System for producing domestic hot water by combining bathing wastewater source and ground source

Abstract

The present invention discloses a system for preparing domestic hot water by combining a bathing wastewater source with a ground source. The water inlet A and water inlet B, the water outlet A and water outlet B of the heat exchanger are connected to the clean water inlet pipe A and the waste water outlet pipe, the clean water primary heat pipe and the waste water primary cooling pipe respectively. The clean water primary heat pipe is connected to the condensation water inlet A, the condensation water outlet A is connected to the condensation water inlet B through the clean water heat pipe, the condensation water outlet B is connected to the hot water storage tank, the waste water primary cooling pipe is connected to the evaporation water inlet A, the evaporation water outlet A is connected to the evaporation water inlet B through the waste water cold pipe, and the evaporation water outlet B is connected to the waste water drain pipe; the clean water inlet pipe A is connected to the electromagnetic valve A and the buried pipe A in parallel, and the waste water cold pipe is connected to the electromagnetic valve B and the buried pipe B in parallel. From the above structure, it can be seen that the system for preparing domestic hot water by combining a bathing wastewater source with a ground source of the present invention can prepare not only bathing hot water but also all domestic hot water required for washing vegetables, hands and face in the kitchen and bathroom using bathing wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of recycling waste heat to produce domestic hot water in an energy-saving manner, and in particular to a system for producing domestic hot water by combining a bathing wastewater source with a ground source. Background Art

[0002] The applicant previously applied for and submitted a patent with application number 201910362566.1, which cleverly combined the use of bathing wastewater sources with ground sources, and obtained hot water for bathing by heating the bathing wastewater in a 1:1 ratio, with good heating effect and low energy consumption. However, in actual use, it was found that it can operate normally in spring, summer and autumn throughout the year, but in winter, the use effect is relatively poor. Research has found that this is because the tap water temperature in winter is lower than that in the other three seasons, and the temperature required for hot water for bathing is also slightly higher than that in the other three seasons, resulting in the temperature rise required to heat clean water to hot water being higher than that in the other three seasons, which results in the final water outlet temperature being unable to meet the bathing requirements. In addition, in addition to bathing in winter, there is also a rigid demand for other domestic hot water, and the amount of domestic hot water used exceeds the discharge of bathing wastewater.

[0003] Simply using the system of the above patent to produce domestic hot water from bathing wastewater, when the tap water temperature is particularly low in the cold winter, even if the heat in the bathing wastewater is recovered to the maximum extent, it cannot meet the temperature rise requirements of domestic hot water. Auxiliary heating equipment must be used for heating. Although auxiliary heating accounts for a small proportion of the total heating, it still brings more inconvenience to the overall operation and significantly reduces the performance coefficient of the system. For example, electric auxiliary heating will seriously increase the overall operating energy consumption of the equipment, and an additional set of electric auxiliary heating equipment is required for operation and maintenance, which adds additional costs; ordinary ground source heat pump systems require a large number of buried pipes during construction, and the buried pipes must be kept at a sufficient distance, so the overall area is large and the on-site conditions are not easy to meet. In actual operation, due to the low ground source temperature, the system performance coefficient is not high, and it is also very easy to have ground source heat imbalance, and long-term operation cannot be guaranteed.

[0004] In addition, when the system of the above patent is used for the first time, hot water must be obtained through the auxiliary heating system for bathing before bathing waste water can be obtained to operate the system.

