Circulating system for improving utilization rate of stored energy and discharged energy

Abstract

The invention discloses a circulating system for improving the energy storage and release utilization rate. The circulating system comprises refrigerating and heating equipment and an energy storage and release assembly. The energy storage and release assembly comprises an energy storage water tank, the energy storage water tank achieves high-low water level circulating flow water storage through position arrangement of an overflow weir, a water inlet pipe set and a water outlet pipe set, the refrigerating and heating equipment works in the low valley time period, and the electric power cost is effectively saved. A flowing water source in the energy storage water tank can integrally reach a set temperature, the concept of full storage and complete discharge is fully embodied, and the energy storage and discharge utilization rate is close to or even reaches 100%.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage and release, and particularly to a circulation system for improving the utilization rate of energy storage and release. Background Art

[0002] Cool storage and heat storage store cold and heat first through certain technical means, and release the stored cold and heat through the circulation of the system for reuse when needed. An air-conditioning system with the function of cool storage and heat storage can make full use of the low-cost electricity of the peak-valley electricity price policy, greatly reduce the operation cost of the air-conditioning system, and at the same time, the system can also avoid using electricity during peak shortage periods, realize the peak shaving and valley filling of the power grid, and avoid "power cuts" during peak periods. At present, the main heat storage method in China is to use an electric boiler for heat storage, that is, taking the electric boiler as the heat source, heating water with low-cost electricity during off-peak periods, and storing it in a hot water storage tank. During peak periods of the power grid, the electric boiler is turned off, and the hot water stored in the hot water storage tank is used for heating. The integration of heat storage and cool storage is not considered; and this heating method cannot achieve that the overall water source reaches the set temperature, and only the water source at the outlet can reach the set temperature, which cannot achieve the required energy storage effect.

[0003] On the above basis, existing central air conditioners in buildings generally use the method of direct evaporation refrigeration by a compressor to cool the air, or the method of direct heating to heat the air; this method has high energy consumption and cannot avoid the cost consumption during high electricity valley periods.

[0004] Therefore, there is an urgent need to design a circulation system for improving the utilization rate of energy storage and release. Summary of the Invention

[0005] The purpose of the present invention is to provide a circulation system for improving the utilization rate of energy storage and release to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above purpose, the present invention provides the following solution: The present invention provides a circulation system for improving the utilization rate of energy storage and release, including:

[0007] A refrigeration and heating device, which is used to heat or cool the circulating water;

[0008] An energy storage and release component, which is used to realize the energy storage cycle with the refrigeration and heating device and supply energy to users through a heat exchanger;

[0009] The energy storage and release component includes an energy storage water tank, and a water inlet pipe group and a water outlet pipe group are respectively installed on two opposite sides of the energy storage water tank; the water inlet pipe group is respectively communicated with the water outlet end of the refrigeration and heating equipment and the water outlet end of the heat exchanger through valves; the water outlet pipe group includes an upper water outlet pipe and a lower water outlet pipe; an overflow weir is arranged between the upper water outlet pipe and the lower water outlet pipe, and a gap is reserved between the top end of the overflow weir and the top end of the energy storage water tank; both the upper water outlet pipe and the lower water outlet pipe are respectively communicated with the water inlet end of the refrigeration and heating equipment and the water inlet end of the heat exchanger; both the water inlet pipe group and the lower water outlet pipe are arranged at the bottom of the energy storage water tank.

[0010] Preferably, a heat storage system is formed between the refrigeration and heating equipment and the energy storage and release component; the heat storage system heats the circulating water through the refrigeration and heating equipment, and the circulating water enters the energy storage water tank through the water inlet pipe group and returns to the refrigeration and heating equipment through the lower water outlet pipe for heating until the water source temperature in the energy storage water tank reaches the design temperature.

[0011] A heat release system is formed between the energy storage and release component and the heat exchanger. The heat release system transports the water source with the design temperature in the energy storage water tank to the heat exchanger through the upper water outlet pipe for heat exchange; the heat exchanger supplies energy to the user with the water reaching the design temperature through heat exchange, and then transports the heat-exchanged water source back to the energy storage water tank through the water inlet pipe group until the water source in the energy storage water tank no longer reaches the design temperature.

[0012] Preferably, after the height of the circulating water in the water tank is higher than the overflow weir, it enters the area enclosed by the overflow weir and the inner wall of the energy storage water tank, and then is discharged from the energy storage water tank through the upper water outlet pipe.

