Solar energy-heat pump combined heat supply system

Abstract

The utility model provides a solar energy-heat pump combined heat supply system, which comprises a water supply pump, a heat pump and a heat pump, the mixed water tank is provided with a first water inlet, a second water inlet and a water outlet, a first water supply path is formed between the water pump water outlet and the first water inlet, and a second water supply path is formed between the water pump water outlet and the second water inlet; the solar water heater is arranged on the first water supply path, and the first water supply path is further provided with a first flow meter and a first thermometer which are adjacent to the downstream of a water outlet of the solar water heater; a first regulating valve disposed on the first water supply path; the heat pump unit is provided with an air cooler, and the air cooler is located on the second water supply path; the second water supply path is further provided with a second flowmeter and a second thermometer which are adjacent to the downstream of the second branch; a second regulating valve disposed on the second water supply path; the controller is in signal connection with the first flow meter, the first thermometer, the first adjusting valve, the second flow meter, the second thermometer and the second adjusting valve at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, in particular to a solar energy-heat pump combined heating system. Background Art

[0002] A heat pump is an efficient and energy-saving device that can fully utilize low-grade thermal energy. Based on the reverse Carnot cycle, it can transfer part of the heat from an external heat source (such as air, water or geothermal source) to the heated working medium water through a small amount of work. Solar energy refers to the thermal radiation energy of the sun. It is a renewable resource, which is mainly manifested as common sunlight. In modern times, solar energy is generally used to generate electricity or provide energy for water heaters, such as solar thermal collectors, solar photovoltaic power generation, and solar thermal power generation.

[0003] There is a type of heat pump-solar combined heating system that can use heat pumps and solar energy to heat working water. In actual use, solar energy is limited by many factors such as weather, seasons, and light hours. It is not stable as a heat source and the load changes frequently. Therefore, existing heating systems generally use solar energy as an auxiliary heat source and store heat through water storage tanks. However, this method cannot maximize the use of solar energy for heating. Utility Model Content

[0004] In view of the above technical problems, the purpose of the utility model is to provide a solar energy-heat pump combined heating system which can maximize the use of solar energy.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a solar energy-heat pump combined heating system, including a water supply end for the inflow of working medium water and a water outlet end for the outflow of working medium water, and also including: a water supply pump, adjacent to the downstream of the water supply end, the water supply pump having a water pump outlet; a mixing water tank, having a first water inlet, a second water inlet and a water outlet, a first water supply path is formed between the water pump outlet and the first water inlet, and a second water supply path is formed between the water pump outlet and the second water inlet; a solar water heater, arranged on the first water supply path and having a water heater inlet fluidly connected to the water pump outlet and a water heater outlet fluidly connected to the first water inlet, the first water supply path is also equipped with a first flow meter and a first thermometer adjacent to the downstream of the water heater outlet; a first regulating valve, arranged on the first water supply path to adjust the flow of working medium water flowing into the first water supply path; a heat pump unit, having a compressor, an air cooler , an expansion valve and an evaporator, the air cooler has a first branch and a second branch that can exchange heat with each other, the compressor, the first branch, the expansion valve and the evaporator are fluidly connected in sequence and form a loop for circulating refrigerant, the second branch is located on the second water supply path; the second water supply path is also provided with a second flow meter and a second thermometer adjacent to the downstream of the second branch; a second regulating valve is arranged on the second water supply path to adjust the flow of working medium water flowing into the second water supply path; and a controller, which simultaneously signals the first flow meter, the first thermometer, the first regulating valve, the second flow meter, the second thermometer and the second regulating valve, the controller being configured to adjust the opening of the first regulating valve based on the signals of the first flow meter and the first thermometer, and the controller being configured to adjust the opening of the second regulating valve and the output of the heat pump unit based on the signals of the second flow meter and the second thermometer.

[0006] In the above technical solution, preferably, the mixing water tank also has a recirculation port for the working medium water to flow out, and a reflux path is formed between the recirculation port and the second branch for the working medium water to flow from the mixing water tank into the second branch; the solar energy-heat pump combined heating system is also configured with a first solenoid valve adjacent to the downstream of the recirculation port and a recirculation pump located on the reflux path.

