Wastewater, waste gas and heat collecting water heater system

Abstract

The water heater system is characterized by comprising a water source heat pump, a double-source heat pump, a three-stage wastewater heat recovery system and a clean water four-stage direct heating system additionally provided with a humid and hot gas-clean water heat exchanger, the double-source heat pump has two functions of heating water by an independent water source and a wind source heat pump in a circulating manner, and consists of a compressor, a hot water condenser, a wind source, a water source evaporator, a four-way valve, a first throttler and a second throttler; according to the connection mode, an outlet of the compressor is divided into two paths which are connected with the hot water condenser and an air inlet of the four-way valve respectively; a liquid outlet of the hot water condenser is respectively connected with the air source and a second interface of the water source evaporator through a first throttler and a second throttler; a second interface, a third interface and a fourth interface of the four-way valve are respectively connected with the air source, a first interface of the water source evaporator and an inlet of the gas-liquid separator; second interfaces of the two evaporators are connected through a third throttler; the system is provided with four water heating modes, and hot water can be efficiently prepared in an energy-saving manner only by using double recovery heat and air energy at any air temperature and water temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration air conditioning / heat pump heating and hot water supply. Background Art

[0002] Hot water for bathing and washing dishes is a necessity for people. The demand is huge and the energy consumption is huge, accounting for 15-20% of the building energy consumption. Therefore, energy saving of domestic hot water is an important part of energy conservation and consumption reduction. At present, domestic hot water is mainly provided by electric water heaters and gas water heaters. These two types of water heaters use high-quality electricity and gas to produce low-quality bathing hot water, which is a waste of energy quality. Energy-saving water heater products include solar water heaters and heat pump water heaters. Solar water heaters are seriously affected by the weather, and water pipes often burst in winter, and it is difficult for low-rise residents in buildings over 6 stories to use them. Heat pump water heaters absorb ambient air or wastewater heat energy, saving more than 70% energy than electric water heaters, and are energy-saving products that make scientific use of energy quality. The efficiency of air-energy heat pump water heaters that use ambient air energy as a heat source is closely related to the temperature. In winter, when the temperature is low, the efficiency is very high. The rate is low; water source heat pumps require a water source; Huaian Hengxin Nuojin Technology Co., Ltd. and the applicant have cooperated to propose a three-stage water source heat pump water heater technology that utilizes the thermal energy of bathing wastewater, which can utilize the waste heat of bathing wastewater from 32°C to 4°C to produce a 1:1 ratio of hot water with the same amount of wastewater at a tap water temperature of more than 12°C; the existing technology for the thermal energy of bathing wastewater thermal cascade is: the first stage of temperature difference heat transfer and the second and third stages of water source heat pump recovery of wastewater heat; the heat recovered by temperature difference heat transfer in the first stage is 32°C-T1-△T, T1 is the tap water inlet temperature, △T is the heat transfer temperature difference of the heat exchanger, usually designed standard working conditions (water inlet temperature 15°C) △T = 6°C, when the flow rate of clean water and wastewater is 1:1, the clean water can be heated to 26°C through the clean water-wastewater heat exchanger, and the wastewater temperature drops to 21°C, and the wastewater heat recovery (26-15 = 32 -21=11℃); the heat of wastewater below 21℃ can only be used as the heat absorbed by the evaporator of the water source heat pump, and the heat pump cycle raises the temperature and then transfers heat to hot water. The limit of this part of waste heat is (21-4℃), so the limit heat that can be used for bathing wastewater is (32℃-4℃), accounting for about 68% of the limit total energy of bathing wastewater (45℃-4℃); theoretical analysis and experiments have proved that the limit recovery of wastewater heat can only meet the demand of producing equal flow of 45℃ hot water at the inlet temperature of fresh water of 12℃; simple energy balance analysis, when the tap water is 12℃ and the outlet temperature of hot water is 45 degrees, the bathing hot water needs to be heated to 33℃; and the bathing wastewater drops from 32℃ to 4℃, and can obtain a maximum of 28℃ of heat. Due to heat loss, only about 25℃ of heat can be obtained from the wastewater. The insufficient 8℃ of heat is supplemented by the input work of the compressor of the two-stage heat pump. The COP of the heat pump is about 4.0; if the tap water temperature drops to 8℃, the hot water for bathing needs to be heated to 37℃, but the water source heat pump cannot absorb more heat energy, so it cannot output more heat to heat the hot water, so it is necessary to find other auxiliary heat sources, such as geothermal source, air source, power source, etc.; geothermal water source, well drilling project is large and costly; using electric water heaters during off-peak period to supplement hot water, although the electricity bill is not expensive, it is still a waste of energy to produce low-grade hot water with high-quality electricity; and currently engineers can also think of using air source as auxiliary heat source, the technology used is to assemble a traditional single-function air source heat pump water heater on the market, which makes the system complicated and the cost increases; furthermore, air source heat pump water heaters will encounter the problem of difficult defrosting in winter, because a separate air source heat pump has no source of defrosting heat when frosting and defrosting, and the energy consumption of defrosting by the compression work of the compressor is large and the defrosting time is long; therefore, it is necessary to find a way to make bath water heaters at low temperatures in winter. The auxiliary heat source of hot water is still a challenging issue; the current bathing wastewater heat cascade utilization and recovery technology has only developed the utilization of bathing wastewater heat. When bathing, 45℃ hot water becomes 32℃ wastewater, of which 13℃ of hot water heat energy is lost, and most of it evaporates into water vapor. The latent heat enthalpy of water vapor exists in the humid air in the bathroom. The temperature of the humid air in the bathroom is about 38-40℃, and the humidity is greater than 94%. These humid air are discharged to the outside as waste gas during ventilation, and their latent heat is not utilized because no one pays attention to it; roughly calculated, 40℃ 94% humidity humid air cools down to 30℃ 55% humidity, and there is a difference of 10 grams of water vapor in 1 kg of dry air. The condensation heat of 10 grams of water vapor is enough to raise the temperature of 1 kg of water by 6℃; so it is a pity that the heat energy of bathing moisture is not utilized; recycling the heat energy of the humid hot air in the bathroom is undoubtedly a ray of hope for completely solving the energy-saving production of bathing hot water. . Summary of the invention

[0003] In order to cheaply produce domestic hot water that exceeds the demand for bathing, overcome the shortcomings of the existing air source and water source heat pump water heaters with a single heat source, and the existing bathing wastewater heat cascade utilization technology, when the tap water temperature is lower than 12°C, the demand for producing hot water for bathing cannot be met by simply relying on the recovery of bathing wastewater heat. The utility model proposes a wastewater and waste gas heat recovery water heater system, which is a bathing wastewater and waste gas heat recovery heat pump water heater unit system. It can produce bathing hot water equal to the amount of bathing wastewater without any additional auxiliary heat source, creating a new full-cycle mode of bathing wastewater waste gas heat recovery, and with the help of a dual-source heat pump with an air source heat exchanger added to the same machine, it can use the air source to produce hot water when there is no bathing wastewater exhaust gas and use the air source in combination at high temperatures to more efficiently produce domestic hot water. The equipment has low cost, superior performance and powerful functions.