[0005] Therefore, how to use it without auxiliary heating system under any working conditions throughout the year, and how to produce more hot water than bathing wastewater in winter are technical problems that technicians in this field need to solve urgently. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a system for producing domestic hot water by combining a bathing wastewater source with a ground source, which can achieve an outstanding effect of a ratio of clean water to wastewater flow rate ≥ 1:1 under various working conditions throughout the year without the need for other hot water equipment. Bathing wastewater can be used to produce not only bathing hot water but also all domestic hot water required for washing vegetables, hands and face in the kitchen and bathroom. Compared with ordinary ground source heat pump systems, the temperature of the bathing wastewater source is significantly higher than the ground source temperature, and wastewater and clean water directly exchange heat in the heat exchanger, so that the system heating capacity and performance coefficient can be increased by about 50%; a two-stage heat pump system is used to completely recover waste heat in the wastewater, and only the heat energy in the wastewater can be used most of the year. The clean water is heated to the required temperature for bathing. The buried pipe is used to absorb heat from the ground source only when the tap water temperature is particularly low. It is only used as an auxiliary heat source in winter, with a small amount of use and does not work most of the time, which will not cause thermal imbalance of the ground source. When replenishing heat energy from the ground source, clean water or bathing wastewater is used as the medium, and the heat pump structure of bathing wastewater hot water is not changed. Only the buried pipe is added. The dual-source shared cascade utilizes the heat pump component, and the system is streamlined. When the solenoid valve is opened, the water passes through the solenoid valve in a very short path. In addition, the valve has a large diameter, and its pipeline resistance is much smaller than that of the buried pipe. Clean water or wastewater passes over the buried pipe and directly enters the next level. When the solenoid valve is closed, clean water or wastewater is forced to enter the buried pipe to absorb heat. The ground source switching is controlled by only one valve, which is simple and reliable. Compared with ordinary ground source heat pump units with the same heating capacity, the length of the buried pipe required for this method is less.

[0007] The technical solution adopted by the present invention is:

[0008] A system for producing domestic hot water by combining a bathing wastewater source with a ground source comprises a heat exchanger, wherein the water inlet end A and the water inlet end B of the heat exchanger are respectively connected to a clean water inlet pipe A and a wastewater outlet pipe of a bathing wastewater storage tank, and the water outlet end A and the water outlet end B of the heat exchanger are respectively connected to a clean water primary heating pipe and a wastewater primary cooling pipe, and the wastewater storage tank is connected to the bathing wastewater pipe; the clean water primary heating pipe is connected to a condensation water inlet end A of a condenser A of a heat pump A, and the condensation water outlet end A of the condenser A is connected to a condensation water inlet end B of a condenser B of a heat pump B through a clean water heat pipe, and the condensation of the condenser B The water outlet B is connected to the hot water storage tank through a clean water end heat pipe, and a hot water outlet pipe is also provided at the bottom of the hot water storage tank. The waste water primary cooling pipe is connected to the evaporation water inlet A of the evaporator B of the heat pump B, and the evaporation water outlet A of the evaporator B is connected to the evaporation water inlet B of the evaporator A of the heat pump A through a waste water intercooling pipe, and the evaporation water outlet B of the evaporator A is connected to the waste water drain pipe; an underground pipe is connected in parallel to the clean water inlet pipe A or the waste water intercooling pipe, and an electromagnetic valve is also provided at the position between the corresponding clean water inlet pipe A or the waste water intercooling pipe corresponding to the connection end of the buried pipe.

[0009] A further improvement of the present invention is that a wastewater supply pump is connected to the wastewater outlet pipe, and the wastewater supply pump pumps the bathing wastewater in the wastewater storage tank to the water inlet end B of the heat exchanger.

[0010] A further improvement of the present invention is that the ratio of the liquid inlet flow rate of the clean water inlet pipe A entering the heat exchanger to the liquid inlet flow rate of the waste water outlet pipe entering the heat exchanger is in the range of 1.0 to 1.4:1.

[0011] A further improvement of the present invention is that the condenser A and the evaporator A of the heat pump A are circulated and connected via a refrigerant pipe A, and the refrigerant pipe A is also connected to a compressor A and a throttle valve A. After flowing out of the compressor A, the medium A in the refrigerant pipe A passes through the condenser A, the throttle valve A and the evaporator A in sequence, and then flows back to the compressor A again.

[0012] A further improvement of the present invention is that the condenser B and the evaporator B of the heat pump B are circulated and connected via a refrigerant pipe B, and the refrigerant pipe B is also connected to a compressor B and a throttle valve B. After flowing out of the compressor B, the medium B in the refrigerant pipe B passes through the condenser B, the throttle valve B and the evaporator B in sequence, and then flows back to the compressor B.

[0013] A further improvement of the present invention is that the bathing waste water pipe is connected to the top of the waste water storage tank, and the waste water outlet pipe is connected to the bottom of the side wall of the waste water storage tank.

[0014] A further improvement of the present invention is that the fresh water end heat pipe is connected to the top of the side wall of the hot water storage tank, and the hot water outlet pipe is connected to the bottom of the side wall of the hot water storage tank.

