Hot water supply coupling system

Abstract

The utility model discloses a hot water supply coupling system which comprises a solar water heating device, a bathing waste water waste heat recovery heat pump water heating device, a hot water supply device and a water supplementing device, and the bathing waste water waste heat recovery heat pump water heating device is connected with the solar water heating device. The water replenishing device is respectively connected with the solar water heating device, the bathing wastewater waste heat recovery heat pump water heating device and the hot water supply device, and the air energy heat pump water heating device is connected between the solar water heating device and the hot water supply device. And the water replenishing device is connected with the air energy heat pump water heating device. According to the hot water supply coupling system, light heat, waste heat and air energy can be coupled, renewable energy sources and waste heat of bathing waste water are fully utilized, the operation efficiency for preparing unit hot water is higher, the operation cost is more saved, and the hot water supply coupling system has good economic benefits and environmental protection values.

Description

Technical Field

[0001] The utility model belongs to the field of comprehensive utilization of thermal energy, and specifically relates to a hot water supply coupling system that can couple solar thermal energy, waste heat and air energy. Background Technique

[0002] Solar energy is an inexhaustible, clean and renewable energy source. Converting solar energy into heat energy through a collector to produce domestic hot water is the most common way of solar thermal utilization. Solar energy has the characteristics of intermittency, variability and uncertainty, and cannot continuously supply heat. Therefore, other auxiliary heat sources need to be set in the solar water heating system to achieve stable output of hot water.

[0003] Bathing hot water is a rigid demand in residents' daily life. The temperature of the water used in the bathroom is generally 40-45°C, and the temperature of the wastewater generated is generally up to 30-35°C. The same amount of wastewater is discharged as the hot water used. The waste heat of the wastewater discharged during bathing can be used as the heat source for a water source heat pump to produce hot water. Through the optimized design of the wastewater collection system, the wastewater collection temperature can be continuously maintained above 30°C regardless of outdoor meteorological conditions, and hot water can be efficiently and stably produced by the water source heat pump even in the case of severe cold and continuous rainy and snowy days outdoors.

[0004] In some large-scale centralized domestic hot water systems such as staff or student dormitories, bath centers, and washing factories, coupling the above-mentioned waste heat heat pump of bathing wastewater with a solar collector to supply hot water is an energy-saving, efficient and economical technical means. However, due to the spatio-temporal dislocation between the incoming water of bathing wastewater and the hot water supply in the coupling system, and the characteristics of intermittency, variability and uncertainty of solar energy, there will be a situation where the waste heat recovery is insufficient while the solar heat storage is also insufficient, resulting in insufficient hot water supply temperature or flow rate at individual times. In the prior art, a conventional energy source such as a gas boiler is usually added for heat supplement to meet the water supply demand for the whole period, and the primary energy utilization rate is relatively low. Content of the Utility Model

[0005] The purpose of the utility model is to provide a hot water supply coupling system that can couple solar thermal energy, waste heat and air energy, operates stably, and has good economic benefits and environmental protection value.

[0006] To achieve the above object, the hot water supply coupling system of the present utility model includes a solar hot water device, a waste bath water heat recovery heat pump hot water device, a hot water supply device, and a water replenishing device. The waste bath water heat recovery heat pump hot water device is connected to the solar hot water device. The water replenishing device is respectively connected to the solar hot water device, the waste bath water heat recovery heat pump hot water device, and the hot water supply device. It further includes an air source heat pump hot water device, which is connected between the solar hot water device and the hot water supply device, and the water replenishing device is connected to the air source heat pump hot water device.

[0007] In one embodiment of the above hot water supply coupling system, the air source heat pump hot water device includes an air source heat pump hot water unit, a water supply water tank, and a hot water circulation pump. The air source heat pump hot water unit is connected to the water supply water tank through the hot water circulation pump, and the water replenishing device is connected to the hot water circulation pump.

[0008] In one embodiment of the above hot water supply coupling system, the water supply water tank includes a water supply box body and a water supply box body temperature sensor and a water supply box body liquid level sensor arranged in the water supply box body.

[0009] In one embodiment of the above hot water supply coupling system, the solar hot water device includes a solar collector, a hot water storage tank, and a heat collection circulation pump. The water replenishing device is connected to the solar collector, and the heat collection circulation pump is connected between the water replenishing device and the hot water storage tank.

