Selective solar heat pump combined heat supply system

Abstract

The utility model discloses a selective solar heat pump combined heat supply system which comprises a heat preservation water tank, a solar water inlet unit, a heat pump water inlet unit and a heat supply water pipe, the heat preservation water tank is used for storing hot water, the solar water inlet unit is connected with the heat preservation water tank and used for supplying hot water to the heat preservation water tank, and the heat pump water inlet unit is connected with the heat preservation water tank and used for supplying hot water to the heat preservation water tank. According to the solar energy and heat pump combined heat supply system, an existing solar energy and heat pump combined heat supply system is improved, and the system is mainly improved from a selective water inlet mode, practicability, system intelligence, system convenience and system stability; aiming at a selective water inlet mode, the system can utilize solar energy preferentially, avoids waste of the solar energy, utilizes the solar energy more fully, selectively utilizes the heat pump for complementation, avoids repeated heating of the heat pump, and accordingly realizes real energy conservation.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water supply, in particular to a selective solar heat pump combined heating system. Background Technique

[0002] The combination of solar energy and heat pump is the best way to supply hot water at present. However, the heating conditions of solar energy and heat pump conflict with each other. Solar energy can only supply heat when there is sunlight (during the day), and the heat pump has a long heating time. After the two are combined, when the solar energy works, when the heat pump works, whether there will be repeated heating, and whether the heating is insufficient have become the main problems of the solar heat pump combined system in the current market. Nowadays, the solar heat pump combined system either repeats heating all day long and cannot achieve the energy-saving effect, or the heat pump starts too late, resulting in insufficient heating, etc., which will ultimately affect the user experience.

[0003] Therefore, it is necessary to design a selective solar heat pump combined heating system to solve the problems in the above background technique. Content of the Utility Model

[0004] 1. Technical Problems to be Solved by the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a selective solar heat pump combined heating system, aiming to solve the problems that solar energy and heat pump cannot be reasonably allocated for heating, cannot achieve the energy-saving effect or consume too much energy in the prior art.

[0006] 2. Technical Solution

[0007] To achieve the above purpose, the utility model provides the following technical solution:

[0008] A selective solar heat pump combined heating system, comprising:

[0009] A heat preservation water tank for storing hot water;

[0010] A solar water inlet unit connected to the heat preservation water tank for supplying hot water to the heat preservation water tank;

[0011] A heat pump water inlet unit connected to the heat preservation water tank for supplying hot water to the heat preservation water tank;

[0012] A hot water supply pipe connected to the heat preservation water tank, and the heat preservation water tank supplies hot water to the hot water supply pipe;

[0013] Among them, the solar water inlet unit is preferably selected to supply hot water to the heat preservation water tank.

[0014] Preferably, a liquid level sensor and a first temperature sensing probe are arranged in the heat preservation water tank.

[0015] Preferably, the solar water inlet unit includes a solar energy device. The water inlet end of the solar energy device is connected to a first cold water inlet pipe. One end of the first cold water inlet pipe is connected to a water supply pipeline. A first booster pump and a first solenoid valve are connected to the first cold water inlet pipe. A first water inlet pipe is connected between the water outlet end of the solar energy device and the heat preservation water tank. A second solenoid valve is connected to the first water inlet pipe. A second temperature sensor probe is arranged in the solar energy device. The solar water inlet unit further includes a first circulation assembly.

[0016] Preferably, the first circulation assembly includes a first circulation pipe connected between the heat preservation water tank and the water inlet end of the solar energy device. A first circulation pump is connected to the first circulation pipe.

[0017] Preferably, the heat pump water inlet unit includes a heat pump device. The water inlet end of the heat pump device is connected to a second cold water inlet pipe. One end of the second cold water inlet pipe is connected to a water supply pipeline. A third solenoid valve is connected to the second cold water inlet pipe. A second water inlet pipe is connected between the water outlet end of the heat pump device and the heat preservation water tank. A fourth solenoid valve is connected to the second water inlet pipe. The heat pump water inlet unit further includes a second circulation assembly.

[0018] Preferably, the second circulation assembly includes a second circulation pipe connected between the water inlet end of the heat pump device and the heat preservation water tank. A second circulation pump is connected to the second circulation pipe.

