Secondary water supply and domestic hot water combined energy-saving system based on heat cycle collaboration

Abstract

The invention provides a secondary water supply and domestic hot water combined energy-saving system based on heat cycle synergy, which recovers heat generated by a secondary water supply pump room, and uses the recovered heat for heating or preserving heat of water in an adjacent domestic hot water pump room, so that the energy utilization rate is increased, and the energy consumption is reduced. And safe and stable operation of equipment in the secondary water supply pump room is ensured. The secondary water supply pump room comprises a plurality of groups of water pumps and a plurality of groups of frequency converters; the domestic hot water pump room comprises a hot water tank; a heat exchanger; an inner cavity of each group of heat conducting plates is filled with a heat exchange working medium, and each group of heat conducting plates further comprises a heat exchange working medium outlet and a heat exchange working medium inlet.

Description

Technical Field

[0001] The present invention relates to the technical field of water equipment utilization, and specifically to a secondary water supply and domestic hot water combined energy-saving system based on thermal cycle collaboration. Background Art

[0002] In the process of supplying water to high floors, secondary water supply equipment is generally required for water supply operations, that is, a secondary water supply pump room is required. The existing secondary water supply equipment includes several groups of water pumps and several groups of frequency converters. During actual use, heat energy is generated. If the heat in the secondary water supply pump room cannot be discharged in time, the temperature of the secondary water supply pump room will rise, and then the secondary water supply equipment will operate in a high temperature environment, resulting in a shortened service life of the equipment. Therefore, it is urgent to find a reliable cooling method.

[0003] On the other hand, when there are centralized water supply areas such as hotels, motels, and hospitals in high-rise buildings, domestic hot water pump rooms are often required. Existing domestic hot water pump rooms generate hot water through electric heating, solar heating, or natural gas heating, and then store the hot water in a hot water tank. The hot water is then distributed to each room or area requiring hot water through external pipes. The heat source of the hot water in the hot water tank is direct energy. In actual use, a large amount of energy is required to ensure that the water temperature in the hot water tank reaches the set temperature for continuous use.

[0004] In view of the above two reasons, whether the heat generated in the secondary water supply pump room can be directly used to directly heat the water in the domestic hot water pump room is a technical problem that needs to be solved. Summary of the Invention

[0005] In response to the above problems, the present invention provides a combined energy-saving system for secondary water supply and domestic hot water based on thermal cycle synergy, which recovers the heat generated by the secondary water supply pump room and uses the recovered heat to heat or insulate the water in the adjacent domestic hot water pump room, thereby improving energy utilization and ensuring the safe and stable operation of equipment in the secondary water supply pump room.

[0006] A secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy, characterized in that it includes:

[0007] Secondary water supply pump room, which includes several groups of water pumps and several groups of frequency converters;

[0008] Domestic hot water pump room, which includes a hot water tank;

[0009] heat exchangers;

[0010] and a plurality of groups of heat conducting plates, wherein the inner cavity of each group of heat conducting plates is filled with a heat exchanging medium, and each group of heat conducting plates further comprises a heat exchanging medium outlet and a heat exchanging medium inlet;

[0011] A corresponding heat conducting plate is mounted on the motor heating housing of each water pump and the back heating housing of the inverter. All the heat conducting plates are connected in parallel to the input end of the confluence main pipe. The input end of the confluence main pipe is connected to the tube side inlet of the heat exchanger. The tube side outlet of the heat exchanger is externally connected to the outflow main pipe. The outflow main pipe is connected in parallel to the heat exchange medium inlet of each heat conducting plate through a pipeline. The hot water tank is provided with a bypass outlet and a bypass inlet. The bypass outlet of the hot water tank is connected to the shell side inlet of the heat exchanger through a pipeline, and the shell side outlet of the heat exchanger is connected to the bypass inlet through a pipeline.

[0012] It is further characterized by:

[0013] The hot water tank is equipped with multiple sets of heating pipes. The hot water in the hot water tank is heated electrically. The hot water tank is provided with an upper water inlet and a lower water outlet. The bypass outlet and the bypass inlet are located in the middle of the height direction of the hot water tank, close to the secondary water supply pump room, which ensures that the entire pipeline is relatively short and saves energy.

