Dual-storage combined cooling and heating system

Abstract

The invention discloses a double-storage combined cooling and heating system, which relates to the technical field of combined cooling and heating, and comprises a variable frequency heat pump, a cold storage device, a heat storage device, a cooling capacity management unit, a heat management unit and a central controller, the variable frequency heat pump is suitable for various energy sources and provided with a cold side heat exchange channel and a hot side heat exchange channel which are independently arranged and connected to the cold storage device and the heat storage device respectively. The cold storage device communicates with the cold quantity management unit and the heat quantity management unit through circulating pipelines; the central controller is electrically connected with the variable-frequency heat pump, the cooling capacity management unit and the heat management unit, and energy storage priority control logic is arranged in the central controller and used for controlling start, stop and operation modes of the variable-frequency heat pump according to the temperature states of the cold storage device and the heat storage device; according to the system, cold and heat independent and combined energy supply can be achieved, the energy efficiency is improved, the operation cost is reduced, and the energy saving performance and intelligent control are improved; the technical problems that an existing heat pump system is difficult to flexibly achieve cold and heat combined supply, energy is wasted, and the overall energy efficiency is low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of combined cooling and heating, and in particular to a dual-storage combined cooling and heating system. Background Art

[0002] As a highly efficient and energy-saving temperature regulation technology, the heat pump system has been widely used in many fields such as building HVAC, domestic hot water and industrial heating. The current mainstream heat pump systems mainly include air source heat pumps, water source heat pumps and ground source heat pumps. Among them, air source heat pumps have become the mainstream choice in residential and commercial fields due to their flexible installation, low cost and strong adaptability. Typical applications include variable frequency heat pump systems, which use the compressor cooling and heating principle to absorb heat from the ambient air through the fin heat exchanger, and then heat the incoming water through the shell and tube heat exchanger to output hot water, achieving efficient heating and cooling. It is suitable for summer, but the hot water consumption is not large and the energy utilization is not complete. Or it can run in reverse, by absorbing heat from the water source and transferring it to the fin heat exchanger to achieve air heating and blow out warm air. It is suitable for winter, but it cannot produce hot water at this time and can only partially function in winter.

[0003] However, most existing heat pump systems only support a single heating or cooling function and cannot achieve flexible switching or parallel energy supply according to the heating and cooling load requirements of the building or user; in seasons where heating and cooling demands are intertwined or coexist (such as spring and autumn or multi-functional building scenarios), single-function heat pump systems are difficult to match actual needs.

[0004] In addition, during the heat-cooling conversion process, the heat pump system lacks intermediate buffering and storage of heat or cooling, which requires the system to work continuously to adjust the output, which not only reduces the energy efficiency ratio (COP) but also increases mechanical wear and energy waste.

[0005] To this end, some research has begun exploring combined cooling and heating technologies, integrating the output capabilities of both cooling and heating sources within a single system and achieving simultaneous cooling and heating through heat recovery or energy management. For example, dual-circuit heat pump systems or the introduction of auxiliary heat storage units for seasonal transitions still present challenges, such as complex structures, difficult control, and low energy storage efficiency. Furthermore, these systems generally lack the ability to flexibly cut off the water supply or evaporator-side circuits based on actual usage needs, causing the heat pump to remain in a long-term cycle of "handling-attenuation-overconsumption," significantly impacting overall energy efficiency and system responsiveness.

[0006] The existing technology has the following technical problems: (1) Traditional heat pump heating or cooling systems have a single function and are unable to meet the needs of coexistence or alternation of cooling and heating; (2) The existing combined cooling and heating technology has a complex structure, lacks energy storage and regulation mechanisms, and has poor matching between cooling and heating outputs; (3) The system lacks intelligent control and cut-off of the water source side or the evaporator side during operation, which easily leads to energy waste; (4) As the operating time of the heat pump increases, the heat / cold transport efficiency decreases significantly, and the system energy efficiency is low.

[0007] In summary, it is found that the existing technology has at least the following technical problems: The existing heat pump system has technical problems such as the inability to flexibly realize the function of combined heating and cooling, insufficient energy utilization resulting in energy waste and low overall system energy efficiency. Summary of the Invention

[0008] The purpose of the present invention is to provide a dual-storage combined heat and cold supply system to solve the technical problems that the existing heat pump system cannot flexibly realize the function of combined heat and cold supply, and has insufficient energy utilization resulting in energy waste and low overall system energy efficiency.

[0009] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention provides a dual-storage combined cooling and heating system, comprising a variable frequency heat pump, a cold storage device, a heat storage device, a cold capacity management unit, a heat management unit and a central controller; the energy source of the variable frequency heat pump is a single water source or a single air source or a water source and an air source, and has a cold side heat exchange passage and a hot side heat exchange passage that are independently arranged, the cold side heat exchange passage is connected to the cold storage device, and the hot side heat exchange passage is connected to the heat storage device; the cold storage device is connected to the cold capacity management unit through a cold circulation pipeline; the heat storage device is connected to the heat management unit through a heat circulation pipeline; the central controller is electrically connected to the variable frequency heat pump, the cold capacity management unit and the heat management unit, and is provided with energy storage priority control logic for controlling the start and stop and operation mode of the variable frequency heat pump based on the temperature status of the cold storage device and the heat storage device; the operation mode includes a single cooling mode, a single heating mode, a combined cooling and heating mode and a standby mode.