[0007] In the above preferred scheme, it is further preferred that the return path, the second branch and the mixing water tank form a recycling loop, and the first water supply path is also provided with a check valve, and the check valve is located upstream of the recycling loop.

[0008] In the above preferred scheme, it is further preferred that the water outlet fluid of the water heater is connected to the recirculation pump, a second solenoid valve is arranged between the water outlet of the water heater and the first water inlet of the mixing water tank, and a third solenoid valve is arranged between the water outlet of the water heater and the recirculation pump.

[0009] In the above technical solution, preferably, the solar energy-heat pump combined heating system also includes an electric water heater, and the electric water heater is arranged between the mixing water tank and the water outlet. It is also further preferred that the solar energy-heat pump combined heating system also forms a bypass for the working medium water to bypass the electric water heater, and the bypass is located downstream of the mixing water tank. It is also further preferred that the solar energy-heat pump combined heating system also includes a third thermometer adjacent to the upstream of the electric water heater, and the controller signal is connected to the third thermometer and is configured to selectively open the bypass based on the signal of the third thermometer.

[0010] Compared with the prior art, the solar energy-heat pump combined heating system provided by the technical solution of the utility model can feedback the output of the solar water heater based on the real-time signals of the first flow meter and the first thermometer on the first water supply path, and then adjust the flow rate of the working water entering the first and second water supply paths and the output of the heat pump unit, so that the output of the heat pump unit changes with the change of the solar energy load, so as to maximize the use of solar energy for heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A system diagram of the solar energy-heat pump combined heating system provided by the utility model;

[0012] Figure 2 for Figure 1 Signal connection diagram of the heating system shown.

[0013] 100. Solar energy-heat pump combined heating system; 10. Water supply end; 20. Water outlet end;

[0014] 1. Water supply pump;

[0015] 2. Solar water heater; 21. First regulating valve; 22. First flow meter; 23. First thermometer;

[0016] 31. compressor; 32. air cooler; 33. expansion valve; 34. evaporator; 35. second regulating valve; 36. second flow meter; 37. second thermometer;

[0017] 4. Mixing water tank;

[0018] 51. First solenoid valve; 52. Recirculation pump; 53. Check valve; 54. Second solenoid valve; 55. Third solenoid valve;

[0019] 6. Electric water heater; 61. Third thermometer; 62. Fourth thermometer; 63. Bypass;

[0020] 7. Controller. DETAILED DESCRIPTION

[0021] In order to explain in detail the technical content, structural features, objectives and effects of the present application, the technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0022] In this application, spatially relative terms such as "under", "below", "under", "lower", "above", "upper", "above", "higher", "side" (for example, as in "sidewall"), etc., are used to describe the relationship of one element to another (other) element as shown in the accompanying drawings. The spatially relative terms are intended to include different orientations of the device in use, operation and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, the elements described as "under" or "beneath" other elements or features will then be positioned as "above" the other elements or features. Therefore, the exemplary term "under" can include both above and below orientations. In addition, the device can be positioned otherwise (for example, rotated 90 degrees or at other orientations), so the spatially relative descriptors used herein are interpreted accordingly.

[0023] In the present application, the term "upstream" (or "downstream") means that one object is located upstream (or downstream) of another object with respect to the flow direction of water.

[0024] See also Figure 1-2 The utility model provides a solar-heat pump combined heating system (hereinafter referred to as the heating system) 100, which includes a water supply end 10 for the inflow of working medium water, a water outlet end 20 for the outflow of working medium water, a water supply pump 1 for providing flow power for the working medium water, a solar water heater 2 for heating the working medium water by using solar energy, a heat pump unit for heating the working medium water by using an external heat source, a mixing water tank 4 for storing a certain amount of working medium water, and a controller 7 as a control center. The heating system 100 can heat the working medium water to a suitable temperature based on the heat load demand of the water outlet end 20.

[0025] The water supply pump 1 is adjacent to the downstream of the water supply end 10, and has a water pump inlet (not shown in the figure) for the working medium water to flow in and a water pump outlet (not shown in the figure) for the working medium water to flow out. The mixing water tank 4 has a first water inlet (not shown in the figure) for the working medium water to flow in, a second water inlet (not shown in the figure) for the working medium water to flow in, and a water outlet (not shown in the figure) for the working medium water to flow out. The heating system 100 also includes a first water supply path (not shown in the figure) formed between the water pump outlet and the first water inlet and a second water supply path (not shown in the figure) formed between the water pump outlet and the second water inlet. It can be understood that the first and second water supply paths are in parallel.