[0015] A further improvement of the present invention is that when an underground pipe is connected in parallel to the waste water cold pipe: a clean water circulation pipe is connected between the hot water storage tank and the clean water hot pipe, and a circulation pump A is connected to the clean water circulation pipe. The circulation pump A pumps water in the hot water storage tank to the clean water hot pipe, and a valve A is provided on the clean water hot pipe, between the condenser A and the connection point of the clean water hot pipe corresponding to the clean water circulation pipe, and the hot water storage tank is also connected to a clean water inlet pipe B, and a valve B is provided on the clean water inlet pipe B.

[0016] A further improvement scheme of the present invention is that the wastewater primary cooling pipe is also connected to a clean water inlet pipe C, and a circulating pump B is also connected on the wastewater primary cooling pipe between the evaporator B and the clean water inlet pipe C. The circulating pump B pumps the bathing wastewater in the wastewater primary cooling pipe to the evaporator B. A wastewater circulation pipe is also connected between the wastewater intermediate cooling pipe and the wastewater primary cooling pipe. One end of the wastewater circulation pipe is connected to the wastewater intermediate cooling pipe at a position between the connection point of the water outlet end of the buried pipe B and the evaporator A, and the other end of the wastewater circulation pipe is connected to the wastewater primary cooling pipe at a position between the water outlet end B of the heat exchanger and the connection point corresponding to the clean water inlet pipe C. A valve C is provided on the wastewater primary cooling pipe between the water outlet end B of the heat exchanger and the connection point corresponding to the wastewater circulation pipe, a valve D is provided on the wastewater intermediate cooling pipe between the evaporator A and the connection point corresponding to the wastewater circulation pipe, a valve E is connected to the clean water inlet pipe C, and a valve F is connected to the wastewater circulation pipe. A further improvement of the present invention is that a valve G is provided on the clean water circulation pipe, between the hot water storage tank and the circulation pump A.

[0017] A further improvement of the present invention is that the clean water inlet pipe B is connected to the top of the side wall of the hot water storage tank, and the clean water circulation pipe is connected to the bottom of the side wall of the hot water storage tank.

[0018] A further improvement of the present invention is that when an underground pipe is connected in parallel to the clean water inlet pipe A, the underground pipe A is connected in parallel to the clean water inlet pipe A, and the two ends of the buried pipe A are respectively connected to the two end positions of the clean water inlet pipe A corresponding to the solenoid valve A; when an underground pipe is connected in parallel to the wastewater cooler pipe, an solenoid valve B is connected to the wastewater cooler pipe, and the underground pipe B is connected in parallel to the wastewater cooler pipe, and the two ends of the buried pipe B are respectively connected to the two end positions of the wastewater cooler pipe corresponding to the solenoid valve B.

[0019] A further improvement of the present invention is:

[0020] The beneficial effects of the present invention are:

[0021] First, the system of the present invention for producing domestic hot water by combining a bathing wastewater source with a ground source can achieve an outstanding effect of a ratio of clean water to wastewater flow rate ≥ 1:1 under various working conditions throughout the year without the need for other hot water equipment. Bathing wastewater can be used not only to produce bathing hot water but also to produce all the domestic hot water required for washing vegetables, hands and face in the kitchen and bathroom.

[0022] Secondly, compared with the common ground source heat pump system, the bathing wastewater source temperature of the system of the present invention which combines the bathing wastewater source with the ground source to produce domestic hot water is significantly higher than the ground source temperature, and the wastewater and clean water directly exchange heat in the heat exchanger, so that the system heating capacity and performance coefficient can be increased by about 50%.

[0023] Thirdly, the system of the present invention for producing domestic hot water by combining a bathing wastewater source with a ground source has a two-stage heat pump system, so that waste heat in the wastewater can be completely recovered. Most of the time throughout the year, clean water can be heated to the temperature required for bathing by using only the heat energy in the wastewater. Only when the tap water temperature is particularly low, the buried pipe is used to absorb heat from the ground source. It is only used as an auxiliary heat source in winter, with a small amount of usage and is not working most of the time, which will not cause thermal imbalance of the ground source.

