CN107228506A - A kind of resource integrated complementation of renewable energy based on cross-season heat-storage utilizes system - Google Patents

Abstract

The invention relates to an integrated and complementary utilization system of renewable energy based on cross-season heat storage. The system includes: a flat-plate solar collector: used to collect solar energy throughout the year and provide heat energy; vertical U-shaped cluster underground pipes: connected with Flat-plate solar collectors are connected to store abundant solar energy in spring and summer for heating in winter; water circulation subsystem: respectively connected to flat-plate solar collectors and vertical U-shaped cluster underground pipes for water heating and Water cycle; user demand terminal: connected to the water cycle subsystem, including the connection device for bathing and indoor heat exchange device; control subsystem: an integrated control cabinet, which controls the different working modes of the system through the on-off of the valve on the pipeline in the control system switch. Compared with the prior art, the invention has the advantages of energy complementarity, heat transfer and utilization across seasons, low investment, easy popularization, mass production and the like.

Description

An Integrated Complementary Utilization System of Renewable Energy Based on Interseasonal Heat Storage

technical field

The invention relates to the fields of new energy, heat supply and new rural construction, in particular to an integrated and complementary utilization system of renewable energy based on cross-season heat storage.

Background technique

Common energy supply methods in rural areas include straw incineration, electric heating, coal combustion, etc., which not only consume a large amount of primary energy, but also emit large amounts of greenhouse gases, seriously pollute the environment, and have low energy efficiency. A more reliable solution is to promote the use of renewable energy in rural areas. However, for a long time, my country's decentralized farm life energy supply group has a low proportion of renewable energy, an unreasonable energy structure, and a high degree of dependence on fossil energy and external commercial energy. The reason is the lack of effective stable supply technology and complete sets of clean energy for small households in rural areas.

At present, the most common way to use renewable energy in rural areas is to install solar water heaters, etc., and its disadvantages are obvious. The main performance is that the rich solar energy in spring, summer and autumn cannot be effectively utilized, and there are many rainy days in winter, and the low solar irradiance reduces its reliability. At the same time, it cannot meet the needs of heating in winter. An effective solution is to use a variety of energy sources for complementary utilization, but current research is mostly focused on solar-assisted ground-source heat pump technology, and its initial investment is relatively high. In addition, its application range is mainly aimed at severe cold regions, which has certain limitations.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide an integrated complementary utilization of renewable energy based on cross-season heat storage, which is energy complementary, heat transfer and utilization across seasons, low investment, easy to popularize, and mass-produced system.

The purpose of the present invention can be achieved through the following technical solutions:

An integrated and complementary utilization system of renewable energy based on cross-season heat storage, the system includes:

Flat-plate solar collector: used to collect solar energy and provide thermal energy throughout the year;

Vertical U-shaped cluster underground pipes: connected with flat-plate solar collectors to store abundant solar energy in spring and summer for heating in winter;

Water circulation subsystem: respectively connected with flat-plate solar collectors and vertical U-shaped cluster buried pipes for water heating and water circulation;

User demand end: connected to the water circulation subsystem, including bathing connection devices and indoor heat exchange devices;

Control subsystem: It is an integrated control cabinet, which switches the different working modes of the system by switching on and off the valves on the pipeline in the control system.

The water circulation subsystem includes a domestic hot water tank and a heating water tank, the domestic hot water tank is respectively connected with a flat-plate solar collector, a vertical U-shaped cluster underground pipe and a connecting device for bathing, and the heating water tank They are respectively connected with flat-plate solar heat collectors, vertical U-shaped cluster underground pipes and indoor heat exchange devices.

