Solar energy and ground source heat pump coupled energy-saving heating system

Abstract

The utility model relates to the technical field of energy-saving heating systems, and discloses a solar energy and ground source heat pump coupled energy-saving heating system which comprises a heating water inlet pipeline, a heating water outlet pipeline, a heat preservation water tank, a solar heat collector, a ground source heat pump condenser and a ground source heat pump evaporator. The output end and the input end of the solar heat collector are both communicated with the heat preservation water tank through pipelines. Heat energy provided by the solar heat collector is fully used for heating, the ground source heat pump is used as auxiliary energy, the whole heating system is efficient and energy-saving, the use cost of heating is very low, meanwhile, the electric load of the ground source heat pump is very small, clean energy heating can be achieved in remote areas where electricity capacity increasing is difficult to achieve, and in non-heating seasons, the ground source heat pump is used as auxiliary energy. Heat energy obtained by the solar heat collector is used for supplementing heat energy lost by soil in winter, heat energy balance of stable heating of the buried pipe all the year round is effectively guaranteed, and heat energy collected by solar energy is also consumed.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving heating systems, and in particular to an energy-saving heating system coupled with solar energy and a ground source heat pump. Background Art

[0002] At present, geothermal heat pump is a highly efficient and energy-saving device that can provide both heating and cooling by utilizing shallow thermal resources. Geothermal heat pump realizes the transfer of low-temperature heat energy to high-temperature heat energy through a small amount of high-level energy such as electricity. Geothermal energy is used as a heat source for heat pump heating in winter and a cold source for cooling in summer. However, due to the large amount of energy required to be provided, traditional geothermal heat pumps are large in size, have high construction costs, occupy a large area, and consume a lot of energy. Solar energy collection is currently mainly used for hot water supply, but due to the influence of weather and climate, especially in areas with lower temperatures or in winter, the effect of solar energy collection is not good.

[0003] In the Chinese patent with publication number CN203489521U, a solar energy and ground source heat pump combined energy-saving system is disclosed, including an insulated water tank, a solar heat collection module, a ground source heat pump hot water supply module, a ground source heat pump heating-cooling module, and a controller. The lower part of the insulated water tank is connected to the tap water inlet pipe, and the upper part of the insulated water tank is connected to the hot water outlet pipe. The solar heat exchange coil is located in the insulated water tank. One end of the solar heating pipe and the solar circulation pipe are respectively connected to the two ends of the solar heat exchange coil, and the other end of the solar circulation pipe is connected to the liquid inlet of the solar collector, and the other end of the solar heating pipe is connected to the liquid outlet of the solar collector. The utility model adopts the method of combining solar heat collection with ground source heat pump, which is not only energy-saving and environmentally friendly, safe and reliable, and has good effects, but also low cost, small overall system footprint, simple maintenance, low maintenance costs, and long service life.

[0004] However, the prior art combines solar thermal collection with ground source heat pumps. When the solar thermal collection is sufficient to meet the hot water demand and has a surplus, the excess solar energy is only used for heating. However, for northern regions, the heating time is relatively long in winter and the cooling time is very short in summer. In particular, many heating terminals are heat sinks and cannot achieve cooling. As a result, the corresponding thermal energy compensation is not achieved for the soil around the buried pipes, which easily leads to the problem of the heating capacity of the buried pipes declining year by year. How to use solar energy for thermal energy compensation is a problem that the prior art has not been able to solve. Utility Model Content

[0005] The utility model aims to solve the problems existing in the prior art and proposes an energy-saving heating system that couples solar energy with a ground source heat pump.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An energy-saving heating system coupled with solar energy and a ground-source heat pump comprises a heating water inlet pipe, a heating water outlet pipe, an insulated water tank, a solar collector, a ground-source heat pump condenser and a ground-source heat pump evaporator, wherein a heat exchange coil is arranged in the insulated water tank, the output end and the input end of the solar collector are both connected to the insulated water tank through a pipeline, the insulated water tank is connected to the input end of the ground-source heat pump condenser through a first connecting pipe, the output end of the ground-source heat pump condenser is connected to the input end of the heating water inlet pipe, the output end of the heating water outlet pipe is connected to the insulated water tank, and further comprises an underground water inlet pipe and an underground water outlet pipe. One end of the underground water inlet pipe and the underground water outlet pipe both pass through the insulated water tank and are respectively connected to the two ends of the heat exchange coil; the underground water inlet pipe and the underground water outlet pipe are both connected with a second connecting pipe, and the two second connecting pipes are respectively connected to the output end and the input end of the ground source heat pump evaporator; the heating water outlet pipe, the output end pipeline of the solar collector and the underground water outlet pipe are all provided with a pump body; the heating water inlet pipe, the heating water outlet pipe, the output end and the input end pipeline of the solar collector, the underground water inlet pipe, the underground water outlet pipe, the first connecting pipe and the two second connecting pipes are all provided with solenoid valves.