[0004] The utility model of the wastewater and waste gas heat recovery water heater system is a bathing wastewater and waste gas heat recovery heat pump water heater system, including: a water source heat pump, a wastewater heat recovery system, a clean water heating system, a wastewater heat exchanger cleaning system, a signal detection and control system; its characteristics are: it also includes a dual-source heat pump, a waste gas heat recovery system;

[0005] The wastewater heat recovery system is composed of a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, a three-way valve, a water source evaporator of a dual-source heat pump, and an evaporator of a water source heat pump; the three-way valve is a one-inlet and two-outlet three-way valve, and has three interfaces, namely, the first, second, and third interfaces. The first and second interfaces are water outlet interfaces, which are respectively connected to the water inlet of the water source evaporator of the dual-source heat pump and the water inlet of the evaporator of the water source heat pump; the third interface is a water inlet interface, which is connected to the wastewater passage outlet of the clean water-wastewater heat exchanger The outlet of the water source evaporator of the dual-source heat pump is also connected to the water inlet of the evaporator of the water source heat pump; the first wastewater heat exchange path is a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, the third and first interface paths of the three-way valve, the water source evaporator of the dual-source heat pump, the evaporator of the water source heat pump, and a drain; the second wastewater heat exchange path is a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, the third and second interface paths of the three-way valve, the evaporator of the water source heat pump, and a drain;

[0006] The exhaust gas heat recovery system is a wet hot air-clean water heat exchanger with finned tubes. Clean water in the tube exchanges heat with wet hot air flowing through the bathroom outside the tube. The system is hoisted at the wet hot air exhaust outlet on the top of each bathroom. In the multi-storey bathrooms of the same unit of the building, each bathroom is hoisted with a wet hot air-clean water heat exchanger. The parallel water pipes at the inlet and outlet are called the first and second connecting water pipes, which pass through each floor and are respectively connected to the outlet of the clean water-waste water heat exchanger installed in the machine room on the ground floor and the water inlet of the hot water condenser of the water source heat pump.

[0007] The clean water heating system includes: clean water four-stage direct heating and hot water circulation heating system; the clean water four-stage direct heating system is composed of a water inlet valve, a water inlet one-way pressure relief valve, a clean water flow regulating valve or a frequency conversion pump, a clean water-waste water heat exchanger as a first-stage heater, a moist hot air-clean water heat exchanger as a second-stage heater, a water source heat pump hot water condenser as a third-stage heater, a one-way valve, a dual-source heat pump hot water condenser as a fourth-stage heater, and a hot water tank, which are connected in sequence with pipelines; the clean water four-stage direct heating system has two operating modes: four-stage heating and three-stage heating; The three-stage heating operation mode is a fresh water heating mode in which the hot water condenser of the water source heat pump in the four-stage heating mode does not participate in heat exchange; the hot water circulation heating system is: a loop formed by a hot water tank, a one-way valve, a hot water circulation pump, a hot water condenser (circulation heating) of a dual-source heat pump, and a hot water tank connected by pipes; the hot water tank has a hot water outlet main pipe, and an outlet valve is installed on the hot water outlet main pipe; there are two ways to replenish water in the hot water tank, one is to replenish water through the fresh water four-stage direct heating system, and the other is to replenish water through the second water inlet valve connected to the inlet pipe of the hot water circulation pump.

[0008] The utility model discloses a wastewater and waste gas heat-collecting water heater system, which is characterized in that: the dual-source heat pump is formed by adding an air source evaporator, a four-way valve and the first and second throttles to the fluorine path of a conventional water source heat pump water heater; the dual-source heat pump comprises: a compressor, a hot water condenser, the first and second throttles, an air source evaporator, a water source evaporator, a four-way valve, and a gas-liquid separator which also serves as a fluorine liquid storage device; the connection method is: the outlet of the compressor is divided into two paths, one path is connected to the air inlet of the hot water condenser, and the other path is connected to the first interface of the four-way valve, i.e., the air inlet; the hot water condenser The liquid outlet of the condenser is connected to the second interface of the air source evaporator and the water source evaporator respectively through the first and second throttles; the second, third and fourth interfaces of the four-way valve are marked as right, left and middle interfaces in the accompanying drawings, which are respectively connected to the first interface of the air source evaporator, the water source evaporator and the inlet of the gas-liquid separator; the second interface of the air source evaporator and the water source evaporator are interconnected by the third throttle; the connected circuit is filled with refrigerant; the air source evaporator is installed outdoors and connected to the second interface of the four-way valve and the outlet of the first throttle of the dual-source heat pump installed indoors through a connecting pipe.

[0009] The wastewater and waste gas heat-collecting water heater system of the utility model is characterized in that the fluorine circuit of the dual-source heat pump has two hot water production cycles and a defrosting cycle:

[0010] The first hot water wastewater source heat pump circulates, the compressor is running, the four-way valve is in the state of being connected in the first and second interfaces and in the third and fourth interfaces, and the fluorine circuit process is: compressor, hot water condenser, second throttle, water source evaporator, four-way valve, gas-liquid separator, compressor;

[0011] The second hot water air source heat pump circulates, the compressor is running, the four-way valve is in a state where the first and third interfaces are connected and the second and fourth interfaces are connected, and the fluorine circuit process is: compressor, hot water condenser, first throttle, air source evaporator, the second and fourth interface internal passages of the four-way valve, gas-liquid separator fluorine liquid storage, compressor;

[0012] In the third defrost cycle, the compressor is running, and the four-way valve is in a state where the first and second interfaces are connected and the third and fourth interfaces are connected. The fluorine circuit process is: compressor, the first and second interface internal passages of the four-way valve, the air source evaporator, the third throttle, the water source evaporator, the third and fourth interfaces of the four-way valve are connected, the gas-liquid separator, and the compressor.

[0013] The wastewater and waste gas heat-recovering water heater system of the utility model is characterized in that: the wastewater and waste gas heat-recovering water heater system can organize four hot water production operation modes:

[0014] The first hot water making mode operates: water source heat pump cycle, the first hot water making wastewater source heat pump cycle of the dual-source heat pump, the four-stage heating of the clean water four-stage direct heating system and the first wastewater heat exchange path mode; activation conditions: there is wastewater, and the inlet tap water temperature is lower than 15°C in winter; the water source heat pump cycle, its fluorine path process is: compressor, hot water condenser of the water source heat pump, throttle, evaporator of the water source heat pump, gas-liquid separator, compressor.