The valves include a first electric three-way valve, a second electric three-way valve, a third electric three-way valve and a fourth electric three-way valve respectively connected to the integrated control cabinet. The first electric three-way valve The water inlet side is connected with the outlet end of the flat-plate solar collector, the 1# outlet side is connected with the domestic hot water tank, and the 2# outlet side is connected with the 1# outlet side of the second electric three-way valve. The 2# water outlet side and the water inlet side of the three-way valve are connected with the heating water tank respectively, and the water inlet side is also connected with the 1# water outlet side of the third electric three-way valve, and the 2# water outlet side of the electric three-way valve is connected with the vertical The U-shaped cluster underground pipe is connected, and the water inlet side is connected with the water inlet side of the fourth electric three-way valve, and the 1# water outlet side of the fourth electric three-way valve is connected with the inlet end of the flat-plate solar collector, The water outlet side of 2# communicates with the outlet end of the flat-plate solar collector.

The pipeline between the heating water tank and the indoor heat exchange device is sequentially provided with a second circulating water pump, a first check valve and a second regulating valve respectively connected to the integrated control cabinet. The pipeline between the connecting devices is provided with a first regulating valve connected to the integrated control cabinet, and the pipeline between the second electric three-way valve and the third electric three-way valve is respectively provided with the integrated control cabinet respectively. Connected first circulating water pump and second check valve.

The flat-plate solar heat collector and its inlet and outlet ports, between the third electric three-way valve and the fourth electric three-way valve, between the third electric three-way valve and the second check valve, vertical U There are temperature probes connected to the integrated control cabinet on the buried pipe of the type cluster, in the domestic hot water tank, and in the heating water tank.

The domestic hot water tank is provided with electric heating rods and copper heat exchange coils arranged in a spiral manner.

The distance between the heat exchange coil and the inner wall of the domestic hot water tank is 2-5cm, the distance between the coils is 0.5-1.0cm, the power of the electric heating rod is 3kw, and the buried depth of the vertical U-shaped cluster underground pipes is 10-15 meters.

The different working modes include a year-round domestic hot water priority supply mode, a cross-seasonal soil thermal storage mode, a winter solar direct heating mode, a winter soil heating mode, and a winter freezing night antifreeze mode.

When in the year-round domestic hot water priority supply mode, the first circulating water pump is on, and the first electric three-way valve, the second electric three-way valve, the third electric three-way valve and the fourth electric three-way valve are all switched to The water inlet side is connected to the 1# outlet water side. At this time, the heat collected by the flat-plate solar collector heats the domestic hot water tank through the circulation circuit to provide domestic hot water;

When in the cross-season soil heat storage mode, the first circulating water pump is in the open state, and the first electric three-way valve, the second electric three-way valve and the fourth electric three-way valve are all switched to the water inlet side and the 1# outlet side. The third electric three-way valve is switched to conduction between the water inlet side and the 2# outlet water side. At this time, the flat-plate solar collector and the vertical U-shaped cluster buried pipe jointly provide heat for the domestic hot water tank;

When it is in the winter solar direct heating mode, the first circulating water pump is on, the second electric three-way valve and the fourth electric three-way valve are switched to the water inlet side and the 1# outlet water side, and the first electric three-way valve and the third electric three-way valve are switched to connect the water inlet side and the 2# outlet water side. At this time, the flat-plate solar collector transfers abundant solar energy in spring, summer and autumn to the vertical U-shaped cluster buried pipe to heat the soil temperature for winter use;

When in winter soil heat extraction mode, both the third electric three-way valve and the fourth electric three-way valve are switched to connect the water inlet side with the 1# outlet water side, and the first electric three-way valve and the second electric three-way valve are both connected. Switch to the conduction between the water inlet side and the 2# outlet water side, the first circulating water pump and the second circulating water pump are in the open state, and the regulating valve is in the open state. At this time, the flat-plate solar collector heats the heating water tank for user needs side use;

When it is in the anti-freezing mode in winter and night, the fourth electric three-way valve is switched to conduction between the water inlet side and the 1# outlet water side, and the first electric three-way valve, the second electric three-way valve and the third electric three-way valve are all switched To connect the water inlet side with the 2# outlet water side, the first circulating water pump is in the open state. At this time, the heat stored in the vertical U-shaped cluster buried pipes in spring, summer and autumn is released to heat the heating water tank.

