CN214249932U - Water-ring multi-connected air conditioning system utilizing shallow geothermal energy - Google Patents

Water-ring multi-connected air conditioning system utilizing shallow geothermal energy Download PDF

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Publication number
CN214249932U
CN214249932U CN202120165714.3U CN202120165714U CN214249932U CN 214249932 U CN214249932 U CN 214249932U CN 202120165714 U CN202120165714 U CN 202120165714U CN 214249932 U CN214249932 U CN 214249932U
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water
shallow geothermal
stop valve
air
heat exchange
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赵民
李杨
薛洁
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China Northwest Architecture Design and Research Institute Co Ltd
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China Northwest Architecture Design and Research Institute Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/40Geothermal heat-pumps
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/10Geothermal energy

Abstract

The utility model provides a pair of utilize water ring multiple air conditioning system of shallow geothermal energy, including multiple air conditioner heat pump set, shallow geothermal heat transfer well, circulating water pump, first stop valve, second stop valve, feed pipe, wet return, third stop valve, fourth stop valve, cooling tower and natural gas boiler. In the building, each user adopts a multi-connected air-conditioning heat pump unit as a cold and heat source, each user can flexibly arrange indoor tail ends according to use requirements and space division, a cooling mode that shallow geothermal energy is used as a main mode and a cooling tower is used as an auxiliary mode is adopted in the summer cold supply working condition, and cooled circulating water absorbs heat at a condensation side of the unit, so that the condensation temperature is reduced, and the refrigeration efficiency of the unit is improved; in winter, the heating working condition adopts a heating mode that shallow geothermal energy is taken as a main mode and a natural gas boiler is taken as an auxiliary mode, and heated circulating water releases heat at the evaporation side of the unit, so that the evaporation temperature is increased, the heating efficiency of the unit is further improved, renewable energy sources are fully utilized, and the energy consumption of the building is reduced.