[0014] When the heat exchange medium is a phase-change medium, that is, the heat exchange medium is in liquid state before absorbing heat and becomes gaseous after absorbing a certain amount of heat, the pipeline corresponding to the heat exchange medium outlet is a heat pipe, and the converging pipe is a heat pipe, which ensures that the gaseous heat exchange medium is liquefied by low-temperature water in the heat exchanger, and then the liquefied heat exchange medium flows again into the corresponding heat conduction plate through the outflow main pipe;

[0015] When the heat exchange medium is a liquid medium, a one-way liquid valve and a liquid pump are integrated on the confluence pipe. The one-way liquid valve and the liquid pump draw the heat exchange medium in all the heat transfer plates into the confluence pipe, and then pump the heat exchange medium into the heat exchanger and low-temperature water for heat exchange, and then flow along the outflow main pipe to enter the corresponding heat transfer plate again;

[0016] The shape of the heat conducting plate is designed and manufactured according to the shape of the heating shell of each corresponding water pump and inverter, which ensures that the heat conducting surface of the heat conducting plate and the corresponding heating shell are reliably fitted, ensuring sufficient and reliable heat recovery;

[0017] Alternatively, the motor heating housings of all water pumps are arranged flush toward one end, and a heat conducting plate corresponding to the water pumps completely covers the motor heating housings of all water pumps and is set closely together. The back heating housings of all inverters are arranged flush toward one end, and a heat conducting plate corresponding to the inverter completely covers the back heating housings of all inverters and is set closely together. In this case, only two sets of heat conducting plates are required.

[0018] The heat exchange medium in the inner cavity of the heat conducting plate is an antifreeze and anti-corrosion medium, which ensures that the entire system can operate continuously, stably and reliably;

[0019] The water in the hot water tank and the heat exchanger completes heat exchange through the flow of water in the hot water tank, without the need for an additional pump body;

[0020] The heat conducting surface of the heat conducting plate and the heating shell are tightly fitted by mechanical pressing or welding, and the air gap formed after the heat conducting plate and the heating shell are positioned is filled with thermal grease, so that the heat energy generated by the heating shell is fully absorbed by the heat conducting plate and performs subsequent thermal circulation operations through the heat exchange medium.

[0021] After adopting the above technical solution, the motor housing of the water pump and the backplane housing of the inverter are embedded with a heat conduction plate, where the heat conduction plate is a mature heat-conducting device made of copper or aluminum alloy. The heat conduction plate absorbs the heat energy generated by the water pump and inverter through a heat exchange medium. The heat exchange medium then transfers the heat energy to the water in the hot water tank through a heat exchanger. It is used to preheat the cold water and can heat the cold water from 15℃ to 35℃, which can reduce the energy consumption of the main heater. This system also conducts away the heat energy generated by the water pump and inverter, lowering the pump room temperature and cooling the control cabinet, thereby protecting the equipment and electrical components. When the water pump is idling, the heat conduction plate can quickly cool the water pump motor, thereby ensuring the long-term stable and reliable use of the water pump. It recovers the heat generated in the secondary water supply pump room and uses the recovered heat to heat or keep the water in the adjacent domestic hot water pump room, improving energy utilization and ensuring the safe and stable operation of the equipment in the secondary water supply pump room. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of the system of the present invention;

[0023] The names corresponding to the serial numbers in the figure are as follows:

[0024] Secondary water supply pump room 10, water pump 11, inverter 12, domestic hot water pump room 20, hot water tank 21, heating pipe 22, upper water inlet 23, lower water outlet 24, heat exchanger 30, heat conduction plate 40, and converging main pipe 50. DETAILED DESCRIPTION

[0025] A combined energy-saving system for secondary water supply and domestic hot water based on thermal cycle synergy, see Figure 1 , which includes:

[0026] The secondary water supply pump room 10 includes several groups of water pumps 11 and several groups of frequency converters 12;

[0027] Domestic hot water pump room 20, which includes a hot water tank 21;

[0028] heat exchanger 30;

[0029] and a plurality of groups of heat conducting plates 40, wherein the inner cavity of each group of heat conducting plates 40 is filled with a heat exchanging medium, and each group of heat conducting plates further comprises a heat exchanging medium outlet and a heat exchanging medium inlet;

[0030] Corresponding heat conducting plates 40 are mounted on the motor heating housing of each water pump 11 and the back heating housing of the inverter 12. All the heat conducting plates 40 are connected in parallel to the input end of the converging main pipe 50. The input end of the converging main pipe 50 is connected to the tube side inlet of the heat exchanger 30. The tube side outlet of the heat exchanger 30 is externally connected to the outflow main pipe (blocked in the figure). The outflow main pipe is connected in parallel to the heat exchange medium inlet of each heat conducting plate 40 through a pipeline. The hot water tank 21 is provided with a bypass outlet and a bypass inlet. The bypass outlet of the hot water tank 21 is connected to the shell side inlet of the heat exchanger 30 through a pipeline, and the shell side outlet of the heat exchanger 30 is connected to the bypass inlet through a pipeline.