Compared with the prior art, the present invention has the following advantages:

1. Complementary energy sources: using solar energy and geothermal energy for complementary utilization, compared with traditional energy utilization methods in rural areas, it is more low-carbon and environmentally friendly, and effectively overcomes the limitations of a single renewable energy source, and the energy supply is more reliable .

2. Transfer and utilization of heat across seasons: the present invention adopts vertical U-shaped cluster underground pipes to realize cross-season transfer and utilization of heat, and stores abundant solar energy collected in spring, summer and autumn into the cluster underground pipes, alleviating the Insufficient demand for basic heating and domestic hot water in winter.

3. Low investment and easy promotion: This system saves the investment of ground source heat pump units, and the drilling depth of vertical U-shaped cluster buried pipes is 10-15m, which is far lower than the 70-80m of conventional ground source heat pump buried pipes. Drilling depth, low initial investment, conducive to promotion.

4. Mass production: In addition to the renewable energy collection side, that is, flat-plate solar collectors and vertical U-shaped cluster buried pipes, and the end of user demand, that is, bathing connection devices and indoor heat exchange devices, The remaining components of the system are integrated and integrated, which is conducive to mass production and use.

Description of drawings

Fig. 1 is the schematic diagram of the principle of the system of the present invention;

Fig. 2 is a schematic diagram of electric three-way valve reversing;

Figure 3 is a schematic diagram of system operation under the priority supply mode of domestic hot water throughout the year;

Figure 4 is a schematic diagram of system operation in winter domestic hot water auxiliary supply mode;

Figure 5 is a schematic diagram of system operation in the cross-seasonal soil heat storage mode;

Figure 6 is a schematic diagram of system operation in winter solar direct heating mode;

Figure 7 is a schematic diagram of system operation in winter soil heating mode;

In Fig. 3-Fig. 7, the thick lines all represent the route of the water circulation and heat exchange pipes;

In the figure, 1. flat-plate solar heat collector, 2. vertical U-shaped cluster buried pipe, 3. integrated control cabinet, 4. domestic hot water tank, 5. user demand terminal, 51. connecting device for bathing, 52. Indoor heat exchange device, 6. Heating water tank, 71. The first electric three-way valve, 72. The second electric three-way valve, 73. The third electric three-way valve, 74. The fourth electric three-way valve, 81. The first Circulating water pump, 82, second circulating water pump, 92-98, temperature probe, 101, first regulating valve, 102, second regulating valve, 103, first check valve, 104, second check valve.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, an integrated and complementary utilization system of renewable energy based on inter-seasonal heat storage includes a flat-plate solar collector 1 that provides domestic hot water and heat required for heating, and a vertical U-shaped heat transfer system that transfers heat across seasons. The cluster buried pipe 2 receives the domestic hot water tank 4 and the heating water tank 6 that receive the heat energy collected or stored by the flat solar collector 1 and the vertical U-shaped cluster buried pipe 2, and utilizes the domestic hot water tank 4 and the heating water tank 5 The stored heat meets the user demand end 5 of the user demand. The user demand terminal 5 includes a bathing connector 51 and an indoor heat exchange terminal 52 .

Among them, a first electric three-way valve 71 is provided between the outlet end 12 of the flat-plate solar collector and the domestic hot water tank 4, and a connection between the inlet end 11 of the flat-plate solar collector and the outlet end 22 of the vertical U-shaped cluster buried pipe is provided. A fourth electric three-way valve 74 is arranged between them, and a third electric three-way valve 73, a second check valve 104 and a first circulating water pump 81 are sequentially arranged between the inlet port 21 of the vertical U-shaped cluster buried pipe and the heating water tank 6 , A second electric three-way valve 72 is arranged between the heating water tank 6 and the domestic hot water tank 4 . The domestic hot water tank 4 is provided with a heat exchange coil 42, which is made of copper pipe and arranged in a spiral manner. The distance between the coil and the barrel wall is 2-5 cm, and the distance between the coils is 0.5-1.0 cm. The top of the water tank is equipped with an electric heating rod 41 as an auxiliary heating measure, and its power is 3kw, and it is stacked on the heating water tank 6 . A second circulating water pump 82 , a first check valve 103 and a regulating valve 102 are sequentially arranged between the heating water tank 6 and the indoor heat exchange device 52 . The temperature probes 91-98 are sequentially arranged on each pipeline or inside the water tank to detect the water temperature everywhere and feed back to the integrated control box 3 to make corresponding control responses.

