Air-water double-source collaborative circulating water heater

Abstract

The utility model relates to an air-water double-source collaborative circulating water heater which comprises a double-source heat pump, a waste water heat recovery system and a clear water heating system. The device is characterized by consisting of a compressor, a hot water condenser, an air source and water source evaporator, a plurality of throttlers and a four-way valve or a three-way valve, the first double-source heat pump is connected through a fluorine path. An outlet of a compressor is connected with a four-way valve and a hot water condenser in a branching mode. A liquid outlet of the hot water condenser is connected with two ports of a third throttler through a first throttler and a second throttler and first ports of a water source evaporator respectively. A second connector, a third connector and a fourth connector of the four-way valve are connected with a second connector of the air source evaporator, a second connector of the water source evaporator and an inlet of the gas-liquid separator-compressor respectively, and the formed double-source heat pump can absorb heat of waste water or an air source to heat water circulation through switching of the four-way valve. Waste water heat is recovered through a clear water-waste water heat exchanger and a water source evaporator; clean water is heated by the clean water-waste water heat exchanger and the hot water condenser; a second double-source heat pump fluorine path is controlled by a three-way valve, an outlet of a compressor is only in butt joint with a hot water condenser, and air and water sources can be connected in series to circularly absorb heat and heat water.

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 about 15-20% of the building energy consumption. Therefore, energy saving of hot water is an important part of energy saving and consumption reduction. At present, hot water for domestic use is mainly provided by electric water heaters and gas water heaters. These two water heaters use high-quality electricity and gas to produce low-quality hot water for bathing, which is a waste of energy quality. At present, 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-level residents of buildings with more than 6 floors 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 scientifically utilize energy quality. The efficiency of air energy heat pump water heaters using ambient air energy as heat source is closely related to the temperature, and the efficiency is low when the temperature is low in winter. Water source heat pumps require water sources. Huai'an Hengxin Nuojin Technology Co., Ltd. and the applicant have cooperated to propose a cascade utilization of bathing waste water. The water source heat pump water heater technology of water thermal energy can use bathing wastewater at a temperature above 12℃ to produce a 1:1 ratio of hot water with the same amount of wastewater; however, the use of bathing wastewater heat source alone cannot meet the demand for domestic hot water that exceeds the amount of water used for bathing, and there is an urgent need to find a method for making hot water with a cheap auxiliary heat source; although Huaian Hengxin Nokin Technology Co., Ltd. proposed geothermal source as an auxiliary heat source, digging a well is limited by the site and the cost is also relatively high; and currently engineers can also think of using air source as an auxiliary heat source, and the technology used is to assemble a traditional single-function air source heat pump water heater on the market, which makes the system complex and increases the cost; single-function air source and water source heat pumps cannot play the dual-effect energy-saving role of cooling air and supplying hot water in summer; furthermore, since the tap water temperature will range from 7℃ to 25℃ throughout the year, and the ambient atmosphere will fluctuate from 10℃ below 0 to 40℃, single-function air source and water source heat pump water heaters are difficult to cope with, or it is difficult to match the most energy-saving operation mode. 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 adapt to the differences in climate between the north and south of the country, the utility model proposes a wind and water dual-source cooperative circulation water heater, which is composed of a compressor, an air source evaporator, a water source evaporator and a hot water condenser, a throttle and a fluorine circuit control valve. It combines multiple circulation heat pump water heaters in one system, and there are two designs, which are respectively recorded as: the first and the second dual-source water heaters; the first dual-source water heater is controlled by a four-way valve and three throttles, and organizes three types: separate circulation of air source and water source and defrosting circulation; the second dual The wind and water dual-source cooperative circulation water heater is composed of four types: wind source, dual-source parallel, dual-source series circulation and alternating operation defrosting; the water source is bathing wastewater, secondary heat recovery; the wind and water dual-source cooperative circulation water heater, one unit can replace two single-source water heaters, saving more than 60% of equipment cost, and when the wind and water dual-source is circulated in parallel or series, the heat output capacity and efficiency of the heat pump are greatly improved because the evaporator area is expanded; the dual sources complement each other in winter, with obvious advantages, and it is a breakthrough innovation in the dual-source heat pump circulation mode; the energy-saving effect is obvious, with an average annual COP of more than 6, and it is a new energy-saving product for efficiently producing domestic hot water.

[0004] The utility model of Fengshui dual-source cooperative circulation water heater is characterized by: comprising a dual-source heat pump, a wastewater heat recovery system, a clean water heating system, a wastewater heat exchanger cleaning system, and a signal detection and control system; the wastewater heat recovery system comprises: a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, and a water source evaporator; the clean water heating system comprises a clean water-wastewater heat exchanger, a hot water condenser, a hot water tank, a water inlet valve, a hot water outlet valve, and a hot water circulation pump; the signal detection and control system comprises The dual-source heat pump comprises a compressor, a hot water condenser, an air source evaporator, a fluorine circuit control valve, a throttle, and a gas-liquid separator. The dual-source heat pump has two structural modes, which are respectively recorded as the first and second dual-source heat pumps; the first dual-source heat pump, its fluorine circuit control valve is a four-way valve, and the throttle has the first, second and third throttles; the second dual-source heat pump, its fluorine circuit control valve is a three-way valve, and the three-way valve has three interfaces: left, middle and right, the middle interface is the air inlet, and the left and right interfaces are both air outlets; the throttle has the first and second throttles; the Feng Shui dual-source synergy composed of the first dual-source heat pump The circulating water heater, referred to as the first dual-source water heater, has the functions of separate circulation of wind source and water source for hot water making and using wastewater heat for defrosting; the wind and water dual-source coordinated circulating water heater composed of the second dual-source heat pump, referred to as the second dual-source water heater, has the functions of wind source, dual-source parallel connection, and dual-source series circulation for hot water making, and can use wastewater heat for defrosting through dual-source series connection; the wind source evaporators of the first and second dual-source water heaters are both installed separately outdoors, and the remaining components are installed indoors, which is a one-system two-body dual-source water heater.