[0024] Fourthly, the system of the present invention combines a bathing wastewater source with a ground source to produce domestic hot water. When supplementing heat energy from the ground source, clean water or bathing wastewater is used as the medium. The heat pump structure for producing hot water from bathing wastewater is not changed. Only buried pipes are added. The dual sources share a cascade utilization heat pump component, and the system is streamlined.

[0025] Fifth, in the system of the present invention, a bathing wastewater source and a ground source are combined to produce domestic hot water. When the solenoid valve is opened, the path of water passing through the solenoid valve is extremely short. In addition, the valve diameter is large, and the pipeline resistance is much smaller than that of the buried pipe. Clean water or wastewater passes over the buried pipe and directly enters the next level. When the solenoid valve is closed, clean water or wastewater is forced to enter the buried pipe. The system absorbs heat from both the wastewater and the ground source. The ground source switching is controlled by only one valve, which is simple and reliable.

[0026] Sixth, the system of the present invention for producing domestic hot water by combining a bathing wastewater source with a ground source requires less length of buried pipes than ordinary ground source heat pump units with the same heating capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the invention.

[0028] Figure 2 This is a data table of Example 1 of the present invention.

[0029] Figure 3 This is a data table of Example 2 of the present invention.

[0030] Figure 4 This is a data table of Example 3 of the present invention.

[0031] Figure 5 This is a data table of Example 4 of the present invention.

[0032] Figure 6 This is a data table of Example 5 of the present invention.

[0033] Figure 7 It is the COP curve diagram of Examples 1 to 5 of the present invention. DETAILED DESCRIPTION

[0034] like Figure 1It can be seen that the system for producing domestic hot water by combining a bathing wastewater source with a ground source includes a heat exchanger 4, wherein the water inlet end A and the water inlet end B of the heat exchanger 4 are respectively connected to the clean water inlet pipe A1 and the wastewater outlet pipe 16 of the bathing wastewater storage tank 14, and the water outlet end A and the water outlet end B of the heat exchanger 4 are respectively connected to the clean water primary heat pipe 5 and the wastewater primary cooling pipe 17, and the wastewater storage tank 14 is connected to the bathing wastewater pipe 13; the clean water primary heat pipe 5 is connected to the condensation water inlet end A of the condenser A7 of the heat pump A, and the condensation water outlet end A of the condenser A7 is connected to the condensation water inlet end B of the condenser B10 of the heat pump B through the clean water heat pipe 20, and the condensation of the condenser B10 is connected to the condensation water outlet end A of the condenser B10 of the heat pump B. The water outlet B is connected to the hot water storage tank 11 through the clean water end heat pipe 41, and a hot water outlet pipe 12 is also connected to the bottom of the hot water storage tank 11. The waste water primary cooling pipe 17 is connected to the evaporation water inlet A of the evaporator B21 of the heat pump B. The evaporation water outlet A of the evaporator B21 is connected to the evaporation water inlet B of the evaporator A26 of the heat pump A through the waste water intercooling pipe 22, and the evaporation water outlet B of the evaporator A26 is connected to the waste water drain pipe 27; the clean water inlet pipe A1 or the waste water intercooling pipe 22 is connected in parallel with an underground pipe, and the corresponding clean water inlet pipe A1 or the waste water intercooling pipe 22 is also provided with an electromagnetic valve at the position between the connecting ends of the buried pipes.

[0035] The wastewater outlet pipe 16 is connected to a wastewater supply pump 15 , and the wastewater supply pump 15 pumps the bathing wastewater in the wastewater storage tank 14 to the water inlet end B of the heat exchanger 4 .

[0036] The ratio of the liquid inlet flow rate of the clean water inlet pipe A1 entering the heat exchanger 4 to the liquid inlet flow rate of the waste water outlet pipe 16 entering the heat exchanger 4 is in the range of 1.0 to 1.4:1.

[0037] The condenser A7 and the evaporator A26 of the heat pump A are circulated and connected via a refrigerant pipe A6, and a compressor A28 and a throttle valve A29 are also connected to the refrigerant pipe A6. After flowing out of the compressor A28, the medium A in the refrigerant pipe A6 passes through the condenser A7, the throttle valve A29 and the evaporator A26 in sequence, and then flows back to the compressor A28.