[0011] In one embodiment, the cold-side heat exchange path and the hot-side heat exchange path both use a double-tube composite heat exchanger; the cold-side heat exchange path transfers cold energy to the cold storage device through the double-tube composite heat exchanger; and the hot-side heat exchange path transfers heat to the heat storage device through the double-tube composite heat exchanger.

[0012] In one embodiment, the cold management unit includes a first circulation pump, a first three-way mixing valve, a first temperature control valve and at least one cold terminal device; the inlet of the first circulation pump is connected to the water outlet of the cold storage tank, and the outlet is connected to the first inlet of the first three-way mixing valve; the outlet of the first three-way mixing valve is connected to the first temperature control valve, and the first temperature control valve is connected to the cold terminal device; the return end of the cold terminal device is connected to the cold storage tank through the cold return pipeline to form a closed cycle.

[0013] In one embodiment, the cold terminal device includes refrigeration fins and refrigeration coils, which are used to produce cold air and cold water for the cold end.

[0014] In one embodiment, the heat management unit includes a second circulation pump, a second three-way mixing valve, a second temperature control valve and at least one thermal end device; the inlet of the second circulation pump is connected to the water outlet of the heat reservoir, and the outlet is connected to the first inlet of the second three-way mixing valve; the outlet of the second three-way mixing valve is connected to the second temperature control valve, and the second temperature control valve is connected to the thermal end device; the return end of the thermal end device is connected back to the heat reservoir through a heat return pipeline to form a closed cycle.

[0015] In one embodiment, the thermal terminal device includes heating fins and heating coils for producing heating and hot water for the thermal end.

[0016] In one embodiment, the cooling management unit and the heat management unit are respectively provided with a return temperature detection module, an electronic flow control valve and a bypass pipeline; wherein: the return temperature detection modules are respectively arranged on the cooling return pipeline and the heat return pipeline, for detecting the return temperatures of the cold terminal device and the hot terminal device, and feeding back temperature signals to the central controller; the electronic flow control valves are respectively arranged on the water outlet pipeline between the first temperature control valve and the cold terminal device, and on the water outlet pipeline between the second temperature control valve and the hot terminal device, for adjusting the corresponding flow according to the signal of the return temperature detection module, and stably controlling the temperature of the cold terminal device and the hot terminal device; the bypass pipelines are respectively arranged between the second inlet of the first three-way mixing valve and the cooling return pipeline, and between the second inlet of the second three-way mixing valve and the heat return pipeline, for maintaining the system hydraulic balance when the load is unbalanced or the end part is closed, to prevent circulation interruption or pressure difference abnormality.

[0017] In one embodiment, the cooling management unit further includes a first temperature sensor; the heat management unit further includes a second temperature sensor; the first temperature sensor is installed in the cold storage device, and the temperature setting range of the cold storage medium of the cold storage device is 5°C to 10°C; the second temperature sensor is installed in the heat storage device, and the temperature setting range of the heat storage medium of the heat storage device is 25°C to 60°C; the central controller obtains the temperature data of the cold storage device and the heat storage device in real time through the first temperature sensor and the second temperature sensor respectively and uses it to judge the operating status.

[0018] In one embodiment, the central controller is provided with a three-stage timing control function for dividing the daily operating time into three independent time periods, and controlling the operating state of the variable frequency heat pump in each time period according to a preset mode priority rule; wherein: in the first time period, the system is set to prioritize entering the single heat mode or the combined heat and cold supply mode to meet the domestic hot water or heating needs; in the second time period, the system is set to prioritize entering the single cooling mode or the combined heat and cold supply mode to provide the cooling load of the air conditioner; in the third time period, the system is set to enter the combined heat and cold supply mode or the energy storage priority mode to complete the pre-charging of cold water and hot water; the first time period, the second time period and the third time period are set by the user through the central controller, and the operating mode is determined in conjunction with the current temperature status of the cold storage device and the heat storage device.

[0019] In one embodiment, the energy storage priority control logic of the central controller includes: when the temperature of the cold storage device is lower than the lower limit of the cold storage medium temperature setting, or the temperature of the heat storage device is higher than the upper limit of the heat storage medium temperature setting, the variable frequency heat pump is controlled to stop running and the system enters the standby mode; when the temperature of the cold storage device is higher than the cold storage medium temperature setting value and the heat storage device temperature is within the target range, the variable frequency heat pump is controlled to only enable the cold side heat exchange path and the system enters the cooling-only mode; when the temperature of the heat storage device is lower than the heat storage medium temperature setting value and the temperature of the cold storage device is within the target range, The variable frequency heat pump is controlled to only enable the hot side heat exchange path, and the system enters the single heat mode; when the temperature of the cold storage medium in the cold storage device is higher than the set cold storage medium target temperature, and the temperature of the heat storage medium in the heat storage device is lower than the set heat storage medium target temperature, the variable frequency heat pump is controlled to simultaneously enable the cold side heat exchange path and the hot side heat exchange path, and the system enters the combined cooling and heating mode; when it is determined that the current electricity consumption time is in the off-peak period, the variable frequency heat pump is preferentially started until the energy storage media in the cold storage device and the heat storage device reach the set target temperature, and then the variable frequency heat pump is controlled to stop running, and the system enters the standby mode.