[0005] The wind and water dual-source cooperative circulation water heater is characterized in that: the refrigerant circuit connection method of the first dual-source heat pump is: the compressor outlet is divided into two paths, the first path is connected to the first inlet of the four-way valve, and the second path is connected to the air inlet of the hot water condenser; the liquid outlet of the hot water condenser is connected in parallel with the first and second throttles, and the second interfaces of the first and second throttles are respectively connected to the first port liquid inlet of the water source evaporator and the wind source evaporator; the first port liquid inlet of the water source evaporator and the wind source evaporator are interconnected by a third capillary throttle; the fourth interface of the four-way valve is connected to the inlet of the gas-liquid separator; the outlet of the gas-liquid separator is connected to the air inlet of the compressor; the connected circuit is filled with refrigerant.

[0006] The wind and water dual-source cooperative circulation water heater is characterized in that: the refrigerant circuit connection method of the second dual-source heat pump is: the air outlet of the compressor is connected to the first interface air inlet of the hot water condenser (the upper interface in the figure), and the second interface liquid outlet of the hot water condenser (the lower interface in the figure) is divided into two paths, which are respectively connected to the first port inlet of the first and second throttles; the second ports of the first and second throttles are respectively connected to the first interfaces of the wind source evaporator and the source evaporator; the second interface of the water source evaporator is connected to the middle air inlet interface of the three-way valve; the left air outlet interface of the three-way reversing valve is connected to the first interface of the wind source evaporator; the second interface of the wind source evaporator (the right interface in the figure) and the right air outlet interface of the three-way valve are jointly connected to the air inlet of the gas-liquid separator; the air outlet of the gas-liquid separator is connected to the air inlet of the compressor; the connected dual-source heat pump circulation loop is filled with refrigerant.

[0007] The Fengshui dual-source cooperative circulation water heater is characterized in that the refrigerant flow, activation conditions, and operation control of the three hot water production cycles of the first dual-source water heater are respectively:

[0008] Air source circulation: a loop formed by the compressor, hot water condenser, the first throttle, the air source evaporator, the four-way valve, the gas-liquid separator, and the compressor; starting conditions: there is water in the hot water tank and the water temperature is lower than the set temperature; operation mode: the compressor and the fan are powered on, and the first position of the four-way valve coil is disconnected; the hot water circulation pump is running, and the clean water is circulated for heating; the waste water pump is stopped, and the water source evaporator has no passage and does not participate in heat exchange; hot water flow control: according to the control of the hot water condenser inlet and outlet water temperature rise of about 5℃, adjust the circulating water volume;

[0009] Water source circulation, a loop circulation formed by the compressor, hot water condenser, second throttle, water source evaporator, four-way valve, compressor, gas-liquid separator, and compressor; starting condition: there is water in the wastewater pool; operation mode: the compressor, fan, and wastewater pump are powered on; the four-way valve coil is in the first position and has potential; the hot water circulation pump stops, the clean water is directly heated, and then heated again by the clean water-wastewater heat exchanger and the hot water condenser; the wastewater is operated for secondary heat recovery; control: the clean water flow and the wastewater flow are adjusted with the goal of the hot water condenser outlet water temperature rising to the set temperature;

[0010] The defrost cycle is a loop cycle connected by the compressor, four-way valve, air source evaporator, the third throttle, water source evaporator, four-way valve, gas-liquid separator, and compressor; the water source cycle also participates; activation conditions: 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; operation mode: the compressor, wastewater pump, and hot water circulation pump are powered on, the water inlet valve is closed, or the water inlet flow rate is reduced; the fan stops; the four-way valve coil is turned on in the first position; when the temperature difference of the air source evaporator tube wall temperature recovers to more than 5°C, it switches to the third heating mode.

[0011] The Fengshui dual-source cooperative circulation water heater is characterized in that the three circulation hot water making modes and the refrigerant flow, activation conditions and operation control of the defrosting cycle of the second dual-source water heater are respectively:

[0012] Air source circulation: It is a loop circulation formed by the compressor, hot water condenser, the first throttle, air source evaporator, gas-liquid separator and compressor; starting conditions: there is water in the hot water tank and the water temperature is lower than the set temperature; operation mode: the compressor and fan are powered on and the three-way valve is in the first position to cut off the potential; the hot water circulation pump is running and the clean water is circulated for heating; the waste water pump is stopped and the water source evaporator does not participate in heat exchange; hot water flow control: according to the control of the hot water condenser inlet and outlet water temperature rise of about 5°C, adjust the circulating water volume.

[0013] Dual-source series cycle: the refrigerant passes through the compressor and the hot water condenser, and the liquid is divided into two paths: the first path, through the first throttle; the second path, through the second throttle, the water source evaporator, the three-way valve ④③ path, at the outlet of the first throttle, the two refrigerant liquids merge, enter the wind source evaporator, the gas-liquid separator, and return to the compressor cycle; starting conditions: there is water in the wastewater pool; operation mode: the compressor, fan, and wastewater pump are powered on; the coil of the three-way valve is in the first position and the potential is cut off; the hot water circulation pump stops, the clean water is directly heated, and is heated again through the clean water-wastewater heat exchanger and the hot water condenser; the wastewater is operated with secondary heat recovery; control: with the goal of the hot water condenser outlet water temperature rising to the set temperature, adjust the clean water flow and wastewater flow; when the ambient temperature is higher than the wastewater discharge temperature of the water source evaporator, it is suitable to adopt a dual-source series cycle;