[0015] The second hot water production mode operates as follows: water source heat pump circulation, the second hot water production air source heat pump circulation of the dual-source heat pump, the four-stage heating of the fresh water four-stage direct heating system and the second waste water heat exchange path mode; activation conditions: the daily average temperature is higher than 20℃ or the temperature exceeds the water source evaporator discharge temperature of the dual-source heat pump;

[0016] The third hot water making mode, operation: the first hot water making wastewater source heat pump circulation of the dual-source heat pump, the three-stage heating of the four-stage direct heating system of clean water and the first wastewater heat exchange path mode; the water source heat pump stops running; the three-stage heating mode of the four-stage direct heating system of clean water is that when clean water flows through the four-stage direct heating system of clean water, it only passes through the three-stage heating of the clean water-wastewater heat exchanger as the first-stage heat exchanger, the humid hot air-clean water heat exchanger as the second-stage heat exchanger and the hot water condenser of the dual-source heat pump as the third-stage heat exchanger, and no water passes through the hot water condenser of the water source heat pump and no heat is exchanged; activation conditions: there is wastewater, and the inlet tap water temperature is higher than 20℃;

[0017] The fourth hot water making mode operates as follows: the second hot water making air source heat pump circulation of the dual source heat pump, the clean water circulation heating loop mode; the water source heat pump stops running; operating conditions: there is no waste water, there is water in the hot water tank, and when the water temperature of the hot water tank is lower than the set water temperature, the water in the hot water tank is circulated and heated, which is suitable for the initial installation of the equipment without bathing waste water and during the off-peak period.

[0018] The wastewater and waste gas heat-absorbing water heater system described in the utility model is characterized in that: the heat absorbed by the water source evaporator of the third defrost cycle of the dual-source heat pump and the compression work of the compressor are used to release heat in the wind source evaporator for defrosting; in defrost mode, operation: the compressor, the wastewater pump, and the hot water circulation pump are powered on and operated, and the first position of the four-way valve coil is the (③④) passage in the potential diagram; activation conditions: the wind source evaporator is severely frosted, and the temperature difference between the outdoor temperature and the wind source evaporator tube wall temperature suddenly exceeds the set value; when the temperature difference of the wind source evaporator tube wall temperature recovers to more than 8°C, it is restored to the original hot water making mode; auxiliary: the first wastewater heat exchange passage of the wastewater is in operation, the clean water direct heat passage and the hot water circulation loop are in operation, and the clean water and wastewater flow ratio is 1:1.2; the water source heat pump is in operation.

[0019] The wastewater and waste gas heat recovery water heater system described in the utility model is characterized in that: the signal detection includes: including tap water inlet temperature, outlet water temperature of clean water-waste water heat exchanger, outlet water temperature of wet hot gas-clean water heat exchanger, outlet water temperature of hot water condenser of water source heat pump, outlet water temperature of hot water condenser of dual source heat pump, water temperature of hot water tank; ambient air temperature, wind source evaporator tube wall temperature as defrost mode use signal; wastewater initial temperature, wastewater outlet water temperature of clean water-waste water heat exchanger, outlet water temperature of water source evaporator of dual source heat pump, outlet water temperature of evaporator of water source heat pump as wastewater heat recovery signal detection; humidity temperature; detections not shown in the figure include wastewater tank water level, hot water tank water level, bathroom relative humidity, and detection of clean water and wastewater flow; the control system is a control system that executes the start and stop of the compressor, outdoor fan, hot water circulation pump, and wastewater pump, as well as the flow regulation of clean water and wastewater according to the detection signal and operation mode requirements.

[0020] The wastewater and waste gas heat-absorbing water heater system described in the utility model is characterized in that: the wastewater and waste gas heat-absorbing water heater system is a multi-body connection system, the water source heat pump and the dual-source heat pump (except the air source evaporator) are installed in an integrated dual heat pump unit, and are installed together with the wastewater tank, the hot water circulation pump, the wastewater pump, and the control system in the machine room; the air source evaporator of the dual-source heat pump is independently installed outdoors the machine room; the humid hot air-clean water heat exchanger is hoisted on the ceiling of the bathroom on each floor, and is connected to the water outlet of the clean water-wastewater heat exchanger in the machine room and the water inlet of the hot water condenser of the water source heat pump through the first and second connecting water pipes; the signal detection probes of the system are installed at the required locations of the unit; the hot water tank is installed on the top floor of the building above the bathrooms.

[0021] The innovative features of this utility model mainly include:

[0022] 1. Innovation of heat recovery of waste water and waste gas from bathing: The waste water and waste gas heat recovery water heater system of the utility model is a heat pump water heater system for heat recovery of waste water and waste gas from bathing, which is characterized by: heat recovery of waste water and waste gas from bathing, which recovers two parts of heat energy lost by 45℃ bathing hot water: the heat energy from 45℃ to 32℃ is lost in the hot and humid air in the bathroom, accounting for about 1 / 3 of the heat energy between 45℃ and 4℃ of bathing hot water, and the other part of the heat energy in the waste water, the heat energy from 32℃ to 4℃ accounts for about 2 / 3, which is recovered in all directions, making up for the problem of insufficient heat in the waste water source when the tap water temperature is lower than 12℃; the specific technology is: using the hot and humid air-clean water heat exchanger hoisted on the top of each bathroom, the two parts of waste heat of the hot and humid air: the sensible heat and relative humidity of the hot and humid air at 38-39℃ The latent heat of water vapor with a temperature of more than 90% is directly transferred to clean water through temperature difference heat exchange. Even if there is only 1 / 3 recovery rate, the heat of clean water with a temperature rise of more than 4°C can be recovered, which is extremely precious. For wastewater heat recovery, a three-stage cascade heat recovery technology is adopted. The first stage is to transfer the wastewater heat to clean water through the temperature difference between wastewater and clean water in the clean water-wastewater heat exchanger. The second and third stages are respectively in the water source evaporator of the dual-source heat pump and the water source heat pump. The heat energy of the wastewater is first transferred to the refrigerant of the two-stage heat pump, and then through the two-stage heat pump cycle, in the hot water condenser of the two-stage heat pump, the heat of the high-temperature refrigerant is transferred to clean water step by step. The power consumption of the compressor of the two-stage heat pump compensates for the irreversible loss of heat transfer temperature difference of each heat exchanger in the heat recovery process and other heat losses that are not fully recovered.