Description

Water-ring multi-connected air conditioning system utilizing shallow geothermal energy
Technical Field
The utility model belongs to air conditioning system, concretely relates to utilize shallow geothermal energy's water ring multiple air conditioning system.
Background
The air conditioning system is a system for processing the temperature, humidity, cleanliness and airflow speed of indoor air by a manual method, and can make certain places obtain air with certain temperature, humidity and air quality so as to meet the requirements of users and production processes and improve labor hygiene and indoor climate conditions. For a large public building, a centralized air conditioning system or a semi-centralized air conditioning system is often adopted, both the centralized air conditioning system and the semi-centralized air conditioning system adopt centralized cold and heat source units, and compared with the small air conditioners which are dispersedly arranged in each room, the large unit has higher refrigerating or heating efficiency, but the local regulation and control performance and the use flexibility are weaker.
The multi-connected air-conditioning heat pump unit consists of an outdoor unit and a plurality of indoor units, energy conversion and transmission are carried out by depending on flowing of a refrigerant, the multi-connected air-conditioning heat pump unit has higher energy efficiency compared with a split air conditioner, has better use flexibility compared with a large water chilling unit, particularly on the arrangement of indoor tail ends, the large water chilling unit needs to carry out air-conditioning system design on the whole building, the multi-connected air-conditioning heat pump unit only needs to reserve the installation position of the outdoor unit, the indoor tail ends can be flexibly arranged, and the multi-connected air-conditioning heat pump unit has a heating function.
The shallow geothermal energy is an intangible natural resource accumulated in 200 meters under the earth surface, is a product of combined action of heat conduction and heat convection in the deep part of the earth and solar radiation, is energy formed by year-round temperature difference between the temperature in the depth of 200 meters under the earth surface and the temperature of air under the condition that the air is not directly irradiated by sunlight at a position 1.5m away from the earth surface, is potential energy existing between two temperature fields with different states, is also called shallow geothermal energy, and belongs to a part of geothermal resources. The shallow geothermal energy has the characteristics of being recyclable, clean, environment-friendly, wide in distribution, large in reserve, shallow in burial, capable of being developed and utilized nearby and the like, and can be used as a substitute resource of fossil energy, save energy and reduce emission.
Disclosure of Invention
An object of the utility model is to provide an utilize water ring multiple air conditioning system of shallow geothermal energy, each user adopts multiple air conditioning heat pump set as cold and hot source in the building, can arrange indoor end according to user demand and space division are nimble, adopts the shallow geothermal energy to be the cooling mode of giving first place to, cooling tower is assisted during the cooling operating mode in summer, and the circulating water after the cooling absorbs heat at the unit condensation side, reduces the condensation temperature, and then improves the refrigeration efficiency of unit; in winter, the heating working condition adopts a heating mode that shallow geothermal energy is taken as a main mode and a natural gas boiler is taken as an auxiliary mode, and heated circulating water releases heat at the evaporation side of the unit, so that the evaporation temperature is increased, the heating efficiency of the unit is further improved, renewable energy sources are fully utilized, and the energy consumption of the building is reduced.
In order to achieve the above purpose, the utility model adopts the technical proposal that:
a water ring multi-connected air conditioning system utilizing shallow geothermal energy is characterized in that: the system comprises a multi-connected air-conditioning heat pump unit, a shallow geothermal heat exchange well, a circulating water pump, a first stop valve, a second stop valve, a water supply pipe, a water return pipe, a third stop valve, a fourth stop valve, a cooling tower and a natural gas boiler;
the water outlet of the shallow geothermal heat exchange well is connected with a natural gas boiler, the natural gas boiler is further connected with a water feeding pipe, the water return port of the shallow geothermal heat exchange well is connected with a water return pipe, the water outlet of the natural gas boiler and the water return port of the shallow geothermal heat exchange well are respectively provided with a second stop valve and a first stop valve, the water feeding pipe is provided with a circulating water pump, and the water feeding pipe and the water return pipe are connected in parallel with a plurality of multi-connected air-conditioning heat pump units;
a plurality of cooling towers are also connected in parallel on the water supply pipe and the water return pipe, and a water outlet and a water return port of each cooling tower are respectively provided with a fourth stop valve and a third stop valve;
the system comprises a plurality of shallow geothermal heat exchange wells, wherein the depth of a single shallow geothermal heat exchange well is 100-120 m, and the horizontal distance between the shallow geothermal heat exchange well and the shallow geothermal heat exchange well is 3-6 m.
The multi-connected air-conditioning heat pump unit comprises an outdoor unit and an indoor tail end, wherein the outdoor unit is arranged in an equipment room of a building, and the indoor tail end consists of a plurality of indoor units distributed in an air-conditioning room;
the outdoor unit comprises a compressor, a four-way reversing valve, a drying filter, an outdoor heat exchanger, a liquid storage device and an electronic expansion valve;
the indoor machine is connected with the V2 end of the four-way reversing valve, the V1 end of the four-way reversing valve is connected with the compressor, the compressor is connected with the drying filter, the drying filter is connected with the V3 end of the four-way reversing valve, the V4 end of the four-way reversing valve is connected with the outdoor heat exchanger, the outdoor heat exchanger is connected with the liquid storage device, the liquid storage device is connected with the electronic expansion valve, and the electronic expansion valve is connected with the indoor machine;
the outdoor heat exchanger is also connected with a water supply pipe and a water return pipe.