[0038] The condenser B10 and the evaporator B21 of the heat pump B are circulated and connected via a refrigerant pipe B9, and a compressor B30 and a throttle valve B31 are also connected to the refrigerant pipe B9. After flowing out of the compressor B30, the medium B in the refrigerant pipe B9 passes through the condenser B10, the throttle valve B31 and the evaporator B21 in sequence, and then flows back to the compressor B30 again.

[0039] The bathing waste water pipe 13 is connected to the top of the waste water storage tank 14 , and the waste water outlet pipe 16 is connected to the bottom of the side wall of the waste water storage tank 14 .

[0040] The clean water end heat pipe 41 is connected to the top of the side wall of the hot water storage tank 11 , and the hot water outlet pipe 12 is connected to the bottom of the side wall of the hot water storage tank 11 .

[0041] When the wastewater cooler pipe 22 is connected in parallel with an underground pipe: a clean water circulation pipe 38 is connected between the hot water storage tank 11 and the clean water heat pipe 20, and a circulation pump A39 is connected to the clean water circulation pipe 38. The circulation pump A39 pumps the water in the hot water storage tank 11 to the clean water heat pipe 20. A valve A8 is provided on the clean water heat pipe 20, between the condenser A7 and the clean water heat pipe 20 corresponding to the connection point of the clean water circulation pipe 38. The hot water storage tank 11 is also connected with a clean water inlet pipe B36, and a valve B37 is provided on the clean water inlet pipe B36.

[0042] The wastewater primary cooling pipe 17 is also connected to a clean water inlet pipe C32, and a circulating pump B19 is also connected on the wastewater primary cooling pipe 17 between the evaporator B21 and the clean water inlet pipe C32. The circulating pump B19 pumps the bathing wastewater in the wastewater primary cooling pipe 17 to the evaporator B21. A wastewater circulation pipe 34 is also connected between the wastewater intermediate cooling pipe 22 and the wastewater primary cooling pipe 17. One end of the wastewater circulation pipe 34 is connected to the wastewater intermediate cooling pipe 22, which is located between the connection point of the water outlet end of the buried pipe B24 and the evaporator A26. The other end of 34 is connected to the waste water primary cooling pipe 17 at a position located between the water outlet end B of the heat exchanger 4 and the connection corresponding to the clean water inlet pipe C32. A valve C18 is provided on the waste water primary cooling pipe 17 between the water outlet end B of the heat exchanger 4 and the connection corresponding to the waste water circulation pipe 34. A valve D25 is provided on the waste water intercooling pipe 22 between the evaporator A26 and the connection corresponding to the waste water circulation pipe 34. A valve E33 is provided on the clean water inlet pipe C32. A valve F35 is provided on the waste water circulation pipe 34.

[0043] A valve G40 is also provided on the clean water circulation pipe 38, between the hot water storage tank 11 and the circulation pump A39.

[0044] The clean water inlet pipe B36 is connected to the top of the side wall of the hot water storage tank 11, and the clean water circulation pipe 38 is connected to the bottom of the side wall of the hot water storage tank 11.

[0045] When an underground pipe is connected in parallel to the clean water inlet pipe A1, the underground pipe A3 is connected in parallel to the clean water inlet pipe A1, and the two ends of the buried pipe A3 are respectively connected to the two end positions of the clean water inlet pipe A1 corresponding to the solenoid valve A2; when an underground pipe is connected in parallel to the wastewater cooler pipe 22, an solenoid valve B23 is connected to the wastewater cooler pipe 22, and the underground pipe B24 is connected in parallel to the wastewater cooler pipe 22, and the two ends of the buried pipe B24 are respectively connected to the two end positions of the wastewater cooler pipe 22 corresponding to the solenoid valve B23.