[0014] Double-source parallel circulation process: the refrigerant passes through the compressor and the hot water condenser, and the liquid is divided into two paths: the first path, through the first throttle, the air source evaporator; the second path, through the second throttle, the water source evaporator, and the three-way valve; at the second interface outlet of the air source evaporator, the two air flows converge, enter the gas-liquid separator, and return to the compressor; starting conditions: there is water in the wastewater pool; operation mode: the compressor, fan, and wastewater pump are powered on; the three-way valve is in the first position; the clean water is directly heated, and the hot water circulation pump is stopped; control: with the goal of the hot water condenser outlet water temperature rising to the set temperature, adjust the clean water flow and wastewater flow; when the ambient temperature is lower than or close to the wastewater discharge temperature of the water source evaporator, it is recommended to use double-source parallel circulation;

[0015] Defrosting method: Defrosting is done by using a dual-source series cycle process, that is, by increasing the wastewater flow rate and using the refrigerant gas with a higher temperature in the water source evaporator to defrost; in winter, the dual-source parallel and series cycle alternating operation modes are recommended.

[0016] The Feng Shui dual-source coordinated circulation water heater is characterized in that: the connection method of the wastewater heat recovery system is: the wastewater pool, wastewater pump, wastewater flow regulating valve, clean water-wastewater heat exchanger, and wastewater passage of the water source evaporator are connected in sequence with pipelines and finally discharged into the ditch; the heat exchangers for secondary heat recovery of wastewater are: clean water-wastewater heat exchanger and water source evaporator.

[0017] The wind and water dual-source cooperative circulation water heater is characterized in that: the fresh water heating system includes a direct heating passage and a circulating heating circuit; the direct heating passage is composed of a first water inlet valve, a water inlet check valve, a fresh water flow regulating valve, a fresh water-waste water heat exchanger, a hot water condenser, and a hot water tank connected in sequence by pipelines; the circulating heating circuit is a hot water circulating heating circuit formed by a hot water tank, a hot water circulation pump, and a hot water condenser connected by pipelines, a check valve is installed on the pipeline of the circulating water outlet of the hot water tank, and the second water inlet valve is plugged into the pipeline between the check valve outlet and the hot water circulation pump inlet; during the wind source circulation and defrost cycle, the fresh water circulation heating mode is operated; when wastewater heat recovery or dual-source combined circulation is adopted, the fresh water direct heating mode is operated.

[0018] The Feng Shui dual-source cooperative circulation water heater is characterized in that: the Feng Shui dual-source cooperative circulation water heater can be equipped with an additional water source secondary heat pump to form a Feng Shui dual-source cooperative circulation water heater with tertiary heat recovery of wastewater and tertiary heating of clean water; the water source secondary heat pump is composed of a secondary water source evaporator, a secondary hot water condenser, a second compressor and a fourth throttle; the pipeline flow of the tertiary heat recovery of wastewater is to connect the wastewater outlet of the water source evaporator to the wastewater channel inlet of the secondary water source evaporator, and finally discharge it into the ditch; the tertiary heat recovery of wastewater is only a function when the water source circulation is running; during the wind source circulation, the wastewater is recycled for secondary heat; the tertiary heating heat exchangers of the direct heating of clean water are in sequence: clean water-wastewater heat exchanger, secondary hot water condenser, hot water condenser, and finally the hot water enters the hot water tank.

[0019] The Fengshui dual-source cooperative circulation water heater is characterized in that the first and second throttles are preferably electronic expansion valves, followed by thermal expansion valves, and then capillaries.

[0020] The main innovative points of the utility model are: Dual-source combined cycle innovation The wind and water dual-source cooperative cycle water heater of the utility model is characterized in that: the refrigerant circuit of the wind and water dual-source cooperative cycle water heater is in the refrigeration system of a compressor, and three heat exchangers are configured: an air source evaporator, a water source evaporator and a hot water condenser, and a three-way valve and two throttles, or a four-way valve and three throttles are combined into a variety of circulation hot water making modes; the first dual-source water heater has a wind source, a water source separate circulation hot water making mode and a defrosting cycle using waste water heat; the second dual-source The water heater has wind source, dual-source series, and dual-source parallel cycle water heating modes; especially the dual-source parallel or dual-source series cycle, the wind source and water source evaporators jointly absorb heat, the amount of heat absorption increases, and the power output of the heat pump increases; due to the increase in the area of ​​the two evaporators, the heat transfer temperature difference is reduced when the evaporator absorbs heat, the irreversible loss of the heat pump is reduced, and the efficiency is improved; the parallel cycle can give full play to the respective advantages of evaporators with different temperature sources; the series cycle can adjust the system refrigerant flow, and alternating use can be used for defrosting, with good effect, which is a breakthrough innovation in the cycle of the dual-source heat pump water heater.

[0021] Structural innovation of dual-source parallel and series circulation loops The dual-source heat pump of the utility model, the first dual-source heat pump, uses a four-way valve and three throttles to construct two hot water heating cycles of wind source evaporator, water source cycle and hot water condenser, and also establishes a defrost cycle of water source evaporator and wind source evaporator when acting as condenser, replacing the reverse cycle of heat pump defrosting; the structural innovation is unique; the second dual-source heat pump, after comparing dozens of schemes, finally selected: three heating cycles composed of a three-way valve of a three-way two-position reversing valve and two throttles, with extremely simple structure and great functions, including wind source, dual-source series and dual-source parallel circulation modes; the design concept is: according to the wind source is a constant heat source and the wastewater source is an intermittent source, the wind source cycle is taken as the basic cycle, working throughout the process without control; and the combined cycle of water source and wind source is taken as an auxiliary cycle, intervened by the three-way valve; the reversal of the three-way valve changes the outlet air direction of the water source evaporator, realizing the switching of dual-source parallel and dual-source series cycles. These designs are breakthrough innovations of multi-evaporator and multi-cycle.

