CN112283789A - Geothermal gradient utilization heating system with low operation cost - Google Patents
Geothermal gradient utilization heating system with low operation cost Download PDFInfo
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- CN112283789A CN112283789A CN202010698493.6A CN202010698493A CN112283789A CN 112283789 A CN112283789 A CN 112283789A CN 202010698493 A CN202010698493 A CN 202010698493A CN 112283789 A CN112283789 A CN 112283789A
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- geothermal
- heat pump
- heat exchanger
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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
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention discloses a geothermal gradient utilization heating system with low operation cost, which comprises a geothermal well, a geothermal well water taking pump, a geothermal direct supply heat exchanger, a heat pump intermediate heat exchanger group, a geothermal recharging well, a water source heat pump unit, a first switching valve and a second switching valve, wherein the geothermal well water taking pump is arranged in the geothermal well, the water outlet of the geothermal well water taking pump is communicated with the water inlet of the geothermal direct supply heat exchanger through a pipeline, the water outlet of the geothermal direct supply heat exchanger is communicated with a first water inlet of the heat pump intermediate heat exchanger group through a pipeline, and the first water outlet of the heat pump intermediate heat exchanger group is communicated with the water inlet of the geothermal recharging well through a pipeline. When the heat load demand is low at the beginning and end of heating, the valve is switched, and the combined operation mode of the geothermal direct supply heat exchanger and the heat pump intermediate heat exchanger is adopted, so that the operation time of the water source heat pump unit is shortened, and the operation cost of a heating system is reduced.
Description
Technical Field
The invention relates to the technical field of geothermal energy heating, in particular to a geothermal gradient utilization heating system with low operation cost.
Background
With the continuous development of society, the demand of various countries for energy is continuously increased, and we have to find new energy sources to replace the traditional energy sources.
Geothermal energy is a relatively reliable renewable energy source relative to the instability of solar and wind energy, which makes it believed that geothermal energy may be the best alternative to coal, natural gas and nuclear energy. The development and utilization of geothermal energy have little harmful effect on the environment, so the geothermal energy is directly utilized as alternative energy, and the harmful effect on the environment can be greatly reduced.
Geothermal energy is also listed as a main task in the outline of new energy and renewable energy development in China at present, and the exploitation and utilization of geothermal energy are further expanded. The geothermal energy is used for heating, heat supply and hot water supply, is the most extensive utilization form of the geothermal energy at present, and the geothermal energy utilization in China is used for heating and hot water supply, is also developed very rapidly, and has become the most common mode in the utilization of the geothermal energy in the Jingjin area.
Disclosure of Invention
The invention aims to provide a geothermal gradient utilization heating system with low operation cost, and aims to solve the technical problems that a water source heat pump unit in a geothermal water heating system in winter has large power consumption and high operation cost.
In order to achieve the purpose, the invention adopts the following technical scheme: the invention provides a geothermal gradient utilization heating system with low operation cost, which comprises a geothermal well, a geothermal well water taking pump arranged in the geothermal well, a geothermal direct supply heat exchanger, a heat pump intermediate heat exchanger group, a geothermal recharging well, a water source heat pump unit, a first switching valve and a second switching valve, wherein the water outlet of the geothermal well water taking pump is communicated with the water inlet of the geothermal direct supply heat exchanger through a pipeline, the water outlet of the geothermal direct supply heat exchanger is communicated with a first water inlet of the heat pump intermediate heat exchanger group through a pipeline, and the first water outlet of the heat pump intermediate heat exchanger group is communicated with the water inlet of the geothermal recharging well through a pipeline: a second water outlet of the heat pump medium heat exchanger group is communicated with a first water inlet of the water source heat pump unit through a pipeline, a first water outlet of the water source heat pump unit is communicated with a water inlet of the heat pump medium circulating pump through a pipeline, a water outlet of the heat pump medium circulating pump is communicated with a first main pipe, a water outlet pipeline of the first main pipe is provided with a first branch pipe and a second branch pipe, the first branch pipe is communicated with a second water inlet of the heat pump medium heat exchanger group,
a second water outlet of the water source heat pump unit is communicated with a water inlet main pipe of a heating user through a pipeline, a water outlet of the heating user is communicated with a water inlet of a heating circulating pump through a pipeline, a water outlet of the heating circulating pump is communicated with the second main pipe, a water outlet pipeline of the second main pipe is provided with a third branch pipe and a fourth branch pipe, the third branch pipe is communicated with a second water inlet of the water source heat pump unit, the fourth branch pipe is communicated with a second water inlet of a geothermal direct supply heat exchanger,
and a pipeline between the fourth branch pipe and the second water inlet of the geothermal direct-supply heat exchanger is communicated with the second branch pipe.
Further, the first switching valve is provided on the second branch pipe.