[0046] When the present application is used for the first time, first open valve B37 respectively, fill the hot water storage tank 11 with clean water through the clean water inlet pipe B36, open valve E33 and valve F35 at the same time, and keep the solenoid valve B23 closed, so that the clean water in the clean water inlet pipe C32 fills the loop formed by the wastewater primary cooling pipe 17, the evaporator B21, the wastewater cold pipe 22, the buried pipe B24 and the wastewater circulation pipe 34; then close valve B37 and valve E33, keep valve A8, valve C18 and valve D25 closed, open valve G40 at the same time, keep valve F35 open, and start the circulation pump A39 and circulation pump B19, so that the clean water in the hot water storage tank 11 passes through the circulation pump A39 of the clean water circulation pipe 38, the clean water mid-heat pipe 22 and the wastewater circulation pipe 34 in sequence. 20. After the condenser B10 and the clean water end heat pipe 41, it circulates back to the hot water storage tank 11, and the clean water in the wastewater primary cooling pipe 17 is successively passed through the circulation pump B19, the evaporator B21, the buried pipe 24 of the wastewater neutralizing pipe 22, and the wastewater circulation pipe 34, and then circulates back to the wastewater primary cooling pipe 17; because the clean water in the buried pipe 24 can absorb the heat in the soil and be heated, the clean water circulating into the wastewater primary cooling pipe 17 can continue to release heat to the medium B through the evaporator B2 each time, and then the medium B that absorbs the heat of the clean water in the wastewater primary cooling pipe 17 continuously releases heat to the clean water in the clean water heat pipe 20 through the condenser B10, so that the water in the hot water storage tank 11 is gradually heated to be suitable for domestic hot water or bathing.

[0047] When the hot water in the hot water storage tank 11 can be discharged through the hot water outlet pipe 12 to meet the needs of domestic hot water or bathing water, the discharged bathing waste water can be discharged into the waste water storage tank 14 through the bathing waste water pipe 13; open valve A8, valve C18 and valve D25, close valve F35, valve G40, waste water supply pump 15 and circulation pump A39, and then keep valve B37, circulation pump B19, valve E33, solenoid valve A2 and solenoid valve B23 closed; so that The clean water in the clean water inlet pipe A1 is first preheated by absorbing heat from the soil through the buried pipe A3, and then the clean water is first heat-exchanged with the bathing wastewater discharged from the wastewater storage tank 14 through the heat exchanger 4, so that the bathing wastewater enters the wastewater primary cooling pipe 17 after the initial cooling, and enters the clean water primary heating pipe 5 after the initial heating, and then the clean water in the clean water primary heating pipe 5 realizes the second heat exchange with the condenser A7 of the heat pump A and enters the clean water heat exchange pipe 20, and the clean water in the clean water heat exchange pipe 20 and the condenser B of the heat pump B are heated to a high temperature. 10 After the third heat exchange, the clean water final heat pipe 41 enters the hot water storage tank 11 for standby use; and the bathing wastewater in the wastewater primary cooling pipe 17 enters the evaporator B21 of the heat pump B through the circulating pump 19 to realize the second heat exchange and then enters the wastewater neutralizing pipe 22. At this time, the temperature of the bathing wastewater after the second heat exchange has dropped to about 5 degrees Celsius. If the bathing wastewater is directly heat-exchanged again through the evaporator A26 of the heat pump A, the evaporation outlet B corresponding to the evaporator A26 and the bathing wastewater in the wastewater drainage pipe 27 will freeze and cannot be used anymore, and may even freeze the equipment. Therefore, the bathing wastewater after the second heat exchange first enters the buried pipe B24, and absorbs the heat in the soil to heat the bathing wastewater in the buried pipe 24 to more than 10 degrees Celsius again, so that the bathing wastewater in the wastewater neutralizing pipe 22 will not freeze after the third heat exchange through the evaporator A26 of the heat pump A, thereby realizing the normal and effective operation of the system.

[0048] In spring, summer and autumn except winter, because the tap water temperature is high, the temperature difference between clean water and waste water is reduced, the heat energy released by waste water during heat exchange becomes smaller, and the temperature drop of waste water becomes smaller, so the temperature of waste water after passing through the heat exchanger and evaporator will increase. The water temperature of clean water in the clean water inlet pipe A1 and the water temperature of waste water in the waste water cold pipe 22 are higher than the water temperature in the buried pipe A3 and the buried pipe B24 respectively, so the solenoid valve A2 and the solenoid valve B23 can be directly opened, so that the clean water in the clean water inlet pipe A1 can be directly heat exchanged through the heat exchanger 4, and the bathing waste water that has undergone the second heat exchange can be directly heat exchanged for the third time through the evaporator A26 of the heat pump A.

[0049] Example 1

[0050] The test record of the ratio of clean water flow to wastewater flow is 1.4:1 is as follows Figure 2 shown.

