Cross-seasonal heat storage coupling solar energy-ground source heat pump combined heating system

Abstract

The invention provides a cross-seasonal heat storage coupling solar ground source heat pump combined heating system. The cross-seasonal heat storage coupling solar ground source heat pump combined heating system mainly comprises a solar heat collector, a valve, a heat storage water tank, a heating tail end, a buried phase change heat storage water tank, a buried pipe and a heat pump. Solar radiation heat in non-heating seasons is collected and stored through cross-seasonal heat storage, and the stored heat is extracted in the heating period in winter and is used for heating a building together with a solar ground source heat pump combined heating system. The system has the beneficial effects that the system efficiency is improved, and the use of thermal insulation materials is reduced, so that the cost is reduced; the buried pipe absorbs and inhibits heat diffusion of the heat storage water tank, heat balance of a soil temperature field around the buried phase change heat storage water tank is guaranteed, and efficient operation of a heat pump unit is maintained. The invention has six control methods: solar energy-soil heat storage, solar energy direct heating, solar energy coupling buried phase change heat storage water tank heating, buried phase change heat storage water tank direct heating, solar energy ground source heat pump combined heating and ground source heat pump independent heating.

Description

Technical Field

[0001] The invention relates to the field of heat storage and heating technology, and in particular to a cross-seasonal heat storage coupled solar ground source heat pump combined heating system and heating method that can convert solar energy into thermal energy and store it in summer. Background Art

[0002] The pollution, environmental and ecological problems caused by the growing traditional energy heating are becoming more and more prominent. Therefore, it is imperative to use renewable energy, especially solar energy, geothermal energy and other clean heating. However, renewable energy heating is easily restricted by factors such as weather, region, season, etc., and has strong intermittent, unstable and seasonal characteristics. Interseasonal heat storage stores renewable energy in seasons with abundant heat sources and low heat demand, and releases it in seasons with scarce heat sources and high heat demand.

[0003] The demand for heating in northern my country has a significant seasonal characteristic, that is, in summer, solar energy resources are abundant but often not effectively utilized, while in winter, solar energy resources are scarce and it is difficult to meet people's demand for thermal energy. Therefore, inter-seasonal heat storage has become one of the most effective ways to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a cross-seasonal heat storage coupled solar ground source heat pump combined heating system that is flexible, diverse, has high energy storage density and high system efficiency, while solving the thermal balance of the soil temperature field around the heat exchanger with an annual cycle, ensuring the efficient operation of the heat pump unit, and effectively replenishing heat to the soil.

[0005] The technical solution adopted by the present invention is: the present invention provides a cross-seasonal heat storage coupled solar ground source heat pump combined heating system, including a solar collector, a valve 1, a heat storage tank, a valve 2, a valve 3, a heating terminal, a valve 4, a valve 5, a valve 6, a valve 7, an underground phase change heat storage tank and an underground pipe, a valve 8, a valve 9, a valve 10, a valve 11, a valve 12, a valve 13, a valve 14, a valve 15, and a heat pump; in the non-heating season, the solar radiation heat in the non-heating season is collected and stored in the soil around the underground phase change heat storage tank and the underground pipe through cross-seasonal underground heat storage, and solar energy-soil heat storage is performed at this time; in the heating season, when the solar radiation intensity is sufficient When the temperature is high, the heat absorbed by the solar collector can meet the heating requirements, and solar energy is used directly for heating; when solar energy cannot meet the heating needs, solar energy is coupled with the underground phase-change water storage tank for heating; when it is rainy or at night, the solar radiation intensity is almost zero, and the underground phase-change water storage tank is used for direct heating; in the middle and late heating season, as the heat release of the underground phase-change water storage tank increases, the water supply temperature of the underground phase-change water storage tank decreases and may not be able to meet the heating needs of users. At this time, when solar energy cannot meet the heating needs, the ground source heat pump is started to carry out solar energy and ground source heat pump combined heating; when it is rainy or at night, the solar radiation intensity is almost zero, and the ground source heat pump is used alone for heating.

[0006] The underground phase-change water storage tank and underground pipe comprise an underground phase-change water storage tank and an underground pipe. The underground phase-change water storage tank is cylindrical, the water tank is buried in the middle, and the U-shaped underground pipe is arranged around the water tank.