[0026] The solar water heater 2 is arranged on the first water supply path, and has a water heater inlet for the working medium water to flow in and a water heater outlet for the working medium water to flow out. The first water supply path is also equipped with a first regulating valve 21, a first flowmeter 22 and a first thermometer 23. The water pump outlet, the first regulating valve 21 and the water heater inlet are fluidically connected in sequence, and the first regulating valve 21 can adjust the flow rate of the working medium water entering the first water supply path by adjusting its own opening. The first flowmeter 22 and the first thermometer 23 are adjacent to the downstream of the water heater outlet to monitor the flow rate and temperature of the working medium water at the downstream of the solar water heater 2 (i.e., the first water inlet of the mixing water tank 4). Among them, the first flowmeter 22, the first thermometer 23 and the first regulating valve 21 are all connected to the controller 7 by signal, and the controller 7 can adjust the opening of the first regulating valve 21 based on the signals of the first flowmeter 22 and the first thermometer 23.

[0027] The heat pump unit includes a compressor 31, an air cooler 32, an expansion valve 33 and an evaporator 34. The air cooler 32 has a first branch and a second branch for heat exchange. The compressor 31, the first branch of the air cooler 32, the expansion valve 33 and the evaporator 34 are fluidly connected in sequence and form a loop for circulating the refrigerant. The controller 7 is connected to the compressor 31 to control and adjust the output of the heat pump unit.

[0028] Among them, the compressor 31 can compress the low-temperature and low-pressure refrigerant fluid into a high-temperature and high-pressure refrigerant fluid, and provide the refrigerant fluid with power to circulate in the loop; the air cooler 32 allows the refrigerant fluid to exchange heat with the working medium water, and allows the high-temperature and high-pressure refrigerant fluid to release heat to the outside and then be converted into a low-temperature and high-pressure refrigerant fluid; the expansion valve 33 can convert the low-temperature and high-pressure refrigerant fluid into a low-temperature and low-pressure refrigerant fluid through the throttling effect; finally, the evaporator 34 allows the low-temperature and low-pressure refrigerant fluid to exchange heat with the external heat source here, and then be converted into a low-temperature and low-pressure refrigerant fluid. Therefore, through the above cycle, the refrigerant in the loop transfers part of the heat from the external heat source to the working medium water to heat the working medium water.

[0029] It should be noted that the heat pump unit can be any one of a water source heat pump unit, an air source heat pump unit and a geothermal source heat pump unit.

[0030] The second branch of the air cooler 32 is located on the second water supply path. The second water supply path is also equipped with a second regulating valve 35, a second flow meter 36 and a second thermometer 37. The water pump outlet, the second regulating valve 35 and the second branch of the air cooler 32 are fluidically connected in sequence, and the second regulating valve 35 can adjust the flow of the working medium water entering the second water supply path by adjusting its own opening. The second flow meter 36 and the second thermometer 37 are arranged on the water supply path between the second branch of the air cooler 32 and the second water inlet of the mixing water tank 4 to monitor the flow and temperature of the working medium water at the downstream of the air cooler 32 (i.e., the water inlet of the mixing water tank 4). Among them, the second flow meter 36, the second thermometer 37 and the second regulating valve 35 are all connected to the controller 7 by signal, and the controller 7 can adjust the opening of the second regulating valve 35 and the output of the heat pump unit based on the signals of the second flow meter 36 and the second thermometer 37.

[0031] In the heating system 100 provided by the utility model, the real-time output of the solar water heater 2 can be obtained based on the feedback of the first thermometer 23 and the first flowmeter 22, and then the flow rate of the working medium water entering the first water supply path (i.e., entering the solar water heater 2) can be adjusted. Thereafter, the remaining heat required by the heating system 100 is supplemented by the heat pump unit. Thus, the heating system 100 can adjust the output by the heat pump unit following the load change of the solar water heater 2, so as to maximize the use of solar energy to heat the working medium water while meeting the needs of the water outlet 20, so as to improve the overall economy and environmental protection of the heating system 100.

