CN115031280B - Multi-channel large-temperature-difference low-energy-consumption heat supply system and heat supply method thereof - Google Patents
Multi-channel large-temperature-difference low-energy-consumption heat supply system and heat supply method thereof Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims description 27
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1012—Arrangement or mounting of control or safety devices for water heating systems for central heating by regulating the speed of a pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1091—Mixing cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a multi-channel large-temperature-difference low-energy-consumption heat supply system and a heat supply method thereof, wherein the primary side of an economic heat exchanger is connected with the primary side of a first plate heat exchanger in series, and the economic plate heat exchanger preheats backwater of a second user; the primary side of the economic heat exchanger is connected with the evaporator tube to form a net complete circulation loop; the evaporator and the condenser are connected into a loop through a heat pump and a pipeline, work is done through the heat pump, heat energy is absorbed from a net, and heat energy is released to a user side; the second user adopts a water mixing mode, the heat energy exchange is completed in the water mixer through forced circulation of the primary pump, water is discharged from the secondary side of the water mixer and is supplied to each second user through a plurality of branches, and backwaters of each branch of the second user are collected by the water collector and then are connected with total backwaters of the secondary side of the water mixer through the secondary side of the economic plate. The invention adopts the primary side to realize the operation with large temperature difference of one network by adopting the ladder type heat exchange; and the heat transmission power consumption is degraded through the secondary water mixing and branch independent pressurization process.
Description
Technical Field
The invention belongs to the technical field of urban central heating, and relates to a multipath large-temperature-difference low-energy-consumption heating system and a heating method thereof.
Background
The heating in winter in northern towns mainly uses central heating, and is mainly supplied from a thermal power plant far away from a city center due to the influence of environmental protection requirements and national 'double-carbon' target planning, and long-distance pipeline transportation is adopted by utilizing waste heat and waste heat of power generation as heat sources. From the economical point of view of engineering projects, the system must be operated in a high temperature and large temperature difference heating mode. The water supply temperature can reach 130 ℃ and the backwater temperature can be as low as 20 ℃ in the general design. If the design index is to be reached, the existing municipal heat supply pipe network is not changed, and the requirement of municipal newly-added buildings on heat supply is considered, the existing heat exchange process is required to be completely designed and modified.
At present, municipal heat supply is mainly realized by laying a primary pipe network and a secondary pipe network, a plate type indirect heat exchange process is adopted, and the design temperature of primary network backwater is 50 ℃ at the minimum. From the analysis of structural performance characteristics of the plate heat exchanger, if primary net backwater is reduced to 20 ℃, a heat exchanger with a large length-width ratio is required to be adopted, so that the design and shape selection difficulties of the heat exchanger are increased, and investment is increased to update purchase equipment. Meanwhile, the heating process parameters are adjusted, and the problem of insufficient heating capacity caused by low return water temperature is solved by greatly modifying the existing pipe network, especially by a user adopting a series heating mode.
Disclosure of Invention
Aiming at the technical problems, the invention provides a heat supply process, which utilizes the functional characteristics of equipment such as a plate heat exchanger, a heat pump, a water mixer and the like to realize large temperature difference operation of a municipal primary network of a heat supply system and provides a low-energy consumption process operation scheme capable of meeting different pressure and temperature requirements for users in various areas of a secondary network.