The water-ring multi-connected air conditioning system adopts a plurality of shallow geothermal heat exchange wells, and each shallow geothermal heat exchange well comprises a ground heat exchanger, a geothermal well water outlet and a geothermal well water return port.
The ground heat exchanger is a U-shaped heat exchange coil.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses an utilize water ring multiple air conditioning system of shallow geothermal energy, the indoor adoption of building is a plurality of multiple air conditioner heat pump set as cold and hot sources, and the off-premises station can concentrate and place in the equipment room, and the indoor set can carry out nimble setting according to the space division in later stage air conditioner room, especially to the more office building of user, each user can be according to the demand, and the arrangement of air conditioner end is decided voluntarily, and the live time of deciding the air conditioner voluntarily is favorable to each user's air conditioner energy consumption statistics and expense settlement;
further, under the cooling working condition in summer, the utility model discloses a shallow geothermal energy absorbs heat at the multiple air conditioner heat pump unit condensation side through the cold water that provides after the heat transfer, reduces the condensation temperature, and then improves multiple air conditioner heat pump unit's refrigeration efficiency, and when the cooling ability of shallow geothermal energy is not enough, adopt the cooling tower to assist cooling circulating water, and conventional multiple air conditioner heat pump unit releases the heat to the air, but the air temperature generally will be higher than the temperature of cooling tower circulating water, is unfavorable for unit condensation side heat dissipation;
further, under the winter heat supply operating mode, the utility model discloses a shallow geothermol power is exothermic in the multiple air conditioner heat pump set evaporation side through the hot water that provides behind the heat transfer, improves evaporating temperature, and then improves multiple air conditioner heat pump set's the efficiency that heats, and when the heating capacity of shallow geothermol power is not enough, adopts natural gas boiler auxiliary heating intensification circulating water, and conventional multiple air conditioner heat pump set uses the air to absorb the heat as the low-order heat source, causes the unit evaporation side very easily to freeze and heats the efficiency decline.
Drawings
Fig. 1 is a schematic view of a water-loop multi-connected air conditioning system using shallow geothermal energy according to the present invention;
FIG. 2 is a schematic layout view of the multi-connected air-conditioning heat pump unit of the present invention;
FIG. 3 is a schematic view of the multi-connected air-conditioning heat pump unit of the present invention;
fig. 4 is a schematic view of a ground heat exchanger of the shallow geothermal heat exchange well of the present invention;
the system comprises an outdoor unit 1, a compressor 101, a four-way reversing valve 102, a drying filter 103, an outdoor heat exchanger 104, a liquid storage 105, an electronic expansion valve 106, an indoor end 2, an indoor unit 201, a multi-connected air-conditioning heat pump unit 3, a shallow geothermal heat exchange well 4, a buried pipe heat exchanger 401, a geothermal well water outlet 402, a geothermal well water return port 403, a circulating water pump 5, a first stop valve 6, a second stop valve 7, a water supply pipe 8, a water return pipe 9, a third stop valve 10, a fourth stop valve 11, a cooling tower 12 and a natural gas boiler 13.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model discloses general idea is: a water-ring multi-connected air conditioning system utilizing shallow geothermal energy is characterized in that each user in a building adopts a multi-connected air conditioning heat pump unit as a cold and heat source, each user can flexibly arrange indoor tail ends according to use requirements and space division, a cooling mode with shallow geothermal energy as a main mode and a cooling tower as an auxiliary mode is adopted in the summer cold supply working condition, cooled circulating water absorbs heat at a condensation side of the unit, the condensation temperature is reduced, and the refrigeration efficiency of the unit is further improved; in winter, the heating working condition adopts a heating mode that shallow geothermal energy is taken as a main mode and a natural gas boiler is taken as an auxiliary mode, and heated circulating water releases heat at the evaporation side of the unit, so that the evaporation temperature is increased, the heating efficiency of the unit is further improved, renewable energy sources are fully utilized, and the energy consumption of the building is reduced.
For the purpose of illustrating the technical content and the construction and purpose of the present invention in detail, reference will now be made in detail to the accompanying drawings.
As shown in fig. 1, a water-loop multi-connected air conditioning system using shallow geothermal energy is characterized in that: the system comprises a multi-connected air-conditioning heat pump unit 3, a shallow geothermal heat exchange well 4, a circulating water pump 5, a first stop valve 6, a second stop valve 7, a water supply pipe 8, a water return pipe 9, a third stop valve 10, a fourth stop valve 11, a cooling tower 12 and a natural gas boiler 13;
a water outlet of the shallow geothermal heat exchange well 4 is connected with a natural gas boiler 13, the natural gas boiler 13 is connected with a water feeding pipe 8, a water return port of the shallow geothermal heat exchange well 4 is connected with a water return pipe 9, a water outlet of the natural gas boiler 13 and the water return port of the shallow geothermal heat exchange well 4 are respectively provided with a second stop valve 7 and a first stop valve 6, a circulating water pump 5 is arranged on the water feeding pipe 8, and the water feeding pipe 8 and the water return pipe 9 are connected with a plurality of multi-connected air-conditioning heat pump units 3 in parallel;
a plurality of cooling towers 12 are also connected in parallel on the water supply pipe 8 and the water return pipe 9, and a water outlet and a water return port of each cooling tower 12 are respectively provided with a fourth stop valve 11 and a third stop valve 10;
the system comprises a plurality of shallow geothermal heat exchange wells 4, the depth of each shallow geothermal heat exchange well 4 is 100-120 m, and the horizontal distance between each shallow geothermal heat exchange well 4 and each shallow geothermal heat exchange well 4 is 3-6 m.
As can be seen from fig. 2 and 3, the multi-connected air-conditioning heat pump unit 3 includes an outdoor unit 1 and an indoor end 2, the outdoor unit 1 is disposed in an equipment room of a building, and the indoor end 2 is composed of a plurality of indoor units 201 distributed in an air-conditioning room;