[0008] Preferably, it also includes a solar photovoltaic panel and a battery, the energy output end of the solar photovoltaic panel is connected to the energy input end of the battery via a photovoltaic converter, and the battery is electrically connected to a number of solenoid valves, a ground source heat pump condenser and a ground source heat pump evaporator.

[0009] Preferably, a temperature sensor is provided in the thermal insulation water tank, and a signal output end of the temperature sensor is connected to a signal input end of the solenoid valve and a pump body via a control processor.

[0010] Preferably, it also includes an exhaust fan, which is connected to the solar collector through a heat conductor, and the underground water inlet pipe and the underground water outlet pipe are respectively connected to the output end and the input end of the exhaust fan through a third connecting pipe.

[0011] Preferably, the underground water outlet pipe and the heating water outlet pipe are both provided with a constant pressure tank and a liquid replenishing port.

[0012] Preferably, the second connecting pipe and the heating water outlet pipe are both provided with thermometers, and the first connecting pipe is provided with a target flow switch.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model makes full use of the heat energy provided by the solar thermal collector for heating, and uses the ground source heat pump as an auxiliary energy source. The entire heating system is highly efficient and energy-saving, and the heating cost is very low. At the same time, the electrical load of the ground source heat pump is also very small, which is conducive to achieving clean energy heating in remote areas where it is difficult to increase the capacity of electricity. In the non-heating season, the heat energy obtained by the solar thermal collector is used to supplement the heat energy lost by the soil in winter, which effectively ensures the thermal energy balance of the buried pipe for stable heating all year round, and also absorbs the heat energy collected by the solar energy. Compared with the existing technology, this system uses the mutual coupling of solar energy and ground source heat pump to achieve the best sustainable heating effect, and the use effect is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall schematic diagram of an energy-saving heating system coupled with solar energy and ground-source heat pumps proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of the connection between an exhaust fan and a solar collector of an energy-saving heating system coupled with solar energy and a ground-source heat pump proposed by the utility model.

[0017] In the figure: 1. Heating water inlet pipe; 2. Solar collector; 3. Insulated water tank; 4. Heating water outlet pipe; 5. Ground source heat pump condenser; 6. Ground source heat pump evaporator; 7. Heat exchange coil; 8. First connecting pipe; 9. Second connecting pipe; 10. Third connecting pipe; 11. Temperature sensor; 12. Solar photovoltaic panel; 13. Battery; 14. Exhaust fan; 15. Pump body; 16. Solenoid valve; 17. Underground water inlet pipe; 18. Underground water outlet pipe; 19. Heat conductor. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1 and Figure 2, an energy-saving heating system coupled with solar energy and ground source heat pump, comprising a heating water inlet pipe 1, a heating water outlet pipe 4, an insulated water tank 3, a solar collector 2, a ground source heat pump condenser 5 and a ground source heat pump evaporator 6, wherein the insulated water tank 3 is provided with a heat exchange coil 7, the output end and the input end of the solar collector 2 are both connected to the insulated water tank 3 through a pipeline, the insulated water tank 3 is connected to the input end of the ground source heat pump condenser 5 through a first connecting pipe 8, the output end of the ground source heat pump condenser 5 is connected to the input end of the heating water inlet pipe, the output end of the heating water outlet pipe 4 is connected to the insulated water tank 3, and also comprises an underground water inlet pipe 17 and an underground water outlet pipe 18, the underground inlet One end of the water pipe 17 and the underground water outlet pipe 18 both penetrate into the insulated water tank 3 and are respectively connected to the two ends of the heat exchange coil 7. The underground water inlet pipe 17 and the underground water outlet pipe 18 are both connected with a second connecting pipe 9, and the two second connecting pipes 9 are respectively connected to the output end and the input end of the ground source heat pump evaporator 6. The heating water outlet pipe 4, the output end pipeline of the solar collector 2 and the underground water outlet pipe 18 are all provided with a pump body 15. The heating water inlet pipe 1, the heating water outlet pipe 4, the output end and input end pipelines of the solar collector 2, the underground water inlet pipe 17, the underground water outlet pipe 18, the first connecting pipe 8 and the two second connecting pipes 9 are all provided with a solenoid valve 16.