Furthermore, a fifth branch pipe is arranged on a pipeline between a second water outlet of the heat pump intermediate heat exchanger group and a first water inlet of the water source heat pump unit, and the fifth branch pipe is communicated with a water inlet main pipe of a heating user.
Further, a second switching valve is provided on the fifth branch pipe.
Further, the heat pump intermediate heat exchanger group comprises at least two heat pump intermediate heat exchangers arranged in parallel.
Further, the water source heat pump unit comprises at least two water source heat pump units which are arranged in series.
The invention has the beneficial effects that:
according to the geothermal gradient utilization heating system with low operation cost, when the heat load demand is low at the initial stage and the final stage of heating, the operation mode of combining the geothermal direct supply heat exchanger and the heat pump intermediate heat exchanger is adopted through valve switching, so that the operation time of the water source heat pump unit is shortened, and the operation cost of the heating system is reduced.
2, when the heat load requirement is large in the middle heating period, the condenser side and the evaporator side of the multiple water source heat pump units are connected in series, so that the energy efficiency ratio of the water source heat pump units is improved, the unit operation power consumption is reduced, and the operation cost of a heating system is reduced.
3, according to the low-operation-cost geothermal gradient utilization heating system, the input operation time of the water source heat pump unit is reduced in the initial stage and the final stage of heating, the energy efficiency ratio of the water source heat pump unit is improved in the middle stage of heating, the purposes of reducing operation power consumption and reducing operation cost are achieved, and the high-operation-cost geothermal gradient utilization heating system has high foresight and advanced performance.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The primary objects and other advantages of the invention may be realized and attained by the instrumentalities particularly pointed out in the specification.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic flow diagram of the present invention.
Reference numerals: the system comprises a 1-geothermal direct supply heat exchanger, a 2-heat pump intermediate heat exchanger group, a 3-water source heat pump unit, a 4-heat pump intermediate circulating pump, a 5-heating circulating pump, a 6-geothermal well water taking pump, a 7-first switching valve, an 8-second switching valve, a 9-heating user, a 10-first branch pipe, a 11-geothermal recharging well, a 12-third branch pipe, a 13-fourth branch pipe and a 15-second branch pipe.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and illustrating the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
Example 1
1. As shown in figure 1, the invention provides a geothermal gradient utilization heating system with low operation cost, wherein a water outlet pipe of a geothermal well water taking pump 6 is connected with a geothermal direct supply heat exchanger 1, the geothermal direct supply heat exchanger 1 is connected with a heat pump intermediary heat exchanger 2, and a water outlet pipe of the heat pump intermediary heat exchanger 2 is connected with a geothermal recharging well to form a geothermal water gradient utilization system.
Specifically, including geothermal well, the geothermal well water intaking pump 6 of setting in geothermal well, geothermol power direct supply heat exchanger 1, heat pump intermediary heat exchanger group 2, geothermal recharging well 11, water source heat pump set 3, first switching valve 7 and second switching valve 8, the delivery port of geothermal well water intaking pump 6 passes through the water inlet intercommunication of pipeline and geothermol power direct supply heat exchanger 1, and the first water inlet intercommunication of pipeline and heat pump intermediary heat exchanger group 2 is passed through to the 1 delivery port of geothermal heat exchanger group, and the first delivery port of heat pump intermediary heat exchanger group 2 passes through the water inlet intercommunication of pipeline and geothermal recharging well 11: the second delivery port of heat pump medium heat exchanger group 2 passes through the pipeline and communicates with the first water inlet of water source heat pump unit 3, the first delivery port of water source heat pump unit 3 passes through the pipeline and communicates with the water inlet of heat pump medium circulating pump 4, the delivery port and the first person in charge intercommunication of heat pump medium circulating pump 4, the delivery port pipeline of first person in charge is provided with first branch pipe 10 and second branch pipe 15, first branch pipe 10 communicates with the second water inlet of heat pump medium heat exchanger group 2, constitute heat pump medium heat exchanger heating system.
The second delivery port of the water source heat pump unit 3 is communicated with the water inlet main pipe of the heating user 9 through a pipeline, the delivery port of the heating user 9 is communicated with the water inlet of the heating circulating pump 5 through a pipeline, the delivery port of the heating circulating pump 5 is communicated with the second main pipe, the delivery port pipeline of the second main pipe is provided with a third branch pipe 12 and a fourth branch pipe 13, the third branch pipe 12 is communicated with the second water inlet of the water source heat pump unit 3, and the fourth branch pipe 13 is communicated with the second water inlet of the geothermal direct supply heat exchanger 1. The pipeline between the fourth branch pipe 13 and the second water inlet of the geothermal direct-supply heat exchanger 1 is communicated with the second branch pipe 15.
Wherein the first switching valve 7 is arranged on the second branch pipe 15.