[0051] Example 2

[0052] The test record of the ratio of clean water flow to wastewater flow is 1.3:1 is as follows Figure 3 shown.

[0053] Example 3

[0054] The test record of the ratio of clean water flow to wastewater flow is 1.2:1 is as follows Figure 4 shown.

[0055] Example 4

[0056] The test record of the ratio of clean water flow to wastewater flow is 1.1:1 is as follows Figure 5 shown.

[0057] Example 5

[0058] The test record of the ratio of clean water flow to wastewater flow is 1.0:1 is as follows Figure 6 shown.

[0059] like Figure 7 As shown, the operation test was carried out according to the present invention, and the results showed that the present invention can operate at a ratio of clean water flow to wastewater flow of 1.4:1. The COP value at this time is 8.132, which is about twice the COP limit of the water (ground) source heat pump unit specified in the national standard, and 50% higher than the first-level energy efficiency of the water (ground) source heat pump unit (ACCP up to 5.0). In winter when the tap water is 8°C, the present invention can use bathing wastewater to prepare 1.4 times the amount of 42°C domestic hot water, which can meet all domestic hot water needs, and the COP value is as high as 8.0 or more.

[0060] Depend on Figure 2 to Figure 6 The tabular data and Figure 7 As shown in the curve graph, in each embodiment of the present invention, when the fresh water inlet temperature is about 8 degrees Celsius in winter, the outlet water temperature can reach above 42 degrees Celsius after being heated by the present invention, which can fully meet the needs of bathing water and domestic water in winter.

[0061] Compared with ordinary ground source heat pump units with the same heating capacity, the method requires only a small length of underground pipes. Taking a residential building with 11 floors, 5 units and 110 households as an example, a 10P machine designed according to the method can meet the domestic hot water supply. The matching underground pipes A3 and B24 are both DN32 double U-shaped PE pipes, with a shaft depth of 120m, a total of 2 shafts, and a very small footprint.

Claims

1. A system for producing domestic hot water by combining a bathing wastewater source with a ground source, characterized in that: The invention comprises a heat exchanger (4), wherein the water inlet end A and the water inlet end B of the heat exchanger (4) are respectively connected to a clean water inlet pipe A (1) and a waste water outlet pipe (16) of a bathing waste water storage tank (14), the water outlet end A and the water outlet end B of the heat exchanger (4) are respectively connected to a clean water primary heating pipe (5) and a waste water primary cooling pipe (17), and the waste water storage tank (14) is connected to the bathing waste water pipe (13); the clean water primary heating pipe (5) is connected to a condensing water inlet end A of a condenser A (7) of a heat pump A, the condensing water outlet end A of the condenser A (7) is connected to a condensing water inlet end B of a condenser B (10) of a heat pump B through a clean water intermediate heating pipe (20), and the condensing water outlet end B of the condenser B (10) is connected to a condensing water outlet end The clean water final heat pipe (41) is connected to the hot water storage tank (11), and a hot water outlet pipe (12) is also connected to the bottom of the hot water storage tank (11). The waste water primary cooling pipe (17) is connected to the evaporation water inlet end A of the evaporator B (21) of the heat pump B. The evaporation water outlet end A of the evaporator B (21) is connected to the evaporation water inlet end B of the evaporator A (26) of the heat pump A through the waste water intermediate cooling pipe (22). The evaporation water outlet end B of the evaporator A (26) is connected to the evaporation water outlet end B of the evaporator A (26). The clean water inlet pipe A (1) or the waste water cooling pipe (22) is connected in parallel with an underground pipe, and the corresponding clean water inlet pipe A (1) or the waste water cooling pipe (22) is also provided with an electromagnetic valve at a position corresponding to the connecting end of the underground pipe; when the waste water cooling pipe (22) is connected in parallel with the underground pipe: a clean water circulation pipe (38) is connected between the hot water storage tank (11) and the clean water heating pipe (20), and the clean water circulation pipe (38) ) is connected to a circulating pump A (39), the circulating pump A (39) pumps water in the hot water storage tank (11) to the clean water heat pipe (20), a valve A (8) is provided on the clean water heat pipe (20) between the condenser A (7) and the clean water heat pipe (20) corresponding to the connection point of the clean water circulation pipe (38), the hot water storage tank (11) is also connected to a clean water inlet pipe B (36), and a valve B (37) is provided on the clean water inlet pipe B (36);The wastewater primary cooling pipe (17) is also connected to a clean water inlet pipe C (32). A circulating pump B (19) is also connected to the wastewater primary cooling pipe (17) between the evaporator B (21) and the clean water inlet pipe C (32). The circulating pump B (19) pumps the bathing wastewater in the wastewater primary cooling pipe (17) to the evaporator B (21). A wastewater circulation pipe (34) is also connected between the wastewater intermediate cooling pipe (22) and the wastewater primary cooling pipe (17). One end of the wastewater circulation pipe (34) is connected to a position of the wastewater intermediate cooling pipe (22) between the connection point of the underground pipe outlet end and the evaporator A (26), and the other end of the wastewater circulation pipe (34) is connected to the wastewater primary cooling pipe (17) at the outlet end B of the heat exchanger (4). A valve C (18) is provided on the wastewater primary cooling pipe (17) between the outlet end B of the heat exchanger (4) and the connection point corresponding to the wastewater circulation pipe (34), a valve D (25) is provided on the wastewater intermediate cooling pipe (22) between the evaporator A (26) and the connection point corresponding to the wastewater circulation pipe (34), a valve E (33) is provided on the clean water inlet pipe C (32), and a valve F (35) is provided on the wastewater circulation pipe (34). ; 2. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: The wastewater outlet pipe (16) is connected to a wastewater supply pump (15), and the wastewater supply pump (15) pumps the bathing wastewater in the wastewater storage tank (14) to the water inlet end B of the heat exchanger (4).

3. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: The ratio of the liquid inlet flow rate of the clean water inlet pipe A (1) entering the heat exchanger (4) to the liquid inlet flow rate of the waste water outlet pipe (16) entering the heat exchanger (4) is in the range of 1.0-1.4:

1.

4. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: The condenser A (7) and the evaporator A (26) of the heat pump A are circulated and connected via a refrigerant pipe A (6). The refrigerant pipe A (6) is also connected to a compressor A (28) and a throttle valve A (29). After the medium A in the refrigerant pipe A (6) flows out from the compressor A (28), it passes through the condenser A (7), the throttle valve A (29) and the evaporator A (26) in sequence, and then flows back to the compressor A (28). The condenser B (10) and the evaporator B (21) of the heat pump B are circulated and connected via a refrigerant pipe B (9). The refrigerant pipe B (9) is also connected to a compressor B (30) and a throttle valve B (31). After the medium B in the refrigerant pipe B (9) flows out from the compressor B (30), it passes through the condenser B (10), the throttle valve B (31) and the evaporator B (21) in sequence, and then flows back to the compressor B (30).

5. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: The bathing waste water pipe (13) is connected to the top of the waste water storage tank (14), and the waste water outlet pipe (16) is connected to the bottom of the side wall of the waste water storage tank (14).

6. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: The clean water end heat pipe (41) is connected to the top of the side wall of the hot water storage tank (11), and the hot water outlet pipe (12) is connected to the bottom of the side wall of the hot water storage tank (11).

7. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: A valve G (40) is also provided on the clean water circulation pipe (38) between the hot water storage tank (11) and the circulation pump A (39).

8. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: The clean water inlet pipe B (36) is connected to the top of the side wall of the hot water storage tank (11), and the clean water circulation pipe (38) is connected to the bottom of the side wall of the hot water storage tank (11).

9. The system for producing domestic hot water by combining a bathing wastewater source with a ground source as claimed in claim 1, characterized in that: When a buried pipe is connected in parallel to the clean water inlet pipe A (1), the buried pipe A (3) is connected in parallel to the clean water inlet pipe A (1), and the two ends of the buried pipe A (3) are respectively connected to the two end positions of the clean water inlet pipe A (1) corresponding to the electromagnetic valve A (2); when a buried pipe is connected in parallel to the waste water cooling pipe (22), the electromagnetic valve B (23) is connected to the waste water cooling pipe (22), and the buried pipe B (24) is connected in parallel to the waste water cooling pipe (22), and the two ends of the buried pipe B (24) are respectively connected to the two end positions of the waste water cooling pipe (22) corresponding to the electromagnetic valve B (23).

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