[0023] 2. Innovation of the process of the four-stage direct heating system for clean water: The four-stage direct heating system for clean water designed by the utility model can collect both the heat of the waste water and the waste gas. Its process arrangement fully considers the water temperature of the waste water source, the hot and humid air source, the water source heat pump and the condenser of the dual-source heat pump. Under the condition of the smallest possible "fire use" loss, the four-stage heating mode of the four-stage direct heating system for clean water is scientifically organized. The process is: clean water-waste water heat exchanger (temperature difference heat transfer, first-stage heating, the highest temperature of the waste water source is 32℃, and the clean water inlet temperature is 8-2 2℃), moist hot air-fresh water heat exchanger (temperature difference heat transfer, secondary heating, moist hot air temperature 38-40℃, relative humidity>90%, fresh water temperature between 22-27℃), hot water condenser of water source heat pump (heat pump three-stage heating, condenser condensing temperature in the range of 40-45℃, fresh water temperature between 27-36℃), hot water condenser of dual-source heat pump (heat pump four-stage heating, condenser condensing temperature in the range of 50-55℃, fresh water temperature between 36-45℃).

[0024] 3. Structural innovation of the integrated wind-water dual-source heat pump: The dual-source heat pump described in the utility model is a dual-source heat pump water heater with wind-water dual-source separate cycles. The specific features are: on the basis of the fluorine circuit of the water source heat pump water heater, an air source evaporator, a four-way valve and the first and second throttles are added. In the fluorine circuit system of a compressor, the first and second hot water heat pump cycles consisting of the hot water condenser of the dual-source heat pump and its water source evaporator and wind source evaporator are formed; the advantages are: (1) The second hot water air source heat pump cycle can use air energy to make hot water when there is no waste water source, creating conditions for making domestic hot water that exceeds the amount of bathing waste water; (2) The equipment cost is greatly reduced, compared with adding an independent air source heat pump Compared with the conventional heat pump, the utility model saves a compressor and a hot water heat exchanger; (3) the connection pipeline of the dual-source heat pump is simplified, and the air source evaporator and the water source evaporator share a hot water condenser; (4) the problem that the evaporator of the independent air source heat pump cannot absorb heat during the defrost cycle is solved. The dual-source heat pump of the utility model can use the water source heat exchanger in the defrost cycle as an evaporator, and use the wastewater to provide heat during the defrost cycle, thereby accelerating the defrost speed and allowing the air source heat pump of the dual-source heat pump to operate normally in winter; (5) when the temperature is higher than 25℃, the second hot water air source heat pump cycle and the two-stage temperature difference heat transfer preheating of the clean water and the wastewater exhaust gas can be used independently to produce hot water, which is more efficient than using the wastewater source heat pump cycle to produce hot water.

[0025] 4. The scientific arrangement of the superposition of two heat pumps and four hot water production modes is scientific in the following aspects: (1) The superposition of two heat pumps adopts the superposition mode of dual-source heat pump and water-source heat pump to increase the hot water temperature, which solves the problem that when heating hot water by direct heating, one heat pump needs to bear the large temperature rise of nearly 20°C, which brings about excessive heat transfer temperature difference, small water flow, low heat transfer efficiency and large irreversible loss. Each stage of the two-stage heat pump bears a temperature rise of about 10°C of hot water, which increases the output power of the heat pump and improves the efficiency; (2) The order of the evaporators and condensers of the two heat pumps in the wastewater process and the clean water heating process is exchanged, which means that the order of the evaporators of the water-source heat pump and the dual-source heat pump in the wastewater process is cross-configured with the order of their condensers in the clean water heating process, that is, the evaporator of the water-source heat pump is after the evaporator of the dual-source heat pump in the wastewater process, while the condenser of the water-source heat pump is after the condenser of the dual-source heat pump in the clean water process. Before the condenser, this arrangement makes the working temperature difference between the hot water condenser and the evaporator of the water source heat pump and the dual-source heat pump within 40°C, and the heat pump cycle efficiency is the highest; (3) Four hot water making modes, when there is no wastewater, the wind source heat pump can be used to circulate hot water; when there is a wastewater source, it can reasonably select two-stage water source heat pump circulation to make hot water, or one-stage water source heat pump and wind source heat pump combined circulation to make hot water according to the changes in tap water temperature and air temperature, so as to give full play to the efficiency of the unit; the bathing waste water and waste gas heat combined heat pump hot water unit of the utility model can recycle bathing waste water and waste gas heat to make hot water, and can also use the attached integrated air source to assist in hot water making, as well as four hot water making modes, so it can produce hot water exceeding the amount of bathing waste water at low cost and high efficiency, meet user needs, and the annual average COP of hot water making is higher than 6, creating a new mode of efficient use of bathing waste water and waste gas heat to save energy in producing domestic hot water.

[0026] To sum up, according to the above 4 points, the wastewater and waste gas heat recovery water heater system of the utility model has original breakthroughs and innovations in the recovery of bathing wastewater and waste gas heat, system functions, system structure, circulation modes and their selection, etc., with outstanding novelty, obvious advancement and definite practicality, and meets the three requirements of invention patents. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 , is a schematic diagram illustrating the system principle of Example 1 of the wastewater and waste gas heat recovery water heater system described in the utility model.

[0028] Figure 2 , is a wastewater and waste gas heat-receiving water heater system of the utility model, a schematic diagram of the system structure of Example 1 and an illustration of the first hot water making mode.

[0029] Figure 3 , is a wastewater and waste gas heat-recovering water heater system of the present invention, a schematic diagram of the system structure of Example 1 and an illustration of the second water-heating mode.

[0030] Figure 4 , is a wastewater and waste gas heat-receiving water heater system of the utility model, a schematic diagram of the system structure of Example 1 and an illustration of the third hot water making mode.

[0031] Figure 5 , is a wastewater and waste gas heat-recovering water heater system of the utility model, a schematic diagram of the system structure of Example 1 and an illustration of the fourth hot water making mode.

[0032] Figure 6 , is an illustration of the system defrosting mode of Example 1 of the wastewater and waste gas heat-receiving water heater system described in the present invention.

[0033] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings, but the present invention is not limited thereto. DETAILED DESCRIPTION

[0034] The wastewater and waste gas heat recovery water heater system described in the utility model is a bathing wastewater and waste gas heat recovery heat pump water heater system, and its system process, basic structure and working principle are as follows: Figure 1 , 2 , 3, 4, and 5 are explained together;

[0035] Figure 1 , is a schematic diagram of the system principle of the wastewater and waste gas heat recovery water heater system of the utility model, and embodiment 1; Figure 1 As shown, the wastewater and waste gas heat recovery water heater system includes: a water source heat pump ( Figure 1 As shown in the dashed box B), dual-source heat pump ( Figure 1 As shown in the dashed box A), wastewater heat recovery system, clean water heating system; the wastewater and exhaust gas heat recovery water heater system also includes Figure 1 The wastewater heat exchanger cleaning system and signal detection control system not shown;

