CN113375212A - High-efficient heat pump system that retrieves of central heating pipe network return water - Google Patents
High-efficient heat pump system that retrieves of central heating pipe network return water Download PDFInfo
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- CN113375212A CN113375212A CN202110534054.6A CN202110534054A CN113375212A CN 113375212 A CN113375212 A CN 113375212A CN 202110534054 A CN202110534054 A CN 202110534054A CN 113375212 A CN113375212 A CN 113375212A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 189
- 238000010438 heat treatment Methods 0.000 title claims abstract description 16
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 239000008400 supply water Substances 0.000 claims description 5
- 239000002440 industrial waste Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- F24D19/1015—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
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
Abstract
The invention discloses a high-efficiency backwater recovery heat pump system for a centralized heat supply pipe network. The system layout of the traditional heating plant is optimized and modified. The heat exchanger at the heat source side of the primary pipe network is respectively connected with the primary pipe network water supply pipe and the primary pipe network water return pipe, the water return temperature of the primary pipe network is reduced by adopting a direct supply or heat exchange mode with the secondary pipe network for the primary pipe network water return, and the temperature difference of the supplied water and the returned water is further enlarged, so that the heat transfer capacity of the pipe network is improved, and the heat efficiency of the heat supply pipe network is improved. The invention uses the primary network backwater as a low-temperature side (user) heat source, and utilizes the waste heat of the primary network backwater in a direct supply mode, thereby not only realizing the effective recycling of the primary network backwater heat and providing hot water for hot users, but also reducing the temperature of the primary network backwater, increasing the temperature difference of the primary network backwater and effectively solving the problem of heat supply saturation of a heat supply network.
Description
Technical Field
The invention belongs to the field of centralized heat supply, and particularly relates to a high-efficiency backwater recovery heat pump system for a centralized heat supply pipe network.
Background
Along with the gradual increase of the urban scale, the heat supply demand of users is also getting bigger and bigger, the heat supply capacity of the current centralized heat supply pipe network gradually tends to be saturated, and how to further develop the heat supply potential is an important target for the reformation and development of the urban centralized heat supply pipe network. The action mode of the heat pump hot water is that heat generated by the heat pump is transferred into the water tank through water pump circulation to heat cold water in the water tank, and the heat pump stops working after the cold water reaches a set temperature. After the water level or the temperature of the water tank is reduced to the set water level or the set temperature, the system replenishes water for heating. When the heat supply end does not use water for a long time, the water temperature in the pipeline is lower, firstly, the cold water in the pipeline comes out, only the cold water in the pipeline can be used by a user after being completely discharged, therefore, a part of water resources can be wasted, meanwhile, the waiting time of the user is also increased, the design of the water return system is to ensure the water supply temperature of each water using point, the effect of opening the tap to output hot water is achieved, when the temperature of the water which is the most unfavorable point in the water supply pipeline is lower than the set temperature, the water return system can push the cold water in the pipeline back to the water tank to supplement water again for heating, and the effect of opening the tap to heat is achieved.
The heat supply system of the thermal power plant is one of the main heat sources of the heat supply system in China, and generally adopts an indirect heat supply mode, wherein a plate heat exchanger is adopted in the indirect heat supply mode, so that the heat transfer coefficient is high, and the adaptability is good; meanwhile, the heat supply pipe network is divided into a primary network and a secondary network by an indirect heat supply mode, the primary network and the secondary network use the heat exchange station as a medium for heat exchange and are respectively circulated separately, the normal operation of the primary network cannot be influenced under the condition that the secondary network loses a large amount of water, and the operation independence is good. Because the heating system divides the heating pipe network into a primary network and a secondary network, high-temperature water produced by the power plant firstly flows through the heat exchanger in the primary network to exchange heat to the primary network circulation and then returns to the power plant to be reheated to participate in the circulation, the primary network exchanges heat with the secondary network through the heat exchange station, and the secondary network transfers the heat to the heat user. The temperature of the return water is an important factor for determining the heat benefit of the thermal power plant, the temperature of the return water is high, the heat benefit of the thermal power plant is low, if the primary network return water can be extracted to serve as the water supply of a heat user, the residual heat in the return water is utilized, the heat demand of the heat user is met, the temperature of the return water is reduced, the heat supply capacity of the thermal power plant is effectively improved, and the two purposes are achieved.