[0019] Preferably, a water delivery pipe is connected between the water inlet end of the hot water supply pipe and the heat preservation water tank. A second booster pump and a fifth solenoid valve are connected to the water delivery pipe. A water return pipe is connected between the water outlet end of the hot water supply pipe and the heat preservation water tank. A sixth solenoid valve is connected to the water return pipe.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] In this utility model, by improving the existing solar energy and heat pump combined heating system, this system is mainly improved from three aspects: selective water inlet mode, practicability, and system intelligence, convenience and stability. Regarding the selective water inlet mode, this system can give priority to using solar energy, avoid waste of solar energy, make more full use of solar energy, and selectively use the heat pump to supplement it, avoiding repeated heating of the heat pump, thus achieving true energy conservation. Regarding practicability, this system can always produce available hot water whether it is solar energy or the heat pump, ensuring the water temperature at the end point of water intake, truly realizing 24-hour availability of hot water at any time and ensuring the supply water temperature, with a deviation from the specified water temperature not exceeding 5%. Regarding the system intelligence, convenience and stability, the control part of this system adopts PLC integrated control. The system automatically starts and stops each electrical equipment of the system according to the command conditions, automatically judges the faults of the conventional system, and can guide users to remove the faults in time. The system is integrated control, greatly reducing the failure rate of the system itself and improving the stability of the system. Brief Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the principle of a selectable solar energy and heat pump combined heating system;

[0024] Figure 2 It is a schematic diagram of the connection structure of the heat preservation water tank of the present utility model.

[0025] In the figure: 1. Heat preservation water tank; 2. Solar energy water inlet unit; 201. Solar energy equipment; 202. First cold water inlet pipe; 203. First booster pump; 204. First solenoid valve; 205. First water inlet pipe; 206. Second solenoid valve; 207. First circulation pipe; 208. First circulation pump; 3. Heat pump water inlet unit; 301. Heat pump equipment; 302. Second cold water inlet pipe; 303. Third solenoid valve; 304. Second water inlet pipe; 305. Fourth solenoid valve; 306. Second circulation pipe; 307. Second circulation pump; 4. Hot water supply pipe; 401. Water delivery pipe; 402. Second booster pump; 403. Fifth solenoid valve; 404. Return pipe; 405. Sixth solenoid valve. Specific Embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment:

[0028] Please refer to Figure 1 - Figure 2, this embodiment provides a selective solar heat pump combined heating system, including a heat preservation water tank 1, a solar water inlet unit 2, a heat pump water inlet unit 3 and a hot water supply pipe 4. The heat preservation water tank 1 is used to store hot water. The solar water inlet unit 2 is connected to the heat preservation water tank 1 and is used to supply hot water to the heat preservation water tank 1. The heat pump water inlet unit 3 is connected to the heat preservation water tank 1 and is used to supply hot water to the heat preservation water tank 1. The hot water supply pipe 4 is connected to the heat preservation water tank 1, and the heat preservation water tank 1 supplies hot water to the hot water supply pipe 4. It is preferred to select the solar water inlet unit 2 to supply hot water to the heat preservation water tank 1. The water inlet methods of both the solar water inlet unit 2 and the heat pump water inlet unit 3 adopt the direct heating type, that is, they enter the water tank only when reaching the specified temperature. The solar water inlet unit 2 is preferentially used to supply hot water to the heat preservation water tank 1 to avoid waste of solar energy. When the hot water supply of the solar water inlet unit 2 is insufficient, the heat pump water inlet unit 3 is selectively used to make up for it, avoiding repeated heating of the heat pump and achieving energy saving. No matter it is the solar water inlet unit 2 or the heat pump water inlet unit 3, the hot water generated at any time is available hot water, ensuring the water temperature at the end point of water intake and realizing the supply of available hot water at any time for 24 hours.

[0029] In this embodiment, a liquid level sensor and a first temperature sensing probe are arranged in the heat preservation water tank 1. The liquid level sensor is used to measure the hot water level in the heat preservation water tank 1, and the first temperature sensing probe is used to measure the water temperature of the hot water in the heat preservation water tank 1.

