Energy storage interconnection heat pump system utilizing heat storage material

Abstract

The utility model discloses an energy storage interconnected heat pump system utilizing a heat storage material, and belongs to the technical field of heat pump energy conservation. Comprising an air source heat pump, an energy storage module, a high-temperature screw water-water heat pump, a circulating water pump and user heating end equipment. The air source heat pump uses air as a heat source through refrigerant circulation and compression, and low-grade heat energy is used for heating through circulation heat exchange; the energy storage module stores redundant heat at high temperature to supplement insufficient heat supply at low temperature; the high-temperature screw water-water heat pump uses heat in the energy storage module as a heat source, and the heating pressure of the heat pump unit is further reduced. The circulating water pump maintains water circulation; and finally, the user tail end heating equipment provides heat for the heat users in a convection or radiation mode. According to the system, the air source heat pump can be always kept efficient, safe and stable during working, the working pressure of the air source heat pump is reduced, the overall energy consumption of the system is reduced, the final outlet water temperature of the system is increased, and the problem that a pure air source heat pump system is large in occupied area is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump energy saving, and in particular to an energy storage interconnected heat pump system utilizing heat storage materials. Background Art

[0002] Wind energy, solar energy, hydropower and nuclear energy will dominate the development of electricity, and coal-fired generators will be reduced to peak-shaving generators. This will promote the energy structure to develop in a cleaner and more sustainable direction. However, heating in northern cities in my country still mainly relies on coal as the main energy source. The demand for coal for winter heating is huge, and it also brings serious air pollution problems.

[0003] Against this backdrop, China has achieved its goal of electrifying every village, and the national power grid has been built with full power transmission capacity. This is an important milestone, which indicates that China has the infrastructure for full electrification. The infrastructure for electric heating is already in place, and the future direction of heating is clearly electric heating. This is an important trend that will further promote the transformation of China's energy consumption structure towards electricity.

[0004] However, existing electric heating systems, especially air source heat pump systems, have some key limitations and challenges. First, the heating temperature of the air source heat pump system is relatively low, and it may not provide enough heat to meet user needs in cold weather conditions. Secondly, the energy efficiency of the air source heat pump system decreases at night when the temperature is lower, which means that the system needs to consume more electricity at night to provide the same amount of heat. Finally, the air source heat pump system equipment needs to be set up outdoors, and the units must be set according to the required maximum cooling and heating loads. The idle rate is too high and it takes up a lot of space, which is particularly problematic in urban environments with limited space. Utility Model Content

[0005] In order to solve the above-mentioned problems in the background technology, the utility model proposes an energy storage interconnected heat pump system using heat storage materials.

[0006] The utility model is realized through the following technical solutions:

[0007] An energy storage interconnected heat pump system using heat storage materials comprises: an air source heat pump (1), an energy storage module (4), a high-temperature screw water-water heat pump (7), a circulating water pump, and a user heating terminal device (9), wherein:

[0008] The outlet of the air source heat pump (1) is divided into two branches, one branch is connected to the inlet of the user heating terminal device (9) via the first heat pump valve (2-1) and the second circulating water pump (5), and the outlet of the user heating terminal device (9) is connected to the inlet of the air source heat pump (1) via the second heat pump valve (2-2), forming a loop; the other branch of the outlet of the air source heat pump (1) is connected to the a interface of the energy storage module (4) via the first circulating water pump (3), and the d interface of the energy storage module (4) is connected to the inlet of the air source heat pump (1); The b interface of the energy storage module (4) is connected to the water inlet of the high-temperature screw water-water heat pump (7) via the first energy storage valve (6-1); the water outlet of the high-temperature screw water-water heat pump (7) is connected to the water inlet of the user heating terminal device (9) via the third circulating water pump (8); the water outlet of the user heating terminal device (9) is connected via the return water inlet and return water outlet of the high-temperature screw water-water heat pump (7), the second energy storage valve (6-2), and the c interface of the energy storage module (4); and the d interface of the energy storage module (4) is connected to the inlet of the air source heat pump (1).

[0009] The air source heat pump (1) circulates and compresses the refrigerant, uses the air as a heat source, and uses the low-grade heat energy in the air for heating needs of heat users through cyclic heat exchange; the energy storage module stores the excess heat generated by the high-efficiency heating capacity of the air source heat pump at high ambient temperature during the day, and uses it to supplement the insufficient heating capacity of the air source heat pump system at low ambient temperature; the high-temperature screw water-water heat pump can use the heat stored in the energy storage module as a heat source, and further heat the circulating water in the pipeline to the required temperature for heating by compressing, cooling and releasing heat on the refrigerant, thereby reducing the heating pressure of the air source heat pump unit; the circulating water pump is used to maintain the circulation of water in the pipeline system to ensure that hot water can be effectively transported to the required pipeline; the user-end heating equipment provides the heat in the heating pipeline to the heat user through convection heat exchange or radiation heat exchange. The specific equipment can be selected by the heat user, such as fan coil units, floor heating pipes or radiators.