[0032] Here, it is explained how the heat pump unit adjusts its output in accordance with the output change of the solar water heater 2. When the heating system 100 is working, the water pump 1 can adjust its output based on the flow rate required by the water outlet 20. Thereafter, the controller 7 obtains the real-time output of the solar water heater 2 based on the feedback of the first flow meter 22 and the first thermometer 23, and then adjusts the first regulating valve 21, that is, adjusts the flow rate of the working medium water entering the first water flow path. A recommended method is a method of regulating the outlet water temperature of the solar water heater 2 while only changing the flow rate. For example, the temperature of the working medium water required by the water outlet 20 is 50°C. Considering that the temperature of the working medium water decreases along the way, the outlet water temperature of the solar water heater 2 can be set to be constant at 52°C, and then the flow rate of the working medium water entering the solar water heater 2 is adjusted based on the outlet water temperature.

[0033] After the flow rate of the solar water heater 2 is determined, the heat pump unit adjusts its own unit output based on the flow rate of the working medium water entering the second water supply path (the flow rate is the difference between the outlet flow rate of the water supply pump 1 and the flow rate of the first water supply path), so that the outlet water temperature of the second branch of the air cooler 32 reaches the corresponding level (such as 52°C relative to the example above). Finally, the working medium water of the first and second water supply paths are all collected in the mixing water tank 4.

[0034] Furthermore, in some periodically changing heat load demands (such as heating water in spring and autumn, which is generally turned on at night and turned off the next morning), the heating system 100 needs to be started and stopped periodically. When the heating system 100 is started, the temperature of the working medium water retained in the mixing water tank 4 is relatively low and cannot meet the temperature requirement of the water outlet 20. For this reason, the heating system 100 is also designed with a recirculation loop.

[0035] Specifically, a recirculation port for the working medium to flow out is also provided on the mixing water tank 4, and the heating system 100 forms a reflux path (not shown in the figure) for the working medium water to flow from the recirculation port into the second path of the air cooler 32. The first solenoid valve 51 adjacent to the downstream of the recirculation port and the recirculation pump 52 that can provide flow power for the working medium water are also configured on the loop path. Thus, the mixing water tank 4, the first solenoid valve 51, the recirculation pump 52, and the second branch of the air cooler 32 are fluidly connected in sequence to form a recirculation loop. When the heating system 100 needs to heat the working medium water in the mixing water tank 4, the first solenoid valve 51, the recirculation pump 52 and the heat pump unit can be opened to quickly increase the temperature of the working medium water in the mixing water tank 4 and the recirculation loop. Among them, the first solenoid valve 51 and the recirculation pump 52 are both signal-connected and controlled by the controller 7.

[0036] Furthermore, a check valve 53 is also arranged on the second water supply path. The check valve 53 is located between the second regulating valve 35 and the recirculation loop to prevent the working medium water in the second water supply loop from flowing back to the water supply pump 1 .

[0037] Furthermore, the water outlet fluid of the solar water heater 2 is connected to the recirculation pump 52, and the heating system 100 is also equipped with a second solenoid valve 54 located between the water outlet of the water heater and the first water inlet of the mixing water tank 4 and a third solenoid valve 55 located between the water outlet of the water heater and the recirculation pump 52, and the second and third solenoid valves are both signal-connected and controlled by the controller 7. Therefore, under some special working conditions such as weak solar energy, high requirements for working water temperature but low flow requirements, the solar water heater 2 can be connected in series with the heat pump unit by closing the second regulating valve 35 and the second solenoid valve 54 and opening the third solenoid valve 55 and the recirculation pump 52 to meet the needs of some special working conditions.

[0038] Furthermore, considering that some usage scenarios (such as aquaculture) have high requirements for the temperature control accuracy of the working medium water, the heating system is also equipped with an electric water heater 6 and a third thermometer 61. The electric water heater 6 is arranged between the mixing water tank 4 and the water outlet 20, and the third thermometer 61 is adjacent to the downstream of the electric water heater 6. The controller 7 simultaneously connects the electric water heater 6 and the third thermometer 61 by signal, so as to selectively start the electric water heater 6 based on the signal of the third thermometer 61, thereby improving the temperature control accuracy of the working medium water.