[0020] The dual-storage combined cooling and heating system provided by the present invention addresses the problems of existing heat pump systems, such as single function, low energy utilization efficiency, and inflexible system response. It proposes a technical solution that integrates structural optimization with energy-saving operation strategies, and has the following significant beneficial effects: (1) Realizing independent cold and hot paths and combined heat supply capabilities: The present invention sets up a dual independent configuration of the cold side heat exchange path and the hot side heat exchange path, combines the cold storage and heat storage structures, and realizes the flexible switching of the system between single cooling, single heating, and combined cooling and heating, overcoming the functional limitation of the traditional heat pump system that cannot take into account both cold and hot output.

[0021] (2) Improve energy utilization efficiency and load response capability: By setting up cold storage and heat storage, cold and heat are centrally stored during non-load peak hours, and energy storage is given priority during load hours, effectively avoiding the efficiency loss caused by frequent start and stop of variable frequency heat pumps, achieving efficient energy redistribution and utilization, and improving the overall COP value of the system.

[0022] (3) Reduce energy waste and electricity costs: The system can combine electricity price strategies or user settings to use off-peak hours to start the variable frequency heat pump to pre-charge the cold and heat storage devices, effectively reducing operating electricity costs and improving system economy.

[0023] (4) Support intelligent operation control and remote adjustment: The central controller can realize automatic identification and switching of four operation modes (cooling only, heating only, combined supply, and standby), and make decisions based on the energy storage temperature status. It has the ability to connect to remote control and building energy consumption management systems to meet diverse control needs.

[0024] (5) Enhance the stability and adaptability of system operation: By setting up the circulation pump, mixing valve and temperature control device of the cooling management unit and the heat management unit, the stable supply of energy storage medium temperature to the cold / hot end device is guaranteed. At the same time, bypass and flow regulation devices are provided to cope with partial load shutdown or fluctuation of cold and hot loads, so as to achieve dynamic balanced operation of the system.

[0025] In summary, the present invention has advantages in combined cooling and heating capacity, energy efficiency improvement, energy-saving control and intelligent response, and has good industrial application prospects and promotion value in energy-saving electrical appliances and green energy-saving buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1It is a structural schematic diagram of the dual-storage cooling and heating combined supply system of the present invention.

[0028] The accompanying drawings are numerals as follows: 1. Variable frequency heat pump; 11. Cold side heat exchange path; 12. Hot side heat exchange path; 13. Double-tube composite heat exchanger; 2. Cold storage; 3. Heat storage; 4. Cooling management unit; 41. First circulation pump; 42. First three-way mixing valve; 43. First temperature control valve; 44. Cold terminal device; 45. First temperature sensor; 46. Cooling return line; 5. Heat management unit; 51. Second circulation pump; 52. Second three-way mixing valve; 53. Second temperature control valve; 54. Thermal terminal device; 55. Second temperature sensor; 56. Heat return pipeline; 6. Central controller; 71. Reflux temperature detection module; 72. Electronic flow control valve; 73. Bypass pipe. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] In a specific embodiment, a dual-storage combined cooling and heating system is provided, which includes a variable frequency heat pump, a cold storage, a heat storage, a cold management unit, a heat management unit and a central controller; the energy source of the variable frequency heat pump is a single water source or a single air source or a water source and an air source, and has a cold side heat exchange path and a hot side heat exchange path respectively set, which are connected to the cold storage and the heat storage respectively; the cold storage and the heat storage are connected to the cold management unit and the heat management unit respectively through a circulation pipeline; the central controller is electrically connected to the variable frequency heat pump, the cold management unit and the heat management unit, and has an energy storage priority control logic built in to control the start and stop and operation mode of the variable frequency heat pump according to the temperature status of the cold storage and the heat storage; the system can realize independent and combined cooling and heating energy supply, improve energy efficiency and reduce operating costs, and improve energy saving and intelligent control; it effectively solves the technical problems of the existing heat pump system that cannot flexibly realize the function of combined cooling and heating, and has insufficient energy utilization resulting in energy waste and low overall system energy efficiency.

[0031] The first implementation of the dual storage cooling and heating system is as follows Figure 1As shown, it includes a variable frequency heat pump 1, a cold storage device 2, a heat storage device 3, a cold management unit 4, a heat management unit 5 and a central controller 6; the energy source of the variable frequency heat pump 1 is a single water source or a single air source or a water source and an air source, and has a cold side heat exchange passage 11 and a hot side heat exchange passage 12 respectively set independently, the cold side heat exchange passage 11 is connected to the cold storage device 2, and the hot side heat exchange passage 12 is connected to the heat storage device 3; the cold storage device 2 is connected to the cold management unit 4 through a cold circulation pipeline; the heat storage device 3 is connected to the heat management unit 5 through a hot circulation pipeline; the central controller 6 is electrically connected to the variable frequency heat pump 1, the cold management unit 4 and the heat management unit 5, and is provided with energy storage priority control logic for controlling the start and stop and operation mode of the variable frequency heat pump 1 based on the temperature status of the cold storage device 2 and the heat storage device 3; the operation modes include cooling mode only, heating mode only, combined cooling and heating mode and standby mode.