When in use, temperature probes 91-98, first circulating water pump 81, second circulating water pump 82, first electric three-way valve 71, second electric three-way valve 72, third electric three-way valve 73, fourth electric three-way valve The valve 74 is connected to the integrated control cabinet 3 through a three-core wire, and each temperature probe feeds back the water temperature to the integrated control cabinet 3, and the integrated control cabinet 3 controls the start and stop of the water pump and the steering of each electric three-way valve to achieve different run mode.

The system includes 5 system working modes, including:

The year-round domestic hot water priority supply mode firstly meets the demand for domestic hot water throughout the year, which means that the solar domestic hot water heating mode has the highest priority. The solar energy collected by the flat-plate solar heat collector 1 throughout the year will pass through the first circulating water pump 81 to heat the domestic hot water tank 4

Auxiliary supply mode of domestic hot water in winter, after satisfying the domestic hot water demand, the rich heat collected by the flat-plate solar collector 1 is introduced into the vertical cluster U-shaped buried pipe 2 through the first circulating water pump 81, and exchanges heat with the soil Increase soil temperature for winter use.

In the cross-season soil heat storage mode, when the sun is strong in winter, the heat collected by the flat-plate solar collector 1 is transferred to the heating water tank 6 through the first circulating water pump 81 for heating.

In the winter solar direct heating mode, when there is no sunshine or the sunshine is lower than the limit value in winter, the heat stored in the soil in spring, summer and autumn is taken out by the first circulating water pump 81 to heat the heating water tank 6 .

In winter soil heating mode, when the winter temperature is lower than 0°C, the first circulating water pump 81 is turned on to extract the abundant heat from the domestic hot water tank 4 to protect the flat-plate solar collector 1 and its pipelines from freezing.

As shown in Figure 3, when the domestic hot water is in the priority supply mode throughout the year, the first circulating water pump 81 is turned on through the integrated control cabinet 3, the first electric three-way valve 71, the second electric three-way valve 72, the third electric three-way valve Both the electric three-way valve 73 and the fourth electric three-way valve 74 are switched to the water outlet side of #1. At this time, the heat collected by the flat-plate solar heat collector 1 heats the domestic hot water tank 4 through a circulation circuit to provide domestic hot water.

As shown in Figure 4, when in the auxiliary supply mode of domestic hot water in winter, the first circulating water pump 81 is turned on through the integrated control cabinet 3, the first electric three-way valve 71, the second electric three-way valve 72, the fourth electric three-way valve The three-way valves 74 are all switched to the #1 water outlet side, and the third electric three-way valve 73 is switched to the #2 water outlet side. At this time, the flat-plate solar heat collector 1 and the vertical U-shaped cluster buried pipe 2 jointly provide heat for the domestic hot water tank 4 . Among them, the heat provided by the vertical U-shaped cluster underground pipes is the rich solar energy collected in spring, summer and autumn.

As shown in Figure 5, when in the cross-season soil heat storage mode, through the integrated control cabinet 3, the first circulating water pump 81 is in the open state, and the second electric three-way valve 72 and the fourth electric three-way valve 74 are switched to #1 water outlet side, the first electric three-way valve 71 and the third electric three-way valve 73 are switched to #2 outlet side. At this time, the flat-plate solar heat collector 1 transfers abundant solar energy in spring, summer and autumn to the vertical U-shaped cluster buried pipe 2 through the circulation loop, and heats the soil temperature for use in winter.

As shown in Figure 6, when in the direct heating mode of solar energy in winter, through the integrated control cabinet 3, the third electric three-way valve 73 and the fourth electric three-way valve 74 are switched to the water outlet side of #1, the first electric three-way valve 71, The second electric three-way valve 72 is switched to the water outlet side of #2, the first circulating water pump 81 and the second circulating water pump 82 are in the open state, and the regulating valve 102 is in the open state. At this time, the flat-plate solar heat collector 1 heats the heating water tank for use by the user demand side 5 .