[0020] When the device is in use, since the solar collector 2 is connected to the insulated water tank 3, a temperature difference cycle can be realized; the ground source heat pump condenser 5 is connected to the heating circuit and is connected in series to the insulated water tank 3; the ground source heat pump evaporator 6 is connected to the buried pipe and forms a parallel relationship with the coil in the insulated water tank 3;

[0021] In winter, when the heat energy of the solar collector 2 keeps the water temperature in the insulated water tank 3 above a certain temperature, the ground source heat pump does not start, and solar energy is used for heating first; when the water temperature in the insulated water tank 3 is lower than the set temperature, the ground source heat pump starts heating; at this time, the solenoid valves 16 at both ends of the heat exchange coil 7 in the insulated water tank 3 are closed, and the circulating working fluid in the buried pipe provides heat energy for the ground source heat pump; in the non-heating season, when the heat energy of the solar collector 2 makes the water temperature in the insulated water tank 3 reach the set temperature, the circulating working fluid in the buried pipe circulates and exchanges heat with the hot water in the insulated water tank 3, and transfers heat energy to the soil. At this time, the pipeline solenoid valve 16 corresponding to the evaporator 6 of the ground source heat pump is closed, and the ground source heat pump does not operate;

[0022] Such a coupling relationship can effectively maintain the relative balance of soil thermal energy and realize a sustainable and effective ground-source heat pump heating process. At the same time, it can make full use of solar energy resources to minimize heating costs, make full use of the thermal energy provided by the solar collector 2 for heating, and use the ground-source heat pump as an auxiliary energy source. The entire heating system is highly efficient and energy-saving, and the heating cost is very low. At the same time, the electrical load of the ground-source heat pump is also very small, which is conducive to achieving clean energy heating in remote areas where it is difficult to increase electrical capacity. In the non-heating season, the heat energy obtained by the solar collector 2 is used to supplement the heat energy lost by the soil in winter, which effectively ensures the thermal energy balance of the buried pipe for long-term stable heating, and also absorbs the heat energy collected by the solar energy. Compared with the existing technology, this system uses the mutual coupling of solar energy and ground-source heat pump to achieve the best sustainable heating effect, and the use effect is excellent.

[0023] In this embodiment, a solar photovoltaic panel 12 and a battery 13 are also included. The energy output end of the solar photovoltaic panel 12 is connected to the energy input end of the battery 13 via a photovoltaic converter. The battery 13 is electrically connected to a plurality of solenoid valves 16, a ground source heat pump condenser 5 and a ground source heat pump evaporator 6. The solar photovoltaic panel 12 can use solar energy to charge the battery 13 and supply power to the entire system, thereby making full use of clean energy.

[0024] In this embodiment, a temperature sensor 11 is provided in the insulated water tank 3. The signal output end of the temperature sensor 11 is connected to the signal input end of the solenoid valve 16 and the pump body 15 through the control processor. The temperature sensor 11 is used to monitor the water temperature in the insulated water tank 3, so as to judge whether to enable the ground source heat pump, the solenoid valve 16 and the pump body 15 according to the water temperature of the insulated water tank 3, so as to realize "in winter, when the heat energy of the solar collector 2 makes the water temperature in the insulated water tank 3 remain above a certain temperature, the ground source heat pump is not started, and the solar collector 2 is used first. can provide heating; when the water temperature in the insulated water tank 3 is lower than the set temperature, the ground source heat pump starts heating; at this time, the solenoid valves 16 at both ends of the heat exchange coil 7 in the insulated water tank 3 are closed, and the circulating working fluid in the buried pipe provides heat energy for the ground source heat pump; in the non-heating season, when the heat energy of the solar collector 2 makes the water temperature in the insulated water tank 3 reach the set temperature, the circulating working fluid in the buried pipe and the hot water in the insulated water tank 3 circulate heat exchange to transfer heat energy to the soil. At this time, the pipeline solenoid valve 16 corresponding to the evaporator 6 of the ground source heat pump is closed, and the ground source heat pump does not run.