Disclosure of Invention
The invention aims to provide a high-efficiency backwater recovery heat pump system of a centralized heat supply pipe network aiming at the defects of the prior art. The invention optimally designs the circulation mode and the pipeline of the return water part of the primary pipe network, recycles the waste heat in the return water of the primary pipe network through secondary heat exchange, not only meets the heat utilization requirement of heat users, but also reduces the return water temperature of the primary pipe network, effectively improves the heat supply capacity of the thermal power plant, and is suitable for domestic hot water with lower temperature requirement.
The purpose of the invention is realized by the following technology: a high-efficiency backwater recovery heat pump system for a centralized heat supply pipe network is divided into a primary pipe network backwater area and a backwater waste heat utilization area.
The primary pipe network water return area comprises: the heat exchange station comprises a primary pipe network heat source side heat exchanger, a heat exchange station primary net water inlet valve, a heat exchange station primary net water outlet valve and a primary net circulating pump which are sequentially connected in series to form a loop; a primary network water supply pump is connected to pipelines of the primary network water outlet valve and the primary network circulating pump of the heat exchange station;
the return water waste heat utilization area comprises: a primary network backwater booster pump front valve, a primary network backwater booster pump rear valve, a secondary pipe network heat consumer and a heat consumer backwater cut-off valve which are connected in series in sequence; the pump front valve of the primary net return water booster pump is connected to the heat exchange station and a pipeline of a primary net water outlet valve of the heat exchange station; a primary net direct supply regulating valve is connected to pipelines of a front valve of the primary net return water booster pump and the primary net return water booster pump, and the primary net direct supply regulating valve is connected with a pipeline between a primary net water inlet valve and the heat exchange station; the hot user backwater cut-off valve is connected to a primary network water outlet valve of the heat exchange station and a pipeline of a primary network circulating pump; the backwater waste heat utilization area also comprises a communication control module; and the primary network direct supply regulating valve and the front pump valve of the primary network return water booster pump are connected with the communication control module.
Further, the heat exchanger on the heat source side of the primary pipe network is used for heating the circulating water of the primary pipe network by using the circulating water of the power plant or the industrial waste heat.
Furthermore, the primary pipe network water supply pump is connected with the communication control module and used for supplying circulating water for the primary pipe network.
Furthermore, the high-efficiency backwater recovery heat pump system for the centralized heat supply pipe network further comprises a plurality of temperature sensors and an electric actuator for controlling the opening and closing of each valve. Each temperature sensor is connected with a communication control module, and the communication control module is connected with an electric actuator. The temperature sensor is used for monitoring the return water temperature of the circulating water of the primary pipe network after passing through the heat exchange station, the circulating water temperature of a secondary pipe network heat user, the water supply temperature of the primary pipe network water supply pump, the return water temperature of the primary pipe network and the like, and sending temperature data to the communication control module.
Furthermore, the communication control module can receive and read the temperature and flow data of each temperature sensor and each water pump, can judge the change with the heat demand according to sensor data to thereby can control the valve aperture of primary network direct supply governing valve and primary network return water booster pump front valve through changing with the heat demand and control electric actuator, with this heat supply of adjusting primary pipe network circulating water to the secondary pipe network.
Further, when the outlet valve of the primary pipe network of the heat exchange station is closed, the circulating water of the primary pipe network sequentially passes through the primary pipe network inlet valve of the heat exchange station, the front valve of the primary pipe network return water booster pump, the rear valve of the primary pipe network return water booster pump, the heat user of the secondary pipe network and the heat user return water cut-off valve to exchange heat, and returns to the heat source side heat exchanger of the primary pipe network after mixed with the supply water of the primary pipe network supply water pump to complete circulation.
The invention has the beneficial effects that:
(1) the invention directly supplies part of the primary backwater waste heat to the secondary pipe network heat users by using the backwater waste heat recovery area, thereby well meeting the heat demand of some users with lower temperature requirements.