[0022] Operation scheme optimization is based on thermal analysis of variable operating conditions, and the performance of wastewater source and air source heat pumps are compared. According to the comparison between the ambient temperature and the wastewater discharge temperature of the water source evaporator, it is proposed to select dual-source parallel circulation when the air temperature is higher than the wastewater discharge temperature, so that the refrigerant passing through the water source evaporator can be superheated in the air source evaporator, thereby increasing the enthalpy value of the compressor intake air; when the air temperature is lower than or close to the wastewater temperature, the dual-source parallel circulation hot water making method is selected, which can give full play to the capacity of the dual-source evaporator to make hot water; when the temperature is in the range of ±5℃ in winter and frost is prone to occur, the dual-source parallel and series circulation are alternately circulated, and the refrigerant gas with a higher temperature of the water source evaporator can be used for defrosting. This is defrosting using wastewater heat, which is very economical.

[0023] The Feng Shui dual-source cooperative circulation water heater of the utility model can perform secondary heat recovery of bathing wastewater. The first time is to recover the wastewater heat through the temperature difference heat transfer of the clean water-wastewater heat exchanger, and the second time is to recover the bathing wastewater through the water source evaporator of the dual-source heat pump, which is of great benefit in winter when the temperature is low; the Feng Shui dual source can perform three-time wastewater heat recovery after combining with the secondary wastewater source heat pump, and the energy-saving benefit is more significant.

[0024] The energy-saving effect is remarkable. The wind and water dual-source cooperative circulation water heater of the utility model can flexibly and freely organize wind source circulation, dual-source parallel and series circulation, greatly improve the output power and efficiency of the heat pump, save equipment cost, and can produce hot water exceeding the amount of bathing wastewater to meet user needs. The annual average COP of hot water production is higher than 6, which is a new high-efficiency and energy-saving product.

[0025] According to the above 4 points, the Feng Shui dual-source collaborative circulation water heater of the utility model has original breakthroughs and innovations in system functions, system structures, circulation modes and their selection, etc., with outstanding novelty, obvious advancement and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 , is the wind and water dual-source cooperative circulation water heater described in the utility model, embodiment 1, a basic structure diagram of the first dual-source water heater and a principle illustration of the wind source circulation mode.

[0027] Figure 2 , is an illustration of the water source circulation mode of the first dual-source water heater in Example 1.

[0028] Figure 3 , is an illustration of the defrost cycle mode of the first dual-source water heater in Example 1.

[0029] Figure 4 , is Example 2, a schematic diagram of the basic structure of the second dual-source water heater and an explanatory diagram of the principle of the wind source circulation mode.

[0030] Figure 5 , is a principle illustration diagram of the dual-source series circulation mode of the second dual-source water heater in Example 2.

[0031] Figure 6 , is a diagram illustrating the principle of the dual-source parallel circulation mode of the second dual-source water heater in Example 2.

[0032] Figure 7 , is Example 3, which is the first dual-source water heater described in the utility model, a system structure diagram after combining a secondary wastewater source heat pump and a wastewater tertiary heat recovery process diagram.

[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 Fengshui dual-source cooperative circulation water heater described in the utility model is a first dual-source water heater, and its basic structure and working principle are the same as those of the first embodiment. Figure 1 , 2 , 3 common explanation; such as Figure 1 As shown, the first dual-source water heater comprises a dual-source heat pump, see Figure 1 The system connected by the thick black line; wastewater heat recovery system, see Figure 1 System connected by dotted line; fresh water heating system, see Figure 1 The system connected by the thick black line with arrows; the wastewater heat exchanger cleaning system is not shown in the figure;

[0035] The dual-source heat pump of the first dual-source water heater, i.e., the first dual-source heat pump, see Figure 1 , 2 3, is a dual-source heat pump composed of a compressor 1 and a hot water condenser H4, the first, second and third throttles J1, J2, J3, an air source evaporator H3, a water source evaporator H2, a four-way valve 2, and a gas-liquid separator 3;

[0036] The refrigerant circuit connection method of the first dual-source heat pump is shown in Figure 1 , 2 3. The air outlet of compressor 1 is divided into two paths, the first path is connected to the first inlet of four-way valve 2, and the second path is connected to the air inlet of hot water condenser H4; the liquid outlet of hot water condenser is connected in parallel with the first and second throttles J1 and J2, and the second interfaces of the first and second throttles are respectively connected to the first port liquid inlet of water source evaporator H3 and wind source evaporator H2; the first port liquid inlet of water source evaporator and wind source evaporator are interconnected by the third capillary throttle J3; the second and third interfaces of four-way valve 2 are respectively connected to the second interfaces of wind source evaporator and water source evaporator; the fourth interface of four-way valve is connected to the inlet of gas-liquid separator; the outlet of gas-liquid separator is connected to the air inlet of compressor; the connected circuit is filled with refrigerant.