[0036] The wastewater heat recovery system, see Figure 1 and Figure 2-5, including: a wastewater tank or wastewater pool 6, a wastewater pump 9, a clean water-wastewater heat exchanger 1, a three-way valve 20, an evaporator 8 of a water source heat pump and a water source evaporator 7 of a dual-source heat pump; its connection method is, see the dotted line (dashed line) connection in the figure: the inlet and outlet interfaces of the wastewater pump 9 are respectively connected to the wastewater outlet pipe of the wastewater tank 6 and the wastewater passage inlet of the clean water-wastewater heat exchanger 1; the wastewater passage outlet of the clean water-wastewater heat exchanger is connected to the third interface, i.e., the water inlet interface, of the three-way valve 20; the first and second water outlets (①, ②) of the three-way valve are respectively connected to the water inlet of the water source evaporator 7 of the dual-source heat pump and the water inlet of the evaporator 8 of the water source heat pump; the water outlet of the water source evaporator 7 of the dual-source heat pump and the water inlet of the evaporator 8 of the water source heat pump are interconnected by pipelines; the wastewater recovery system thus formed has two wastewater passages: the first wastewater heat exchange passage, see Figure 2 The passage connected by the dotted arrow has the following flow: wastewater tank or wastewater pool 6, wastewater pump 9, clean water-wastewater heat exchanger 1, first outlet (①) of three-way valve 20, water source evaporator 7 of dual-source heat pump, evaporator 8 of water source heat pump, drainage ditch; second wastewater heat exchange passage, see Figure 3 The passage connected by the dotted arrow has a flow of wastewater tank or wastewater pool 6, wastewater pump 9, clean water-wastewater heat exchanger 1, the second outlet (②) of the three-way valve 20, evaporator 8 of the water source heat pump, and drainage ditch;

[0037] The fresh water heating system, see Figure 1 and Figure 2-5 , which consists of a four-stage direct heating system for clean water and a hot water circulation heating system;

[0038] The four-stage direct heating system of clean water is: Figure 1-4 The passage connected by the thick solid arrow is composed of the first water inlet valve Z1, the water inlet one-way pressure relief valve 12, the clean water flow regulating valve or the frequency conversion pump 10, the clean water-waste water heat exchanger 1 as a first-level heater, the humid hot air-clean water heat exchanger 2 as a newly added second-level heater, the hot water condenser 3 of the water source heat pump as a third-level heating, the one-way valve 13, the hot water condenser 4 of the dual-source heat pump as a fourth-level heating, and the hot water tank 5, which are connected in sequence with pipelines to form a process; the clean water four-level direct heating system has two operating modes of four-level heating and three-level heating; the three-level heating operating mode is a clean water heating mode in which the hot water condenser 3 of the water source heat pump does not participate in heat exchange in the clean water four-level direct heating system.

[0039] The hot and humid air-clean water heat exchanger 2 is a heat exchanger with finned tubes. The clean water in the tube exchanges heat with the hot and humid air flowing through the bathhouse outside the tube. It is hoisted at the hot and humid air exhaust vent on the top of the bathroom. Each of the multi-story bathrooms in the same unit of the building is hoisted with a hot and humid air-clean water heat exchanger; the parallel water pipes at the inlet and outlet of each hot and humid air-clean water heat exchanger 2 are called the first and second connecting water pipes L1 and L2 (see Figure 1), passes through each floor and is connected to the water outlet of the fresh water-waste water heat exchanger installed in the machine room and the water inlet of the hot water condenser of the water source heat pump.

[0040] The hot water circulation heating system, see Figure 1 , 5 , is: a hot water circulation heating system consisting of a hot water tank 5, a one-way valve 14, a hot water circulation pump 11, a hot water condenser 4 (circulation heating) of a dual-source heat pump, and a hot water tank 5, connected by pipes, see Figure 5 The thick solid arrow connects the passage; the hot water tank 5 is provided with a hot water main pipe equipped with a water outlet valve 15 connected to the user's hot water supply pipe; there are two ways to replenish water in the hot water tank, one is to replenish water through the clean water four-stage direct heating system, and the other is to replenish water through the second water inlet valve Z2 connected to the inlet pipeline of the hot water circulation pump.

[0041] like Figure 2-5 As shown, the dual-source heat pump of the wastewater and waste gas heat-collecting water heater system is a conventional water source heat pump water heater, which is added with an air source evaporator 24, a four-way valve 23 and the first and second throttles J1 and J2; the dual-source heat pump comprises: a compressor 21, a hot water condenser 4, the first and second throttles J1 and J2, an air source evaporator 24, a water source evaporator 7, a four-way valve 23, and a gas-liquid separator 22 (fluorine liquid storage device); the connection method is: the outlet of the compressor 1 is divided into two paths, one path is connected to the air inlet of the hot water condenser 4, and the other path is connected to the first interface of the four-way valve 23 as the air inlet (①); the second, third, and fourth interfaces of the four-way valve are the right, left, and The middle interfaces (②, ③, ④) are respectively connected to the first interfaces of the air source evaporator 24, the water source evaporator 7 and the inlet of the gas-liquid separator 22; the liquid outlet of the hot water condenser 4 is respectively connected to the second interfaces of the air source evaporator 24 and the water source evaporator 7 through the first and second throttles J1 and J2; the second interfaces of the air source evaporator and the water source evaporator are connected by the third throttle J3; the connected circuit is filled with refrigerant; the air source evaporator 24 is installed outdoors, and is connected to the second interface (②) of the four-way valve 23 of the dual-source heat pump installed in the machine room and the outlet of the first throttle J1 through a connecting pipe; the pipeline connecting valves C1 and C2 are installed on the main fluorine road of the dual-source heat pump.

[0042] The wastewater and waste gas heat-collecting water heater system of the utility model has a fluorine circuit of the dual-source heat pump having the first and second hot water heat pump circulation modes and a defrosting circulation mode:

[0043] First hot water wastewater source heat pump cycle, see Figure 2The circulation loop indicated by the solid arrow in the dotted frame of the A dual-source heat pump is in operation: the compressor 21 is running, and the four-way valve 23 is in a state where the first and second interfaces are connected (①② in the attached figure) and the third and fourth interfaces are connected (③④ in the attached figure); the fluorine circuit process is: compressor 21, hot water condenser 4, second throttle J2, water source evaporator 7 (heat absorption, wastewater pump 9 is running), four-way valve 23 (③④ in the attached figure), gas-liquid separator 22 (fluorine liquid storage device), compressor 21;

[0044] The second hot water air source heat pump cycle, see Figure 3 The circulation loop indicated by the solid arrow in the dotted frame of the A dual-source heat pump is in operation: the compressor 21 is running, and the four-way valve 23 is in the state of being connected in the first and third interfaces (①③ are connected) and in the second and fourth interfaces (②④ are connected); the fluorine circuit process is: compressor 21, hot water condenser 4, first throttle, wind source evaporator 24 (heat absorption, fan 3a is running), four-way valve 23 (passage in the second and fourth interfaces, ②④ are connected), gas-liquid separator 22 (fluorine liquid storage device), compressor 21;