To achieve the purpose, the invention adopts the following technical scheme:
multipath big difference in temperature low energy consumption heating system includes:
the primary side water inlet of the first plate heat exchanger is connected with a primary pipe network of a heat source through a temperature control three-way regulating valve, the secondary side user backwater of the first plate heat exchanger exchanges heat in the heat exchanger, and heat energy is provided for the first user through power circulation of a water pump;
the water inlet of the economic heat exchanger is connected with the primary side water outlet of the first plate heat exchanger and is used for absorbing heat energy contained in primary side water outlet of the first plate heat exchanger and preheating secondary side backwater from the water mixer; the economic heat exchanger is connected with the evaporator in series, and the heat energy of the primary pipe network is absorbed again through the heat pump; a communication pipe is arranged between the primary side inlet pipe and the primary side outlet pipe of the economic heat exchanger, and is provided with a first temperature control valve; a communication pipe is arranged at the water inlet and outlet pipe of the water side of the evaporator, and is provided with a second temperature control valve;
the heat pump heating system comprises an evaporator and a condenser, wherein the evaporator and the condenser are connected into a loop through a heat pump and a pipeline; the water supply port of the evaporator tube Cheng Shuice is connected with the primary side water outlet of the economic heat exchanger, the heat medium in the shell side of the evaporator absorbs the latent heat from the primary side water outlet of the economic heat exchanger, the heat medium is converted into high-temperature gas state from liquid state through heat absorption under the action of a heat pump, and the water temperature is reduced and then is sent to the primary pipe network for water return; the gaseous heating medium enters the condenser shell side from the evaporator, and is converted into a liquid state after releasing heat under the cooling effect of low-temperature water from the primary outlet of the water mixer, the low-temperature water of the water mixer is heated to a second user target temperature and is sent to the secondary side outlet of the water mixer, so that primary heating cycle is completed;
the high-temperature water outlet of the condenser is connected to the primary side water inlet of the water mixer, and in the water mixer, the high-temperature water and the low-temperature water from a user are subjected to mixed heat exchange, and the primary side water outlet of the water mixer is returned to the condenser through a pipeline by a primary pump; the secondary side water outlet of the water mixer is connected with a plurality of branches, each branch is supplied to each second user through a branch pump, and each branch backwater of each second user is collected through a water collector and is connected with the total backwater of the secondary side of the water mixer through a pipeline via the secondary side of the economic heat exchanger.
The multi-channel large-temperature-difference low-energy-consumption heat supply method adopts the multi-channel large-temperature-difference low-energy-consumption heat supply system to realize the large-temperature-difference operation of a primary pipe network; the user adopts a grading and multi-branch heat supply process; characterized by comprising the following steps:
the primary process of the system is as follows:
the primary high-temperature water from the municipal primary pipe network flows through the primary side of the first plate heat exchanger at first, and provides heat energy for a first user on the secondary side of the first plate heat exchanger in an indirect heat exchange mode; the opening degree of the temperature three-way regulating valve is regulated according to the outlet temperature of the secondary side of the first plate heat exchanger, so that the outlet temperature of the secondary side is ensured to be consistent with the target temperature; the first heat exchange is carried out, and the high temperature water of the primary pipe network generates first ladder descent;
the effluent from the primary side of the first plate heat exchanger flows into the primary side of the economic heat exchanger, and the backwater from the second user is preheated in an indirect heat exchange mode; the primary pipe network generates a secondary ladder drop through secondary heat exchange and the high temperature water of the primary pipe network; if the water supply temperature of the primary side of the economic heat exchanger is lower than the water return temperature of the secondary side, the first temperature control valve is fully opened, otherwise, the first temperature control valve is in a closed state; the primary effluent after heat exchange of the economic heat exchanger must be reduced below the allowable working temperature of the heat pump;
the primary side outlet water of the economic heat exchanger flows through the tube pass of the evaporator, the evaporator absorbs heat of a primary tube network, and the high temperature water of the primary tube network generates a third gradient descent; if the water inlet temperature of the evaporator exceeds the set allowable working temperature, the second temperature control valve is fully opened, otherwise, the second temperature control valve is in a closed state;
the multi-branch heat supply process for the users comprises the following steps:
the first user backwater flows through the first plate heat exchanger under the drive of the circulating pump, and exchanges heat in the heat exchanger to reach the expected temperature, so as to provide heat energy for users;
the user backwater flowing through the economic heat exchanger performs heat exchange in the heat exchanger, and can supply heat for low-temperature users with small temperature difference under the driving of the circulating pump;
the primary pump drives low-temperature water from the water mixer to flow through a condenser tube pass, the low-temperature water is heated in the tube pass and flows back to the water mixer after being heated, low-temperature backwater of a user in the water mixer exchanges heat with the high-temperature water to reach the expected temperature, and branch pumps are arranged on the secondary side of the water mixer and drive the hot water to the users through the branch pumps; the branch pump guarantees the differential pressure of the branch service according to the resistance of the branch system, and the minimum heat transmission power consumption is realized.