[0010] In one embodiment of the above hot water supply coupling system, the hot water storage tank includes a heat storage box body and a heat storage box body temperature sensor and a heat storage box body liquid level sensor arranged in the heat storage box body.

[0011] In one embodiment of the above hot water supply coupling system, the water supply box body is connected to the heat storage box body, and the height of the water supply box body is lower than the height of the heat storage box body.

[0012] In one embodiment of the above hot water supply coupling system, the waste bath water heat recovery heat pump hot water device includes a waste heat recovery heat pump hot water unit, a waste water tank, and a waste bath water circulation pump. The waste water tank is connected to the waste heat recovery heat pump hot water unit through the waste bath water circulation pump, and the water replenishing device is connected to the waste heat recovery heat pump hot water unit.

[0013] In one embodiment of the above hot water supply coupling system, the waste water tank includes a waste water box body and a waste water box body temperature sensor and a waste water box body liquid level sensor arranged in the waste water box body.

[0014] In an embodiment of the above-mentioned hot water supply coupling system, the hot water supply device includes a hot water supply pump, a constant pressure tank, and a solenoid valve. The hot water supply pump and the constant pressure tank are connected to a hot water supply pipeline connected to the water supply tank, and the solenoid valve is connected to a hot water return pipeline connected to the water supply tank.

[0015] In an embodiment of the above-mentioned hot water supply coupling system, the water replenishing device includes a main pipeline and a plurality of branch pipelines connected to the main pipeline. A backflow preventer and a pressure sensor are provided on the main pipeline, and the branch pipelines are respectively connected to a solar hot water device, a bath waste heat recovery heat pump hot water device, a hot water supply device, and an air source heat pump hot water device.

[0016] The beneficial effect of the present utility model is that the hot water supply coupling system of the present utility model makes full use of renewable energy and the waste heat of bath wastewater, has a higher operating efficiency for producing unit hot water, and saves more operating costs.

[0017] The following describes the present utility model in detail with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present utility model. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of module connection of the hot water supply coupling system of the present utility model;

[0019] Figure 2 It is a schematic structural connection diagram of the hot water supply coupling system of the present utility model.

[0020] Among them, reference numerals

[0021] 1 - solar collector; 2 - waste heat recovery heat pump water heater; 2-1 evaporator; 2-2 compressor; 2-3 condenser; 2-4 throttle valve; 3 - air source heat pump water heater; 3-1 compressor; 3-2 condenser; 3-3 throttle valve; 3-4 evaporator; 4 - hot water storage tank; 5 - waste water tank; 6 - water supply tank; 7 - backflow preventer; 8 - electric valve; 9 - heat collection circulation pump; 10 - liquid level sensor of heat storage box body; 11 - bath waste water circulation pump; 12 - electric valve; 13 - liquid level sensor of waste water box body; 14 - electric valve; 15 - hot water circulation pump; 16 - liquid level sensor of water supply box body; 17 - electric valve; 18 - electric valve; 19 - hot water supply pump; 20 - constant pressure tank; 21 - solenoid valve; 22 - main pipeline pressure sensor; 23 - water supply pipeline pressure sensor; 24 - collector temperature sensor; 25 - hot water storage tank temperature sensor; 26 - waste water box body temperature sensor; 27 - water supply box body temperature sensor; 28 - return pipeline temperature sensor; 100 - solar hot water device; 200 - bath waste heat recovery heat pump hot water device; 300 - hot water supply device; 400 - water replenishing device; 500 - air source heat pump hot water device. Detailed implementation manners

[0022] The technical solution of the present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to further understand the purpose, solution and efficacy of the present utility model, but it is not intended to limit the protection scope of the appended claims of the present utility model.

[0023] References to "embodiment", "another embodiment", "this embodiment", etc. in the specification mean that the described embodiment may include specific features, structures or characteristics, but not every embodiment must include these specific features, structures or characteristics. In addition, such expressions do not refer to the same embodiment. Further, when combining specific features, structures or characteristics in an embodiment, it has been shown that it is within the knowledge of those skilled in the art to combine such features, structures or characteristics into other embodiments, whether or not explicitly described.