[0039] Furthermore, considering that the electric water heater 6 increases the loss of the working medium water along the way, the heating system 100 is also formed with a bypass 63 located downstream of the mixing water tank 4 and allowing the working medium water to bypass the electric water heater 6, so as to provide a fluid path with less resistance for the working medium water when the electric water heater 6 does not need to be started.

[0040] Furthermore, the heating system 100 is further provided with a fourth thermometer 62 adjacent to the downstream of the mixing water tank 4, and the controller 7 is connected to the fourth thermometer 62 by signal and is configured to selectively open the bypass or the electric water heater 6 based on the signal of the fourth thermometer 62. In this embodiment, the water circuit switching between the bypass 63 and the electric water heater 6 is realized by a pair of three-way valves, and in other embodiments, a plurality of independently controllable solenoid valves can also be used to realize the above water circuit switching.

[0041] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A solar energy-heat pump combined heating system, comprising a water supply end for the inflow of working medium water and a water outlet end for the outflow of working medium water, characterized in that: Also includes: A water supply pump, adjacent to the downstream of the water supply end, the water supply pump has a water pump outlet; A mixing water tank having a first water inlet, a second water inlet and a water outlet, a first water supply path being formed between the water pump outlet and the first water inlet, and a second water supply path being formed between the water pump outlet and the second water inlet; A solar water heater, arranged on the first water supply path and having a water heater inlet fluidly connected to the water pump outlet and a water heater outlet fluidly connected to the first water inlet, the first water supply path also being provided with a first flow meter and a first thermometer adjacent to the downstream of the water heater outlet; a first regulating valve, arranged on the first water supply path, to regulate the flow rate of the working medium water flowing into the first water supply path; A heat pump unit, comprising a compressor, an air cooler, an expansion valve and an evaporator, wherein the air cooler comprises a first branch and a second branch capable of exchanging heat with each other, the compressor, the first branch, the expansion valve and the evaporator are fluidly connected in sequence and form a loop for circulating refrigerant, the second branch is located on the second water supply path; the second water supply path is further provided with a second flow meter and a second thermometer adjacent to the downstream of the second branch; a second regulating valve, arranged on the second water supply path, to regulate the flow rate of the working medium water flowing into the second water supply path; as well as The controller is configured to simultaneously signal-connect the first flow meter, the first thermometer, the first regulating valve, the second flow meter, the second thermometer and the second regulating valve. The controller is configured to adjust the opening of the first regulating valve based on the signals of the first flow meter and the first thermometer. The controller is configured to adjust the opening of the second regulating valve and the output of the heat pump unit based on the signals of the second flow meter and the second thermometer.

2. The solar energy-heat pump combined heating system according to claim 1, characterized in that: The mixing water tank also has a recirculation port for the working medium water to flow out, and a reflux path is formed between the recirculation port and the second branch for the working medium water to flow from the mixing water tank into the second branch; the solar energy-heat pump combined heating system is also equipped with a first solenoid valve adjacent to the downstream of the recirculation port and a recirculation pump located on the reflux path.

3. The solar energy-heat pump combined heating system according to claim 2, characterized in that: The reflux path, the second branch and the mixing water tank form a recirculation loop, and the first water supply path is also equipped with a check valve, which is located upstream of the recirculation loop.

4. The solar energy-heat pump combined heating system according to claim 2, characterized in that: The water outlet fluid of the water heater is connected to the recirculation pump, a second solenoid valve is arranged between the water outlet of the water heater and the first water inlet of the mixing water tank, and a third solenoid valve is arranged between the water outlet of the water heater and the recirculation pump.

5. The solar energy-heat pump combined heating system according to claim 1, characterized in that: It also includes an electric water heater, which is arranged between the mixing water tank and the water outlet.

6. The solar energy-heat pump combined heating system according to claim 5, characterized in that: A bypass is also formed for the working medium water to bypass the electric water heater, and the bypass is located downstream of the mixing water tank.

7. The solar energy-heat pump combined heating system according to claim 6, characterized in that: The electric water heater further comprises a third thermometer adjacent to the upstream of the electric water heater, wherein the controller is signal-connected to the third thermometer and is configured to selectively open the bypass based on a signal from the third thermometer.

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