Compared with the prior art, the invention has the following technical effects:
economy: (1) As described above, the temperature control valve design of the first plate change realizes the heat supply of the first user as required, and avoids the waste of heat energy. (2) The first plate heat exchanger, the economic heat exchanger and the heat pump sequentially pass through the cascade absorption primary network heat, so that the primary network large-temperature-difference economic operation is satisfied, and different heating temperatures can be mismatched for users. The primary heat utilization rate is improved by more than 80 percent. (3) According to different operation parameters, the heat exchanger and the heat pump can be flexibly selected by setting different gradient temperatures, so that the efficient operation of the heat pump is realized, and the equipment purchase cost is reduced by more than 20%. (4) Through the design of the water mixing and the branch pump at the user side, the heat energy can be fully utilized, the secondary power consumption can be reduced, and the heat pump can realize one machine for multiple supplies. (5) The heat pump does work and the locking control of the primary water inlet temperature of the water mixer can realize the optimal power transmission ratio of the heat pump on the premise of ensuring the water supply temperature.
Safety: the design of the temperature regulating valve and the temperature control valve can ensure that all equipment runs strictly under the allowable working condition, and avoid equipment damage caused by out-of-control.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Description of the embodiments
The following is a detailed description with reference to the accompanying drawings.
The embodiment adopts a long-distance pipeline and large-temperature-difference operation mode aiming at the heat source of the central heating system in northern towns, which provides new transformation requirements for the original indirect heating process, and the design must be kept unchanged with the layout and operation parameters of the existing municipal heating network, so that the problem of one-network heating parameter adjustment is solved, and the heat requirement of newly-added buildings can be met. The method designs a set of heat supply process, the primary side adopts stepped heat exchange to realize one-net large-temperature-difference operation, and the heat pump graded heat exchange process not only meets the heat utilization requirement of the existing user, but also ensures the economic low-consumption operation and the newly-increased heat utilization requirement of the heat pump. And the heat transmission power consumption is degraded through the secondary water mixing and branch independent pressurization process.
As shown in fig. 1, the multi-path large-temperature-difference low-energy-consumption heating system comprises:
the primary side water inlet of the first plate heat exchanger 1 is connected with a primary pipe network of a heat source through a temperature control three-way regulating valve 5, the secondary side user backwater of the first plate heat exchanger 1 exchanges heat in the heat exchanger, and the heat energy is provided for the first user through the power circulation of a water pump 8;
the water inlet of the economic heat exchanger 2 is connected with the water outlet of the primary side of the first plate heat exchanger 1 and is used for absorbing heat energy contained in the water discharged from the primary side of the first plate heat exchanger 1 and preheating the return water from the secondary side of the water mixer 4; the economic heat exchanger 2 is connected with the evaporator 12 in series, and the heat energy of the primary pipe network is absorbed again through the heat pump; a communication pipe is arranged between the primary side inlet pipe and the primary side outlet pipe of the economic heat exchanger 2, and is provided with a first temperature control valve 6; a communication pipe is arranged at the water inlet and outlet pipe of the water side of the evaporator 12, and is provided with a second temperature control valve 7;
the heat pump heating system comprises an evaporator 12 and a condenser 13, and the evaporator 12 and the condenser 13 are connected into a loop through a heat pump 3 and a pipeline; the water supply port of the tube side water side of the evaporator 12 is connected with the water outlet of the primary side of the economic heat exchanger 2, the heat medium in the shell side of the evaporator 12 absorbs the latent heat from the water outlet of the primary side of the economic heat exchanger 2, and under the action of the heat pump 3, the heat medium is converted from a liquid state into a high-temperature gas state through heat absorption, and the water temperature is reduced and then is sent to the primary pipe network for water return; the gaseous heating medium enters the shell side of the condenser 13 from the evaporator 12, and is converted into a liquid state after releasing heat under the cooling effect of low-temperature water from the primary outlet of the water mixer 4, the low-temperature water of the water mixer 4 is heated to a second user target temperature and is sent to the secondary side outlet of the water mixer 4, so that primary heating cycle is completed;
the high-temperature water outlet of the condenser 13 is connected to the primary side water inlet of the water mixer 4, mixed heat exchange is carried out between high-temperature water and low-temperature water from a user in the water mixer 4, and the primary side water outlet of the water mixer 4 is returned to the condenser 13 through a pipeline by the primary pump 10; the secondary side water outlet of the water mixer 4 is connected with a plurality of branches, each branch is supplied to each second user through a branch pump 9, the branch backwater of each second user is collected through a water collector 11, and is connected with the total backwater of the secondary side of the water mixer 4 through a pipeline via the secondary side of the economic heat exchanger 2.