[0010] The energy storage interconnected heat pump system using heat storage materials is characterized in that the air source heat pump adopts an ordinary scroll compressor. Since the energy storage module and the high-temperature screw water-water heat pump are added to the system for auxiliary heating, the compressor can always be in a safe, efficient and stable operating range during operation, thereby improving equipment reliability, greatly reducing failure rate and extremely low maintenance costs.

[0011] The energy storage module in the energy storage interconnected heat pump system using heat storage materials is equipped with an ice storage ball encapsulated with an inorganic salt material. This material undergoes phase change at 27°C, and its latent heat is 44.5 kWh / m 3, while the solid sensible heat and liquid sensible heat are 0.86kWh / ℃ and 1.04kWh / ℃ respectively. When phase change occurs, its solidification rate is 1.6kW / ℃, and its dissolution rate is 2.2kW / ℃. The material toxicity LD50 value is 2.5inmg / kg, which can effectively absorb heat and has good environmental friendliness. It has four interfaces a, b, c, and d. The two interfaces a and d are connected to the air source heat pump, and the interfaces b and c are connected to the high-temperature screw water-water heat pump. When the air source heat pump can provide enough heat, hot water flows in from port a and returns to the air source heat pump from port d (the first energy storage valve and the second energy storage valve are closed) to store the heat. When the ambient temperature is low, hot water flows in from port a and flows out from port b, then flows through the high-temperature screw water-water heat pump and the user heating terminal equipment in turn, then flows in from port c and flows out through port d to return to the air source heat pump, and releases the stored heat for heating.

[0012] The high-temperature screw water-water heat pump in the energy storage interconnected heat pump system using thermal storage materials can achieve a water temperature of 50°C on the inlet side and 65°C on the outlet side through intelligent control. Without increasing additional investment costs, the heat pump equipment can stably supply water at 65°C and return water at 50°C, achieving a large temperature difference and a small flow rate to ensure the heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a pure air source heat pump heating mode of an energy storage interconnected heat pump system utilizing heat storage materials provided by the utility model.

[0014] Figure 2 A schematic diagram of an interconnected heating mode of an energy storage interconnected heat pump system utilizing heat storage materials provided by the utility model.

[0015] Figure markings: 1-air source heat pump; 2-1-first heat pump valve, 2-2-second heat pump valve; 3-first circulating water pump; 4-energy storage module; 5-second circulating water pump; 6-1-first energy storage valve, 6-2-second energy storage valve; 7-high-temperature screw water-water heat pump; 8-third circulating water pump; 9-user heating terminal equipment; 10-heat user. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the present invention, its specific implementation method will be described in detail below with reference to the accompanying drawings.

[0017] Please see attached Figure 1As shown, the utility model is an energy storage interconnected heat pump system using heat storage materials, including the air source heat pump 1, the valves 2-1, 2-2, the circulating water pump 3, the energy storage module 4, the circulating water pump 5, the first energy storage valve 6-1, the second energy storage valve 6-2, the high-temperature screw water-water heat pump 7, the third circulating water pump 8, the user heating terminal equipment 9, and the heat user 10. Among them:

[0018] The air source heat pump 1 changes the phase and temperature of the refrigerant by circulating and compressing the refrigerant, and uses air as a heat source through a heat exchanger, and converts low-grade heat energy in the air into high-grade heat energy that can be used to meet heating needs through circulating heat exchange; the valves 2-1, 2-2 and valves 6-1, 6-2 can switch the pipelines in the system by opening and closing to achieve pipeline switching in the system; the first circulating water pump 3, the second circulating water pump 5, and the third circulating water pump 8 pressurize the hot water in the pipeline to achieve circulating flow heat exchange of the hot water in the pipeline; the energy storage module 4 uses the ice storage ball contained inside to transfer the heat generated by the air source heat pump 1 to the heat exchanger. The amount is stored to serve as the heat source of the high-temperature screw water-to-water heat pump 7 when its heat production is insufficient to meet the heating demand of the heat user 10; the high-temperature screw water-to-water heat pump 7 can further heat the hot water heated by flowing through the energy storage module 4 to the temperature required by the heat user 10 when the air source heat pump 1 is insufficient to provide hot water of sufficient temperature, thereby reducing the working pressure of the air source heat pump 1; the user heating terminal device 9 can provide the heat carried by the hot water in the system to the heat user 10 by means of convection heat exchange and radiation heat exchange, and the specific equipment can be selected by the heat user, such as fan coil units, floor heating pipes or radiators.