[0032] Among them, when the energy source of the variable frequency heat pump 1 is a water source, the heat exchanger can be installed in groundwater buried deep underground, or in a container for collecting sewage, and the temperature state of the water source can be used to automatically determine whether to absorb its cooling or heat; when the energy source of the variable frequency heat pump 1 is a wind source, the heat exchanger can be installed on the outdoor roof or outdoor exterior wall, and the temperature state of the wind source can be used to automatically determine whether to absorb its cooling or heat.

[0033] The dual-storage combined cooling and heating system of the present invention addresses the problems of existing heat pump systems, such as single function, low energy utilization efficiency, and inflexible system response, and has the following advantages: It achieves independent cooling and heating pathways and combined supply capabilities. By providing a dual independent configuration of the cold-side heat exchange pathway 11 and the hot-side heat exchange pathway 12, combined with the cold storage 2 and heat storage 3 structures, the system can flexibly switch between cooling-only, heating-only, and combined cooling and heating, overcoming the functional limitations of conventional heat pump systems, which cannot provide both cooling and heating outputs. Improve energy utilization efficiency and load response capability. By setting up cold storage 2 and heat storage 3, cold and heat are centrally stored during non-load peak hours, and energy storage is prioritized for supply during load hours. This effectively avoids the efficiency loss caused by the frequent start and stop of the variable frequency heat pump 1, achieves efficient energy redistribution and utilization, and improves the overall COP value of the system. To reduce energy waste and electricity costs, the system can combine electricity price strategies or user settings to use off-peak hours to start the variable frequency heat pump 1 to pre-charge the cold storage 2 and heat storage 3, effectively reducing operating electricity costs and improving system economy. Supports intelligent operation control and remote adjustment, and realizes automatic identification and switching of four operation modes (cooling only, heating only, combined power generation, and standby) through the central controller 6. It also makes decisions based on the energy storage temperature status. It has the ability to connect to remote control and building energy consumption management systems to meet diverse control needs. Enhance system operation stability and adaptability. By setting up the circulation pump, mixing valve and temperature control device of the cooling management unit 4 and the heat management unit 5, the stable temperature supply of the energy storage medium of the cold / hot end device is guaranteed. At the same time, the bypass and flow adjustment devices are provided to cope with partial load shutdown or fluctuations in cooling and heating loads, and achieve dynamic balanced operation of the system. In summary, the present invention has advantages in combined cooling and heating capacity, energy efficiency improvement, energy-saving control and intelligent response, and has good industrial application prospects and promotion value in energy-saving electrical appliances and green energy-saving buildings.

[0034] As one optional implementation method: Regarding the specific structure of the cold side heat exchange passage 11 and the hot side heat exchange passage 12 exchanging energy with the cold storage 2 and the heat storage 3 respectively, this embodiment is as follows: Figure 1 As shown, both the cold-side heat exchange path 11 and the hot-side heat exchange path 12 adopt a double-tube composite heat exchanger 13; the cold-side heat exchange path 11 transfers cold energy to the cold storage device 2 through the double-tube composite heat exchanger 13; the hot-side heat exchange path 12 transfers heat to the heat storage device 3 through the double-tube composite heat exchanger 13.

[0035] During application, the cold-side heat exchange passage 11 and the hot-side heat exchange passage 12 exchange energy with the cold storage 2 and the heat storage 3 respectively through the double-tube composite heat exchanger 13. During the cooling or heating process, the refrigerant or heat medium fluid flows through the inner tube section or the outer tube section of the tube, and exchanges heat with the water medium in the cold storage 2 or the heat storage 3 respectively, thereby realizing efficient transfer of cold or heat. This structure has the advantages of high heat exchange efficiency, clear fluid separation, and compact structure.

[0036] During application, the heat exchange efficiency can be further optimized by designing the inner and outer tube materials (such as copper, stainless steel), tube diameter ratio and spiral winding method of the heat exchanger. It is particularly suitable for integrated equipment with limited space.

[0037] This can solve the problems of unstable heat exchange efficiency and slow hot and cold switching response in traditional heat pump systems, and significantly improve the hot and cold exchange efficiency and system thermal response speed.

[0038] Regarding the specific structure and connection method of the cooling capacity management unit 4, this embodiment Figure 1 As shown, the cold management unit 4 includes a first circulation pump 41, a first three-way mixing valve 42, a first temperature control valve 43 and at least one cold terminal device 44; the inlet of the first circulation pump 41 is connected to the water outlet of the cold storage tank 2, and the outlet is connected to the first inlet of the first three-way mixing valve 42; the outlet of the first three-way mixing valve 42 is connected to the first temperature control valve 43, and the first temperature control valve 43 is connected to the cold terminal device 44; the return end of the cold terminal device 44 is connected to the cold storage tank 2 through the cold return pipeline 46 to form a closed cycle.

[0039] Among them, the pipe connecting the cold storage device 2 and the components of the cold management unit 4 is the cold circulation pipeline; the energy storage medium used in the cold storage device 2 can be a medium with high specific heat capacity such as water, ethylene glycol aqueous solution, and brine.