the outdoor unit 1 comprises a compressor 101, a four-way reversing valve 102, a drying filter 103, an outdoor heat exchanger 104, a liquid storage device 105 and an electronic expansion valve 106;
the indoor machine 201 is connected with the V2 end of the four-way reversing valve 102, the V1 end of the four-way reversing valve 102 is connected with the compressor 101, the compressor 101 is connected with the drying filter 103, the drying filter 103 is connected with the V3 end of the four-way reversing valve 102, the V4 end of the four-way reversing valve 102 is connected with the outdoor heat exchanger 104, the outdoor heat exchanger 104 is connected with the liquid storage device 105, the liquid storage device 105 is connected with the electronic expansion valve 106, and the electronic expansion valve 106 is connected with the indoor machine 201;
the outdoor heat exchanger 104 is also connected to a water supply pipe 8 and a water return pipe 9.
The water-ring multi-connected air conditioning system adopts a plurality of shallow geothermal heat exchange wells 4, and the shallow geothermal heat exchange wells 4 comprise ground heat exchangers 401, geothermal well water outlets 402 and geothermal well water return ports 403.
As can be seen from fig. 4, the ground heat exchanger 401 is a U-shaped heat exchange coil.
The utility model discloses an utilize water ring multiple air conditioning system's of shallow geothermal energy application method as follows:
(1) cooling condition in summer
And (3) opening the first stop valve 6, the second stop valve 7 and the circulating water pump 5, and selectively opening or closing each multi-connected air-conditioning heat pump unit 3 in the building according to the requirements of users. Under the drive of the circulating water pump 5, cold water from the shallow geothermal heat exchange well 4 is conveyed to the outdoor units 1 of the multi-connected air-conditioning heat pump units 3 through the water supply pipes 8, the outdoor units 1 radiate heat to the cold water, then the cold water is supplied to air-conditioning rooms at the indoor units 201, and the water radiated and heated at the outdoor units 1 flows back to the shallow geothermal heat exchange well 4 through the water return pipes 9 to be cooled again by the shallow geothermal energy. When the water outlet temperature is high due to insufficient cooling capacity in the shallow geothermal heat exchange well 4, the third stop valve 10 and the fourth stop valve 11 are opened, the cooling tower 12 is started, part of circulating water is cooled by the cooling tower 12, and the shallow geothermal energy is assisted to cool the water circulation pipeline of the air conditioning system.
Wherein, the refrigerant pipeline of the multi-connected air-conditioning heat pump unit 3 operates in such a way that the V2 end and the V3 end of the four-way reversing valve 102 are communicated, the V1 end and the V4 end are communicated, the outdoor heat exchanger 104 uses cold water from the ground heat exchanger 401 or the cooling tower 12 as a cold source, the internal refrigerant condenses and releases heat to become a medium-temperature high-pressure liquid refrigerant, the medium-temperature high-pressure liquid refrigerant enters the liquid reservoir 105, the liquid reservoir 105 can store redundant refrigerant when the refrigerant flow changes, the medium-temperature low-pressure liquid refrigerant is changed by the throttling action of the electronic expansion valve 106, the medium-temperature low-pressure liquid refrigerant enters the indoor unit 201 to evaporate and absorb heat to become a low-temperature low-pressure gaseous refrigerant, thereby achieving the purpose of refrigeration, the low-temperature low-pressure gaseous refrigerant enters the compressor 101 through the four-way reversing valve 102 and the drying filter 103 to be compressed into a high-temperature high-pressure gaseous refrigerant, the dry filter 103 is used to filter the liquid refrigerant entrained in the gaseous refrigerant, and the high-temperature and high-pressure gaseous refrigerant returns to the outdoor heat exchanger 104 again to condense and release heat.
(2) Winter heating conditions
And closing the third stop valve 10, the fourth stop valve 11 and the cooling tower 12, opening the first stop valve 6, the second stop valve 7 and the circulating water pump 5, and selectively opening or closing each multi-connected air-conditioning heat pump unit 3 in the building according to the requirements of users. Under the drive of the circulating water pump 5, hot water from the shallow geothermal heat exchange well 4 flows out through a geothermal well water outlet 402 of the buried pipe heat exchanger 401 and is conveyed to the outdoor unit 1 of each multi-connected air-conditioning heat pump unit 3 through a water supply pipe 8, after the outdoor unit 1 absorbs low-grade heat of the hot water, heat is supplied to an air-conditioning room at the indoor unit 201, and the water which absorbs heat and is cooled at the outdoor unit 1 flows back to the shallow geothermal heat exchange well 4 through a water return pipe 9 and a geothermal well water return port 403 of the buried pipe heat exchanger 401 to be heated again by shallow geothermal energy. When the temperature of the outlet water is low due to insufficient heat supply of the shallow geothermal heat exchange well 4, the natural gas boiler 13 is started for auxiliary heating.
The refrigerant pipeline of the multi-connected air-conditioning heat pump unit 3 operates in such a way that the V1 end and the V2 end of the four-way reversing valve 102 are connected, the V3 end and the V4 end are connected, the outdoor heat exchanger 104 uses hot water in the water supply pipe 8 as a heat source, the internal liquid refrigerant evaporates and absorbs heat to become a low-temperature low-pressure gaseous refrigerant, the low-temperature low-pressure gaseous refrigerant enters the compressor 101 through the four-way reversing valve 102 and the drying filter 103 to be compressed into a high-temperature high-pressure gaseous refrigerant, the drying filter 103 is used for filtering the liquid refrigerant carried in the gaseous refrigerant, then the high-temperature high-pressure gaseous refrigerant enters the indoor unit 201 to be condensed and release heat to become a medium-temperature high-pressure liquid refrigerant, thereby achieving the heating purpose, the medium-temperature high-pressure liquid refrigerant is changed into a medium-temperature low-pressure liquid refrigerant through the throttling action of the electronic expansion valve 106, the medium-temperature low-pressure liquid refrigerant returns to the outdoor heat exchanger 104 again to absorb heat through the reservoir 105, the accumulator 105 may store an excess refrigerant when the refrigerant flow rate changes.