[0037] The Fengshui dual-source cooperative circulation water heater is characterized in that the refrigerant flow, activation conditions and operation control of the three cycles of the first dual-source water heater are respectively:

[0038] Wind source circulation, see Figure 1, a loop formed by compressor 1, hot water condenser H4, first throttle J1, air source evaporator H3, four-way valve ②④ passage, gas-liquid separator 3, and compressor 1; starting conditions: there is water in hot water tank 4, and the hot water temperature is lower than the set temperature; operation mode: the compressor and fan 3a are powered on, and the first coil of the four-way valve 2 is disconnected, and the ②④ passage ④③ is disconnected; the hot water circulation pump B2 is running, and the clean water is circulated and heated; the waste water pump B1 is stopped, and the water source evaporator has no passage and does not participate in heat exchange; hot water flow control: according to the control of the hot water condenser inlet and outlet water temperature rise of about 5℃, adjust the circulating water volume;

[0039] Water cycle, see Figure 2 , a loop formed by compressor 1, hot water condenser H4, second throttle J2, water source evaporator H2, four-way valve ④③ passage, gas-liquid separator 3, and compressor 1; starting condition: there is water in wastewater pool 5; operation mode: compressor, fan, and wastewater pump are powered on; the second position of the four-way valve coil is connected to the potential ④③ passage; the hot water circulation pump is stopped, the clean water is directly heated, and then heated again by the clean water-wastewater heat exchanger and the hot water condenser; the wastewater is operated for secondary heat recovery; control: the clean water flow and the wastewater flow are adjusted with the goal of the outlet water temperature of the hot water condenser reaching the set temperature;

[0040] Defrost cycle, see Figure 3 , is a loop cycle formed by compressor 1, four-way valve ①② passages, air source evaporator, the third throttle J3, water source evaporator H2, four-way valve ④③ passages, gas-liquid separator 3, and compressor 1; the water source cycle is also involved; activation 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; operation mode: compressor 1, wastewater pump, and hot water circulation pump are powered on, the water inlet valve is closed, or the water inlet flow rate is reduced; the fan stops; the four-way valve coil is in the first position with potential (④③ passages); when the temperature difference of the air source evaporator pipe wall temperature recovers to more than 5°C, the normal hot water production cycle is restored.

[0041] The utility model of the wind and water dual-source cooperative circulation water heater, embodiment 2, the basic structure and working principle of the second dual-source water heater are as follows: Figure 4 , 5 , 6 common explanation; such as Figure 4 As shown, the Fengshui dual-source cooperative circulation water heater includes a dual-source heat pump, which is referred to as the second dual-source heat pump. Figure 4 The system connected by the thick black line; wastewater heat recovery system, see Figure 1 System connected by dotted line; fresh water heating system, see Figure 1 The system connected by the thick black line with arrows; the wastewater heat exchanger cleaning system is not shown in the figure;

[0042] Its basic structure and working principle are the same as those of Example 2. Figure 4 ,5 , 6 common explanation; such as Figure 4 As shown, the second dual-source water heater includes a dual-source heat pump, which is referred to as the second dual-source heat pump. The second dual-source heat pump is a dual-source heat pump composed of a compressor 1 and a hot water condenser H4, a first and a second throttle J1, J2, an air source evaporator H3, a water source evaporator H2, a three-way valve 2, and a gas-liquid separator 3; the first throttle J1 is an electronic expansion valve, and the second throttle J2 is a capillary tube; the three-way valve 2 has three interfaces, namely, left, middle, and right. The middle interface is an air inlet, and the left and right interfaces are both air outlets. It can be composed of a four-way valve. Valve modification; the second dual-source heat pump can organize three cycles to make hot water: air source cycle, dual-source series cycle, and dual-source parallel cycle; the air source evaporator H3 is installed alone outdoors, and the remaining components are installed indoors. It is a two-body one-system dual-source heat pump, see the dividing connecting stop valves C1 and C2 in the figure; the air source evaporator H3 is connected to the connecting stop valves C1 and C2 at the installation site through a movable connecting pipe. The connecting stop valves C1 and C2 are on the indoor body. When closed, the indoor circuit of the dual-source heat pump can be pre-filled with refrigerant in the factory.

[0043] The refrigerant circuit connection mode of the second dual-source heat pump in the embodiment is as follows: Figure 4 , 5 , 6; the air outlet of the compressor 1 is connected to the first interface air inlet of the hot water condenser H4 (the upper interface in the figure), and the second interface liquid outlet of the hot water condenser (the lower interface in the figure), and the liquid is divided into two paths, which are respectively connected to the first port inlet of the first and second throttles J1 and J2; the second ports of the first and second throttles are respectively connected to the first interfaces (liquid inlet when doing heat pump circulation) of the air source evaporator H3 and the water source evaporator H2; the second interface of the water source evaporator is connected to the middle air inlet interface of the three-way valve 2; the left air outlet interface of the three-way valve is connected to the first interface of the air source evaporator; the second interface of the air source evaporator (the right interface in the figure) and the right air outlet interface of the three-way valve 2 are jointly connected to the air inlet of the gas-liquid separator 4; the air outlet of the gas-liquid separator is connected to the air inlet of the compressor; the connected dual-source heat pump circulation loop is filled with refrigerant.

[0044] The wind and water dual-source cooperative circulation water heater is characterized in that: the second dual-source water heater has three circulation water-making modes: wind source circulation, dual-source series circulation, dual-source parallel circulation water-making mode and defrosting mode; its refrigerant flow, activation conditions and operation control are respectively:

[0045] Wind source circulation, see Figure 4, is a hot water making method that combines the air energy absorbed by the refrigerant in the wind source evaporator with the input work of the compressor; its refrigerant flow is: compressor 1, hot water condenser H4, first throttle J1, wind source evaporator H3, gas-liquid separator 3, compressor 1; starting conditions: there is water in the hot water tank, and the water temperature is lower than the set temperature; operation mode: the compressor, fan, and hot water circulation pump are running, and the three-way valve 2 is in the first position and the potential is ④② to open the circuit; hot water operation circulation heating mode; the wastewater pump is stopped, and the water source evaporator does not exchange heat; control: according to the inlet and outlet water temperature rise of about 5℃ of the hot water condenser, adjust the circulating water volume;