[0031] During specific implementation, the hot water tank 21 has multiple groups of heating pipes 22 built in. The hot water in the hot water tank 21 is heated electrically. The hot water tank 21 is provided with an upper water inlet 23 and a lower water outlet 24. The bypass outlet and bypass inlet are located in the middle of the height direction of the hot water tank 21, close to the secondary water supply pump room 10, which ensures that the entire pipeline is set relatively short to save energy.

[0032] During specific implementation, the secondary water supply pump room 10 and the domestic hot water pump room 20 are arranged adjacent to each other, which reduces the cost of pipe connection.

[0033] When the heat exchange medium is a phase-change medium, that is, the heat exchange medium is in liquid state before absorbing heat and becomes gaseous after absorbing a certain amount of heat, the pipeline corresponding to the heat exchange medium outlet is a heat pipe, and the converging pipe 50 is a heat pipe, which ensures that the gaseous heat exchange medium is liquefied by low-temperature water in the heat exchanger 30. The liquefied heat exchange medium then flows back into the corresponding heat conducting plate 40 through the outflow manifold.

[0034] When the heat exchange medium is a liquid medium, a one-way liquid valve and a liquid pump are integrated on the confluence pipe 50. The one-way liquid valve and the liquid pump draw the heat exchange medium in all the heat transfer plates 40 into the confluence pipe, and then pump the heat exchange medium into the heat exchanger 30 and the low-temperature water for heat exchange, and then enter the corresponding heat transfer plate 40 again along the outflow main pipe.

[0035] In specific implementation, when the installation positions of the motor heating shell of the water pump 11 and the back plate heating shell of the inverter 12 are far apart from each other and their positions are in different directions, the shape of the heat conduction plate is designed and manufactured according to the shape of the heating shell of each corresponding water pump and inverter, which ensures that the heat conduction surface of the heat conduction plate and the corresponding heating shell are reliably fitted, ensuring that the heat energy recovery is sufficient and reliable.

[0036] When the installation displacements of the motor heating housing of the water pump 11 and the back heating housing of the inverter 12 are in the same direction and the distance is close, the motor heating housings of all the water pumps 11 are arranged flush toward one end, and a heat conducting plate 40 corresponding to the water pump 11 completely covers the motor heating housings of all the water pumps and is tightly set. The back heating housings of all the inverters 12 are arranged flush toward one end, and a heat conducting plate 40 corresponding to the inverter 12 completely covers the back heating housings of all the inverters and is tightly set. At this time, only two groups of heat conducting plates 40 are required.

[0037] During specific implementation, the heat exchange medium in the inner cavity of the heat conducting plate 40 is an antifreeze and anti-corrosion medium, which ensures that the entire system can operate continuously, stably and reliably.

[0038] During specific implementation, the water in the hot water tank 21 and the heat exchanger 30 completes heat exchange through the flow of water in the hot water tank, without the need to provide an additional pump body.

[0039] During specific implementation, the heat-conducting surface of the heat-conducting plate 40 and the heating shell are tightly fitted by mechanical pressing or welding, and the air gap formed after the heat-conducting plate 40 and the heating shell are positioned is filled with thermal grease, so that the heat energy generated by the heating shell is fully absorbed by the heat-conducting plate and subsequent heat circulation operations are carried out through the heat exchange medium.

[0040] After adopting the above technical solution, the motor housing of the water pump and the backplane housing of the inverter are embedded with a heat conducting plate, where the heat conducting plate is a mature heat conducting device made of copper or aluminum alloy. The heat conducting plate absorbs the heat energy generated by the water pump and the inverter through the heat exchange working medium. The heat exchange working medium then transfers the heat energy to the water in the hot water tank through the heat exchanger. It is used to preheat the cold water and can heat the cold water from 15℃ to 35℃, which can reduce the energy consumption of the main heater.