[0024] In the specification and subsequent claims, certain terms are used to refer to specific components or parts. Those of ordinary skill in the art should understand that a technical user or manufacturer may use different nouns or terms to refer to the same component or part. The specification and subsequent claims do not use the difference in name as a way to distinguish components or parts, but use the difference in function of components or parts as the criterion for distinction. The terms "comprising" and "including" mentioned throughout the specification and subsequent claims are open-ended terms, so they should be interpreted as "including but not limited to". In addition, the term "connected" herein includes any direct and indirect connection means.

[0025] It should be noted that in the description of the present utility model, terms such as "horizontal", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present utility model. For the convenience of clear description, the ordinal terms such as "first", "second", "third", "fourth", etc. mentioned in this article are used to distinguish elements, regions, parts from another identical or similar element, region, part, rather than to limit specific elements, regions, parts.

[0026] Such as Figure 1 And Figure 2As shown in the figure, the hot water supply coupling system of the present utility model includes a solar water heating device 100, a bath wastewater waste heat recovery heat pump water heating device 200, a hot water supply device 300, a water replenishing device 400, and an air source heat pump water heating device 500. Among them, the bath wastewater waste heat recovery heat pump water heating device 200 is connected to the solar water heating device 100, the air source heat pump water heating device 500 is connected between the solar water heating device 100 and the hot water supply device 300, and the water replenishing device 400 is respectively connected to the solar water heating device 100, the bath wastewater waste heat recovery heat pump water heating device 200, the hot water supply device 300, and the air source heat pump water heating device 500.

[0027] In the present utility model, the solar water heating device 100 and the bath wastewater waste heat recovery heat pump water heating device 200 are in a parallel relationship and are connected to a hot water storage tank. The air source heat pump water heating device 500 is connected to a water supply tank. The hot water storage tank and the water supply tank are in a series relationship, which will be described in detail below.

[0028] The present utility model couples an air source heat pump with solar thermal energy and a bath wastewater waste heat heat pump. First, the solar water heating device 100 is used to utilize solar energy to produce domestic hot water. When solar energy is insufficient, the bath wastewater waste heat recovery heat pump water heating device 200 is used to supplement the heat by utilizing the waste heat of bath wastewater. If there is still a shortage, the air source heat pump water heating device 500 is used to make up the deficiency by utilizing the air source heat pump. By making full use of renewable energy and the waste heat of bath wastewater, this system has higher operating efficiency and more savings in operating costs for producing unit hot water compared with a single air source heat pump hot water system and a gas boiler hot water system, and has good economic benefits and environmental protection value.

[0029] Among them, the air source heat pump, through the reverse Carnot cycle, uses a small amount of electric energy as the driving force to continuously absorb the low-grade heat energy in the air that is difficult to utilize, converts it into available high-grade heat energy, realizes the transfer of low-temperature heat energy to high-temperature heat energy, and then releases the high-grade heat energy into the water to produce domestic hot water. It is an efficient and low-carbon hot water supply system.

[0030] In an embodiment of the present utility model, the solar water heating device 100 includes a solar collector 1, a hot water storage tank 4, and a heat collection circulation pump 9. The water replenishing device 400 includes a main pipeline and a plurality of branch pipelines connected to the main pipeline. The branch pipelines include a first branch pipeline connected to the solar water heating device 100. Among them, the first branch pipeline is connected to the solar collector 1, and the heat collection circulation pump 9 is connected between the first branch pipeline and the hot water storage tank 4. The hot water storage tank 4 includes a hot water storage box body and a hot water storage box body temperature sensor and a hot water storage box body liquid level sensor arranged in the hot water storage box body.

[0031] Specifically, the solar collector 1 is a heat exchange component with a cold water flow channel provided inside a peripherally selective absorption coating. The cold water flow channel is connected between the first inlet / outlet and the second inlet / outlet of the solar collector 1; the first inlet / outlet of the solar collector 1 is connected to the first pipeline and the heat collection circulation pump 9; the second inlet / outlet of the solar collector 1 is connected to the second inlet / outlet of the hot water storage tank 4; a collector temperature sensor 24 is provided at the second inlet / outlet of the solar collector 1, and the detected value is denoted as T1. T1 is used as a control quantity to control the operation mode of the entire device.