[0046] Dual source series cycle, see Figure 5 , is a dual-source series cycle in which part of the refrigerant throttled by the second throttle enters the water source evaporator and absorbs heat, then merges with the refrigerant throttled by the first throttle and enters the wind source evaporator to absorb heat again; its refrigerant flow is: compressor 1, hot water condenser H4, divided into two paths: the first path, through the first throttle J1, wind source evaporator 3a, gas-liquid separator 3, compressor 1; the second path, through the second throttle J2, water source evaporator H2, three-way valve ④③ passage, enter the first interface of the wind source evaporator H2, and the two refrigerant airflows merge at After the wind source evaporator absorbs heat and evaporates, the refrigerant vapor flows into the gas-liquid separator and returns to the compressor; starting condition: there is water in the wastewater pool 5; operation mode: the compressor, fan 3a, and wastewater pump B1 are powered on and running; the three-way valve is in the first position to cut off the potential ④③ passages; the clean water is directly heated, and the hot water circulation B2 pump is stopped; control: with the hot water condenser outlet water temperature rising to the set temperature, for example, 45°C as the target, adjust the clean water flow and wastewater flow; the clean water flow and wastewater flow are automatically controlled by the clean water flow regulating valves TF1 and TF2;

[0047] Double source parallel cycle, see Figure 6 , is the refrigerant that is diverted to the wind source and water source evaporator through the first and second throttles and absorbs heat together, which is a hot water circulation method; its refrigerant process is: compressor, hot water condenser H4, condensate is divided into two paths: the first path, through the first throttle, wind source evaporator; the second path, through the second throttle, water source evaporator, three-way valve ④② passage, the two gas paths are combined, enter the gas-liquid separator, and return to the compressor; starting condition: there is water in the wastewater pool; operation mode: the compressor, fan, and wastewater pump are powered on; the second position of the three-way valve 2 is connected to the potential ④② passage; the clean water is directly heated, and the hot water circulation pump is stopped; control: with the goal of the hot water condenser outlet water temperature rising to the set temperature, adjust the clean water flow and wastewater flow;

[0048] Defrosting method: defrosting using dual-source series cycle process, that is, by increasing the wastewater flow rate, using the refrigerant gas with higher temperature in the water source evaporator for defrosting; dual-source parallel and series cycle alternating operation modes are recommended in winter; starting conditions: the air source evaporator coil temperature is lower than minus 0°C, and the temperature difference with the ambient temperature suddenly increases and exceeds the set value, starting the defrost cycle; when the air source evaporator coil temperature is higher than 5-8°C, resume normal hot water circulation.

[0049] The signal detection and control system of the Fengshui dual-source cooperative circulation water heater of the utility model is shown in Figure 1-6 , including the initial wastewater temperature T 8 , Wastewater outlet temperature T of water source evaporator 10 , tap water inlet temperature T 1 , hot water outlet temperature T 4 , hot water tank water temperature T 5 , ambient temperature T 6 , air source evaporator tube wall temperature T 7 ; Detection of wastewater pool water level L, hot water tank water level, clean water and wastewater flow signal; installation of clean water and wastewater flow valves TF1 and TF2.

[0050] In embodiments 1 and 2, the wind and water dual-source cooperative circulation water heater, the connection method of the wastewater heat recovery system thereof, see Figure 1-6 : It is a wastewater passage consisting of a wastewater pool 5, a wastewater pump B1, a wastewater flow regulating valve TF2, a clean water-wastewater heat exchanger H1, and a water source evaporator H2, which are connected in sequence with pipes and finally discharged into the ditch; the heat exchangers for secondary heat recovery of wastewater are: clean water-wastewater heat exchanger and water source evaporator; in the former, the wastewater releases heat and heats the tap water inlet by temperature difference; in the latter, the wastewater heats the low-temperature refrigerant liquid of the water source evaporator, and then the refrigerant liquid evaporates into gas, carrying the heat absorbed by the wastewater and being compressed to a high temperature by the compressor, and then condenses and releases heat to hot water, so that the wastewater heat is fully utilized, especially in cold weather.

[0051] Embodiments 1 and 2, the wind and water dual-source cooperative circulation water heater, the fresh water heating system thereof, includes a direct heating passage and a circulating heating circuit; the direct heating passage is: composed of a first water inlet valve Z1, a water inlet check valve D1, a fresh water flow regulating valve TF1, a fresh water-waste water heat exchanger H1, a hot water condenser H4, and a hot water tank 5 connected in sequence by pipelines; the circulating heating circuit is: a hot water circulating heating circuit formed by a hot water tank 5, a hot water circulation pump B2, and a hot water condenser connected by pipelines, a check valve D2 is installed on the pipeline of the circulating water outlet of the hot water tank, and the second water inlet valve Z2 is plugged into the pipeline between the outlet of the check valve and the inlet of the hot water circulation pump; during the wind source circulation and defrost cycle, the fresh water circulation heating mode is operated; when wastewater heat recovery or dual-source combined circulation is enabled, the fresh water direct heating mode is operated.

[0052] See also Figure 7 , is the third embodiment of the Feng Shui dual-source cooperative circulation water heater described in the utility model, the first dual-source water heater, Figure 7 The double-dotted line A box in the middle shows the system of the first dual-source heat pump; the system structure diagram after adding the secondary wastewater source heat pump and the process diagram of the tertiary heat recovery of wastewater and the tertiary heating of clean water; Figure 6 As shown, the added water source secondary heat pump includes a compressor 6, a secondary hot water condenser H5, a third capillary throttle, a secondary water source evaporator H6, a gas-liquid separator 7, and a water source secondary heat pump circuit connected by pipelines. Figure 7 As shown in the double-dotted line B box; the wastewater tertiary heat recovery pipeline process is to connect the wastewater outlet of the water source evaporator H2 to the wastewater channel inlet of the secondary water source evaporator H6, and finally discharge it into the ditch; the three-heating heat exchangers of the clean water direct heating are in sequence: clean water-wastewater heat exchanger H1, secondary hot water condenser H5, hot water condenser H4, and finally the hot water enters the hot water tank; Figure 7 The example 3 shown is running the wind source cycle H3 + secondary heat recovery to make hot water H1 + H6. Although waste water passes through the water source heat exchanger H2, no refrigerant passes through it. Therefore, during the wind source + water source cycle, the waste water is heat recovered twice. When the wind source cycle stops and switches to the water source cycle, the waste water can be heat recovered three times, but the clean water is heated three times.