[0030] In this embodiment, a water supply pipe 401 is connected between the water inlet end of the hot water supply pipe and the heat preservation water tank 1. A second booster pump 402 and a fifth solenoid valve 403 are connected to the water supply pipe 401. A water return pipe 404 is connected between the water outlet end of the hot water supply pipe 4 and the heat preservation water tank 1. A sixth solenoid valve 405 is connected to the water return pipe 404. When supplying water, the second booster pump 402 starts to work and the fifth solenoid valve 403 opens to transport the hot water in the heat preservation water tank 1 into the hot water supply pipe 4 for distribution and use. The excess hot water flows back into the heat preservation water tank 1 through the sixth solenoid valve 405 opening and the water return pipe 404.

[0031] In this embodiment, the solar water inlet unit 2 includes a solar energy device 201. The water inlet end of the solar energy device 201 is connected to a first cold water inlet pipe 202. One end of the first cold water inlet pipe 202 is connected to the tap water pipeline. A first booster pump 203 and a first solenoid valve 204 are connected to the first cold water inlet pipe 202. A first water inlet pipe 205 is connected between the water outlet end of the solar energy device 201 and the heat preservation water tank 1. A second solenoid valve 206 is connected to the first water inlet pipe 205. A second temperature sensor probe is arranged in the solar energy device 201. When supplying hot water to the heat preservation water tank 1 through the solar water inlet unit 2, the first booster pump 203 works, the first solenoid valve 204 is opened, cold water is filled into the solar energy device 201 through the first water inlet pipe 205, the solar energy device 201 uses solar energy to heat the hot water, the water temperature in the solar energy device 201 is measured by the second temperature sensor probe. After the water in the solar energy device 201 is heated to the preset temperature (the target water temperature is 55 degrees), the second solenoid valve 206 is opened to transport the hot water into the heat preservation water tank 1 through the first water inlet pipe 205 for storage. Through the solar energy device 201 storing and heating water to the preset temperature multiple times, the heat preservation water tank 1 is filled up.

[0032] As an implementation manner of this embodiment, the heat pump water inlet unit 3 includes a heat pump device 301. The water inlet end of the heat pump device 301 is connected to a second cold water inlet pipe 302. A third solenoid valve 303 is connected to the second cold water inlet pipe 302. A second water inlet pipe 304 is connected between the water outlet end of the heat pump device 301 and the heat preservation water tank 1. A fourth solenoid valve 305 is connected to the second water inlet pipe 304. When supplying hot water to the heat preservation water tank 1 through the heat pump water inlet unit 3, the third solenoid valve 303 is opened to transport cold water into the heat pump device 301 for heating to the preset temperature, and then the fourth solenoid valve 305 is opened to transport the hot water into the heat preservation water tank 1 through the second water inlet pipe 304 for storage.

[0033] As an implementation manner of this embodiment, the solar water inlet unit 2 is preferentially selected to supply hot water to the heat preservation water tank 1 among the solar water inlet unit 2 and the heat pump water inlet unit 3. When the hot water supply of the solar water inlet unit 2 is insufficient, the heat pump water inlet unit 3 is started to make up. The judgment basis is to select whether the heat pump water inlet unit 3 works according to the set water level reached by the heat preservation water tank 1 within the set time. In spring and summer seasons and sunny environments, with sufficient sunlight, the solar water inlet unit 2 meets the water storage requirements of the heat preservation water tank 1. In autumn and winter seasons and rainy weather environments, with insufficient sunlight, the solar water inlet unit 2 cannot meet the water storage requirements of the heat preservation water tank 1, then the heat pump water inlet unit 3 works for water replenishment. For example:

[0034] At 10:00 am, if the water level in the heat preservation water tank 1 reaches 25%, it proves that the weather is good and the sunlight is sufficient, and the solar water inlet unit 2 can meet the water storage requirements in the heat preservation water tank 1. At this time, the heat pump water inlet unit 3 does not need to be started; if the water level in the heat preservation water tank 1 does not reach 25%, it proves that the weather is bad and the sunlight is insufficient. At this time, the solar water inlet unit 2 cannot meet the water storage requirements of the heat preservation water tank 1, and the heat pump water inlet unit 3 should be started immediately to fill the water level in the heat preservation water tank 1 up to 25%.

