Water source heat pump system for recycling waste heat of waste water and assisting solar water heater in heating

Abstract

The utility model relates to the technical field of solar water heaters, in particular to a water source heat pump system for recovering waste heat of waste water and assisting the solar water heater in heating. The utility model relates to a solar water heater which comprises a heat storage water tank, an energy storage water tank, a waste water collecting tank and a solar heat collecting plate which is connected with the heat storage water tank and used for heating water in the heat storage water tank. A water source heat pump unit assembly for converting heat energy is arranged between the energy storage water tank and the heat storage water tank. The water source heat pump unit assembly comprises an evaporator arranged in the energy storage water tank, a condenser connected with the evaporator in a mutual circulation mode, a heat exchanger connected with the condenser in a mutual circulation mode and partially arranged in the heat storage water tank, and a compressor and a throttling valve which are arranged between the evaporator and the condenser. The utility model has the beneficial effects that the water source heat pump is used for auxiliary heating, and the central controller is used for controlling the liquid level and the temperature in the heat storage water tank, so that a user can use hot water stably and uninterruptedly.

Description

Technical Field

[0001] The utility model relates to the technical field of solar water heaters, in particular to a water source heat pump system that recovers waste heat from waste water and assists solar water heaters in heating. Background Art

[0002] Solar energy is a renewable, clean energy source. With fossil fuels dwindling and environmental pollution becoming increasingly severe, it has become an indispensable energy source for people. In daily life, people use solar water heaters to heat water at room temperature through the principle of photothermal conversion. Compared to other methods of producing domestic hot water, solar water heaters are highly energy-efficient and power-saving.

[0003] However, due to the instability of solar radiation, solar water heaters cannot guarantee hot water at all times. On rainy days, at night, and in winter, when sunlight is reduced or absent, the hot water produced is too cold to be used properly. Furthermore, once the stored hot water in a solar water heater is used up, it is difficult to generate hot water immediately. Using electric heating would take a long time, resulting in intermittent or unstable heating, high costs, and insufficient energy efficiency.

[0004] In the existing technology, CN2023203684093, a waste heat recovery system for solar water heaters, the existing technology only has a system for heat energy recovery, but people's demand for hot water is increasing, but domestic wastewater with a relatively high temperature is often discharged directly into the sewer, and the large amount of heat contained therein is also wasted, which does not meet the green development needs of the current era.

[0005] Therefore, it is necessary to design a water source heat pump system that recovers waste heat from wastewater and assists solar water heaters in heating to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a water source heat pump system which recovers waste heat from waste water and assists solar water heaters in heating, so as to overcome the above-mentioned deficiencies in the current prior art.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating, comprising a heat storage tank, an energy storage water tank, a wastewater collection tank, and a solar collector plate connected to the heat storage tank and used to heat water in the heat storage tank. The system is characterized in that a water source heat pump assembly for converting heat energy is arranged between the energy storage water tank and the heat storage tank, and the water source heat pump assembly comprises an evaporator arranged in the energy storage water tank, a condenser cyclically connected to the evaporator, a heat exchanger cyclically connected to the condenser and partially arranged in the heat storage tank, and a compressor and a throttle valve arranged between the evaporator and the condenser.

[0009] Preferably, a water outlet is provided at the bottom of the heat storage tank, and an electric heating device is installed at the front end of the water outlet.

[0010] Preferably, a water inlet is further provided at the bottom of the heat storage tank, and a water replenishment control valve for controlling the switch is provided between the water inlet and the heat storage tank.

[0011] Preferably, temperature sensors and liquid level sensors are provided in both the hot water storage tank and the energy storage tank.

[0012] Preferably, a pipeline is provided between the energy storage water tank and the wastewater collection tank, a water pump is provided on the pipeline, and a control valve is also provided on the pipeline.

[0013] Preferably, a drain pipe is provided at the bottom of the energy storage water tank, and a drain control valve is provided on the drain pipe.

[0014] Preferably, the wastewater collection box is externally connected to a wastewater collection port, and a filter is provided between the wastewater collection port and the wastewater collection box.

[0015] Preferably, the heat storage tank, the energy storage tank and the wastewater collection tank are externally connected to a central controller.

[0016] The beneficial effects of the present invention are as follows: the present technical solution utilizes a water source heat pump for auxiliary heating, overcoming the defect that traditional solar water heaters cannot work when the sunshine conditions are reduced or absent, such as on rainy days, at night and in winter, and utilizes a central controller to control the liquid level and temperature in the heat storage tank, so that users can have stable and uninterrupted hot water use; utilizing recycled waste hot water as a water source avoids the problem of needing to install complex supporting projects after utilizing rivers, lakes or groundwater as a water source, and reduces the waste of water resources, which is more friendly to areas with scarce water resources; the present invention not only utilizes the energy of the sun and water at the same time, but also the water source heat pump technology is the cooling and heating method with the highest energy efficiency ratio in the current air-conditioning system, and utilizing the heat in the waste hot water as a heat source can further improve the energy efficiency coefficient of the unit and reduce the operating energy consumption; compared with the air source heat pump, the performance of the present invention will not change with the changes in the outdoor climate, and there is no difficult problem such as winter defrosting. The water source temperature of this system is relatively constant, and its fluctuation range is far smaller than the change of air, so the operation of the heat pump unit is reliable and stable; compared with electric water heaters, it does not have the hidden dangers of leakage and dry burning; compared with gas water heaters, it does not produce harmful gases and has no hidden dangers of gas leakage and poisoning; it operates without any pollution, does not generate waste residue, wastewater, exhaust gas and smoke, and will not produce urban heat island effect, and is very friendly to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating in the utility model;