[0040] Furthermore, the cold terminal device 44 includes refrigeration fins and refrigeration coils, which are used to produce cold air and cold water for the cold end; multiple refrigeration fins and refrigeration coils can be provided; the refrigeration fins can be fins in an air conditioner, which are used to produce air-conditioned cold air for the room; the refrigeration coil can be connected to a shell and tube heat exchanger to cool the incoming water to form cold water; the refrigeration coil can even be installed in an ice maker to provide a cold source for making ice cubes for food.

[0041] During application, the cold water management unit 4 serves as the main control path for cold water output and regulation. The first circulation pump 41 extracts the energy storage medium from the cold storage tank 2, which passes through the three-way mixing valve and the temperature control valve in turn and enters the cold terminal device 44. Finally, the energy storage medium returns to the cold storage tank 2 after being used by the terminal, forming a closed cooling supply circuit; this structure enables the energy storage medium to be supplied at a constant pressure and in a constant quantity between each terminal (such as the air-conditioning fin coil, refrigeration unit, cooling equipment), effectively avoiding problems such as excessive pressure difference and temperature difference fluctuation in the cold water management unit 4 and the cold circulation pipeline; the cold water transfer path is clear, which is conducive to dynamic temperature control and energy-saving adjustment.

[0042] In applications, multi-terminal time-sharing control can be achieved by setting up a bypass regulation loop or adding a partition flow control module, which is conducive to meeting the needs of changing cooling loads in multiple areas of the building.

[0043] Regarding the specific structure and connection method of the thermal management unit 5, this embodiment Figure 1 As shown, the heat management unit 5 includes a second circulation pump 51, a second three-way mixing valve 52, a second temperature control valve 53 and at least one thermal terminal device 54; the inlet of the second circulation pump 51 is connected to the water outlet of the heat reservoir 3, and the outlet is connected to the first inlet of the second three-way mixing valve 52; the outlet of the second three-way mixing valve 52 is connected to the second temperature control valve 53, and the second temperature control valve 53 is connected to the thermal terminal device 54; the return end of the thermal terminal device 54 is connected back to the heat reservoir 3 through the heat return pipe 56, forming a closed cycle.

[0044] Among them, the pipe connecting the heat storage device 3 and the components of the heat management unit 5 is the heat circulation pipeline; the energy storage medium used in the heat storage device 3 can be a medium with high specific heat capacity such as water, ethylene glycol aqueous solution, and brine.

[0045] Furthermore, the thermal terminal device 54 includes heating fins and heating coils, which are used to produce heat and hot water for the hot end; multiple heating fins and heating coils can be provided; the heating fins can be fins in an air conditioner, which are used to produce heat for the room; the heating coil can be connected to a shell and tube heat exchanger to heat the incoming water to form hot water, which is used to provide hot water for bathroom or food; the heating coil can even be installed in the floor to form floor heating for the room to produce heat.

[0046] During application, the heat management unit 5 transports the energy storage medium in the heat storage tank 3 to the heating terminal device 54 (such as heating fins, floor heating coils, hot water appliances, etc.) through the second circulation pump 51, and adjusts the mixing temperature of the energy storage medium through the three-way mixing valve. Finally, the energy storage medium flows back to the heat storage tank 3 after completing the heating, forming a stable closed-loop heating path; this structure can achieve constant regulation of the energy storage medium temperature output from the heat storage tank 3 and quickly respond to the user's heating needs. The mixing ratio can be controlled by the reflux temperature detection module 71, and the heat output of the heating coil of the heat terminal device 54 is adjusted to prevent the high-temperature energy storage medium from outputting too much heat, causing the water temperature output from the shell and tube heat exchanger to be too high, resulting in scalding or uneven heat. It is especially suitable for high-comfort demand scenarios such as bathing and floor heating.

[0047] Regarding the temperature control and pressure balance structure of the terminal device of the cooling management unit 4 and the heat management unit 5, this embodiment is as follows. Figure 1 As shown, the cooling management unit 4 and the heat management unit 5 are respectively provided with a return temperature detection module 71 , an electronic flow control valve 72 and a bypass pipeline 73 .

[0048] Among them: the return temperature detection module 71 is respectively arranged on the cold return pipeline 46 and the heat return pipeline 56, for detecting the return temperature of the cold terminal device 44 and the hot terminal device 54, and feeding back the temperature signal to the central controller 6; the electronic flow control valve 72 is respectively arranged on the water outlet pipeline between the first temperature control valve 43 and the cold terminal device 44, and on the water outlet pipeline between the second temperature control valve 53 and the hot terminal device 54, for adjusting the corresponding flow according to the return temperature signal, and stably controlling the temperature of the cold terminal device 44 and the temperature of the hot terminal device 54; the bypass pipeline 73 is respectively arranged between the second inlet of the first three-way mixing valve 42 and the cold return pipeline 46, and between the second inlet of the second three-way mixing valve 52 and the heat return pipeline 56, for maintaining the system hydraulic balance when the load is unbalanced or the end part is closed, to prevent circulation interruption or abnormal pressure difference.