Claims

1. Fengshui dual-source cooperative circulation water heater, its characteristics are: It includes a dual-source heat pump, a wastewater heat recovery system, a clean water heating system, a wastewater heat exchanger cleaning system, and a signal detection and control system; the wastewater heat recovery system includes: a wastewater tank, a wastewater pump, a clean water-wastewater heat exchanger, and a water source evaporator; the clean water heating system includes a clean water-wastewater heat exchanger, a hot water condenser, a hot water tank, a water inlet valve, a hot water outlet valve, and a hot water circulation pump; the signal detection and control system includes the initial temperature of the wastewater, the wastewater outlet temperature of the water source evaporator, the tap water inlet temperature, the hot water outlet temperature, the hot water tank water temperature, the ambient air temperature, and the air source evaporator tube wall temperature; the wastewater tank water level, the hot water tank water level, the detection of the clean water and wastewater flow signals, and the start and stop of the compressor, fan, and wastewater pump according to the measured signals, and the flow adjustment of clean water and wastewater; the dual-source heat pump is composed of a compressor, a hot water condenser, an air source evaporator, a water source evaporator, a fluorine circuit control valve, a throttle, and a gas-liquid separator; the dual There are two structural modes of dual-source heat pumps, which are respectively recorded as the first and the second dual-source heat pumps; the first dual-source heat pump, its fluorine circuit control valve is a four-way valve, and its throttles include the first, second and third throttles; the second dual-source heat pump, its fluorine circuit control valve is a three-way valve, and the three-way valve has three interfaces: left, middle and right, the middle interface is the air inlet, and the left and right interfaces are both air outlets; its throttles include the first and the second throttles; the wind and water dual-source coordinated circulation water heater composed of the first dual-source heat pump is called the first dual-source water heater, which can organize the wind source and water source to circulate separately to make hot water and use wastewater heat for defrosting; the wind and water dual-source coordinated circulation water heater composed of the second dual-source heat pump is called the second dual-source water heater, which can organize the wind source and dual sources in parallel, the dual sources in series to circulate to make hot water, and can use wastewater heat for defrosting through the dual sources in series; the wind source evaporators of the first and second dual-source water heaters are all installed separately outdoors, and the remaining components are installed indoors, which are a two-body dual-source water heater in one system.

2. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The refrigerant circuit connection method of the first dual-source heat pump is: the compressor outlet is divided into two paths, the first path is connected to the first inlet of the four-way valve, and the second path is connected to the air inlet of the hot water condenser; the liquid outlet of the hot water condenser is connected in parallel with the first and second throttles, and the second interfaces of the first and second throttles are respectively connected to the first port liquid inlet of the air source evaporator and the water source evaporator; the first port of the water source evaporator and the air source evaporator are interconnected by the third capillary throttle; the second and third interfaces of the four-way valve are respectively connected to the second interfaces of the air source evaporator and the water source evaporator; the fourth interface of the four-way valve is connected to the inlet of the gas-liquid separator; the outlet of the gas-liquid separator is connected to the air inlet of the compressor; the connected circuit is filled with refrigerant.

3. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The refrigerant circuit connection method of the second dual-source heat pump is: the air outlet of the compressor is connected to the first interface air inlet of the hot water condenser, and the second interface liquid outlet of the hot water condenser is divided into two paths, which are respectively connected to the first port inlet of the first and second throttles; the second ports of the first and second throttles are respectively connected to the first interfaces of the air source evaporator and the water source evaporator; the second interface of the water source evaporator is connected to the middle air inlet interface of the three-way valve; the left air outlet interface of the three-way reversing valve is connected to the first interface of the air source evaporator; the second interface of the air source evaporator and the right air outlet interface of the three-way valve are jointly connected to the air inlet of the gas-liquid separator; the air outlet of the gas-liquid separator is connected to the air inlet of the compressor; the connected dual-source heat pump circulation circuit is filled with refrigerant.

4. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The refrigerant flow, activation conditions, and operation control of the three hot water production cycles of the first dual-source water heater are as follows: Air source circulation: It is a loop circulation formed by the compressor, hot water condenser, the first throttle, the air source evaporator, the four-way valve, the gas-liquid separator, and the compressor; starting conditions: there is water in the hot water tank, and the hot water temperature is lower than the set temperature; operation mode: the compressor and the fan are powered on, and the four-way valve coil is disconnected; the hot water circulation pump is running, and the clean water is circulated and heated; the waste water pump is stopped, and the water source evaporator has no passage and does not participate in heat exchange; hot water flow control: according to the control of the hot water condenser inlet and outlet water temperature rise of about 5℃, adjust the circulating water volume; Water source circulation: It is a loop circulation formed by the compressor, hot water condenser, second throttle, water source evaporator, four-way valve, gas-liquid separator and compressor; starting condition: there is water in the wastewater pool; operation mode: the compressor, fan and wastewater pump are powered on; the four-way valve coil is powered on; the hot water circulation pump is stopped, the clean water is directly heated, and then heated again by the clean water-wastewater heat exchanger and the hot water condenser; the wastewater is operated with secondary heat recovery; Control: Adjust the clean water flow and waste water flow with the goal of raising the outlet water temperature of the hot water condenser to the set temperature; The defrost cycle is a loop formed by the compressor, four-way valve, air source evaporator, the third throttle, water source evaporator, four-way valve, gas-liquid separator, and compressor; the water source cycle also participates; activation conditions: 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; operation mode: the compressor, wastewater pump, and hot water circulation pump are powered on, the water inlet valve is closed, or the water inlet flow rate is reduced; the fan is stopped; the four-way valve coil is energized; when the temperature difference of the air source evaporator tube wall temperature recovers to more than 5°C, it is switched to the third heating mode.

5. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The three circulation hot water making modes and the refrigerant flow, activation conditions, and operation control of the defrosting cycle of the second dual-source water heater are respectively: Air source circulation: It is a loop circulation formed by the compressor, hot water condenser, the first throttle, the air source evaporator, the gas-liquid separator, and the compressor; starting conditions: there is water in the hot water tank and the water temperature is lower than the set temperature; operation mode: the compressor and the fan are powered on, and the three-way valve coil is powered off; the hot water circulation pump is running, and the clean water is circulated and heated; the waste water pump is stopped, and the water source evaporator does not participate in heat exchange; hot water flow control: according to the control of the hot water condenser inlet and outlet water temperature rise of about 5℃, adjust the circulating water volume; Double-source series cycle: The refrigerant passes through the compressor and hot water condenser, and the liquid is divided into two paths: the first path passes through the first throttle; The second path passes through the second throttle, the water source evaporator, the three-way valve, and the outlet of the first throttle. The two paths of refrigerant liquid merge and enter the air source evaporator, the gas-liquid separator, and return to the compressor cycle; Starting conditions: There is water in the wastewater pool; Operation mode: The compressor, fan, and wastewater pump are powered on; The three-way valve coil is powered off; The hot water circulation pump stops, the clean water is directly heated, and then reheated through the clean water-waste water heat exchanger and the hot water condenser; the waste water secondary heat recovery operation; Control: Adjust the clean water flow and waste water flow with the goal of raising the outlet water temperature of the hot water condenser to the set temperature; When the ambient temperature is higher than the wastewater discharge temperature of the water source evaporator, it is suitable to adopt a dual-source series cycle; Double-source parallel cycle process: The refrigerant passes through the compressor and hot water condenser, and the liquid is divided into two paths: the first path passes through the first throttle and the air source evaporator; The second route, through the second throttle, water source evaporator, three-way valve; at the second interface outlet of the air source evaporator, the two air flows converge, enter the gas-liquid separator, and return to the compressor; starting conditions: there is water in the wastewater pool; operation mode: the compressor, fan, and wastewater pump are powered on; the three-way valve coil is powered on; the clean water is directly heated, and the hot water circulation pump is stopped; Control: With the goal of raising the outlet water temperature of the hot water condenser to the set temperature, adjust the clean water flow and wastewater flow; when the ambient temperature is lower than or close to the wastewater discharge temperature of the water source evaporator, it is recommended to use dual-source parallel circulation; Defrosting method: Defrosting by dual-source series cycle, that is, by increasing the wastewater flow rate, using the refrigerant gas with higher temperature in the water source evaporator for defrosting; in winter, the dual-source parallel and series cycle alternating operation modes are recommended.

6. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The connection method of the wastewater heat recovery system is: the wastewater pool, wastewater pump, wastewater flow regulating valve, clean water-wastewater heat exchanger, and wastewater passage of the water source evaporator are connected in sequence with pipelines and finally discharged into the ditch; the heat exchangers for secondary heat recovery of wastewater are: clean water-wastewater heat exchanger and water source evaporator.

7. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The clean water heating system comprises a direct heating passage and a circulating heating circuit; the direct heating passage is composed of a first water inlet valve, a water inlet check valve, a clean water flow regulating valve, a clean water-waste water heat exchanger, a hot water condenser and a hot water tank connected in sequence by pipelines; the circulating heating circuit is a hot water circulating heating circuit formed by a hot water tank, a hot water circulating pump and a hot water condenser connected by pipelines, a check valve is installed on the pipeline of the circulating water outlet of the hot water tank, and the second water inlet valve is plugged into the pipeline between the check valve outlet and the hot water circulating pump inlet; during the air source circulation and defrost circulation, the clean water circulating heating mode is operated; when waste water heat recovery or dual-source combined circulation is adopted, the clean water direct heating mode is operated.

8. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The Feng Shui dual-source cooperative circulation water heater described above can be equipped with an additional water source secondary heat pump to form a Feng Shui dual-source cooperative circulation water heater with tertiary heat recovery of wastewater and tertiary heating of clean water by direct heating; the water source secondary heat pump is composed of a secondary water source evaporator, a secondary hot water condenser, a second compressor and a fourth throttle; the pipeline flow of the tertiary heat recovery of wastewater is to connect the wastewater outlet of the water source evaporator to the wastewater channel inlet of the secondary water source evaporator, and finally discharge it into the ditch; the tertiary heat recovery of wastewater is only a function when the water source circulation is in operation; during the wind source circulation, the wastewater is recycled for secondary heat; the tertiary heating heat exchangers of the direct heating of clean water are in the following order: clean water-wastewater heat exchanger, secondary hot water condenser, hot water condenser, and finally the hot water enters the hot water tank.

9. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The first dual-source water heater adopts air source circulation when the ambient temperature is higher than the wastewater discharge temperature of the water source evaporator; the second dual-source water heater selects wind source circulation when there is no wastewater; when the ambient temperature is lower than or equal to the wastewater discharge temperature of the water source evaporator, dual-source parallel circulation is adopted; when the ambient temperature is higher than the wastewater discharge temperature of the water source evaporator, dual-source series circulation is adopted; when frosting occurs on the air source evaporator, dual-source series circulation is adopted for defrosting.

10. The Feng Shui dual-source cooperative circulation water heater according to claim 1 is characterized in that: The first and second throttles can be electronic expansion valves, thermal expansion valves, or capillary tubes.

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