Claims (3)

1. A water ring multi-connected air conditioning system utilizing shallow geothermal energy is characterized in that: the system comprises a multi-connected air-conditioning heat pump unit (3), a shallow geothermal heat exchange well (4), a circulating water pump (5), a first stop valve (6), a second stop valve (7), a water supply pipe (8), a water return pipe (9), a third stop valve (10), a fourth stop valve (11), a cooling tower (12) and a natural gas boiler (13);
a water outlet of the shallow geothermal heat exchange well (4) is connected with a natural gas boiler (13), the natural gas boiler (13) is connected with a water supply pipe (8), a water return port of the shallow geothermal heat exchange well (4) is connected with a water return pipe (9), a water outlet of the natural gas boiler (13) and the water return port of the shallow geothermal heat exchange well (4) are respectively provided with a second stop valve (7) and a first stop valve (6), a circulating water pump (5) is arranged on the water supply pipe (8), and a plurality of multi-connected air-conditioning heat pump units (3) are connected in parallel between the water supply pipe (8) and the water return pipe (9);
a plurality of cooling towers (12) are also connected in parallel on the water supply pipe (8) and the water return pipe (9), and a water outlet and a water return port of each cooling tower (12) are respectively provided with a fourth stop valve (11) and a third stop valve (10);
the system comprises a plurality of shallow geothermal heat exchange wells (4), wherein the depth of a single shallow geothermal heat exchange well (4) is 100-120 m, and the horizontal distance between the shallow geothermal heat exchange well (4) and the shallow geothermal heat exchange well (4) is 3-6 m.
2. The water-ring multi-connected air conditioning system using shallow geothermal energy according to claim 1, wherein: the multi-connected air-conditioning heat pump unit (3) comprises an outdoor unit (1) and an indoor tail end (2), wherein the outdoor unit (1) is arranged in an equipment room of a building, and the indoor tail end (2) is composed of a plurality of indoor units (201) distributed in an air-conditioning room;
the outdoor unit (1) comprises a compressor (101), a four-way reversing valve (102), a drying filter (103), an outdoor heat exchanger (104), a liquid storage device (105) and an electronic expansion valve (106);
the indoor unit (201) is connected with a V2 end of a four-way reversing valve (102), a V1 end of the four-way reversing valve (102) is connected with a compressor (101), the compressor (101) is connected with a drying filter (103), the drying filter (103) is connected with a V3 end of the four-way reversing valve (102), a V4 end of the four-way reversing valve (102) is connected with an outdoor heat exchanger (104), the outdoor heat exchanger (104) is connected with a liquid storage device (105), the liquid storage device (105) is connected with an electronic expansion valve (106), and the electronic expansion valve (106) is connected with the indoor unit (201);
the outdoor heat exchanger (104) is also connected with a water supply pipe (8) and a water return pipe (9).
3. The water-ring multi-connected air conditioning system using shallow geothermal energy according to claim 1, wherein: the shallow geothermal heat exchange well (4) comprises a ground heat exchanger (401), a geothermal well water outlet (402) and a geothermal well water return port (403), wherein the ground heat exchanger (401) is a U-shaped heat exchange coil.
CN202120165714.3U 2021-01-21 2021-01-21 Water-ring multi-connected air conditioning system utilizing shallow geothermal energy Active CN214249932U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120165714.3U CN214249932U (en) 2021-01-21 2021-01-21 Water-ring multi-connected air conditioning system utilizing shallow geothermal energy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120165714.3U CN214249932U (en) 2021-01-21 2021-01-21 Water-ring multi-connected air conditioning system utilizing shallow geothermal energy

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