[0032] The hot water storage tank 4 is a heat-insulated water tank. The first inlet / outlet of the hot water storage tank 4 is connected to the heat collection circulation pump 9; the second inlet / outlet of the hot water storage tank 4 is connected to the second inlet / outlet of the solar collector 1; a hot water storage tank temperature sensor 25 is provided inside the hot water storage tank 4, and the detected value is denoted as T2; a hot water storage tank body liquid level sensor 10 is provided inside the hot water storage tank 4, the high water level detection value is denoted as h1, and the low water level detection value is denoted as h2; T2, h1, and h2 are used as control quantities to control the operation mode of the entire device.

[0033] The inlet end of the heat collection circulation pump 9 is connected to the first inlet / outlet of the hot water storage tank 4; the outlet end of the heat collection circulation pump 9 is connected to the first inlet / outlet of the solar collector 1 and the first pipeline.

[0034] An electric valve 8 is provided on the first pipeline, which is connected to the first inlet / outlet of the solar collector 1 and the outlet end of the heat collection circulation pump 9.

[0035] The bath wastewater waste heat recovery heat pump water heating device 200 includes a waste heat recovery heat pump water heating unit 2, a wastewater tank 5, and a bath wastewater circulation pump 11. The pipeline of the water supply device 400 includes a second pipeline connecting the bath wastewater waste heat recovery heat pump water heating device 200. Among them, the wastewater tank 5 is connected to the waste heat recovery heat pump water heating unit 2 through the bath wastewater circulation pump 11, and the second pipeline is connected to the waste heat recovery heat pump water heating unit 2. The wastewater tank 5 includes a wastewater box body and a wastewater box body temperature sensor and a wastewater box body liquid level sensor provided inside the wastewater tank.

[0036] Specifically, the waste heat recovery heat pump water heating unit 2 includes an evaporator 2-1, a compressor 2-2, a condenser 2-3, and a throttle valve 2-4; there are 2 passages inside both the evaporator 2-1 and the condenser 2-3; the first passage of the evaporator 2-1, the compressor 2-2, the first passage of the condenser 2-3, and the throttle valve 2-4 are sequentially connected into a loop. The second passage of the evaporator 2-1 is connected to the outlet of the bath wastewater circulation pump 11 and the bath wastewater drainage water pipe through a pipeline, and the second passage of the condenser 2-3 is connected to the second water supply pipeline and the third inlet / outlet of the hot water storage tank 4;

[0037] The waste water tank 5 is a heat-insulated water tank, which has the functions of filtering impurities in shower waste water and sewage discharge. The first inlet and outlet of the waste water tank 5 is connected to the incoming water pipe of the bath waste water, and the second inlet and outlet of the waste water tank 5 is connected to the inlet of the bath waste water circulation pump 11; a waste water tank body temperature sensor 26 is provided in the waste water tank 5, and its detected value is denoted as T3; a waste water tank body liquid level sensor 13 is provided in the waste water tank 5, its high water level detection value is denoted as h3, and its low water level detection value is denoted as h4; T3, h3, and h4 are used as control variables to control the operation mode of the entire device.

[0038] The inlet end of the bath waste water circulation pump 11 is connected to the second inlet and outlet of the waste water tank 5; the outlet end of the bath waste water circulation pump 11 is connected to the second passage of the evaporator 2-1 of the waste heat recovery heat pump water heater 2.

[0039] The second pipeline is provided with an electric valve 12, which is connected to the second passage of the condenser 2-3 of the waste heat recovery heat pump water heater 2.

[0040] The air source heat pump water heating device 500 includes an air source heat pump water heater unit 3, a water supply tank 6, and a hot water circulation pump 15. The branch pipeline of the water replenishing device 400 includes a third pipeline connecting the air source heat pump water heating device 500. Among them, the air source heat pump water heater unit 3 is connected to the water supply tank 6 through the hot water circulation pump 15, and the third pipeline is connected to the hot water circulation pump 15. The water supply tank 6 includes a water supply tank body and a water supply tank body temperature sensor and a water supply tank body liquid level sensor provided in the water supply tank.