[0035] At 12:00 noon, if the water level in the heat preservation water tank 1 reaches 50%, it proves that the weather is good and the sunlight is sufficient, and the solar water inlet unit 2 can meet the water storage requirements in the heat preservation water tank 1. At this time, the heat pump water inlet unit 3 does not need to be started; if the water level in the heat preservation water tank 1 does not reach 25%, it proves that the weather is bad and the sunlight is insufficient. At this time, the solar water inlet unit 2 cannot meet the water storage requirements of the heat preservation water tank 1, and the heat pump water inlet unit 3 should be started immediately to fill the water level in the heat preservation water tank 1 up to 50%.

[0036] At 2:00 pm, if the water level in the heat preservation water tank 1 reaches 75%, it proves that the weather is good and the sunlight is sufficient, and the solar water inlet unit 2 can meet the water storage requirements in the heat preservation water tank 1. At this time, the heat pump water inlet unit 3 does not need to be started; if the water level in the heat preservation water tank 1 does not reach 75%, it proves that the weather is bad and the sunlight is insufficient. At this time, the solar water inlet unit 2 cannot meet the water storage requirements of the heat preservation water tank 1, and the heat pump water inlet unit 3 should be started immediately to fill the water level in the heat preservation water tank 1 up to 75%.

[0037] At 4:00 pm, if the water level in the heat preservation water tank 1 reaches 100%, it proves that the weather is good and the sunlight is sufficient, and the solar water inlet unit 2 can meet the water storage requirements in the heat preservation water tank 1. At this time, the heat pump water inlet unit 3 does not need to be started; if the water level in the heat preservation water tank 1 does not reach 100%, it proves that the weather is bad and the sunlight is insufficient. At this time, the solar water inlet unit 2 cannot meet the water storage requirements of the heat preservation water tank 1, and the heat pump water inlet unit 3 should be started immediately to fill the water level in the heat preservation water tank 1 up to 100%.

[0038] It should be noted that in another embodiment, the time and water level for measuring the water level in the heat preservation water tank 1 can be set according to the actual situation.

[0039] In this embodiment, the solar water inlet unit 2 further includes a first circulation component. The first circulation component includes a first circulation pipe 207 connected between the water inlet end of the heat preservation water tank 1 and the solar device 201. A first circulation pump 208 is connected to the first circulation pipe 207. When the water level in the heat preservation water tank 1 reaches 100% and the heat pump water inlet unit 3 does not start working on the same day, it means that the solar water inlet unit 2 meets the water storage requirement of the heat preservation water tank 1 on the same day and there is still surplus solar energy not utilized. At this time, the first circulation pump 208 works to circulate and transport the hot water in the heat preservation water tank 1 into the solar water inlet unit 2 for reheating, heating the hot water in the heat preservation water tank 1 to a higher water temperature and making more full use of solar energy.

[0040] In this embodiment, the heat pump water inlet unit 3 further includes a second circulation component. The second circulation component includes a second circulation pipe 306 connected between the water inlet end of the heat pump device 301 and the heat preservation water tank 1. A second circulation pump 307 is connected to the second circulation pipe 306. When the water temperature in the heat preservation water tank 1 drops to the lowest set value (preset 50 degrees, temperature adjustable) measured by the first temperature sensor probe, at this time, the second circulation pump 307 works to circulate and transport the hot water in the heat preservation water tank 1 into the heat pump device 301 through the second circulation pipe 306 to heat and keep warm the heat preservation water tank 1 and ensure the water supply water temperature.

[0041] In this embodiment, the selectable solar heat pump combined heating system further includes a PLC control device. The second temperature sensor probe, the first booster pump 203, the first solenoid valve 204, the second solenoid valve 206, the first circulation pump 208, the heat pump device 301, the third solenoid valve 303, the fourth solenoid valve 304, the second circulation pump 307, the second booster pump 402, the fifth solenoid valve 403, the sixth solenoid valve 405, the liquid level sensor and the first temperature sensor probe in the heat preservation water tank 1 in the solar water inlet unit are all electrically connected to the PLC control device. The control mode of the present utility model is controlled by the PLC control device. The control program of the PLC control device can be realized by simple programming of those skilled in the art. Therefore, the control mode and circuit connection of the present utility model will not be explained in detail. The system automatically commands the start and stop of each electrical device of the system according to the command conditions, automatically judges the faults of the conventional system, can guide the user to remove the faults in time, the system is integrated control, greatly reduces the failure rate of the system itself, improves the stability of the system, has low operation cost, is truly energy-saving and environment-friendly, easy to use and stable, integrated control, reduces a lot of fault points and is convenient for maintenance and repair.