[0041] The beneficial effects are as follows: at the secondary water supply pump room end: ① the temperature of the two major heat sources can be removed, reducing the temperature of the pump room; ② the control cabinet can be cooled to protect the electrical components; ③ if the water pump is idling, the temperature rises sharply and is prone to damage, and cooling can play a protective role;

[0042] Domestic hot water pump room: ① It can heat the hot water tank in the domestic hot water pump room, saving electricity; ② It uses a plate heat exchanger to recover waste heat from the water pump and inverter to preheat the cold water inlet. Every 1°C increase in water temperature can save 2% of heating energy (Carnot cycle theoretical value).

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0044] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy, characterized in that: It includes: Secondary water supply pump room, which includes several groups of water pumps and several groups of frequency converters; Domestic hot water pump room, which includes a hot water tank; heat exchangers; and a plurality of groups of heat conducting plates, wherein the inner cavity of each group of heat conducting plates is filled with a heat exchanging medium, and each group of heat conducting plates further comprises a heat exchanging medium outlet and a heat exchanging medium inlet; A corresponding heat conducting plate is mounted on the motor heating housing of each water pump and the back heating housing of the inverter. All the heat conducting plates are connected in parallel to the input end of the confluence main pipe. The input end of the confluence main pipe is connected to the tube side inlet of the heat exchanger. The tube side outlet of the heat exchanger is externally connected to the outflow main pipe. The outflow main pipe is connected in parallel to the heat exchange medium inlet of each heat conducting plate through a pipeline. The hot water tank is provided with a bypass outlet and a bypass inlet. The bypass outlet of the hot water tank is connected to the shell side inlet of the heat exchanger through a pipeline, and the shell side outlet of the heat exchanger is connected to the bypass inlet through a pipeline.

2. The secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 1 is characterized by: The hot water tank has multiple sets of heating pipes built in, and the hot water in the hot water tank is heated electrically. The hot water tank is provided with an upper water inlet and a lower water outlet, and the bypass outlet and bypass inlet are located in the middle of the height direction of the hot water tank close to the secondary water supply pump room.

3. The secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 1 is characterized by: When the heat exchange medium is a phase change medium, that is, the heat exchange medium is in liquid state before absorbing heat and becomes gaseous after absorbing a certain amount of heat, the pipeline corresponding to the heat exchange medium outlet is a heat pipe, and the converging pipeline is a heat pipe, which ensures that the gaseous heat exchange medium is liquefied by low-temperature water in the heat exchanger, and then the liquefied heat exchange medium flows into the corresponding heat conduction plate again through the outflow main pipe.

4. The secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 1 is characterized in that: When the heat exchange medium is a liquid medium, a one-way liquid valve and a liquid pump are integrated on the confluence pipe. The one-way liquid valve and the liquid pump draw the heat exchange medium in all the heat transfer plates into the confluence pipe, and then pump the heat exchange medium into the heat exchanger and low-temperature water for heat exchange, and then enter the corresponding heat transfer plate again along the outflow main pipe.

5. The secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 1 is characterized in that: The shape of the heat conducting plate is designed and manufactured according to the shape of the heating housing of each corresponding water pump and inverter.

6. The secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 1 is characterized by: The motor heating shells of all water pumps are arranged flush toward one end, and a heat conducting plate corresponding to the water pump completely covers the motor heating shells of all water pumps and is set tightly. The back heating shells of all inverters are arranged flush toward one end, and a heat conducting plate corresponding to the inverter completely covers the back heating shells of all inverters and is set tightly.

7. The secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 1 is characterized by: The heat exchange medium in the inner cavity of the heat conducting plate is an antifreeze and anti-corrosion medium.

8. The secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 1 is characterized by: The water in the hot water tank and the heat exchanger completes heat exchange through the flow of water in the hot water tank, and no additional pump body is required.

9. A secondary water supply and domestic hot water combined energy-saving system based on thermal cycle synergy according to claim 5 or 6, characterized in that: The heat-conducting surface of the heat-conducting plate and the heating shell are tightly fitted by mechanical pressing or welding, and the air gap formed after the heat-conducting plate and the heating shell are positioned is filled with thermal grease.

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