[0045] Third defrost cycle, see Figure 6 The circulation loop indicated by the solid arrow in the dotted frame of the A dual-source heat pump is in operation: the compressor 21 is running, and the four-way valve 23 is in the state of being connected in the first and second interfaces (①② connected) and in the third and fourth interfaces; the fluorine circuit process is: compressor 21, four-way valve 23 (pathway in the first and second interfaces, ①② connected), air source evaporator 24 (blower stops for 3a, defrosting, refrigerant high pressure state), third throttle J3, water source evaporator 7 (heat absorption, wastewater pump 9 operation), four-way valve 23 is connected in the third and fourth interfaces (③④ connected), gas-liquid separator 22 (fluorine liquid storage device), compressor 21; auxiliary: the first wastewater heat exchange path of wastewater is running, the four-stage direct heating system of clean water and the hot water circulation loop are running, and the flow ratio of clean water to wastewater is 1:1.2; the water source heat pump is running, see Figure 6 The circulation loop of the B water source heat pump is marked by the solid arrow in the dotted box.

[0046] The water source heat pump, see Figure 2 There is only one cycle, namely the water source heat pump cycle, and its fluorine circuit process is: compressor 31, hot water condenser 3 of the water source heat pump, throttle J4, evaporator 8 of the water source heat pump, gas-liquid separator 32, compressor 31.

[0047] The signal detection and control system described above, and the arrangement of the temperature signal probes in the system, refer to Figure 2-6 , including the tap water inlet temperature T1, the outlet water temperature T2 of the clean water-waste water heat exchanger (primary heating), the outlet water temperature T 12(secondary heating), outlet water temperature of the hot water condenser of the water source heat pump T3 (third-stage heating), outlet water temperature of the hot water condenser of the dual-source heat pump T4 (fourth-stage heating), water temperature of the hot water tank T5; ambient air temperature T6, wall temperature of the air source evaporator T7; initial wastewater temperature T8, wastewater outlet temperature of the clean water-wastewater heat exchanger T9, outlet water temperature of the water source evaporator of the dual-source heat pump T 10 , the outlet water temperature of the evaporator of the water source heat pump is T 11 ; Humidity temperature T 13 ; The detections not shown in the figure include the water level of the wastewater tank, the water level of the hot water tank, the relative humidity of the bathroom, the detection of the flow of clean water and wastewater, and a control system based on the measured signals. The control system executes the start and stop of the compressor, the fan 3a, and the wastewater pump 10, and adjusts the flow of clean water and wastewater according to the detection signals and the operating mode requirements.

[0048] The wastewater and waste gas heat-collecting water heater system of the utility model is characterized in that the wastewater and waste gas heat-collecting water heater system can organize four hot water making modes and a defrosting mode:

[0049] First hot water mode, see Figure 2 , Operation: Water source heat pump cycle, see Figure 2 The solid arrow in the dotted box B shows the cycle; the first water source heat pump of the dual source heat pump makes hot water, see Figure 2 The solid arrow in the dotted box in A shows the cycle; the four-stage heating operation mode of fresh water, see Figure 2 The thick solid arrows in the four-stage direct heating system of clean water show the process flow; for example, the tap water inlet temperature T1 = 8°C, the outlet water temperature of the clean water-waste water heat exchanger T2 = 22°C (after the first stage of heating), and the outlet water temperature of the wet hot gas-clean water heat exchanger T 12 = 26°C (secondary heating), the outlet water temperature of the hot water condenser of the water source heat pump is T3 = 35°C (third-stage heating), and the outlet water temperature of the hot water condenser of the dual-source heat pump is T4 = 45°C (fourth-stage heating); the first wastewater heat exchange path, see Figure 2 The thick dashed arrow in the wastewater flow chart shows that, for example, the initial temperature of the wastewater is T8 = 32 °C, the outlet temperature of the wastewater from the clean water-wastewater heat exchanger is T9 = 18 °C, and the outlet temperature of the wastewater from the water source evaporator of the dual-source heat pump is T 10 =10℃, the wastewater outlet temperature of the evaporator of the water source heat pump is T 11 =4℃; humidity temperature T 13 =39℃, relative humidity 94%; enabling conditions: when there is wastewater and the tap water temperature is lower than 15℃ in winter.

[0050] Second hot water mode, see Figure 3 , Operation: Water source heat pump cycle, see Figure 3The cycle shown by the solid arrow in the dotted box B in the figure; the second hot water air source heat pump cycle of the dual-source heat pump, see the cycle shown by the solid arrow in the dotted box A in the figure; the four-stage fresh water heating mode, see Figure 3 The process shown by the thick arrow in the middle is as follows: the flow ratio of clean water to waste water is 1 / 1, the inlet temperature of tap water is T1 = 12°C, the heat transfer temperature difference of the clean water-waste water heat exchanger is 9°C, the outlet temperature of clean water is T2 = 23°C (after primary heating), and the outlet temperature of the humid hot gas-clean water heat exchanger is T 12 =27℃ (secondary heating), the outlet water temperature of the hot water condenser of the water source heat pump T3 = 38℃ (third-stage heating), the outlet water temperature of the hot water condenser of the dual-source heat pump T4 = 45℃ (fourth-stage heating); the second wastewater heat exchange path, see the wastewater flow shown by the thick dotted arrow in the figure, for example, the initial temperature of the wastewater T8 = 32℃, the outlet water temperature of the wastewater from the clean water-wastewater heat exchanger T9 = 21℃, the outlet water temperature of the evaporator of the water source heat pump T 11 =11℃; humidity temperature T 13 =39℃, relative humidity 94%; activation conditions: daily average temperature is higher than 15℃, theoretically based on the temperature when the performance (COP) of the second hot water air source heat pump cycle of the dual-source heat pump is higher than that of the water source heat pump, that is, higher than the performance of the evaporator of the water source heat pump when the wastewater temperature drops from 10℃ to 4℃; and in the second hot water making mode, the secondary heat recovery of the tertiary heat recovery of wastewater heat is moved to the water source heat pump for execution, and the second air source heat pump with a higher temperature is used to make hot water. Obviously, the heat pump efficiency is higher than the efficiency of the last-stage water source heat pump of the tertiary heat recovery of wastewater heat to make hot water.