[0041] Specifically, the air source heat pump water heater unit 3 includes an evaporator 3-4, a compressor 3-1, a condenser 3-2, and a throttle valve 3-3; there are 2 passages inside both the evaporator 3-4 and the condenser 3-2; the first passage of the evaporator 3-4, the compressor 3-1, the first passage of the condenser 3-2, and the throttle valve 3-3 are connected in sequence to form a loop. The second passage of the evaporator 3-4 drives air circulation through the equipment's own fan to absorb air energy, and the second passage of the condenser 3-2 is connected to the third water replenishing pipeline, the outlet of the hot water pump 15, and the first inlet and outlet of the water supply tank 6.

[0042] The water supply tank 6 is a heat-insulated water tank. The first inlet and outlet of the water supply tank 6 is connected to the second passage of the condenser 3-2 of the air source heat pump water heater unit 3. The second inlet and outlet of the water supply tank 6 is connected to the inlet of the hot water circulation pump 15. The third inlet and outlet of the water supply tank 6 is connected to the fourth inlet and outlet of the hot water storage tank 4; a water supply tank body temperature sensor 27 is provided in the hot water tank 6, and its detected value is denoted as T4; a water supply tank body liquid level sensor 16 is provided in the hot water tank 6, its high water level detection value is denoted as h5, and its low water level detection value is denoted as h6; T4, h5, and h6 are used as control variables to control the operation mode of the entire device.

[0043] The inlet end of the hot water circulation pump 15 is connected to the second inlet and outlet of the water supply tank 6, and the outlet end of the hot water circulation pump 15 is connected to the second passage of the condenser 3-2 of the air source heat pump water heater 3 and the third water supply pipeline.

[0044] The third pipeline is provided with an electric valve 14 and is connected to the second passage of the condenser 3-2 of the air source heat pump water heater 3 and the outlet end of the hot water circulation pump 15.

[0045] The hot water supply device 300 includes a hot water supply pump 19, a constant pressure tank 20 and a solenoid valve 21. The branch pipeline of the water replenishing device 400 includes a fourth pipeline connecting the hot water supply device 300. Among them, the hot water supply pump 19 and the constant pressure tank 20 are connected to the hot water supply pipeline connected to the water supply tank 6, and the solenoid valve 21 is connected to the hot water return pipeline connected to the water supply tank 6. The fourth pipeline is connected to the hot water supply device 300 through the water supply tank 6.

[0046] Specifically, the hot water supply pump 19 is a variable frequency speed regulating water pump; the inlet end of the hot water supply pump 19 is connected to the fourth inlet and outlet of the water supply tank 6, and the outlet end of the hot water supply pump 19 is connected to the hot water supply pipeline; a constant pressure tank 20 and a water supply pipeline pressure sensor 23 are arranged on the hot water supply pipeline, and the detected value of the water supply pipeline pressure sensor 23 is denoted as P2; the hot water return pipeline is connected to the fifth inlet and outlet of the water supply tank 6, and a solenoid valve 21 and a return pipeline temperature sensor 28 are arranged on the hot water return pipeline, and the detected value of the return pipeline temperature sensor 28 is denoted as T5; P2 and T5 are used as control quantities to control the operation mode of the whole device.

[0047] The fourth pipeline is provided with an electric valve 18 and is connected to the sixth inlet and outlet of the water supply tank 6.

[0048] Further, the fourth inlet and outlet of the hot water storage tank 4 are connected to the third inlet and outlet of the water supply tank 6 through a pipeline, and an electric valve 17 is arranged on the connecting pipeline. The water supply box body of the water supply tank 6 is connected to the heat storage box body of the hot water storage tank 4, and the height of the water supply box body 6 is lower than the height of the heat storage box body 4. Further, the bottom elevation of the hot water storage tank 4 is higher than the top elevation of the water supply tank 6, and the water in the hot water storage tank 4 can flow into the water supply tank 6 by gravity.

[0049] The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are arranged in parallel, and the total pipeline upstream is connected to the municipal cold water supply. A backflow preventer 7 and a total pipeline pressure sensor 22 are arranged on the total pipeline, and the detected value of the total pipeline pressure sensor 22 is denoted as P1; P1 is used as a control quantity to control the operation mode of the whole device.

[0050] The above-mentioned hot water supply coupling system supplies hot water through a control method that couples solar thermal energy, waste heat, and air energy, including solar water heating device control, bath wastewater waste heat recovery heat pump water heating device control, air energy heat pump water heating device control, and hot water supply device control.

