CN112781091A - Heat recovery system for multistage circulating water heat supply - Google Patents
Heat recovery system for multistage circulating water heat supply Download PDFInfo
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- CN112781091A CN112781091A CN202011626978.0A CN202011626978A CN112781091A CN 112781091 A CN112781091 A CN 112781091A CN 202011626978 A CN202011626978 A CN 202011626978A CN 112781091 A CN112781091 A CN 112781091A
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- heat
- heat exchange
- water
- water supply
- building
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 238000011084 recovery Methods 0.000 title claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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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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- 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
- 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
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat 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
- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/02—Fluid distribution means
- F24D2220/0235—Three-way-valves
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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
Abstract
The invention relates to a heat recovery system for supplying heat by multistage circulating water, which realizes the heat supply of the circulating water between a heat source and a building through a water supply pipeline and a water return pipeline, a heat exchange station and a heat exchange system are arranged between the heat source and the building, a multistage circulating water loop is generated between the building and the heat source, wherein the heat exchange station is arranged between the heat source and the building, the heat supply from the heat source passes through the heat exchange station and the heat exchange system to form a primary water supply loop, and hot water among the heat exchange station, the heat exchange system and the building is circulated to form a secondary water. Compared with the prior art, the invention has the beneficial effects that: the energy conversion efficiency is improved, the cost is reduced, and remarkable social and economic benefits are brought.
Description
Technical Field
The invention relates to the field of building heating system control, in particular to a heat recovery system for multi-stage circulating water heating.
Background
The existing design is in the heating system of high-rise building, especially the building that the building is higher or the building area is huge, because of the heating pipeline overlength for the temperature difference of heat supply entry and heat supply export is big, and the room that is close to heat supply entry and heat supply export appears cold and hot uneven problem, and present improvement mode is incessant heat supply, and regional heat supply exchange station's primary return water temperature is higher, and this kind of heating mode can cause and consume more energy, does not accord with the requirement of environmental protection.
Disclosure of Invention
In order to solve the problem, the present invention provides a heat recovery system integrating multi-stage cycle heat exchange and a heat pump, which reduces the cost of heat supply and increases the energy utilization efficiency, so as to solve the problems in the background art.
A heat recovery system integrated with a heat pump realizes hot water circulation between a heat source and a building through a water supply pipeline and a water return pipeline, a heat exchange station and a heat exchange system are configured to generate a multi-stage water supply loop between the building and the heat source, wherein the heat exchange station is configured between the heat source and the building, heat supply starts from the heat source, passes through the heat exchange station and the heat exchange system to form a primary water supply loop, and hot water circulation among the heat exchange station, the heat exchange system and the building generates a secondary water supply loop;
the heat exchange system comprises a heat exchange station, an evaporator and a condenser, wherein a compressor and an expansion valve are arranged between the evaporator and the condenser to realize heat exchange.
Furthermore, the system also comprises a three-way regulating valve, and the three-way regulating valve is arranged on the secondary water return pipeline to enable return water to flow through the condenser.
Furthermore, a three-way regulating valve is arranged on the primary water supply loop and used for enabling return water to flow through the evaporator, and the return water of the primary water supply loop and the return water of the secondary water supply loop exchange heat again between the evaporator and the condenser.
Furthermore, the three-way regulating valve is arranged on the return pipeline and used for controlling the water flow passing through the evaporator and the condenser.
Furthermore, the heat exchange system is used for sending heat generated by the primary water supply loop to the condenser through the compressor and the expansion valve by the evaporator and exchanging the heat to the secondary water supply loop.
Further, the heat exchange system is a digital intelligent system.
Furthermore, the digital intelligent system comprises two three-way regulating valves, a heat exchanger and a heat pump system, the digital intelligent system controls the three-way regulating valves, water on the secondary side enters the heat exchanger and a condenser of the heat pump system through the three-way regulating valves, and return water on the primary side enters the heat exchanger and an evaporator of the heat pump system.
Furthermore, the digital intelligent system controls the three-way regulating valve to ensure that the return water of the primary side and the secondary side directly returns to the heat source without passing through the second-stage heat exchanger and the heat pump system.
Compared with the prior art, the invention has the beneficial effects that: the energy conversion efficiency is improved, and the heat supply operation cost is reduced.