[0013] Preferably, a cold storage system is formed between the refrigeration and heating equipment and the energy storage and release component; the cold storage system cools the circulating water through the refrigeration and heating equipment, and the circulating water enters the energy storage water tank through the water inlet pipe group and returns to the refrigeration and heating equipment through the upper water outlet pipe for cooling until the water source temperature in the energy storage water tank reaches the design temperature.

[0014] A cold release system is formed between the energy storage and release component and the heat exchanger. The cold release system transports the water source with the design temperature in the energy storage water tank to the heat exchanger through the lower water outlet pipe for heat exchange; the heat exchanger supplies energy to the user with the water reaching the design temperature through heat exchange, and then transports the heat-exchanged water source back to the energy storage water tank through the water inlet pipe group until the water source in the energy storage water tank no longer reaches the design temperature.

[0015] The present invention discloses the following technical effects: The present invention can improve the energy storage utilization rate through the energy storage and release component, and the refrigeration and heating equipment operates during the low - electricity valley period, effectively saving the electricity cost; moreover, the present invention can make the flowing water source in the box reach the set temperature as a whole, fully embodying the concept of storing full and discharging completely, and bringing the energy storage and release utilization rate close to or even reaching 100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the circulation system of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the energy storage and release component of the present invention;

[0019] Among them, 1, refrigeration and heating equipment; 2, energy storage and release component; 3, heat exchanger; 4, user; 5, constant pressure make - up water device; 21, upper water outlet pipe; 22, lower water outlet pipe; 23, overflow weir. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0021] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0022] The present invention provides a circulation system for improving the energy storage and release utilization rate, including:

[0023] A refrigeration and heating equipment 1, which is used to heat or cool the circulating water;

[0024] An energy storage and release component 2, which is used to realize the energy storage cycle with the refrigeration and heating equipment 1 and supply energy to the user 4 through the heat exchanger 3;

[0025] The energy storage and release component 2 includes an energy storage water tank, and a water inlet pipe group and a water outlet pipe group are respectively installed on two opposite sides of the energy storage water tank; the water inlet pipe group is respectively communicated with the water outlet end of the refrigeration and heating device 1 and the water outlet end of the heat exchanger 3 through valves; the water outlet pipe group includes an upper water outlet pipe 21 and a lower water outlet pipe 22; an overflow weir 23 is arranged between the upper water outlet pipe 21 and the lower water outlet pipe 22, and a gap is reserved between the top end of the overflow weir 23 and the top end of the energy storage water tank; both the upper water outlet pipe 21 and the lower water outlet pipe 22 are respectively communicated with the water inlet end of the refrigeration and heating device 1 and the water inlet end of the heat exchanger 3; both the water inlet pipe group and the lower water outlet pipe 22 are arranged at the bottom of the energy storage water tank.

[0026] Preferably, a heat storage system is formed between the refrigeration and heating device 1 and the energy storage and release component 2; the heat storage system heats the circulating water through the refrigeration and heating device 1, and the circulating water enters the energy storage water tank through the water inlet pipe group and returns to the refrigeration and heating device 1 through the lower water outlet pipe 22 for heating until the water source temperature in the energy storage water tank reaches the design temperature.

[0027] In an embodiment of the present invention, the design temperature of the heat storage system is set to 50 - 52 °C.

[0028] A heat release system is formed between the energy storage and release component 2 and the heat exchanger 3. The heat release system transports the water source in the energy storage water tank that reaches the design temperature to the heat exchanger 3 through the upper water outlet pipe 21 for heat exchange; the heat exchanger 3 supplies energy to the user 4 by heat exchange of the water that reaches the design temperature and then transports the heat-exchanged water source back to the energy storage water tank through the water inlet pipe group until the water source in the energy storage water tank no longer reaches the design temperature.

[0029] Preferably, after the height of the circulating water in the water tank is higher than the overflow weir 23, it enters the area enclosed by the overflow weir 23 and the inner wall of the energy storage water tank and is discharged from the energy storage water tank through the upper water outlet pipe 21.

[0030] Preferably, a cold storage system is formed between the refrigeration and heating device 1 and the energy storage and release component 2; the cold storage system reduces the temperature of the circulating water through the refrigeration and heating device 1, and the circulating water enters the energy storage water tank through the water inlet pipe group and returns to the refrigeration and heating device 1 through the upper water outlet pipe 21 for refrigeration until the water source temperature in the energy storage water tank reaches the design temperature.

[0031] In an embodiment of the present invention, the design temperature of the cold storage system is set to 0 °C.