[0051] In an embodiment of the present invention, for the control method of the solar water heating device, a constant temperature water discharge plus temperature difference circulation method is adopted, specifically as follows:

[0052] (a) When the water level in the hot water storage tank 4 is lower than the full water level, the constant temperature water discharge method is adopted. That is, when the water level in the hot water storage tank 4 is lower than h1 and the solar water outlet temperature T1 > 50°C, the electric valve 8 is opened to supply water to the hot water storage tank 4; when T1 < 50°C or the water level is higher than h1, the electric valve 8 is closed. Under the constant temperature water discharge method, the heat collection circulation pump 9 remains closed.

[0053] (b) When the water level in the hot water storage tank 4 is higher than the full water level, the temperature difference circulation method is adopted. That is, when the water level in the hot water storage tank 4 is higher than h1 and the difference between the solar water outlet temperature and the hot water storage tank water temperature T1 - T2 > 5°C, the heat collection circulation pump 9 is opened; when T1 - T2 < 3°C, the heat collection circulation pump 9 is closed. Under the temperature difference circulation method, when the solar water outlet temperature T1 < 60°C, the electric valve 8 remains closed; when T1 > 60°C, the electric valve 8 is opened to inject cold water to prevent the solar water supply device from overheating.

[0054] For the control method of the bath wastewater waste heat recovery heat pump water heating device, a constant temperature water discharge method is adopted, specifically as follows:

[0055] (a) An automatic control method is adopted: when the water level in the wastewater tank 5 is higher than h3 and the water level in the hot water storage tank 4 is lower than h2, the bath wastewater circulation pump 11, the electric valve 12, and the waste heat recovery heat pump water heating unit 2 are sequentially turned on to produce hot water at 50°C and inject it into the hot water storage tank 4; when the water level in the wastewater tank 5 is lower than h4 or the water level in the hot water storage tank 4 is higher than h2, the waste heat recovery heat pump water heating unit 2, the electric valve 12, and the bath wastewater circulation pump 11 are sequentially turned off.

[0056] (b) A manual control device for opening and closing the waste heat recovery heat pump water heating device should be set.

[0057] For the control method of the air energy heat pump water heating device, a one-time heating plus circulating heating method is adopted, specifically as follows:

[0058] (a) When the water level in the water supply tank 6 is lower than the set minimum water level, the one-time heating method is adopted. That is, when the water level in the water supply tank 6 is lower than h6, the electric valve 14 and the air energy heat pump water heating unit 3 are sequentially turned on to produce hot water at 50°C and inject it into the water supply tank 6; when the water level in the water supply tank 6 is higher than h6 + 0.10 m, the air energy heat pump water heating unit 3 and the electric valve 14 are sequentially turned off. Under the one-time heating method, the hot water circulation pump 15 remains closed.

[0059] (b) When the water temperature of the water supply tank 6 is lower than the set minimum water temperature, the circulating heating method is adopted. That is, when the water temperature T4 of the water supply tank 6 is less than 45 °C, the hot water circulation pump 15 and the air source heat pump water heater 3 are turned on in sequence for circulating heating to increase the water temperature of the water supply tank 6; when the water temperature of the water tank T4 is greater than 50 °C, the air source heat pump water heater 3 and the hot water circulation pump 15 are turned off in sequence. The electric valve 14 remains closed under the circulating heating method.

[0060] (c) A manual control device for opening and closing the air source heat pump water heating device should be set.

[0061] For the control method of the hot water supply device, the constant water supply pressure and temperature control method is adopted, specifically as follows:

[0062] (a) When the water level of the water supply tank 6 is lower than the set maximum water level h5, the electric valve 17 is opened to fill the water supply tank 6 with the hot water in the hot water storage tank 4 by gravity; when the water level of the water supply tank 6 is higher than the set maximum water level h5, the electric valve 17 is closed.

[0063] (b) When the water temperature T4 of the water supply tank 6 is greater than 50 °C, the electric valve 18 is opened to inject cold water for cooling; when the water temperature T4 of the water supply tank 6 is less than 50 °C, the electric valve 18 is closed.

[0064] (c) When the hot water supply pressure P2 is lower than the set lower limit value, the hot water supply pump 19 is started to boost the pressure; when the hot water supply pressure P2 is higher than the set upper limit value, the hot water supply pump 19 is closed.