Drawings
FIG. 1 is a schematic view of a heat recovery system of an embodiment of the present invention.
FIG. 2 is a diagram of the heating coefficient of the system according to an embodiment of the present invention.
Detailed Description
The following will clearly and completely describe the apparatus and the calculation method in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, in the conventional heating system, hot water is circulated between a heat source and a building through a water supply pipe and a water return pipe. The scheme of the invention achieves the purpose of improving the heat supply efficiency by arranging the heat exchange station and the heat exchange system and arranging the multi-stage water supply loop between the building and the heat source.
In the embodiment of the invention, a heat exchange station 10 is arranged between a heat source and a building, heat supply from the heat source passes through the heat exchange station and a heat exchange system to form a primary side water supply loop, and hot water circulation among the heat exchange station, the heat exchange system and the building generates a secondary side water supply loop.
The heat exchange system comprises a heat exchange station 10, an evaporator 20 and a condenser 30, wherein a compressor 60 and an expansion valve 90 are arranged between the evaporator and the condenser to realize heat exchange.
The heat exchange system in the embodiment of the invention is a digital intelligent system.
The main control computer or the server is configured to control the three-way regulating valve in the system, the three-way regulating valve is an electronic three-way regulating valve capable of realizing wireless communication, and the on-off and the passage of the three-way regulating valve are controlled through control software.
The digital intelligent system comprises two three-way regulating valves, a heat exchanger and a heat pump system, wherein the digital intelligent system controls the three-way regulating valves, water on the secondary side enters the heat exchanger and a condenser of the heat pump system through the three-way regulating valves, and return water on the primary side enters the heat exchanger and an evaporator of the heat pump system.
The digital intelligent system controls the three-way regulating valve to ensure that the return water on the primary side and the secondary side directly returns to the heat source without passing through the second-stage heat exchanger and the heat pump system.
In the embodiment of the invention, the source of the heat source is a heat supply company or a heat supply factory, and hot water is generated by a boiler and supplied to a residential area. In the embodiment of the invention, the system is simplified, hot water produced by a heating company is used as a heat source, and residential areas are marked as buildings.
The following examples are given by way of illustration of the invention with hot water supplied at 80 ℃.
In the primary side circulating water heat supply loop, a heat source passes through the heat exchange station 10 and the evaporator 20 and then returns to the heat source, the temperature of main water supplied by the heat source is set to be 80 ℃, and the temperature of return water after passing through the first-stage heat exchange station is 40 ℃. Then passes through a heat exchanger of a second-stage heat exchange station, the temperature is 37 ℃, then passes through a heat pump evaporator 20, the temperature of return water is reduced to 30 ℃, and the return water is recycled in a heat supply factory.
In the secondary side circulating water heat supply loop, the water supply temperature is 45 ℃, the temperature of the return water flowing out of the building is 35 ℃, the return water passes through the three-way regulating valve 50a, passes through the heat exchanger of the second-stage heat exchange station, is increased from 35 ℃ to 38 ℃, passes through the heat pump condenser 30, is increased from 35 ℃ to 45 ℃, and is then supplied to the building 100.
As shown in fig. 2, there are several technical parameters in the present example combined with the above:
the primary water supply and return temperature of the primary side is 80 ℃ and 40 ℃;
the secondary side water supply and return temperature is 45 ℃ and 35 ℃;
2 ℃ approach heat exchanger design: hot side: at 37 ℃ and 40 ℃; and (3) cold testing: 35 ℃ and 38 ℃;
a heat pump: cold measuring at 37 deg.C and 30 deg.C; hot side: at 38 ℃ and 45 ℃;
condenser and evaporator at approximately 2 ℃: condensation temperature 47 ℃, evaporation temperature 28 ℃, heat pump lift: 19 ℃ is adopted.
In the prior art, the return water temperature is typically above 40 ℃. The high return water temperature causes the following problems:
1. the heating capacity of the district heating system is insufficient, and the number of end users is limited. This greatly reduces the revenue for heating system companies.