[0032] A cold release system is formed between the energy storage and release component 2 and the heat exchanger 3. The cold release system transports the water source in the energy storage water tank that reaches the design temperature to the heat exchanger 3 through the lower water outlet pipe 22 for heat exchange; the heat exchanger 3 supplies energy to the user 4 by heat exchange of the water that reaches the design temperature and then transports the heat-exchanged water source back to the energy storage water tank through the water inlet pipe group until the water source in the energy storage water tank no longer reaches the design temperature.

[0033] In an embodiment of the present invention, there is always circulating water in the energy storage water tank, and the energy storage and discharge water tank preferentially stores energy during the period of low electricity and water consumption at night. In actual operation, through the parallel connection of multiple energy storage and discharge water tanks, the heat storage and cold storage during the day in a certain area can be realized, and the practicability is extremely strong.

[0034] Furthermore, the energy storage cycle of the energy storage water tank is 5 - 8 hours, basically realizing energy storage at night and being directly used normally during the day.

[0035] Furthermore, when the energy storage water tank is short of water, make-up circulating water is supplied to the energy storage water tank from the water supply reservoir.

[0036] In an embodiment of the present invention, the heat exchanger 3 is preferably a plate heat exchanger.

[0037] In an embodiment of the present invention, the refrigeration and heating equipment includes but is not limited to air-conditioning units, gas boilers, electric boilers, and air-source heat pumps.

[0038] In an embodiment of the present invention, as Figure 2 shown, the height of the water tank is 4500 mm, where the installation height of the water inlet pipe group and the lower outlet pipe 22 is 500 mm from the ground of the water tank; the bottom end of the overflow weir 23 is 2700 m from the top surface of the water tank; the upper outlet pipe 21 is 1200 mm from the bottom end of the overflow weir 23.

[0039] Furthermore, a temperature measuring device is provided at the top of the energy storage water tank to judge the temperature of the top layer of water in the water tank. And in the present invention, a make-up water pipe is also connected to the top of the water tank.

[0040] In an embodiment of the present invention, a constant pressure make-up device 5 is also connected to the user 4 end to ensure the stability of the system pressure.

[0041] In an embodiment of the present invention, as Figure 1 shown, the refrigeration and heating equipment 1 can directly supply cooling or heating to the user. At this time, open the valve passages of F1 and F2 and directly supply to the user.

[0042] In an embodiment of the present invention, when summer cold storage or winter heat storage is required, open the valve passages of F3 and F4, and circulate the circulating water between the refrigeration and heating equipment 1 and the energy storage water tank; the continuous transportation of the circulating water is realized through the pump group.

[0043] In an embodiment of the present invention, when summer cold release or winter heat release is required, open the valve passages of F5, F6, F7, and F8, and circulate the circulating water between the heat exchanger 3 and the energy storage water tank, thereby realizing the energy supply and heat exchange between the heat exchanger 3 and the user; the continuous transportation of the circulating water is realized through the pump group.

[0044] Furthermore, when storing cold in summer or heat in winter, to ensure that the water source in the entire energy storage water tank reaches the designed temperature, it is necessary to continuously cool or heat the circulating water that has not reached the temperature through the refrigeration and heating equipment. According to the second law of thermodynamics, hot water will float on the top in the water tank, while cold water will sink to the bottom;

[0045] Heat can only be transferred unidirectionally from a high-temperature object to a low-temperature object, and cannot spontaneously transfer from a low-temperature object to a high-temperature object; however, the water in the water tank is always in a flowing state. To ensure that the water tank can be filled, when hot water is needed, the water with a lower temperature at the bottom is continuously heated until the water flowing out of the lower outlet pipe 22 can reach the designed temperature, which can ensure that the water source in the energy storage water tank reaches the designed temperature; when cold water is needed, the water with a higher temperature at the top is continuously cooled until the water flowing out of the upper outlet pipe 21 can reach the designed temperature, which can ensure that the water source in the energy storage water tank reaches the designed temperature.

[0046] Furthermore, in the energy release stage, when it is necessary to release cold in summer or heat in winter, to ensure that all the water source in the entire energy storage water tank that has reached the designed temperature can be released, the lower outlet pipe 22 or the upper outlet pipe 21 of the water tank is opened to release cold or heat; for example, during the cold release process, there is always circulating water in the water tank during the cold release process, but the water at the bottom of the water tank is always the water source with the lowest temperature. When the water source at the bottom of the water tank cannot reach the designed temperature, it means that the stored energy in the water tank has been completely released; similarly, during the heat release process, the water at the top of the water tank is always the water source with the highest temperature. If the water flowing into the upper outlet pipe 21 after overflowing through the overflow weir 23 cannot reach the designed temperature, it means that the stored energy in the water tank has been completely released.