[0018] In the figure: 1 - solar thermal collector, 2 - heat storage tank, 3 - water outlet, 4 - water inlet,

[0019] 5-heat exchanger, 6-condenser, 7-compressor, 8-throttle valve, 9-evaporator,

[0020] 10 - energy storage tank, 11 - wastewater collection port, 12 - filter, 13 - wastewater collection tank, 14 - water supply control valve, 15 - central controller, 16 - drainage control valve,

[0021] 17-water pump, 18-electric heating device, 19-temperature sensor, 20-liquid level sensor. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] Reference Figure 1 A water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating includes a water storage tank 2, an energy storage water tank 10, a wastewater collection tank 13, a solar collector 1 connected to the water storage tank and used to heat the water in the water storage tank, and a water source heat pump assembly for converting heat energy provided between the energy storage water tank 10 and the water storage tank 2;

[0025] A water outlet 3 is provided at the bottom of the heat storage tank 2; hot water is discharged from the water outlet 3. If there is no hot water but hot water is needed urgently, an electric heating device 18 is installed at the front end of the water outlet 3 to heat the water through the electric heating device 18 and then discharge it from the water outlet 3, thereby solving the problem of emergency water use. The use of a water source heat pump for auxiliary heating overcomes the defect that traditional solar water heaters cannot work under conditions of reduced or no sunlight, such as rainy days, nights and winter.

[0026] A water inlet 4 is also provided at the bottom of the hot water storage tank 2, and a water supply control valve 14 for controlling the switch is provided between the water inlet and the hot water storage tank 2. The water flows from the water inlet 4 into the hot water storage tank 2 through the control valve switch of the water supply control valve 14;

[0027] In order to effectively detect the temperature and liquid level of the water in the hot water storage tank 2 and the energy storage tank 10, a temperature sensor 19 and a liquid level sensor 20 are provided in the hot water storage tank 2 and the energy storage tank 10;

[0028] A pipeline is provided between the energy storage water tank 10 and the wastewater collection tank 13, and a water pump 17 is provided on the pipeline, and a control valve is also provided on the pipeline;

[0029] A drain pipe is provided at the bottom of the energy storage water tank 10, and a drain control valve 16 is provided on the drain pipe; the drain control valve 16 is controlled to discharge the liquid in the energy storage water tank 10;

[0030] The wastewater collection box 13 is externally connected to a wastewater collection port 11, and a filter 12 is provided between the wastewater collection port 11 and the wastewater collection box 13. When the user uses hot water, the used wastewater is led to the wastewater collection port 11, filtered by the filter 12 to remove impurities in the water, and then stored in the wastewater collection box 13 to provide heat source for the water source heat pump.

[0031] The hot water storage tank 2, the energy storage tank 10 and the wastewater collection tank 13 are externally connected to a central controller 15, and the temperature sensor 19, the liquid level sensor 20, the water supply control valve 14, the control valve and the drainage control valve 16 are all connected to the central controller 15 and controlled by the central controller 15;

[0032] The water source heat pump assembly includes an evaporator 9 disposed in the energy storage water tank 10, a condenser 6 in a loop with the evaporator 9, a heat exchanger 5 in a loop with the condenser 6 and partially disposed within the heat storage tank 2, and a compressor 7 and a throttle valve 8 disposed between the evaporator and the condenser 6. The evaporator 9 of the water source heat pump unit is placed in the energy storage water tank 10. The liquid refrigerant in the unit absorbs heat from the water in the evaporator 9 and evaporates into a low-temperature, low-pressure gaseous refrigerant. It is then compressed by the compressor 7 into a high-temperature, high-pressure gaseous refrigerant and fed into the condenser 6. In the condenser 6, the high-temperature, high-pressure gaseous refrigerant transfers heat to the water in the heat storage tank 2 via the heat exchanger 5. The refrigerant then condenses into a liquid and returns to the evaporator 9, repeating the heat absorption and heat exchange process.