As shown in Figure 7, when in the soil heat extraction mode in winter, through the integrated control cabinet 3, the fourth electric three-way valve 74 is switched to the water outlet side of #1, the first electric three-way valve 71, the second electric three-way valve 72, The third electric three-way valve 73 is switched to the water outlet side of #2, and the first circulating water pump 81 is turned on. At this time, the heat stored in the vertical U-shaped cluster underground pipes 2 in spring, summer and autumn is released, and the heating water tank 6 is heated through the circulation loop.

Claims (9)

1. a kind of resource integrated complementation of renewable energy based on cross-season heat-storage utilizes system, it is characterised in that the system includes：

Flat type solar heat collector (1)：To collect annual solar energy and provide heat energy；

Vertical U-type cluster underground pipe (2)：It is connected with flat type solar heat collector (1), the sun to store spring and summer affluence It can be used to Winter heat supply；

Water circulation subsystem：It is connected respectively with flat type solar heat collector (1) and Vertical U-type cluster underground pipe (2), to enter Water-filling heating and water circulation；

User's request end：It is connected with water circulation subsystem, including bathing attachment means (51) and indoor heat-exchanger rig (52)；

Control subsystem：For an integrated switch board (3), pass through the different works of the break-make of valve on pipeline in control system to system Operation mode is switched over.

2. the resource integrated complementation of a kind of renewable energy based on cross-season heat-storage according to claim 1 utilizes system, its It is characterised by, described water circulation subsystem includes domestic hot-water's water tank (4) and heating water tank (6), described domestic hot-water's water Case (4) is connected with flat type solar heat collector (1), Vertical U-type cluster underground pipe (2) and bathing with attachment means (51) respectively Connect, described heating water tank (6) is changed with flat type solar heat collector (1), Vertical U-type cluster underground pipe (2) and interior respectively Thermal (52) is connected.

3. the resource integrated complementation of a kind of renewable energy based on cross-season heat-storage according to claim 2 utilizes system, its It is characterised by, the first electric T-shaped valve (71) that described valve includes being connected with integrated switch board (3) respectively, second electronic three Port valve (72), the 3rd electric T-shaped valve (73) and the 4th electric T-shaped valve (74), described the first electric T-shaped valve (71) are entered Water side is connected with the port of export (12) of flat type solar heat collector (1), and 1# water outlet sides are connected with domestic hot-water's water tank (4), 2# Water outlet side is connected with the 1# water outlet sides of the second electric T-shaped valve (72), the 2# water outlet sides of described the second electric T-shaped valve (72) and Influent side is connected with heating water tank (6) respectively, and 1# water outlet side of the influent side also with the 3rd electric T-shaped valve (73) is connected, described The 2# water outlet sides of electric T-shaped valve (73) are connected with Vertical U-type cluster underground pipe (2), influent side and the 4th electric T-shaped valve (74) Influent side connection, the 1# water outlet sides of described the 4th electric T-shaped valve (74) and the entrance of flat type solar heat collector (1) (11) connection is held, 2# water outlet sides are connected with the port of export (12) of flat type solar heat collector (1).

4. the resource integrated complementation of a kind of renewable energy based on cross-season heat-storage according to claim 3 utilizes system, its Be characterised by, be sequentially provided with the pipeline between described heating water tank (6) and indoor heat-exchanger rig (52) respectively with integrated control Second circulation water pump (82), first check-valve (102) and the second regulating valve (102) of cabinet (3) connection processed, described domestic hot-water Water tank (4) is provided with the first regulating valve being connected with integrated switch board (3) with bathing with the pipeline between attachment means (51) (101), be sequentially provided with the pipeline between described the second electric T-shaped valve (72) and the 3rd electric T-shaped valve (73) respectively with The first circulation water pump (81) and second check-valve (104) of integrated switch board (3) connection.