The multi-channel large-temperature-difference low-energy-consumption heat supply method adopts the multi-channel large-temperature-difference low-energy-consumption heat supply system to realize the large-temperature-difference operation of a primary pipe network; the user adopts a grading and multi-branch heat supply process; characterized by comprising the following steps:
the primary process of the system is as follows:
the primary high-temperature water from the municipal primary pipe network flows through the primary side of the first plate heat exchanger 1 at first, and provides heat energy for a first user on the secondary side of the first plate heat exchanger 1 in an indirect heat exchange mode; the opening degree of the temperature three-way regulating valve 5 is regulated according to the outlet temperature of the secondary side of the first plate heat exchanger 1, so that the outlet temperature of the secondary side is consistent with the target temperature; the first heat exchange is carried out, and the high temperature water of the primary pipe network generates first ladder descent;
the effluent water from the primary side of the first plate heat exchanger 1 flows into the primary side of the economic heat exchanger 2, and the backwater from the second user is preheated in an indirect heat exchange mode; the primary pipe network generates a secondary ladder drop through secondary heat exchange and the high temperature water of the primary pipe network; if the water supply temperature of the primary side of the economic heat exchanger 2 is lower than the water return temperature of the secondary side, the first temperature control valve 6 is fully opened, otherwise, the economic heat exchanger is in a closed state; the primary effluent after heat exchange of the economic heat exchanger 2 must be reduced below the allowable working temperature of the heat pump 3;
the primary side effluent of the economic heat exchanger 2 flows through the tube side of the evaporator 12, the evaporator 12 absorbs heat of a primary tube network, and the high temperature water of the primary tube network generates third gradient descent; if the water inlet temperature of the evaporator 12 exceeds the set allowable working temperature, the second temperature control valve 7 is fully opened, otherwise, the second temperature control valve is in a closed state;
the multi-branch heat supply process for the users comprises the following steps:
the first user backwater flows through the first plate heat exchanger 1 under the drive of the circulating pump 8, and exchanges heat in the heat exchanger to reach the expected temperature, so as to provide heat energy for users;
the user backwater flowing through the economic heat exchanger 2 exchanges heat in the heat exchanger, and can supply heat for low-temperature users with small temperature difference under the driving of the circulating pump;
the primary pump 10 drives low-temperature water from the water mixer 4 to flow through a tube side of the condenser 13, the low-temperature water is heated in the tube side and flows back to the water mixer 4 after being heated, low-temperature backwater of a user in the water mixer 4 exchanges heat with the high-temperature water to an expected temperature, and branch pumps 9 are arranged on secondary sides of the water mixer 4 and drive the hot water to the users through the branch pumps 9; the branch pump guarantees the differential pressure of the branch service according to the resistance of the branch system, and the minimum heat transmission power consumption is realized.