[0042] The selective solar energy heat pump combined heating system of this embodiment is mainly improved from three aspects: selective water inlet mode, practicability, and system intelligence, convenience and stability. Regarding the selective water inlet mode, this system can give priority to using solar energy, avoid waste of solar energy, make more full use of solar energy, with an annual average energy consumption of ≤6 degrees / ton (target water temperature of 55 degrees), and selectively use the heat pump to make up for it to avoid repeated heating of the heat pump, thus achieving true energy conservation; regarding practicability, whether it is solar energy or the heat pump in this system, the hot water generated at any time is available, ensuring the water temperature at the end point of water intake, truly realizing the availability of hot water at any time for 24 hours and ensuring the water supply temperature, with a deviation from the specified water temperature not exceeding 5%; regarding system intelligence, convenience and stability, the control part of this system adopts PLC integrated control. The system automatically starts and stops each electrical equipment of the system according to the command conditions, automatically judges the faults of the conventional system, and can guide users to remove the faults in time. The system is integrated control, greatly reducing the failure rate of the system itself and improving the stability of the system.

[0043] The above embodiments are the preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. A selective solar heat pump combined heating system, characterized in that: include: An insulated water tank (1), the insulated water tank (1) being used to store hot water; A solar water inlet unit (2), the solar water inlet unit (2) being connected to the thermal insulation water tank (1) and being used to supply hot water to the thermal insulation water tank (1); A heat pump water inlet unit (3), the heat pump water inlet unit (3) being connected to the thermal insulation water tank (1) and being used to supply hot water to the thermal insulation water tank (1); A hot water supply pipe (4), the hot water supply pipe (4) being connected to a heat-insulating water tank (1), and the heat-insulating water tank (1) supplies hot water to the hot water supply pipe (4); The solar water inlet unit (2) is preferably selected to supply hot water to the thermal insulation water tank (1); The solar water inlet unit (2) comprises a solar device (201); a water inlet end of the solar device (201) is connected to a first cold water inlet pipe (202); one end of the first cold water inlet pipe (202) is connected to a tap water pipeline; a first booster pump (203) and a first solenoid valve (204) are connected to the first cold water inlet pipe (202); a first water inlet pipe (205) is connected between a water outlet end of the solar device (201) and a thermal insulation water tank (1); a second solenoid valve (206) is connected to the first water inlet pipe (205); a second temperature sensor is arranged in the solar device (201); and the solar water inlet unit (2) further comprises a first circulation component; The heat pump water inlet unit (3) comprises a heat pump device (301); a water inlet end of the heat pump device (301) is connected to a second cold water inlet pipe (302); one end of the second cold water inlet pipe (302) is connected to a tap water pipeline; a third solenoid valve (303) is connected to the second cold water inlet pipe (302); a second water inlet pipe (304) is connected between the water outlet end of the heat pump device (301) and the thermal insulation water tank (1); a fourth solenoid valve (305) is connected to the second water inlet pipe (304); and the heat pump water inlet unit (3) further comprises a second circulation component.

2. A selective solar heat pump combined heating system according to claim 1, characterized in that: A liquid level sensor and a first temperature sensing probe are arranged in the thermal insulation water tank (1).

3. A selective solar heat pump combined heating system according to claim 1, characterized in that: The first circulation component comprises a first circulation pipe (207) connected between the thermal insulation water tank (1) and the water inlet end of the solar energy device (201), and the first circulation pipe (207) is connected to a first circulation pump (208).

4. A selective solar heat pump combined heating system according to claim 1, characterized in that: The second circulation component comprises a second circulation pipe (306) connected between the water inlet end of the heat pump device (301) and the thermal insulation water tank (1), and a second circulation pump (307) is connected to the second circulation pipe (306).

5. A selective solar heat pump combined heating system according to claim 1, characterized in that: A water supply pipe (401) is connected between the water inlet end of the hot water supply pipe and the insulated water tank (1), and a second booster pump (402) and a fifth solenoid valve (403) are connected to the water supply pipe (401). A water return pipe (404) is connected between the water outlet end of the hot water supply pipe (4) and the insulated water tank (1), and six solenoid valves (405) are connected to the water return pipe (404).

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