(2) The invention adopts the scheme of adding primary heat exchange to effectively reduce the temperature of primary network backwater, increase the heat exchange temperature difference in the heat source side heat exchanger, effectively improve the heat transport capacity of a pipe network and reduce the irreversible heat loss in the heat transfer link.
(3) The transformation scheme of the invention is easy to realize, and only parallel pipelines are added in the existing primary pipe network, namely a backwater waste heat utilization area is added. The reconstruction cost is low, and the engineering application potential is good.
Drawings
Fig. 1 is a circulation flow chart of a high-efficiency recovery heat pump system for backwater of a centralized heat supply pipe network provided by the invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1, the system for efficiently recovering the return water of the centralized heat supply pipe network provided by the invention is divided into a primary pipe network return water area and a return water waste heat utilization area. The primary pipe network water return area comprises: the heat exchanger at the heat source side of the primary pipe network, the water inlet valve 2 of the primary pipe network of the heat exchange station, the heat exchange station 3, the water outlet valve 4 of the primary pipe network of the heat exchange station and the primary pipe network circulating pump 5 are sequentially connected in series to form a loop; in the invention, three groups of a heat exchange station primary network water inlet valve 2, a heat exchange station 3 and a heat exchange station primary network water outlet valve 4 are connected in parallel in a primary network pipeline; a primary net make-up water pump 6 is connected to the pipelines of the primary net water outlet valve 4 and the primary net circulating pump 5 of the heat exchange station;
the return water waste heat utilization area comprises: a primary network backwater booster pump front valve 8, a primary network backwater booster pump 9, a primary network backwater booster pump rear valve 10, a secondary network heat consumer 11 and a heat consumer backwater cut-off valve 12 which are connected in series in sequence; in the invention, two groups of secondary pipe network heat users 11 are connected in parallel in a pipeline of the secondary pipe network, and the secondary pipe network can simultaneously supply heat to the two groups of users; a pump front valve 8 of the primary network return booster pump is connected to pipelines of the heat exchange station 3 and the primary network water outlet valve 4 of the heat exchange station; a primary net direct supply regulating valve 7 is connected to pipelines of a front valve 8 of the primary net return water booster pump and a primary net return water booster pump 9, and the primary net direct supply regulating valve 7 is connected with a pipeline between the primary net water inlet valve 2 and the heat exchange station 3; the hot user backwater cut-off valve 12 is connected to the pipelines of the primary network water outlet valve 4 and the primary network circulating pump 5 of the heat exchange station; the backwater waste heat utilization area also comprises a communication control module; and the primary network direct supply regulating valve 7 and the primary network return water booster pump front valve 8 are connected with the communication control module.
The heat exchanger 1 on the heat source side of the primary pipe network is used for heating the circulating water of the primary pipe network by using the circulating water of the power plant or the industrial waste heat.
And the primary pipe network replenishing water pump 6 is connected with the communication control module and is used for replenishing circulating water of the primary pipe network.
The high-efficiency backwater recovery heat pump system for the centralized heat supply pipe network further comprises a plurality of temperature sensors and electric actuators for controlling the opening and closing of the valves. Each temperature sensor is connected with a communication control module, and the communication control module is connected with an electric actuator. The temperature sensor is used for monitoring the return water temperature of the circulating water of the primary pipe network after passing through the heat exchange station 3, the circulating water temperature of the secondary pipe network heat user 11, the water supply temperature of the primary pipe network water supply pump 6, the return water temperature of the primary pipe network and the like, and sending temperature data to the communication control module.
The communication control module can receive and read the temperature and flow data of each temperature sensor and each water pump, can judge the change with the heat demand according to sensor data to thereby can control the valve aperture of primary network direct supply governing valve 7 and primary network return water booster pump front valve 8 through changing with the heat demand and control electric actuator, with this heat supply of adjusting primary network circulating water to the secondary pipe network.