[0049] During application, the return temperature detection module 71 cooperates with the electronic flow control valve to monitor the terminal energy storage medium temperature of the cold terminal device 44 and the hot terminal device 54 in real time and feed it back to the central controller 6; when the load of a certain terminal changes or the temperature of the energy storage medium deviates from the target value, the system automatically adjusts the valve opening and the pump speed to maintain a constant supply of energy storage medium temperature and return balance; the bypass line 73 is set to ensure the stability of the energy storage medium circulation pressure on the pipeline when the system is running at low load or some terminal cold or hot devices are closed, to avoid large system pressure difference due to local loop closure, causing local water hammer or circulation interruption; this structure can significantly improve the stability of the system energy supply, adapt to complex and large cold or hot terminal usage scenarios, extend the life of the variable frequency heat pump 1, cold storage device 2, heat storage device 3 and the pipeline network, and is particularly suitable for large buildings with many cold and heating terminal partitions and large load differences.

[0050] The cooling management unit 4 and the heat management unit 5 cooperate with the central controller 6 to control the setting of the energy storage temperature of the cold storage 2 and the heat storage 3. Figure 1 As shown, the cooling management unit 4 also includes a first temperature sensor 45; the heat management unit 5 also includes a second temperature sensor 55; the first temperature sensor 45 is installed in the cold storage 2, and the temperature setting range of the cold storage medium of the cold storage 2 is 5°C to 10°C; the second temperature sensor 55 is installed in the heat storage 3, and the temperature setting range of the heat storage medium of the heat storage 3 is 25°C to 60°C; the central controller 6 obtains the temperature data of the cold storage 2 and the heat storage 3 in real time through the first temperature sensor 45 and the second temperature sensor 55 respectively and uses it to judge the operating status.

[0051] During application, the first temperature sensor 45 and the second temperature sensor 55 monitor the energy storage medium temperature of the cold storage device 2 and the heat storage device 3 in real time. The central controller 6 determines the current energy storage state according to the set target range (cold storage medium temperature 5-10°C, heat storage medium temperature 25-60°C); when the set target is reached, the operation of the main unit of the variable frequency heat pump 1 is automatically stopped to realize energy storage cut-off control.

[0052] During off-peak hours, the central controller 6 can actively start the variable frequency heat pump 1 for cooling and heating, and give priority to raising or lowering the temperature of the energy storage medium in the cold storage device 2 and the heat storage device 3 to the target value, making full use of low-priced electricity to complete energy storage, and directly call the stored cold / heat when the load is high during the day, avoiding frequent starting and stopping of the variable frequency heat pump 1.

[0053] This energy storage solution can effectively achieve "peak-shaving use" and "optimization of electricity costs" of energy, significantly improving the system's economy and intelligent energy efficiency control level.

[0054] The energy storage priority control logic of the central controller 6 is specifically as follows: when the temperature of the cold storage 2 is lower than the lower limit of the cold storage medium temperature setting, or the temperature of the heat storage 3 is higher than the upper limit of the heat storage medium temperature setting, the variable frequency heat pump 1 is controlled to stop running and the system enters the standby mode; when the temperature of the cold storage 2 is higher than the cold storage medium temperature setting value, and the temperature of the heat storage 3 is within the target range, the variable frequency heat pump 1 is controlled to only enable the cold side heat exchange path 11, and the system enters the single cooling mode; when the temperature of the heat storage 3 is lower than the heat storage medium temperature setting value, and the temperature of the cold storage 2 .... When the temperature of the cold storage medium in the cold storage device 2 is higher than the set target temperature of the cold storage medium, and the temperature of the heat storage medium in the heat storage device 3 is lower than the set target temperature of the heat storage medium, the variable frequency heat pump 1 is controlled to activate both the cold side heat exchange path 11 and the hot side heat exchange path 12 at the same time, and the system enters the combined cooling and heating mode. When it is determined that the current electricity consumption time is in the off-peak period, the variable frequency heat pump 1 is started first until the energy storage media in the cold storage device 2 and the heat storage device 3 reach the set target temperature, and then the variable frequency heat pump 1 is controlled to stop running, and the system enters the standby mode.

[0055] When the application is in progress, the central controller 6 dynamically selects the operating mode of the system according to the temperature of the energy storage medium in the cold storage 2 and the heat storage 3: (1) the cold storage 2 reaches a specified low temperature, and the heat storage 3 reaches a specified high temperature → the heat pump stops and the system enters the standby energy-saving state; (2) The temperature of the cold storage device 2 is high → the cold side heat exchange path 11 of the variable frequency heat pump 1 is started, and the system enters the cooling-only mode; (3) The temperature of the heat storage 3 is low → the hot side heat exchange path 12 of the variable frequency heat pump 1 is started, and the system enters the single heat mode; (4) The temperature of the cold storage tank 2 is high and the temperature of the heat storage tank 3 is low → Start the variable frequency heat pump 1 and open the cold side and hot side heat exchange paths 12 at the same time, entering the combined cooling and heating mode; (5) Determine that the current electricity consumption period is off-peak → Even in the non-load period, the variable frequency heat pump 1 is started first to store the cold storage medium and the heat storage medium.