[0025] In this embodiment, an exhaust fan 14 is also included. The underground water inlet pipe 17 and the underground water outlet pipe 18 are respectively connected to the output end and the input end of the exhaust fan 14 through the third connecting pipe 10. The exhaust fan 14 is connected to the solar collector 2 through a heat conductor 19. One end of the heat conductor 19 is connected to the heat collecting position of the solar collector 2, and the other end passes through the interior of the exhaust fan 14 and is located on one side of the fan blade of the exhaust fan 14. The third connecting pipe 10 is also provided with a solenoid valve 16. The exhaust fan 14 exchanges heat with the solar collector 2. When the water in the thermal insulation water tank 3 is insufficient to compensate for the soil heat energy, or when the water in the thermal insulation water tank 3 is heated first, the exhaust fan 14 can make full use of the heat energy captured by the solar collector 2, and transmit the air to the underground water inlet pipe 17 and the underground water outlet pipe 18 through the third connecting pipe 10 to achieve heat energy compensation.

[0026] In this embodiment, the underground water outlet pipe and the heating water outlet pipe 4 are both provided with a constant pressure tank and a liquid replenishment port, which constitute a constant pressure water replenishment device to absorb or supplement the increase or decrease in water volume caused by temperature changes in the system. When the system temperature increases, the water volume increases. At this time, the system pressure is greater than the gas pressure in the tank, and part of the water will be pressed into the capsule in the tank until the pressure of the gas in the tank reaches equilibrium with the system pressure. When the system temperature decreases, the water volume decreases. At this time, the gas pressure in the tank is greater than the system pressure, and part of the water will be pressed back into the system, playing a role in replenishing water to the system.

[0027] In this embodiment, the second connecting pipe 9 and the heating water outlet pipe 4 are both provided with thermometers for monitoring the outlet water temperature, and the first connecting pipe 8 is provided with a target flow switch for realizing water flow detection and control.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An energy-saving heating system coupled with solar energy and a ground source heat pump, comprising a heating water inlet pipe, a heating water outlet pipe, an insulated water tank, a solar collector, a ground source heat pump condenser and a ground source heat pump evaporator, wherein a heat exchange coil is arranged in the insulated water tank, the output end and the input end of the solar collector are both connected to the insulated water tank through a pipeline, the insulated water tank is connected to the input end of the ground source heat pump condenser through a first connecting pipe, the output end of the ground source heat pump condenser is connected to the input end of the heating water inlet pipe, and the output end of the heating water outlet pipe is connected to the insulated water tank, characterized in that: It also includes an underground water inlet pipe and an underground water outlet pipe, one end of which passes through the insulated water tank and is respectively connected to the two ends of the heat exchange coil. The underground water inlet pipe and the underground water outlet pipe are both connected with a second connecting pipe, and the two second connecting pipes are respectively connected to the output end and the input end of the ground source heat pump evaporator. The heating water outlet pipe, the output end pipeline of the solar collector and the underground water outlet pipe are all provided with a pump body. The heating water inlet pipe, the heating water outlet pipe, the output end and the input end pipeline of the solar collector, the underground water inlet pipe, the underground water outlet pipe, the first connecting pipe and the two second connecting pipes are all provided with solenoid valves.

2. The energy-saving heating system coupled with solar energy and ground source heat pump according to claim 1 is characterized in that: It also includes a solar photovoltaic panel and a battery. The energy output end of the solar photovoltaic panel is connected to the energy input end of the battery via a photovoltaic converter. The battery is electrically connected to a plurality of solenoid valves, a ground source heat pump condenser and a ground source heat pump evaporator.

3. The energy-saving heating system coupled with solar energy and ground source heat pump according to claim 2 is characterized in that: A temperature sensor is arranged in the thermal insulation water tank, and a signal output end of the temperature sensor is connected to a signal input end of the electromagnetic valve and a pump body via a control processor.

4. The energy-saving heating system coupled with solar energy and ground source heat pump according to claim 2 is characterized in that: It also includes an exhaust fan, which is connected to the solar collector through a heat conductor, and the underground water inlet pipe and the underground water outlet pipe are respectively connected to the output end and the input end of the exhaust fan through a third connecting pipe.

5. The energy-saving heating system coupled with solar energy and ground source heat pump according to claim 1 is characterized in that: The underground water outlet pipe and the heating water outlet pipe are both provided with a constant pressure tank and a liquid replenishing port.

6. The energy-saving heating system coupled with solar energy and ground source heat pump according to claim 1, characterized in that: The second connecting pipe and the heating water outlet pipe are both provided with thermometers, and the first connecting pipe is provided with a target flow switch.

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