2. The pump power consumption is excessive. The actual pump power may be several times the optimum power.
3. The use of low temperature energy is limited. This greatly reduces the revenue for heating companies.
Based on the principle set forth in the invention, the performance indexes of the embodiment of the invention can be summarized as follows:
COP index: for ammonia machines, up to 12, for R-22 machines, up to more than 8;
for the same main system flow, the system capacity is increased by 25% (80-40 to 80-30);
no high temperature heat source is added, such as low pressure air extraction;
since most heat exchange stations are not directly connected to the residential building, an ammonia machine can be used, which will ensure a higher COP and lower cost.
In the embodiment of the present invention, the primary-side water supply circuit performs the first heat exchange from the heat source to the first heat exchange station 10 through the water supply line. The three-way regulating valve 50b is installed on the primary side water supply circuit, and allows the hot water exchanged from the heat exchange station 10 to be transferred to the second heat exchange station to perform the second heat exchange. The return water of the second heat exchange station passes through the evaporator 20, is sent to the condenser through the compressor and the expansion valve, and carries out third heat exchange with the water of the secondary side water supply loop.
In the embodiment of the present invention, the secondary water supply loop supplies heat from the first heat exchanging station through the building 100 and then enters the water return line, the three-way adjusting valve 50a on the water return line allows the return water to flow through the second heat exchanging station for the second heat exchange, and then the return water passes through the condenser 30 for the third heat exchange with the hot water in the primary water supply loop and then is delivered to the water supply line for supplying heat to the building 100.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A heat recovery system of a multistage circulating water heat supply loop realizes hot water circulation between a heat source and a building through a water supply pipeline and a water return pipeline, and is characterized in that a heat exchange station and a heat exchange system are configured and used for generating the multistage circulating water loop between the building and the heat source, wherein the heat exchange station is configured between the heat source and the building, the heat exchange station and the heat exchange system form a primary water supply loop from the heat source, and hot water circulation among the heat exchange station, the heat exchange system and the building generates a secondary water supply loop;
the heat exchange system comprises a heat exchange station, an evaporator and a condenser, wherein a compressor and an expansion valve are arranged between the evaporator and the condenser and used for realizing heat exchange.
2. A heat recovery system according to claim 1 further comprising a three-way regulating valve mounted on the secondary water supply loop to allow return water to flow through the condenser.
3. The heat recovery system of claim 2, wherein a three-way regulating valve is installed in the primary water supply circuit for allowing return water to flow through the evaporator, and return water of the primary water supply circuit and the secondary water supply circuit is heat exchanged again between the evaporator and the condenser.
4. A heat recovery system as claimed in claim 3, wherein the three-way regulating valve is mounted on the return line for controlling the flow of water through the evaporator and the condenser.
5. The heat recovery system of claim 1, wherein the heat exchange system is configured to transfer heat generated by the primary water supply circuit from the evaporator to the condenser via the compressor and the expansion valve to the secondary water supply circuit.
6. The heat recovery system of claim 1, wherein the heat exchange system is a digital intelligent system that is digital.
7. The heat recovery system of claim 6, wherein the digital intelligent system comprises two three-way regulating valves, a heat exchanger and a heat pump system, the digital intelligent system controls the three-way regulating valves, the secondary side water enters the heat exchanger and the condenser of the heat pump system through the three-way regulating valves, and the primary side return water enters the heat exchanger and the evaporator of the heat pump system.
8. The heat recovery system of claim 6 wherein the digital intelligence system controls the three-way regulating valve to return the primary and secondary return water directly to the heat source without passing through the secondary heat exchanger and the heat pump system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011626978.0A CN112781091A (en) | 2020-12-30 | 2020-12-30 | Heat recovery system for multistage circulating water heat supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011626978.0A CN112781091A (en) | 2020-12-30 | 2020-12-30 | Heat recovery system for multistage circulating water heat supply |
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| Publication Number | Publication Date |
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| CN112781091A true CN112781091A (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011626978.0A Pending CN112781091A (en) | 2020-12-30 | 2020-12-30 | Heat recovery system for multistage circulating water heat supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115218252A (en) * | 2022-07-11 | 2022-10-21 | 朴瑞(北京)企业管理有限公司 | Intelligent efficient heat exchange system for urban energy-saving heat supply |
-
2020
- 2020-12-30 CN CN202011626978.0A patent/CN112781091A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115218252A (en) * | 2022-07-11 | 2022-10-21 | 朴瑞(北京)企业管理有限公司 | Intelligent efficient heat exchange system for urban energy-saving heat supply |
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