[0056] This energy storage priority control strategy combines energy storage status and electricity price factors, comprehensively balances energy efficiency, response speed and operating costs, achieves dynamic optimal operation, adapts to multi-scenario and all-time operation needs, and is one of the key technologies for realizing intelligent energy-efficient building combined heating and cooling systems.

[0057] The second embodiment of the dual-storage combined cooling and heating system is different from the first embodiment in that the central controller 6 is provided with a three-stage timing control function for dividing the daily operating time into three independent time periods and controlling the operating state of the variable frequency heat pump 1 according to the preset mode priority rules within each time period.

[0058] Among them: during the first time period, the system is set to prioritize entering the single heat mode or the combined heat and cold supply mode to meet the domestic hot water or heating needs; during the second time period, the system is set to prioritize entering the single cooling mode or the combined heat and cold supply mode to provide the cooling load of the air conditioner; during the third time period, the system is set to enter the combined heat and cold supply mode or the energy storage priority mode to complete the pre-charging of cold water and hot water; the first time period, the second time period and the third time period are set by the user through the central controller 6, and the operating mode is determined in conjunction with the current temperature status of the cold storage device 2 and the heat storage device 3.

[0059] When applied, the three-stage timing control function of the central controller 6 is used to divide the daily operation time of the dual-storage cooling and heating system into three user-defined time periods, for example, the first time period is 06:00-09:00, the second time period is 10:00-17:00, and the third time period is 18:00-24:00. The specific time range can be set through the touch interface of the central controller 6, the upper computer communication interface, and the wireless module connected to the background control terminal for setting; The dual-storage combined cooling and heating system automatically schedules its operating status according to the corresponding mode priority rules in different time periods: (1) In the first time period, the central controller 6 prioritizes the domestic hot water or heating demand and automatically selects the single heat mode or the combined heat and cold supply mode according to the temperature status of the heat storage 3 to ensure the supply of hot water and heating during the morning peak period; (2) In the second time period, the system will preferentially enter the cooling mode or the combined cooling and heating mode to provide stable cooling for office, commercial or residential spaces to meet the daytime air conditioning load demand; (3) In the third time period, the system enters the combined cooling and heating or energy storage priority mode, actively charging cold / heat into the cold storage 2 and heat storage 3 to form a pre-energy storage preparation to support the use of cooling and heating during the morning peak of the next day.

[0060] The automatic judgment of the above-mentioned mode is based on the current time period as the main control condition, and is jointly judged in combination with the current upper and lower temperature limits of the cold storage device 2 and the heat storage device 3; for example, in the second time period, if the temperature of the cold storage medium of the cold storage device 2 has reached the target value and the temperature of the heat storage medium of the heat storage device 3 is low, the system will switch to the single heat mode; in the third time period, if both the cold and the heat are not up to standard, the system will simultaneously start the cold and hot heat exchange paths to enter the joint power supply state; between 24:00 and 5:00 in the morning, priority is given to cold and hot dual energy storage during the off-peak period at night.

[0061] The three-stage timed operation strategy of this embodiment can flexibly configure the operation time and strategy according to different scenarios (such as residences, office buildings, and hospitals), thereby improving the response matching degree of the dual-storage combined heating and cooling system to user behavior patterns.

[0062] Through structured management of daily operating hours, the operation and scheduling of the dual-storage combined heat and cooling system is made more intelligent, precise, and energy-efficient. This effectively solves the problem of delayed switching response or a single operating strategy in traditional heat pump systems under multiple working conditions. At the same time, it optimizes the energy pre-storage strategy during off-peak hours, reduces operating energy consumption costs, and improves economic efficiency. It also avoids conflicts between hot and cold or frequent start-up and shutdown of the main unit, thereby improving equipment stability and service life.

[0063] The technical features of the above embodiments may be combined arbitrarily. To simplify the description, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A dual-storage cooling and heating system, characterized in that: It includes variable frequency heat pump, cold storage, heat storage, cooling management unit, heat management unit and central controller; The energy source of the variable frequency heat pump is a single water source or a single wind source or a water source and a wind source, and has a cold side heat exchange path and a hot side heat exchange path that are independently provided, the cold side heat exchange path is connected to the cold storage device, and the hot side heat exchange path is connected to the heat storage device; The cold storage device is connected to the cold management unit through a cold circulation pipeline; the heat storage device is connected to the heat management unit through a hot circulation pipeline; The central controller is electrically connected to the variable frequency heat pump, the cooling capacity management unit and the heat management unit, and is provided with energy storage priority control logic for controlling the start and stop and operating mode of the variable frequency heat pump based on the temperature status of the cold storage and the heat storage; the operating modes include cooling-only mode, heating-only mode, combined cooling and heating mode and standby mode.

2. The dual-storage cooling and heating combined supply system according to claim 1, characterized in that: The cold side heat exchange passage and the hot side heat exchange passage both adopt double-tube composite heat exchangers; The cold side heat exchange path transfers cold energy to the cold storage device through a double-tube composite heat exchanger; the hot side heat exchange path transfers heat energy to the heat storage device through a double-tube composite heat exchanger.