[0007] The present invention provides a cross-seasonal heat storage coupled solar ground source heat pump combined heating system with six control methods; control method one: when valves 8 and 9 are opened and the other valves are closed, the solar collector provides heat energy to the buried phase change water storage tank and the buried pipe to realize solar energy-soil heat storage.

[0008] Control method 2: When valves 1, 3, 4 and 11 are opened and the other valves are closed, solar energy is used for direct heating.

[0009] Control method three: valve 1, valve 3, valve 4, valve 11, solar energy coupled underground phase change water storage tank heating.

[0010] Control method four: Direct heating with underground phase change water storage tank.

[0011] Control method five: solar energy and ground source heat pump combined heating.

[0012] Control method six: Ground source heat pump for separate heating.

[0013] The present invention provides a cross-seasonal heat storage coupled solar ground source heat pump combined heating system, which has the following beneficial effects: underground pipes arranged around the underground phase change water storage tank heat the soil around the heat storage tank, thereby improving system efficiency, reducing floor space, and reducing or eliminating the use of insulation materials, thereby reducing costs; the underground pipes absorb and inhibit heat diffusion from the water storage tank, thereby ensuring thermal balance of the soil temperature field around the underground phase change water storage tank with an annual cycle, ensuring efficient operation of the heat pump unit, and effectively replenishing heat to the soil, thereby reducing system heat loss, improving solar energy guarantee rate, and providing clean energy for building heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the principle of a cross-seasonal heat storage coupled solar ground source heat pump combined heating system described in the present invention.

[0015] Figure 2 It is a schematic diagram of the underground phase change water storage tank and underground pipe structure of a cross-seasonal heat storage coupled solar ground source heat pump combined heating system described in the present invention.

Claims

1. A cross-seasonal heat storage coupled solar ground source heat pump combined heating system, comprising a solar collector (1), a valve 1 (2), a heat storage tank (3), a valve 2 (4), a valve 3 (4), a heating terminal (5), a valve 4 (6), a valve 5 (7), a valve 6 (8), a valve 7 (9), an underground phase change heat storage tank and an underground pipe (10), a valve 8 (11), a valve 9 (12), a valve 10 (13), a valve 11 (14), a valve 12 (15), a valve 13 (16), a valve 14 (17), a valve 15 (18), and a heat pump (19); in the non-heating season, the solar radiation heat in the non-heating season is collected and stored in the soil around the underground phase change heat storage tank and the underground pipe (10) through cross-seasonal underground heat storage. When the solar energy is high enough, the heat absorbed by the solar collector (1) can meet the heating requirements, and the solar energy is directly heated; when the solar energy cannot meet the heating requirements, the solar energy is coupled with the underground phase-change water storage tank for heating; when it is rainy or at night, the solar energy radiation intensity is almost zero, and the underground phase-change water storage tank is directly heated; in the middle and late stages of the heating season, as the heat released by the underground phase-change water storage tank increases, the water supply temperature of the underground phase-change water storage tank decreases, and it may not be able to meet the heating needs of the user. At this time, when the solar energy cannot meet the heating needs, the ground source heat pump is started to carry out solar ground source heat pump combined heating; when it is rainy or at night, the solar energy radiation intensity is almost zero, and the ground source heat pump is used for heating alone. The underground phase-change water storage tank and the underground pipe include an underground phase-change water storage tank and an underground pipe, the underground phase-change water storage tank is cylindrical, the water tank is buried in the middle, and the U-shaped underground pipe is arranged around the water tank.

2. A control method using a cross-seasonal heat storage coupled solar ground source heat pump combined heating system as claimed in claim 1, comprising the following control method, characterized in that: A. Control method 1: When valve 8 (11) and valve 9 (12) are opened and the other valves are closed, the solar collector (1) provides heat energy to the underground phase change water storage tank and the underground pipe (10), thereby realizing solar energy-soil heat storage. 3.B. Control method 2: When valve 1 (2), valve 3 (4), valve 4 (6), and valve 11 (14) are opened and the remaining valves are closed, solar energy is used for direct heating. 4.C. Control method three: valve 1 (2), valve 3 (4), valve 4 (6), valve 11 (14), solar energy coupled underground phase change water storage tank heating. 5.D. Control method 4: Direct heating using underground phase-change water storage tank. 6.E. Control method five: solar energy and ground source heat pump combined heating. 7.F. Control method six: Ground source heat pump for separate heating.

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