A fifth branch pipe is arranged on a pipeline between the second water outlet of the heat pump intermediate heat exchanger group 2 and the first water inlet of the water source heat pump unit 3, and the fifth branch pipe is communicated with a water inlet main pipe of a heating user 9. A second switching valve 8 is arranged in the fifth branch.
The heat pump intermediate heat exchanger group 2 comprises at least two heat pump intermediate heat exchangers arranged in parallel. The water source heat pump unit 3 includes at least two water source heat pump units arranged in series.
Through the structure, the combined operation of the geothermal direct supply heat exchanger and the heat pump intermediate heat exchanger in winter is realized, the service time of the water source heat pump unit is reduced, and meanwhile, the condenser side and the evaporator side of the water source heat pump unit are connected in series for use, so that the temperature rise difference value of two sides of each water source heat pump unit is reduced, the energy efficiency ratio COP of the heat pump units is improved, the running power consumption is reduced, and the running cost is reduced.
When the heat load demand is low in the early and late stages in winter, the geothermal direct-supply heat exchanger 1 heats the return water of the secondary side user heating system through heat exchange, the heat load demand of users is met, and the independent heating of the geothermal direct-supply heat exchanger 1 is realized.
As the heat load demand of the user increases, the intermediate heat exchanger of the heat pump and the geothermal direct-supply heat exchanger 1 adopt a combined heating mode.
With the increase of the heat load demand of users in winter, the independent heating mode of the geothermal direct supply heat exchanger 1 cannot meet the heat demand of the users, the first switching valve 7 and the second switching valve 8 are opened, and the combined heating mode of the geothermal direct supply heat exchanger 1 and the heat pump intermediate heat exchanger group 2 is adopted.
When the heat pump system enters a middle heating period in winter, the heat load demand gradually reaches a peak value, the combined heating mode of the geothermal direct supply heat exchanger 1 and the heat pump intermediate heat exchanger group 2 cannot meet the heat demand of a user, the first switching valve 7 and the second switching valve 8 are closed, geothermal water enters the heat pump intermediate heat exchanger group 2 after being subjected to heat exchange and cooling through the geothermal direct supply heat exchanger 1, the heat pump intermediate heat exchanger group 2 and the water source heat pump unit 3 are operated in a combined mode through the heat pump intermediate circulating pump 4, and the system heating capacity is improved.
Geothermal water is cooled in two stages through a geothermal direct supply heat exchanger 1 and a heat pump intermediate heat exchanger group 2 and then enters a geothermal recharging well, and the gradient utilization of the geothermal water is completed. The condenser side and the evaporator side of the water source heat pump unit 3 are respectively connected in series and used in a cascade mode, the energy efficiency ratio of the heat pump unit is increased, and low-cost operation of a geothermal heating system of a heat user is achieved.
In the process, in order to improve the energy efficiency ratio of the water source heat pump units and reduce the running power consumption, the condenser side and the evaporator side of the water source heat pump units are connected in series, so that the temperature rise difference value of the two sides of each water source heat pump unit is reduced, and the energy efficiency ratio of the units is improved. By switching the valves of the heating system, a combined heating mode of the geothermal direct supply heat exchanger 1 and the heat pump intermediate heat exchanger in the early and late periods in winter is realized, the use time of the water source heat pump unit 3 is shortened, the operation cost is reduced, and meanwhile, the condenser side and the evaporator side of the water source heat pump unit 3 are serially connected in a cascade manner, so that the temperature rise difference value of two sides of each water source heat pump unit 3 is reduced, the energy efficiency ratio COP of the heat pump units is improved, the operation power consumption is reduced, and the operation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Claims (6)
1. A low running cost's geothermol power cascade utilizes heating system which characterized in that: including geothermal well, geothermal well water intaking pump (6), geothermol power direct supply heat exchanger (1), heat pump intermediary heat exchanger group (2), geothermal recharge well (11), water source heat pump set (3), first switching valve (7) and second switching valve (8) of setting in geothermal well, the delivery port of geothermal well water intaking pump (6) passes through the water inlet intercommunication of pipeline and geothermol power direct supply heat exchanger (1), and the first water inlet intercommunication of pipeline and heat pump intermediary heat exchanger group (2) is passed through to geothermol power direct supply heat exchanger (1) delivery port, and the first delivery port of heat pump intermediary heat exchanger group (2) passes through the water inlet intercommunication of pipeline and geothermal recharge well (11): a second water outlet of the heat pump intermediate heat exchanger group (2) is communicated with a first water inlet of the water source heat pump unit (3) through a pipeline, a first water outlet of the water source heat pump unit (3) is communicated with a water inlet of the heat pump intermediate circulating pump (4) through a pipeline, a water outlet of the heat pump intermediate circulating pump (4) is communicated with a first main pipe, a first branch pipe (10) and a second branch pipe (15) are arranged on a water outlet pipeline of the first main pipe, the first branch pipe (10) is communicated with a second water inlet of the heat pump intermediate heat exchanger group (2),
a second water outlet of the water source heat pump unit (3) is communicated with a water inlet main pipe of a heating user (9) through a pipeline, a water outlet of the heating user (9) is communicated with a water inlet of a heating circulating pump (5) through a pipeline, a water outlet of the heating circulating pump (5) is communicated with a second main pipe, a water outlet pipeline of the second main pipe is provided with a third branch pipe (12) and a fourth branch pipe (13), the third branch pipe (12) is communicated with a second water inlet of the water source heat pump unit (3), the fourth branch pipe (13) is communicated with a second water inlet of the geothermal direct supply heat exchanger (1),
the pipeline between the fourth branch pipe (13) and the second water inlet of the geothermal direct supply heat exchanger (1) is communicated with the second branch pipe (15).