[0051] The third hot water mode, see Figure 4 , Operation: The first hot water wastewater source heat pump cycle of the dual source heat pump, see Figure 4 The solid arrow in the dotted box A shows the cycle; the three-stage heating mode of the clean water direct heat path, see the process shown by the thick arrow in the figure, for example, the clean water and wastewater flow ratio is 1:1, the tap water inlet temperature T1 = 20 ° C, the heat transfer temperature difference of the clean water-wastewater heat exchanger is 4 ° C, the clean water outlet temperature T2 = 28 ° C (after the first stage of heating), the outlet temperature of the humid hot gas-clean water heat exchanger T 12 =32°C (secondary heating), the hot water condenser T3 of the water source heat pump =32°C (not involved in heat exchange), the outlet water temperature of the hot water condenser of the dual-source heat pump T4 =45°C (fourth-stage heating); and the first wastewater heat exchange path mode, see the wastewater flow shown by the thick dotted arrow in the figure, for example, the initial wastewater temperature T8 =32°C, the wastewater outlet temperature T9 of the clean water-wastewater heat exchanger =24°C, the evaporator outlet water temperature T of the dual-source heat pump 10 =12℃, the evaporator outlet water temperature of the water source heat pump is T 11 =12℃; humidity temperature T 13=39℃, relative humidity 94%; enabling conditions: there is wastewater, and the tap water inlet temperature T1≥20℃.

[0052] The fourth hot water mode, see Figure 5 , Operation: The second hot water air source heat pump cycle of the dual source heat pump, see Figure 5 The circulation is shown by the solid arrow in the dotted box A; the clean water circulation heating circuit, refer to the process shown by the thick solid arrow in the figure, the water temperature rises by 5℃ each time the cycle; operating conditions: no waste water, the water temperature of the hot water tank is lower than the set water temperature when T5<45℃, the water circulation heating of the hot water tank is suitable for the initial installation of the equipment without bathing waste water and the valley period; no waste water.

[0053] Defrost mode: See Figure 6 , Operation: The third defrost cycle of the dual source heat pump, see Figure 6 The solid arrow in the dotted box in A shows the cycle, and the fluorine circuit process: compressor 21, four-way valve 23 (pathway in the first and second interfaces), air source evaporator 24 (defrosting, fan stopped), the third throttle, water source evaporator 7 (wastewater pump operation), four-way valve 23 (connected in the third and fourth interfaces), gas-liquid separator 22 (fluorine liquid storage device), compressor 21; the compressor, wastewater pump, and hot water circulation pump are powered on and operated, and the first position of the four-way valve coil is on (④③ paths). The activation conditions are: the air source evaporator is severely frosted, and the temperature difference between the outdoor temperature and the air source evaporator tube wall temperature suddenly exceeds the set value; when the temperature difference of the air source evaporator tube wall temperature recovers to more than 8°C, it is restored to the original hot water making mode; auxiliary: the first wastewater heat exchange path of wastewater is in operation, the clean water direct heat path and the hot water circulation loop are in operation, and the clean water and wastewater flow ratio is 1:1.2; the water source heat pump is in operation.

[0054] The wastewater and waste gas heat-absorbing water heater system of the utility model is characterized in that: the wastewater and waste gas heat-absorbing water heater system is a multi-body connection system, the water source heat pump and the dual-source heat pump (except the air source evaporator) are installed as an integrated dual heat pump unit, and are installed together with the wastewater tank, the hot water tank, the hot water circulation pump, the wastewater pump, and the control system in the machine room; the air source evaporator of the dual-source heat pump is independently installed outdoors the machine room; the humid hot air-clean water heat exchanger is hoisted on the ceiling of the bathroom on each floor, and is connected to the water outlet of the clean water-wastewater heat exchanger in the machine room and the water inlet of the hot water condenser of the water source heat pump through the first and second connecting water pipes; the signal detection probes of the system are installed at the required locations of the unit; the hot water tank is installed on the top floor of the building above the bathrooms.

Claims

1. The wastewater and waste gas heat recovery water heater system is a bathing wastewater and waste gas heat recovery heat pump water heater system, including: Water source heat pump, wastewater heat recovery system, clean water heating system, wastewater heat exchanger cleaning system, signal detection and control system; its characteristics are: it also includes dual-source heat pump and waste gas heat recovery system; The wastewater heat recovery system is composed of a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, a three-way valve, a water source evaporator of a dual-source heat pump, and an evaporator of a water source heat pump; the three-way valve is a one-inlet and two-outlet three-way valve, and has three interfaces, namely, the first, second, and third interfaces. The first and second interfaces are water outlet interfaces, which are respectively connected to the water inlet of the water source evaporator of the dual-source heat pump and the water inlet of the evaporator of the water source heat pump; the third interface is a water inlet interface, which is connected to the wastewater passage outlet of the clean water-wastewater heat exchanger The outlet of the water source evaporator of the dual-source heat pump is also connected to the water inlet of the evaporator of the water source heat pump; the first wastewater heat exchange path is a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, the third and first interface paths of the three-way valve, the water source evaporator of the dual-source heat pump, the evaporator of the water source heat pump, and a drain; the second wastewater heat exchange path is a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, the third and second interface paths of the three-way valve, the evaporator of the water source heat pump, and a drain; The exhaust gas heat recovery system is a wet hot air-clean water heat exchanger with finned tubes. Clean water in the tube exchanges heat with wet hot air flowing through the bathroom outside the tube. The system is hoisted at the wet hot air exhaust outlet on the top of each bathroom. In the multi-storey bathrooms of the same unit of the building, each bathroom is hoisted with a wet hot air-clean water heat exchanger. The parallel water pipes at the inlet and outlet are called the first and second connecting water pipes, which pass through each floor and are respectively connected to the outlet of the clean water-waste water heat exchanger installed in the machine room on the ground floor and the water inlet of the hot water condenser of the water source heat pump. The clean water heating system includes: clean water four-stage direct heating and hot water circulation heating system; the clean water four-stage direct heating system is composed of a water inlet valve, a water inlet one-way pressure relief valve, a clean water flow regulating valve or a frequency conversion pump, a clean water-waste water heat exchanger, a moist hot air-clean water heat exchanger, a hot water condenser of a water source heat pump, a one-way valve, a hot water condenser of a dual-source heat pump, and a hot water tank, which are connected in sequence with pipelines; the clean water four-stage direct heating system has two operating modes: four-stage heating and three-stage heating; the three-stage heating operating mode , which is a fresh water heating mode in which the hot water condenser of the water source heat pump in the four-stage heating mode does not participate in heat exchange; the hot water circulation heating system is: a loop formed by a hot water tank, a one-way valve, a hot water circulation pump, a hot water condenser of a dual-source heat pump, and a hot water tank connected by pipes; the hot water tank has a hot water outlet main pipe, and an outlet valve is installed on the hot water outlet main pipe; there are two ways to replenish water in the hot water tank, one is to replenish water through the fresh water four-stage direct heating system, and the other is to replenish water through the second water inlet valve connected to the inlet pipe of the hot water circulation pump.