5. the resource integrated complementation of a kind of renewable energy based on cross-season heat-storage according to claim 4 utilizes system, its It is characterised by, described flat type solar heat collector (1) and its arrival end (11) and the port of export (12), the 3rd electric T-shaped valve (73) between the 4th electric T-shaped valve (74), between the 3rd electric T-shaped valve (73) and second check-valve (104), Vertical U-type It is respectively equipped with what is be connected with integrated switch board (3) on cluster underground pipe (2), in domestic hot-water's water tank (4), in heating water tank (6) Temp probe.

6. the resource integrated complementation of a kind of renewable energy based on cross-season heat-storage according to claim 2 utilizes system, its It is characterised by, electrically heated rod (41) is provided with described domestic hot-water's water tank (4) and heat exchange coil made of copper is spirally arranged (42)。

7. the resource integrated complementation of a kind of renewable energy based on cross-season heat-storage according to claim 6 utilizes system, its It is characterised by, described heat exchange coil (42) and the inwall distance of domestic hot-water's water tank (4) are 2-5cm, and coil pipe spacing is 0.5- 1.0cm, the power of electrically heated rod (41) is 3kw, and described Vertical U-type cluster underground pipe (2) buried depth is 10-15 meters.

8. the resource integrated complementary utilization of a kind of renewable energy based on cross-season heat-storage according to claim any one of 1-7 System, it is characterised in that described different working modes include annual domestic hot-water's priority of supply pattern, across season soil thermal storage Pattern, winter solar directly heating pattern, winter soil can take heat pattern and winter severe cold night anti-freezing pattern.

9. the resource integrated complementation of a kind of renewable energy based on cross-season heat-storage according to claim 8 utilizes system, its It is characterised by,

When in annual domestic hot-water's priority of supply pattern, first circulation water pump (81) is in opening, first electronic three Port valve (71), the second electric T-shaped valve (72), the 3rd electric T-shaped valve (73) and the 4th electric T-shaped valve (74) switch into Water side is turned on 1# water outlet sides, and the heat that now flat type solar heat collector (1) is collected into is heated by circulation loop and lived Boiler (4) is to provide domestic hot-water；

When in across season soil thermal storage pattern, first circulation water pump (81) is in opening, the first electric T-shaped valve (71), the second electric T-shaped valve (72) and the 4th electric T-shaped valve (74) switch to influent side and 1# water outlet sides to turn on, and the 3rd Electric T-shaped valve (73) switches to influent side to be turned on 2# water outlet sides, now flat type solar heat collector (1) and Vertical U-type collection Group's underground pipe (2) provides heat for life hot water (4) jointly；

When in winter solar energy directly heating pattern, first circulation water pump (81) is in opening, the second electric three passes Valve (72) and the 4th electric T-shaped valve (74) switch to influent side and 1# water outlet sides to turn on, the first electric T-shaped valve (71) and the Three electric T-shaped valves (73) switch to influent side and 2# water outlet sides to turn on, and now flat type solar heat collector (1) is to vertical U Type cluster underground pipe (2) transfer spring, summer, the solar energy of autumn affluence, heating soil temperature is for use in winter；

When in winter, soil took heat pattern when, the 3rd electric T-shaped valve (73) and the 4th electric T-shaped valve (74) switch into Water side is turned on 1# water outlet sides, and the first electric T-shaped valve (71) and the second electric T-shaped valve (72) switch to influent side to go out with 2# Water side is turned on, and first circulation water pump (81) and second circulation water pump (82) are in opening, and regulating valve (102), which is in, opens State, now flat type solar heat collector (1) is that heating water tank is heated so that user's request side (5) are used；

When in winter severe cold night anti-freezing pattern, the 4th electric T-shaped valve (74) switches to influent side to be led with 1# water outlet sides It is logical, the first electric T-shaped valve (71), the second electric T-shaped valve (72) and the 3rd electric T-shaped valve (73) switch to influent side and 2# water outlet sides are turned on, and first circulation water pump (81) is in opening, now the storage of Vertical U-type cluster underground pipe (2) spring and summer autumn The heat deposited is discharged, heating water tank (6).