3. The dual-storage cooling and heating combined supply system according to claim 2, characterized in that: The cold management unit includes a first circulation pump, a first three-way mixing valve, a first temperature control valve and at least one cold terminal device; The inlet of the first circulation pump is connected to the water outlet of the cold storage tank, and the outlet is connected to the first inlet of the first three-way mixing valve; the outlet of the first three-way mixing valve is connected to the first temperature control valve, and the first temperature control valve is connected to the cold terminal device; the return end of the cold terminal device is connected to the cold storage tank through a cold return pipeline to form a closed cycle.

4. The dual-storage cooling and heating combined supply system according to claim 3, characterized in that: The cold terminal device includes refrigeration fins and refrigeration coils, which are used to produce cold air and cold water for the cold end.

5. The dual-storage cooling and heating combined supply system according to claim 3, characterized in that: The heat management unit includes a second circulation pump, a second three-way mixing valve, a second temperature control valve and at least one thermal terminal device; The inlet of the second circulation pump is connected to the water outlet of the heat reservoir, and the outlet is connected to the first inlet of the second three-way mixing valve; the outlet of the second three-way mixing valve is connected to the second temperature control valve, and the second temperature control valve is connected to the thermal terminal device; the return end of the thermal terminal device is connected back to the heat reservoir through a heat return pipeline to form a closed cycle.

6. The dual-storage cooling and heating combined supply system according to claim 5, characterized in that: The heat terminal device includes heating fins and heating coils, which are used to produce heating and hot water for the heat end.

7. The dual-storage cooling and heating combined supply system according to claim 5, characterized in that: The cooling management unit and the heat management unit are respectively provided with a return temperature detection module, an electronic flow control valve and a bypass pipeline; Wherein: the return temperature detection modules are respectively arranged on the cold return pipeline and the heat return pipeline, for detecting the return temperature of the cold terminal device and the hot terminal device, and feeding back temperature signals to the central controller; The electronic flow regulating valves are respectively arranged on the water outlet pipe between the first temperature control valve and the cold terminal device, and on the water outlet pipe between the second temperature control valve and the hot terminal device, for adjusting the corresponding flow rate according to the signal of the return temperature detection module, so as to stably control the temperature of the cold terminal device and the hot terminal device; The bypass lines are respectively arranged between the second inlet of the first three-way mixing valve and the cold return line, and between the second inlet of the second three-way mixing valve and the heat return line, and are used to maintain the system hydraulic balance when the load is unbalanced or the end part is closed to prevent circulation interruption or abnormal pressure difference.

8. The dual-storage cooling and heating combined supply system according to claim 7, characterized in that: The cooling management unit further includes a first temperature sensor; the heat management unit further includes a second temperature sensor; The first temperature sensor is installed in the cold storage device, and the temperature setting range of the cold storage medium of the cold storage device is 5°C to 10°C; the second temperature sensor is installed in the heat storage device, and the temperature setting range of the heat storage medium of the heat storage device is 25°C to 60°C; the central controller obtains the temperature data of the cold storage device and the heat storage device in real time through the first temperature sensor and the second temperature sensor respectively, and uses them to judge the operating status.

9. The dual-storage cooling and heating combined supply system according to claim 8, characterized in that: The central controller is provided with a three-stage timing control function for dividing the daily operating time into three independent time periods and controlling the operating state of the variable frequency heat pump according to a preset mode priority rule within each time period; Among them: during the first time period, the system is set to prioritize the heat-only mode or the combined heat and cold supply mode to meet the domestic hot water or heating needs; during the second time period, the system is set to prioritize the cooling-only mode or the combined heat and cold supply mode to provide the cooling load of the air conditioner; during the third time period, the system is set to prioritize the combined heat and cold supply mode or the energy storage priority mode to complete the pre-charging of cold and hot water; The first time period, the second time period and the third time period are set by the user through the central controller, and the operation mode is determined in conjunction with the current temperature status of the cold storage device and the heat storage device.

10. The dual-storage cooling and heating combined supply system according to claim 8, characterized in that: The energy storage priority control logic of the central controller includes: When the temperature of the cold storage device is lower than the lower limit of the cold storage medium temperature setting, or the temperature of the heat storage device is higher than the upper limit of the heat storage medium temperature setting, the variable frequency heat pump is controlled to stop running and the system enters the standby mode; When the temperature of the cold storage device is higher than the set value of the cold storage medium temperature and the temperature of the heat storage device is within the target range, the variable frequency heat pump is controlled to only enable the cold side heat exchange path, and the system enters the cooling-only mode; When the temperature of the heat storage device is lower than the set value of the heat storage medium temperature and the temperature of the cold storage device is within the target range, the variable frequency heat pump is controlled to only enable the hot side heat exchange path, and the system enters the single heat mode; When the temperature of the cold storage medium in the cold storage device is higher than the set cold storage medium target temperature, and the temperature of the heat storage medium in the heat storage device is lower than the set heat storage medium target temperature, the variable frequency heat pump is controlled to simultaneously enable the cold side heat exchange path and the hot side heat exchange path, and the system enters the combined cooling and heating mode; When it is determined that the current electricity usage time is off-peak, the variable frequency heat pump is started first until the energy storage medium in the cold storage device and the heat storage device reaches the set target temperature, and then the variable frequency heat pump is controlled to stop running and the system enters the standby mode.

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