[0019] The energy storage interconnected heat pump system using heat storage materials described above has two working modes: pure air source heat pump heating mode and interconnected heating mode.

[0020] Pure air source heat pump heating mode: When the ambient temperature is high and the air source heat pump 1 has high working efficiency and is sufficient to meet the heating demand of the heat user 10, the first circulating water pump 3 is turned on, the first energy storage valve 6-1 and the second energy storage valve 6-2 are closed, the high-temperature screw water-water heat pump 7 is in a closed state, the first heat pump valve 2-1, the second heat pump valve 2-2, and the second circulating water pump 5 are in an open state, and the hot water provided by the air source heat pump 1 flows in from port a and out from port d back to the air source heat pump. At the same time, all the heating needs of the heat user 10 are provided by the air source heat pump 1, and the excess heat is stored by the energy storage module 4.

[0021] Interconnected heating mode: When the ambient temperature is low and the air source heat pump 1 is insufficient to provide sufficient heat to supply the heat user 10, the first heat pump valve 2-1, the second heat pump valve 2-2 and the second circulating water pump 5 are in a closed state, and the second circulating water pump 3, the first energy storage valve 6-1, the second energy storage valve 6-2, the high-temperature screw water-water heat pump 7 and the third circulating water pump 8 are in an open state. The hot water heated by the air source heat pump 1 flows through port a of the energy storage module 4 and flows out through port b to absorb heat, and then is further heated by the high-temperature screw water-water heat pump 7 to reach the required temperature to supply the heat user 10, and then flows through the high-temperature screw water-water heat pump 7, flows into through port c, and then returns to the air source heat pump through port d.

[0022] The energy storage interconnected heat pump system using heat storage materials is characterized in that the air source heat pump 1 adopts an ordinary scroll compressor. Since the energy storage module 4 and the high-temperature screw water-water heat pump 7 are added to the system for auxiliary heating, the compressor can always be in a safe, efficient and stable operating range during operation, thereby improving the reliability of the equipment, greatly reducing the failure rate and extremely low maintenance costs.

[0023] The energy storage module 4 in the energy storage interconnected heat pump system using heat storage materials is equipped with an ice ball encapsulated with an inorganic salt material. This material undergoes phase change at 27°C, and its latent heat is 44.5 kWh / m 3 , while the solid sensible heat and liquid sensible heat are 0.86kWh / ℃ and 1.04kWh / ℃ respectively. When phase change occurs, its solidification rate is 1.6kW / ℃, and the dissolution rate is 2.2kW / ℃. The material toxicity LD50 value is 2.5inmg / kg, which can effectively absorb heat and has good environmental friendliness. It has four interfaces a, b, c, and d. The two interfaces a and d are connected to the air source heat pump 1, and the c and b interfaces are connected to the high-temperature screw water-water heat pump 7. When the air source heat pump 1 can provide enough heat, hot water flows in from port a and then returns to the air source heat pump 1 through port d to store the heat. When the ambient temperature is low, hot water flows in from port a, flows out from port b, flows through the high-temperature screw water-water heat pump 7 and the user heating terminal equipment 9, and then flows in from port c and flows out through port d to return to the air source heat pump 1 to release the stored heat for heating.

[0024] The high-temperature screw water-water heat pump 7 in the energy storage interconnected heat pump system using heat storage materials can achieve a water temperature of 50°C on the inlet side and 65°C on the outlet side through intelligent control. Without increasing additional investment costs, the heat pump equipment can stably supply water at 65°C and return water at 50°C, achieving a large temperature difference and a small flow rate to ensure the heating effect.

[0025] In summary, the utility model provides an energy storage interconnected heat pump system using heat storage materials. By connecting an energy storage module and a high-temperature screw water-water heat pump in series in an ordinary air source heat pump system, the air source heat pump always maintains an efficient, safe and stable working range during operation, reducing the working pressure of the air source heat pump, improving its working reliability, reducing the overall energy consumption of the system and improving the final water outlet temperature of the system. At the same time, the addition of the energy storage module and the high-temperature screw water-water heat pump can greatly reduce the number of air source heat pump units, and the energy storage module and the high-temperature screw water-water heat pump can be installed indoors, which can solve the problem of large footprint of the pure air source heat pump system. In addition, the use of an ordinary air source heat pump system in the system also provides the possibility of upgrading the old air source heat pump heating system, and provides support for further promoting the transformation of China's energy consumption structure towards electricity.