Claims (2)
1. Multipath large temperature difference low energy consumption heating system, its characterized in that includes:
the primary side water inlet of the first plate heat exchanger (1) is connected with a primary pipe network of a heat source through a temperature control three-way regulating valve (5), the secondary side user backwater of the first plate heat exchanger (1) exchanges heat in the heat exchanger, and the heat energy is provided for the first user through the power cycle of a water pump (8);
the water inlet of the economic heat exchanger (2) is connected with the water outlet of the primary side of the first plate heat exchanger (1) and is used for absorbing heat energy contained in the water discharged from the primary side of the first plate heat exchanger (1) and preheating the water returned from the secondary side of the water mixer (4); the economic heat exchanger (2) is connected with the evaporator (12) in series, and the heat energy of the primary pipe network is absorbed again through the heat pump; a communication pipe is arranged between the primary side inlet pipe and the primary side outlet pipe of the economic heat exchanger (2), and is provided with a first temperature control valve (6); a communication pipe is arranged at the water inlet and outlet pipe of the water side of the evaporator (12), and is provided with a second temperature control valve (7);
the heat pump heating system comprises an evaporator (12) and a condenser (13), wherein the evaporator (12) and the condenser (13) are connected into a loop through a heat pump (3) and a pipeline; the water supply port of the tube side water side of the evaporator (12) is connected with the water outlet of the primary side of the economic heat exchanger (2), the heat medium in the shell side of the evaporator (12) absorbs the latent heat of the water discharged from the primary side of the economic heat exchanger (2), under the action of the heat pump (3), the heat medium is converted from a liquid state into a high-temperature gas state through heat absorption, and the water temperature is reduced and then is sent to the primary pipe network for water return; the gaseous heating medium enters the shell side of a condenser (13) from an evaporator (12), the heating medium is converted into a liquid state after releasing heat under the cooling effect of low-temperature water from a primary outlet of a water mixer (4), the low-temperature water of the water mixer (4) is heated to a second user target temperature and is sent to a secondary side outlet of the water mixer (4), and thus primary heating circulation is completed;
the high-temperature water outlet of the condenser (13) is connected to the primary side water inlet of the water mixer (4), mixed heat exchange is carried out between the high-temperature water and the low-temperature water from a user in the water mixer (4), and the primary side water outlet of the water mixer (4) is returned to the condenser (13) through a pipeline by a primary pump (10); the secondary side water outlet of the water mixer (4) is connected with a plurality of branches, each branch is supplied to each second user through a branch pump (9), return water of each branch of each second user is collected through a water collector (11), and is connected with the total return water of the secondary side of the water mixer (4) through a pipeline through the secondary side of the economic heat exchanger (2).
2. The multi-channel large-temperature-difference low-energy-consumption heat supply method is characterized in that the multi-channel large-temperature-difference low-energy-consumption heat supply system disclosed in claim 1 is adopted to realize one-time pipe network large-temperature-difference operation; the user adopts a grading and multi-branch heat supply process; characterized by comprising the following steps:
the primary process of the system is as follows:
the primary high-temperature water from the municipal primary pipe network flows through the primary side of the first plate heat exchanger (1) at first, and provides heat energy for a first user on the secondary side of the first plate heat exchanger (1) in an indirect heat exchange mode; the opening degree of the temperature three-way regulating valve (5) is regulated according to the outlet temperature of the secondary side of the first plate heat exchanger (1), so that the outlet temperature of the secondary side is consistent with the target temperature; the first heat exchange is carried out, and the high temperature water of the primary pipe network generates first ladder descent;
effluent water from the primary side of the first plate heat exchanger (1) flows into the primary side of the economic heat exchanger (2), and backwater from a second user is preheated in an indirect heat exchange mode; the primary pipe network generates a secondary ladder drop through secondary heat exchange and the high temperature water of the primary pipe network; if the water supply temperature of the primary side of the economic heat exchanger (2) is lower than the water return temperature of the secondary side, the first temperature control valve (6) is fully opened, otherwise, the first temperature control valve is in a closed state; the primary effluent after heat exchange of the economic heat exchanger (2) must be reduced below the allowable working temperature of the heat pump (3);
the primary side outlet water of the economic heat exchanger (2) flows through the tube side of the evaporator (12), the evaporator (12) absorbs heat of a primary tube network, and the primary tube network generates third gradient descent in high temperature water; if the water inlet temperature of the evaporator (12) exceeds the set allowable working temperature, the second temperature control valve (7) is fully opened, otherwise, the second temperature control valve is in a closed state;
the multi-branch heat supply process for the users comprises the following steps:
the first user backwater flows through the first plate heat exchanger (1) under the drive of the circulating pump (8), and exchanges heat in the heat exchanger to reach the expected temperature, so as to provide heat energy for users;
the user backwater flowing through the economic heat exchanger (2) exchanges heat in the heat exchanger, and can supply heat for low-temperature users with small temperature difference under the driving of the circulating pump;
the primary pump (10) drives low-temperature water from the water mixer (4) to flow through a tube side of the condenser (13), the low-temperature water is heated in the tube side and then flows back to the water mixer (4), low-temperature backwater of a user in the water mixer (4) exchanges heat with the high-temperature water to an expected temperature, the secondary side of the water mixer (4) is provided with branch pumps (9), and the branch pumps (9) drive the hot water to the users; the branch pump guarantees the differential pressure of the branch service according to the resistance of the branch system, and the minimum heat transmission power consumption is realized.
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