[0065] (d) When the hot water return temperature T5 is less than 45 °C, the solenoid valve 21 is opened, and the domestic hot water return water is injected into the water supply tank 6.

[0066] In an experimental research project of the present utility model, a hot water supply coupling system integrating solar thermal, waste heat and air source energy is installed in the student dormitory of a certain university in Beijing. The number of people using water in the hot water supply device of the student dormitory is 2,440, and the daily water consumption is 85.40 m 3 ; the daily water use hours are 12 h, the average hourly variation coefficient is 3.20, and the maximum hourly water consumption is 22.77 m 3 ; considering the reduction of water consumption during winter and summer vacations, the total annual water supply of this project is 26,500 m 3 . The area of the solar collector is set to 440.00 m 2 , and the average heat collection efficiency of the collector is 42%. The maximum heating load of the waste heat recovery heat pump water heating device is 578 kW; the maximum heating load of the air source heat pump water heating device is 482 kW; the effective volume of the hot water storage tank is 30.00 m 3 , and the designed hot water storage temperature is 60 °C; the effective volume of the lowest water level of the hot water storage tank is 10.00 m 3; The effective volume of the water supply tank is 30.00 m 3 , and the designed hot water supply temperature is 50 °C; the effective volume of the lowest water level in the water supply tank is 25.00 m 3 .

[0067] The annual operation of the domestic hot water system of this project is expected as follows:

[0068] The total heat supply of the solar water supply device is 267,600 kWh, accounting for 21.7% of the total heat supply of the system; the total waste heat of the solar water supply device is 4,800 kWh, accounting for 1.8% of the total heat collection of the system; the total power consumption of the solar water supply device is 3,400 kWh, and the unit water volume power consumption is 0.13 kWh / m 3 ; the total electricity cost of the solar water supply device is 0.19 million yuan, and the unit water volume electricity cost is 0.07 yuan / m 3 ;

[0069] The total heat supply of the waste heat recovery heat pump water heater is 657,000 kWh, accounting for 53.3% of the total heat supply of the system; the total un-recovered heat of the waste heat recovery heat pump water heater is 15,400 kWh, accounting for 2.3% of the total recoverable heat of the system; the total power consumption of the waste heat recovery heat pump water heater is 126,800 kWh, and the unit water volume power consumption is 4.78 kWh / m 3 ; the total electricity cost of the waste heat recovery heat pump water heater is 69,800 yuan, and the unit water volume electricity cost is 2.63 yuan / m 3 ;

[0070] The total heat supply of the air source heat pump water heater is 308,100 kWh, accounting for 25.0% of the total heat supply of the system; the total power consumption of the air source heat pump water heater is 89,000 kWh, and the unit water volume power consumption is 3.36 kWh / m³; the total electricity cost of the air source heat pump water heater is 48,900 yuan, and the unit water volume electricity cost is 1.85 yuan / m 3 ;

[0071] The total water supply of the hot water supply device is 26,500 m 3 , equivalent to 10.86 m 3 / person; the total heat supply of the hot water supply device is 1,232,700 kWh, and the unit water volume energy consumption is 46.5 kWh / m 3 ; the total power consumption of the hot water supply device is 219,200 kWh, and the unit water volume power consumption is 8.3 kWh / m 3 ; the total electricity cost of the hot water supply device is 120,600 yuan, and the unit water volume electricity cost is 4.5 yuan / m 3 ; the total carbon emission of the system is 132.40 t CO2, and the unit hot water carbon emission is 5.00 kg CO2 / m 3 .

[0072] If the scheme of using a gas boiler to produce domestic hot water is adopted, 134,000 m 3 of natural gas is required. The price of natural gas is calculated at 2.87 yuan / m 3 . The total annual cost of producing domestic hot water is 384,500 yuan, and the unit hot water cost is 14.51 yuan / m 3 ; the carbon emission is 264.78 t CO2, and the unit hot water carbon emission is 9.99 kg CO2 / m 3 .

[0073] According to the above analysis, compared with the scheme of using a gas boiler to produce domestic hot water, using the present utility model to produce 1 m³ of domestic hot water can save 10.01 yuan in cost, the cost-saving percentage is 68.9%, reduce carbon emissions by about 4.99 kg CO2, and the emission reduction percentage is 49.9%; the total annual cost can be saved by 263,900 yuan, and carbon emissions can be reduced by about 132.38 t CO2. The above data fully illustrate that the present utility model has good economic benefits and environmental protection value.