[0026] The above implementation is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited to the above embodiment. Any other modifications, equivalent replacements, modifications, substitutions, combinations, and simplifications made within the spirit and principles of the present creation shall be equivalent replacement methods and shall be included in the protection scope of the present utility model.

Claims

1. An energy storage interconnected heat pump system using heat storage materials, characterized in that: include: Air source heat pump (1), energy storage module (4), high temperature screw water-water heat pump (7), circulating water pump, user heating terminal equipment (9), wherein: The outlet of the air source heat pump (1) is divided into two branches, one branch is connected to the inlet of the user heating terminal device (9) via the first heat pump valve (2-1) and the second circulating water pump (5), and the outlet of the user heating terminal device (9) is connected to the inlet of the air source heat pump (1) via the second heat pump valve (2-2), forming a loop; the other branch of the outlet of the air source heat pump (1) is connected to the a interface of the energy storage module (4) via the first circulating water pump (3), and the d interface of the energy storage module (4) is connected to the inlet of the air source heat pump (1); the energy storage module (4) is connected to the inlet of the air source heat pump (1); The b interface of the energy module (4) is connected to the water inlet of the high-temperature screw water-water heat pump (7) via the first energy storage valve (6-1); the water outlet of the high-temperature screw water-water heat pump (7) is connected to the water inlet of the user heating terminal device (9) via the third circulating water pump (8); the water outlet of the user heating terminal device (9) is connected via the return water inlet and return water outlet of the high-temperature screw water-water heat pump (7), the second energy storage valve (6-2), and the c interface of the energy storage module (4); and the d interface of the energy storage module (4) is connected to the inlet of the air source heat pump (1).

2. An energy storage interconnected heat pump system using heat storage materials according to claim 1, characterized in that: The air source heat pump (1) circulates and compresses the refrigerant, uses the air as a heat source, and uses the low-grade heat energy in the air for heating needs of heat users through cyclic heat exchange; the energy storage module stores the excess heat generated by the high-efficiency heating capacity of the air source heat pump at high ambient temperature during the day, and uses it to supplement the insufficient heating capacity of the air source heat pump system at low ambient temperature; the high-temperature screw water-water heat pump can use the heat stored in the energy storage module as a heat source, and further heats the circulating water in the pipeline to the required temperature for heating by compressing, cooling and releasing heat on the refrigerant, thereby reducing the heating pressure of the air source heat pump unit; the circulating water pump is used to maintain the circulation of water in the pipeline system to ensure that hot water can be effectively transported to the required pipeline; the user-end heating equipment provides the heat in the heating pipeline to the heat user through convection heat exchange or radiation heat exchange, and the specific equipment is selected by the heat user such as fan coil units, floor heating pipes or radiators.

3. An energy storage interconnected heat pump system using heat storage materials according to claim 1, characterized in that: The air source heat pump adopts a common scroll compressor.

4. The energy storage interconnected heat pump system using heat storage materials according to claim 1, characterized in that: The energy storage module in the energy storage interconnected heat pump system using heat storage materials is equipped with an ice storage ball encapsulated with an inorganic salt material. This material undergoes phase change at 27°C, and its latent heat is 44.5 kWh / m 3 , while the solid sensible heat and liquid sensible heat are 0.86kWh / ℃ and 1.04kWh / ℃ respectively. When phase change occurs, its solidification rate is 1.6kW / ℃, and its dissolution rate is 2.2kW / ℃. The material toxicity LD50 value is 2.5inmg / kg, which can effectively absorb heat and has good environmental friendliness. It has four interfaces a, b, c, and d. The two interfaces a and d are connected to the air source heat pump, and the interfaces b and c are connected to the high-temperature screw water-water heat pump. When the air source heat pump can provide enough heat, hot water flows in from port a and returns to the air source heat pump from port d. The first energy storage valve and the second energy storage valve are closed to store heat. When the ambient temperature is low, hot water flows in from port a and flows out from port b, then flows through the high-temperature screw water-water heat pump and the user heating terminal equipment in turn, then flows in from port c and flows out through port d back to the air source heat pump, and the stored heat is released for heating.

5. The energy storage interconnected heat pump system using heat storage materials according to claim 1, characterized in that: The high-temperature screw water-water heat pump in the energy storage interconnected heat pump system using heat storage materials can achieve a water temperature of 50°C on the inlet side and 65°C on the outlet side through intelligent control.

6. The energy storage interconnected heat pump system using heat storage materials according to claim 1, characterized in that: The energy storage module and high-temperature screw water-water heat pump are both installed indoors.

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