2. A low-running-cost geothermal cascade heating system as defined in claim 1, wherein the first switching valve (7) is provided on the second branch pipe (15).
3. The geothermal gradient utilization heating system with low operation cost as claimed in claim 1, wherein a fifth branch pipe is arranged on a pipeline between the second water outlet of the intermediate heat exchanger group (2) of the heat pump and the first water inlet of the water source heat pump group (3), and the fifth branch pipe is communicated with a main water inlet pipe of a heating user (9).
4. A low-running-cost geothermal cascade heating system according to claim 3, wherein the second switching valve (8) is provided on the fifth branch pipe.
5. The low-cost geothermal cascade heating system as recited in claim 1, wherein the heat pump intermediate heat exchanger group (2) comprises at least two heat pump intermediate heat exchangers arranged in parallel.
6. The low-cost geothermal cascade heating system according to claim 1, wherein the water source heat pump unit (3) comprises at least two water source heat pump units arranged in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010698493.6A CN112283789A (en) | 2020-07-20 | 2020-07-20 | Geothermal gradient utilization heating system with low operation cost |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010698493.6A CN112283789A (en) | 2020-07-20 | 2020-07-20 | Geothermal gradient utilization heating system with low operation cost |
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| CN112283789A true CN112283789A (en) | 2021-01-29 |
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| CN202010698493.6A Pending CN112283789A (en) | 2020-07-20 | 2020-07-20 | Geothermal gradient utilization heating system with low operation cost |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110109352A (en) * | 2010-03-31 | 2011-10-06 | 대성히트펌프 주식회사 | Airconditining and hot water supplying applratus for heat pump system using geothermy |
| CN102679433A (en) * | 2012-05-23 | 2012-09-19 | 烟台蓝德空调工业有限责任公司 | Combined heating system capable of utilizing geothermal water and water source heat pump in stage mode |
| CN203928082U (en) * | 2014-05-27 | 2014-11-05 | 中石化绿源地热能开发有限公司 | The multistage heating system of a kind of GEOTHERMAL WATER associating water resource heat pump |
| CN210425635U (en) * | 2019-06-26 | 2020-04-28 | 张玉峰 | Heat pump heating system for gradient utilization of deep geothermal heat |
| CN111189099A (en) * | 2019-12-19 | 2020-05-22 | 陕西省煤田地质集团有限公司 | Efficient heating system for ground heating engineering for developing and utilizing pumping and filling type geothermal water |
| CN210624678U (en) * | 2019-06-19 | 2020-05-26 | 河北绿源地热能开发有限公司 | Heat storage type geothermal efficient centralized heating system |
-
2020
- 2020-07-20 CN CN202010698493.6A patent/CN112283789A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110109352A (en) * | 2010-03-31 | 2011-10-06 | 대성히트펌프 주식회사 | Airconditining and hot water supplying applratus for heat pump system using geothermy |
| CN102679433A (en) * | 2012-05-23 | 2012-09-19 | 烟台蓝德空调工业有限责任公司 | Combined heating system capable of utilizing geothermal water and water source heat pump in stage mode |
| CN203928082U (en) * | 2014-05-27 | 2014-11-05 | 中石化绿源地热能开发有限公司 | The multistage heating system of a kind of GEOTHERMAL WATER associating water resource heat pump |
| CN210624678U (en) * | 2019-06-19 | 2020-05-26 | 河北绿源地热能开发有限公司 | Heat storage type geothermal efficient centralized heating system |
| CN210425635U (en) * | 2019-06-26 | 2020-04-28 | 张玉峰 | Heat pump heating system for gradient utilization of deep geothermal heat |
| CN111189099A (en) * | 2019-12-19 | 2020-05-22 | 陕西省煤田地质集团有限公司 | Efficient heating system for ground heating engineering for developing and utilizing pumping and filling type geothermal water |
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Application publication date: 20210129 |