scheme.
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