[0047] The water that has reached the designed temperature is heat-exchanged with the user's water through a heat exchanger to adjust the temperature inside the user. After the water that has reached the designed temperature supplies energy through heat exchange to the user, its temperature cannot reach the designed temperature; and then it will circulate back to the water tank until the energy of the water source in the water tank that has reached the designed temperature is completely released.

[0048] Furthermore, the present invention can improve the energy storage utilization rate, and the refrigeration and heating equipment 1 works during the low electricity valley period, effectively saving the electricity cost; and the present invention can fully embody the concept of filling and completely releasing the energy storage of the water tank, making the energy storage and release utilization rate close to or even reach 100%.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the spirit of the present invention's design, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A circulation system for improving the utilization rate of storage and release energy, characterized in that: include: A refrigeration and heating device (1), wherein the refrigeration and heating device (1) is used to heat or cool circulating water; The energy storage and release component (2) is used to realize energy storage circulation with the refrigeration and heating equipment (1) and to supply energy to the user (4) through the heat exchanger (3); The energy storage and discharge assembly (2) comprises an energy storage water tank, and a water inlet pipe group and a water outlet pipe group are respectively installed on two opposite sides of the energy storage water tank; the water inlet pipe group is connected to the water outlet end of the cooling and heating equipment (1) and the water outlet end of the heat exchanger (3) through a valve; the water outlet pipe group comprises an upper water outlet pipe (21) and a lower water outlet pipe (22); an overflow weir (23) is arranged between the upper water outlet pipe (21) and the lower water outlet pipe (22), and a gap is reserved between the top of the overflow weir (23) and the top of the energy storage water tank; the upper water outlet pipe (21) and the lower water outlet pipe (22) are respectively connected to the water inlet end of the cooling and heating equipment (1) and the water inlet end of the heat exchanger (3); the water inlet pipe group and the lower water outlet pipe (22) are both arranged at the bottom of the energy storage water tank.

2. A circulation system for improving storage and release energy utilization rate according to claim 1, characterized in that: A heat storage system is formed between the refrigeration and heating equipment (1) and the energy storage and release assembly (2); the heat storage system heats circulating water through the refrigeration and heating equipment (1); the circulating water enters the energy storage water tank through the water inlet pipe group and flows back to the refrigeration and heating equipment (1) through the lower water outlet pipe (22) for heating until the water source temperature in the energy storage water tank reaches the design temperature.

3. A circulation system for improving storage and release energy utilization rate according to claim 2, characterized in that: A heat release system is formed between the energy storage and release assembly (2) and the heat exchanger (3), wherein the heat release system transports the water source in the energy storage water tank that has reached the design temperature to the heat exchanger (3) for heat exchange through the upper water outlet pipe (21); the heat exchanger (3) supplies the water that has reached the design temperature to the user (4) through heat exchange, and then transports the water source after heat exchange back to the energy storage water tank through the water inlet pipe group until the water source in the energy storage water tank does not reach the design temperature.

4. A circulation system for improving storage and release energy utilization rate according to claim 3, characterized in that: After the circulating water in the water tank reaches a height higher than the overflow weir (23), it enters the area enclosed by the overflow weir (23) and the inner wall of the energy storage water tank and is discharged from the energy storage water tank through the upper outlet pipe (21).

5. A circulation system for improving storage and release energy utilization rate according to claim 1, characterized in that: A cold storage system is formed between the cooling and heating equipment (1) and the energy storage and release assembly (2); the cold storage system lowers the temperature of circulating water through the cooling and heating equipment (1); the circulating water enters the energy storage water tank through the water inlet pipe group and flows back to the cooling and heating equipment (1) through the upper water outlet pipe (21) for cooling until the water source temperature in the energy storage water tank reaches the design temperature.

6. A circulation system for improving storage and release energy utilization rate according to claim 5, characterized in that: A cooling system is formed between the energy storage and discharge assembly (2) and the heat exchanger (3), wherein the cooling system transports the water in the energy storage water tank that has reached the design temperature to the heat exchanger (3) for heat exchange through the lower water outlet pipe (22); the heat exchanger (3) exchanges heat with the water that has reached the design temperature to supply energy to the user (4) through heat exchange, and then transports the water after heat exchange back to the energy storage water tank through the water inlet pipe group until the water in the energy storage water tank does not reach the design temperature.

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