2. The wastewater and waste gas heat recovery water heater system according to claim 1 is characterized in that: The dual-source heat pump is a wind-water dual-source heat pump that adds an air source evaporator, a four-way valve and first and second throttles to the fluorine circuit of a conventional water source heat pump water heater; the dual-source heat pump includes: a compressor, a hot water condenser, the first and second throttles, an air source evaporator, a water source evaporator, a four-way valve, and a gas-liquid separator; its connection method is: the outlet of the compressor is divided into two paths, one path is connected to the air inlet of the hot water condenser, and the other path is connected to the first interface of the four-way valve; the liquid outlet of the hot water condenser is connected to the second interface of the air source evaporator and the water source evaporator respectively through the first and second throttles; the second, third and fourth interfaces of the four-way valve are connected to the first interface of the air source evaporator, the water source evaporator and the inlet of the gas-liquid separator respectively; the second interface of the air source evaporator and the water source evaporator are interconnected by the third throttle; the connected circuit is filled with refrigerant; the air source evaporator is installed outdoors, and is connected to the second interface of the four-way valve and the outlet of the first throttle of the dual-source heat pump installed indoors through a connecting pipe.

3. The wastewater and waste gas heat recovery water heater system according to claim 1 is characterized in that: The fluorine circuit of the dual-source heat pump has two hot water cycles and defrosting cycles: The first hot water wastewater source heat pump circulates, the compressor is running, the four-way valve is in the state of being connected in the first and second interfaces and in the third and fourth interfaces, and the fluorine circuit process is: compressor, hot water condenser, second throttle, water source evaporator, four-way valve, gas-liquid separator, compressor; The second hot water air source heat pump circulates, the compressor is running, the four-way valve is in a state where the first and third interfaces are connected and the second and fourth interfaces are connected, and the fluorine circuit process is: compressor, hot water condenser, first throttle, air source evaporator, four-way valve, gas-liquid separator, compressor; In the third defrost cycle, the compressor is running, the four-way valve is in a state where the first and second interfaces are connected and the third and fourth interfaces are connected. The fluorine circuit process is: compressor, four-way valve, air source evaporator, third throttle, water source evaporator, four-way valve, gas-liquid separator, compressor.

4. The wastewater and waste gas heat recovery water heater system according to claim 1 is characterized in that: The wastewater and waste gas heat recovery water heater system can organize four hot water production operation modes: The first hot water making mode operates as follows: water source heat pump cycle, the first hot water making wastewater source heat pump cycle of the dual source heat pump, the four-stage heating of the clean water four-stage direct heating system and the first wastewater heat exchange path mode; activation conditions: there is wastewater, and the inlet tap water temperature is lower than 15°C in winter; the water source heat pump cycle, the fluorine path process is: compressor, hot water condenser of the water source heat pump, throttle, evaporator of the water source heat pump, gas-liquid separator, compressor; The second hot water production mode operates as follows: water source heat pump circulation, the second hot water production air source heat pump circulation of the dual-source heat pump, the four-stage heating of the fresh water four-stage direct heating system and the second waste water heat exchange path mode; activation conditions: the daily average temperature is higher than 20℃ or the temperature exceeds the water source evaporator discharge temperature of the dual-source heat pump; The third hot water making mode, operation: the first hot water making wastewater source heat pump circulation of the dual source heat pump, the three-stage heating of the clean water four-stage direct heating system and the first wastewater heat exchange path mode; the water source heat pump stops running; the three-stage heating mode of the clean water four-stage direct heating system is that when the clean water flows through the clean water four-stage direct heating system, it only passes through the three-stage heating of the hot water condenser of the clean water-wastewater heat exchanger and the moist hot air-clean water heat exchanger of the dual source heat pump, and no heat is exchanged in the hot water condenser of the water source heat pump; activation conditions: there is wastewater, and the inlet tap water temperature is higher than 20℃; The fourth hot water making mode operates as follows: the second hot water making air source heat pump circulation of the dual source heat pump, the clean water circulation heating loop mode; the water source heat pump stops running; operating conditions: there is no waste water, there is water in the hot water tank, and when the water temperature of the hot water tank is lower than the set water temperature, the water in the hot water tank is circulated and heated, which is suitable for the initial installation of the equipment without bathing waste water and during the off-peak period.

5. The wastewater and waste gas heat recovery water heater system according to claim 1 is characterized in that: The heat absorbed by the water source evaporator of the third defrost cycle of the dual-source heat pump and the compression work of the compressor are released in the air source evaporator for defrosting; in defrosting mode, operation: the compressor, wastewater pump, and hot water circulation pump are powered on, and the first position of the four-way valve coil is on; enabling conditions: the air source evaporator is severely frosted, and the temperature difference between the outdoor temperature and the air source evaporator pipe wall temperature suddenly exceeds the set value; when the temperature difference of the air source evaporator pipe wall temperature recovers to more than 8°C, it returns to the original hot water making mode; Auxiliary: The first wastewater heat exchange path is in operation, the clean water direct heat path and the hot water circulation loop are in operation, and the clean water to wastewater flow ratio is 1:1.2; the water source heat pump is in operation.

6. The wastewater and waste gas heat recovery water heater system according to claim 1 is characterized by: The signal detection includes: the inlet temperature of tap water, the outlet temperature of the clean water-waste water heat exchanger, the outlet temperature of the humid hot air-clean water heat exchanger, the outlet temperature of the hot water condenser of the water source heat pump, the outlet temperature of the hot water condenser of the dual-source heat pump, and the water temperature of the hot water tank; the ambient air temperature, the tube wall temperature of the wind source evaporator; the initial temperature of the wastewater, the outlet temperature of the wastewater of the clean water-waste water heat exchanger, the outlet temperature of the water source evaporator of the dual-source heat pump, and the outlet temperature of the evaporator of the water source heat pump; the humidity temperature; the detections not shown in the figure include the water level of the wastewater tank, the water level of the hot water tank, the relative humidity of the bathroom, and the detection of the flow of clean water and wastewater; the control system is a control system that executes the start and stop of the compressor, outdoor fan, hot water circulation pump, and wastewater pump, as well as the flow regulation of clean water and wastewater according to the detection signal and the operating mode requirements.

7. The wastewater and waste gas heat recovery water heater system according to claim 1 is characterized by: The wastewater and waste gas heat-absorbing water heater system is a multi-body connection system. The water source heat pump and the dual-source heat pump are installed as an integrated dual heat pump unit except for the air source evaporator, and are installed in the machine room together with the wastewater tank, hot water circulation pump, wastewater pump, and control system; the air source evaporator of the dual-source heat pump is independently installed outdoors the machine room; the humid hot air-clean water heat exchanger is hoisted on the ceiling of the bathroom on each floor, and is connected to the water outlet of the clean water-wastewater heat exchanger in the machine room and the water inlet of the hot water condenser of the water source heat pump through the first and second connecting water pipes; the signal detection probes of the system are installed where the unit needs them; the hot water tank is installed on the top floor of the building above the bathrooms.

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