When the primary pipe network water outlet valve 4 of the heat exchange station is closed, the primary pipe network circulating water sequentially passes through the primary pipe network water inlet valve 2 of the heat exchange station, the front valve 8 of the primary pipe network water return booster pump, the primary pipe network water return booster pump 9, the rear valve 10 of the primary pipe network water return booster pump, the secondary pipe network heat consumer 11 and the heat consumer water return cut-off valve 12 to exchange heat, and then returns to the primary pipe network heat source side heat exchanger 1 after being mixed with the supplementing water of the primary pipe network supplementing water pump 6 to complete circulation.
The condition of a primary pipe network water return area is the same as that of a common primary pipe network, superheated steam or industrial waste heat generated by circulation of a power plant exchanges heat through the primary pipe network heat source side heat exchanger 1, and liquid water obtained by condensation is returned to the power plant again. The primary pipe network circulating water is lifted to the water supply temperature through the primary pipe network heat source side heat exchanger 1, then flows into the heat exchange station 3 through the primary pipe network water inlet valve 2 of the heat exchange station, the primary pipe network water supply transfers heat to a part of heat users, and the return water flows out of the heat exchange station 3 through the primary pipe network water outlet valve 4 of the heat exchange station. And the return water of the primary pipe network and the make-up water of the primary pipe network make-up water pump 6 are mixed and then return to the heat exchanger 1 at the heat source side of the primary pipe network for primary pipe network circulation again. When the primary network direct supply regulating valve 7 or the front valve 8 of the primary network return water booster pump is opened, the primary network circulating water flows into the return water waste heat recovery area, and supplies heat to secondary network heat users under the regulation and control of the communication control module.
The communication control module controls the opening of each valve according to the data of the temperature sensor and the flow sensor, so that the heat supply from the primary pipe network to the secondary pipe network is regulated and controlled.
Example 1: when heat supply to the secondary pipe network side is not needed, the primary pipe network circulation loop normally works, circulating water obtains higher temperature after passing through the primary pipe network heat source side heat exchanger 1, heat exchange is carried out from the primary pipe network water inlet valve 2 to the heat exchange station 3 in the heat exchange station, heat is transferred to a return water waste heat utilization area, then the heat is mixed with primary pipe network water supply through the primary pipe network water outlet valve 4 in the heat exchange station, and the heat returns to the primary pipe network heat source side heat exchanger 1 through the primary pipe network circulating pump 5 to be heated, so that primary circulation is completed.
Example 2: when the demand of the heat user of the secondary pipe network is not high, the secondary heat supply is carried out by utilizing the return water waste heat of the primary pipe network. The temperature of the primary network circulating water is reduced after heat exchange is carried out through the primary network water inlet valve 2 and the heat exchange station 3 of the heat exchange station, the front valve 8 of the primary network return water booster pump is opened by the communication control module at the moment, the return water with lower temperature reaches a secondary network heat user 11 through a pipeline under the action of the primary network return water booster pump 9, heat is supplied to the user, and then the return water returns to the primary network circulation through the heat user return water cut-off valve 12 and is mixed with primary network water supplement, and the return water returns to the primary network heat source side heat exchanger 1 through the primary network circulation pump 5 to be heated, so that primary circulation is completed.
Example 3: when the demand of the heat user of the secondary pipe network is high, part of the circulating water of the primary pipe network is directly utilized to supply heat to the heat user 11 of the secondary pipe network. At the moment, the communication control module opens a primary network direct supply regulating valve 7, a front valve 8 of a primary network return water booster pump is closed, primary network circulating water obtains higher temperature through a primary network heat source side heat exchanger 1, one part of the primary network circulating water enters a heat exchange station 3 through a primary network water inlet valve 2 of the heat exchange station to carry out conventional heat exchange, the other part of the primary network circulating water reaches a secondary network heat user 11 through the primary network direct supply regulating valve 7, a primary network return water booster pump 9 and a rear valve 10 of the primary network return water booster pump, heat is directly supplied to the user, then the heat returns to the primary network circulation through a heat user return water stop valve 12 and is mixed with primary network supplementing water, and the heat returns to the primary network heat source side heat exchanger 1 through a primary network circulating pump.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (6)
1. The utility model provides a high-efficient heat recovery pump system of central heating pipe network return water which characterized in that, this system divide into once pipe network return water district and return water waste heat utilization district.