[0033] In this implementation case, when there is sufficient sunshine, the water in the heat storage tank is heated by the solar thermal collector, and the hot water is discharged from the water outlet, and tap water enters from the water inlet. Temperature and liquid level sensors are installed in the heat storage tank. Under the action of the central controller, when the liquid level in the heat storage tank is lower than the set value, the water supply control valve is opened to add tap water, so that the liquid level and hot water temperature in the heat storage tank are always maintained at a certain temperature. When the user uses hot water, the used wastewater is led to the wastewater collection port, filtered by the filter to remove impurities in the water, and then stored in the wastewater collection tank to provide heat source for the water source heat pump;

[0034] When there is insufficient sunshine, if it is detected that the hot water in the heat storage tank does not reach the required temperature, the water source heat pump unit will be operated. The evaporator of the water source heat pump unit is placed in the energy storage tank. The liquid refrigerant in the unit absorbs heat from the water in the evaporator and evaporates into a low-temperature, low-pressure gaseous refrigerant. It is then compressed by the compressor into a high-temperature, high-pressure gaseous refrigerant and sent to the condenser. In the condenser, the high-temperature, high-pressure gaseous refrigerant transfers heat to the water in the heat storage tank through the heat exchanger. The refrigerant condenses into liquid and returns to the evaporator, repeating the process of heat absorption and heat exchange.

[0035] The energy storage water tank is connected in series with the wastewater collection tank, and temperature and liquid level sensors are also installed in the energy storage water tank. When the heat pump is running, if the water temperature in the energy storage water tank is detected to be lower than the set value, the heat pump unit will be stopped, the drainage control valve will be opened, and the water with lower temperature will be discharged. When the liquid level in the energy storage water tank is lower than the set value, the drainage control valve will be closed, the water supply control valve will be opened, and the water in the wastewater collection tank will be transferred to the energy storage water tank through the water pump to restart the water source heat pump unit. In order to avoid the urgent need for hot water during this process, an electric heating device is installed in the heat storage tank.

[0036] The benefits of the present invention are that the present technical solution utilizes a water source heat pump for auxiliary heating, overcoming the defect that traditional solar water heaters cannot work when the sunshine conditions are reduced or absent, such as on rainy days, at night and in winter, and utilizes a central controller to control the liquid level and temperature in the heat storage tank, so that users can have stable and uninterrupted hot water use; utilizing recycled waste hot water as a water source, avoiding the problem of needing to install complex supporting projects after utilizing rivers, lakes or groundwater as a water source, and reducing the waste of water resources, making it more friendly to areas with scarce water resources; the present invention not only utilizes the energy of the sun and water at the same time, but also the water source heat pump technology is the most energy-efficient cooling and heating method in the current air-conditioning system, and utilizing the heat in the waste hot water as a heat source can further improve the energy efficiency coefficient of the unit and reduce the operating energy consumption; compared with the air source heat pump, the performance of the present invention will not change with the changes in the outdoor climate, and there is no difficult problem such as winter defrosting. The water source temperature of this system is relatively constant, and its fluctuation range is far smaller than the change of air, so the operation of the heat pump unit is reliable and stable; compared with electric water heaters, it does not have the hidden dangers of leakage and dry burning; compared with gas water heaters, it does not produce harmful gases and has no hidden dangers of gas leakage and poisoning; it operates without any pollution, does not generate waste residue, wastewater, exhaust gas and smoke, and will not produce urban heat island effect, and is very friendly to the environment.

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A water source heat pump system that recovers waste heat from wastewater and assists solar water heater heating, comprising a heat storage tank, an energy storage tank, a wastewater collection tank, and a solar collector connected to the heat storage tank for heating water in the heat storage tank, characterized by: A water source heat pump assembly for converting heat energy is arranged between the energy storage water and the hot water storage tank. The water source heat pump assembly includes an evaporator arranged in the energy storage water tank, a condenser circulated with the evaporator, a heat exchanger circulated with the condenser and partially placed in the hot water storage tank, and a compressor and a throttle valve placed between the evaporator and the condenser.

2. The water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating according to claim 1, characterized in that: A water outlet is provided at the bottom of the heat storage tank, and an electric heating device is installed at the front end of the water outlet.

3. The water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating according to claim 1, characterized in that: A water inlet is also provided at the bottom of the heat storage tank, and a water supply control valve for controlling the switch is provided between the water inlet and the heat storage tank.

4. The water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating according to claim 1, characterized in that: Temperature sensors and liquid level sensors are provided in the heat storage tank and the energy storage tank.

5. The water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating according to claim 1, characterized in that: A pipeline is provided between the energy storage water tank and the wastewater collection tank, a water pump is provided on the pipeline, and a control valve is also provided on the pipeline.

6. The water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating according to claim 1, characterized in that: A drainage pipe is provided at the bottom of the energy storage water tank, and a drainage control valve is provided on the drainage pipe.

7. The water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating according to claim 1, characterized in that: The wastewater collection box is externally connected to a wastewater collection port, and a filter is provided between the wastewater collection port and the wastewater collection box.

8. The water source heat pump system for recovering waste heat from wastewater and assisting solar water heater heating according to claim 1, characterized in that: The heat storage tank, the energy storage tank and the wastewater collection tank are externally connected to a central controller.

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