[0074] Compared with the prior art, the present utility model has the following technical effects:

[0075] ⑴ For the problem of the dislocation in time and space between the incoming bath wastewater and the hot water supply in the coupling system, and the insufficient hot water supply temperature or flow rate in individual periods caused by the intermittency, variability and uncertainty of solar energy, the present utility model uses an air source heat pump water heater to supplement heat, meeting the requirement of hot water supply throughout the system.

[0076] ⑵ The solar energy and heat pump subsystems adopt a control method of fixed outlet water temperature, and the control method is simple and reliable; the hot water side adopts a double-tank mode of a hot water storage tank and a water supply tank, reducing the influence of the temperature fluctuation of the solar energy and heat pump outlet water on the water supply water temperature and improving the water supply quality.

[0077] ⑶ Compared with a single air source heat pump water heater and a gas boiler hot water system, the present utility model has higher operating efficiency and more savings in operating costs, and has good economic benefits and environmental protection value.

[0078] Of course, the present utility model can also have many other embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A hot water supply coupling system, comprising a solar water heater, a waste heat recovery heat pump water heater, a hot water supply device and a water replenishment device, wherein the waste heat recovery heat pump water heater is connected to the solar water heater, and the water replenishment device is respectively connected to the solar water heater, the waste heat recovery heat pump water heater and the hot water supply device, characterized in that: It also includes an air energy heat pump water heater, which is connected between the solar water heater and the hot water supply device, and the water replenishment device is connected to the air energy heat pump water heater.

2. The hot water supply coupling system according to claim 1, characterized in that: The air energy heat pump water heater comprises an air energy heat pump water heater unit, a water supply tank and a hot water circulation pump. The air energy heat pump water heater unit is connected to the water supply tank via the hot water circulation pump, and the water replenishment device is connected to the hot water circulation pump.

3. The hot water supply coupling system according to claim 2, characterized in that: The water supply tank comprises a water supply tank body, and a water supply tank body temperature sensor and a water supply tank body liquid level sensor which are arranged in the water supply tank body.

4. The hot water supply coupling system according to claim 2, characterized in that: The solar water heating device comprises a solar collector, a heat storage tank and a heat collection circulation pump. The water replenishment device is connected to the solar collector, and the heat collection circulation pump is connected between the water replenishment device and the heat storage tank.

5. The hot water supply coupling system according to claim 4, characterized in that: The hot water storage tank comprises a heat storage tank body, a heat storage tank body temperature sensor and a heat storage tank body liquid level sensor which are arranged in the heat storage tank body.

6. The hot water supply coupling system according to claim 5, characterized in that: The water supply tank comprises a water supply tank body, the water supply tank body is connected to the heat storage tank body, and the height of the water supply tank body is lower than the height of the heat storage tank body.

7. The hot water supply coupling system according to claim 1, characterized in that: The bathing wastewater waste heat recovery heat pump hot water device includes a waste heat recovery heat pump hot water unit, a wastewater tank and a bathing wastewater circulation pump. The wastewater tank is connected to the waste heat recovery heat pump hot water unit through the bathing wastewater circulation pump, and the water replenishment device is connected to the waste heat recovery heat pump hot water unit.

8. The hot water supply coupling system according to claim 7, characterized in that: The wastewater tank comprises a wastewater tank body and a wastewater tank body temperature sensor and a wastewater tank body liquid level sensor which are arranged in the wastewater tank body.

9. The hot water supply coupling system according to claim 2, characterized in that: The hot water supply device includes a hot water supply pump, a constant pressure tank and a solenoid valve. The hot water supply pump and the constant pressure tank are connected to the hot water supply pipeline connected to the water supply tank, and the solenoid valve is connected to the hot water return pipeline connected to the water supply tank.

10. The hot water supply coupling system according to any one of claims 1 to 9, characterized in that: The water replenishment device includes a main pipeline and multiple branch pipelines connected to the main pipeline. The main pipeline is provided with a backflow preventer and a pressure sensor. The branch pipelines are respectively connected to a solar water heating device, a bathing waste water waste heat recovery heat pump water heating device, a hot water supply device and an air energy heat pump water heating device.

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