The primary pipe network water return area comprises: the heat exchange system comprises a primary pipe network heat source side heat exchanger (1), a heat exchange station primary pipe network water inlet valve (2), a heat exchange station primary pipe network water outlet valve (4) and a primary pipe network circulating pump (5) which are sequentially connected in series to form a loop; a primary net supply water pump (6) is connected to pipelines of the primary net water outlet valve (4) and the primary net circulating pump (5) of the heat exchange station;
the return water waste heat utilization area comprises: a primary network backwater booster pump front valve (8), a primary network backwater booster pump (9), a primary network backwater booster pump rear valve (10), a secondary network heat consumer (11) and a heat consumer backwater cut-off valve (12) which are connected in series in sequence; a pump front valve (8) of the primary network backwater booster pump is connected to pipelines of the heat exchange station (3) and the primary network water outlet valve (4) of the heat exchange station; a primary network direct supply regulating valve (7) is connected to pipelines of a front valve (8) of the primary network return water booster pump and a primary network return water booster pump (9), and the primary network direct supply regulating valve (7) is connected with a pipeline between a primary network water inlet valve (2) and the heat exchange station (3); the hot user backwater cut-off valve (12) is connected to the pipelines of the primary network water outlet valve (4) and the primary network circulating pump (5) of the heat exchange station; the backwater waste heat utilization area also comprises a communication control module; and the primary network direct supply regulating valve (7) and a primary network return water booster pump front valve (8) are connected with the communication control module.
2. The high-efficiency backwater recovery heat pump system for the centralized heating pipe network according to claim 1, characterized in that: the heat exchanger (1) on the heat source side of the primary pipe network is used for heating the circulating water of the primary pipe network by using steam circulating water or industrial waste heat of a power plant.
3. The high-efficiency backwater recovery heat pump system for the centralized heating pipe network according to claim 1, characterized in that: and the primary pipe network replenishing water pump (6) is connected with the communication control module and is used for replenishing circulating water of the primary pipe network.
4. The high-efficiency backwater recovery heat pump system for the centralized heating pipe network according to claim 1, characterized in that: the system also includes a plurality of temperature sensors and electric actuators that control the opening and closing of the valves. Each temperature sensor is connected with a communication control module, and the communication control module is connected with an electric actuator. The temperature sensor is used for monitoring the return water temperature of the circulating water of the primary pipe network after passing through the heat exchange station (3), the circulating water temperature of a secondary pipe network heat user (11), the water supply temperature of the primary pipe network water supply pump (6), the return water temperature of the primary pipe network and the like, and sending temperature data to the communication control module.
5. The high-efficiency water recovery heat pump system for the central heating pipe network according to claim 4, wherein: the communication control module can receive and read the temperature and flow data of each temperature sensor and each water pump, can judge the change with the heat demand according to sensor data to thereby can control the valve aperture of primary network direct supply governing valve (7) and primary network return water booster pump front valve (8) through changing with the heat demand and control electric actuator, with this heat supply of adjusting primary network circulating water to the secondary pipe network.
6. The high-efficiency backwater recovery heat pump system for the centralized heating pipe network according to claim 1, characterized in that: when the primary pipe network water outlet valve (4) of the heat exchange station is closed, the primary pipe network circulating water sequentially passes through the primary pipe network water inlet valve (2) of the heat exchange station, the front valve (8) of the primary pipe network return water booster pump, the primary pipe network return water booster pump (9), the rear valve (10) of the primary pipe network return water booster pump, the secondary pipe network heat user (11) and the heat user return water cut-off valve (12) to exchange heat, and returns to the primary pipe network heat source side heat exchanger (1) after being mixed with the supply water of the primary pipe network supply water pump (6) to complete circulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110534054.6A CN113375212A (en) | 2021-05-17 | 2021-05-17 | High-efficient heat pump system that retrieves of central heating pipe network return water |
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| CN202110534054.6A CN113375212A (en) | 2021-05-17 | 2021-05-17 | High-efficient heat pump system that retrieves of central heating pipe network return water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115076751A (en) * | 2022-06-21 | 2022-09-20 | 陈连祥 | Heating system and regional heating network |
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