CN210292429U - Air source and underground frozen earth source heat pump system in severe cold area - Google Patents
Air source and underground frozen earth source heat pump system in severe cold area Download PDFInfo
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- CN210292429U CN210292429U CN201920709675.1U CN201920709675U CN210292429U CN 210292429 U CN210292429 U CN 210292429U CN 201920709675 U CN201920709675 U CN 201920709675U CN 210292429 U CN210292429 U CN 210292429U
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Abstract
The utility model discloses an air source and underground frozen earth source heat pump system in severe cold areas, which comprises a salt tower heat pump, a salt tower, an underground heat exchange system, a plate heat exchanger and a brine tank; the salt tower heat pump comprises an evaporator and a condenser; an evaporator of the salt tower heat pump is connected with the salt tower through a circulating pipeline, an underground heat exchange system is connected between the salt tower heat pump evaporator and the salt tower, the underground heat exchange system is connected with a plate heat exchanger, and the salt tower heat pump, the underground heat exchange system, the salt tower and the plate heat exchanger are switched through a one-way valve to form a double-heat-source heat pump system; the water inlet side of the brine tank is connected with the salt tower; the liquid level high point of the salt tower is connected with the brine tank. The utility model discloses simple structure, the energy consumption is low, and occupation space is little, and the initial investment is low, and the working costs is low, environmental protection and energy saving also can use in severe cold area, and adaptability is more extensive, need not extract groundwater, saves the water resource.
Description
Technical Field
The utility model relates to a heating refrigerating system suitable for severe cold area.
Background
In recent years, with the deep implementation of national energy conservation and emission reduction policies, clean energy technologies such as air source heat pumps and ground source heat pumps are rapidly developed. The newly released comprehensive working scheme of energy conservation and emission reduction of thirteen five is definitely proposed to aim at improving the energy utilization rate and the ecological environment.
The cold and heat sources for heating and refrigerating in severe cold regions are generally as follows: the air source heat pump takes air as a cold and heat source, is convenient to install and use, can fully utilize energy in the air, and is high-efficiency and energy-saving air conditioning equipment; however, the air source heat pump is easy to frost when the outdoor temperature is low, even the air source heat pump cannot operate, in a severe cold area, in order to deal with the outdoor low temperature, a cascade heat pump unit is mostly adopted, or a technical means with an economizer is used for ensuring the normal use of the equipment, but when the outdoor temperature is low, the heating efficiency is greatly attenuated, and when the outdoor environment temperature is lower than-10 ℃, the primary energy utilization efficiency of the air source heat pump is lower than that of a coal-fired boiler; meanwhile, in order to cope with extremely low temperature, the unit selection is too large, which brings great economic investment and no energy conservation in operation.
The ground source heat pump system is a mode of punching holes in soil and burying heat exchange buried pipes, utilizes low-temperature water in the buried pipes to extract geothermal energy stored in a shallow layer of the ground surface, and has the advantages of high efficiency, energy conservation and low operating cost. Considering that the width of the country is large, the difference of the cold and heat loads of different areas is large, the soil is unbalanced in heat absorption and discharge easily caused by long-term use in severe cold areas, and the use effect and high efficiency and energy conservation can not be ensured. Meanwhile, the ground source heat pump needs a larger space for arranging buried holes due to a large number of holes. The system is limited in practical use.
The use of water source heat pumps has certain influence on underground water resources, and the use is limited at present due to national policies of protecting underground water resources and environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above-mentioned problem that exists among the prior art, provide an air source and underground frozen soil source heat pump system in severe cold area, this system compares with air source heat pump system commonly used, simple structure, and the energy consumption is low, compares with ground source heat pump commonly used, and occupation space is little, and the initial investment is low, and the working costs is low, environmental protection and energy saving also can use in severe cold area, and adaptability is more extensive, need not extract groundwater, saves the water resource.
In order to achieve the above purpose, the technical scheme of the utility model is that: an air source and underground frozen soil source heat pump system in a severe cold region comprises a salt tower heat pump, a salt tower, an underground heat exchange system, a plate heat exchanger and a brine tank; the salt tower heat pump comprises an evaporator and a condenser; after passing through a one-way valve I by a pipeline, one path of a brine inlet of the salt tower is connected with a brine outlet of an evaporator of a heat pump of the salt tower, the other path of the brine inlet of the salt tower is connected with a brine outlet of a brine tank by a liquid circulating pump I, the third path of the brine inlet of the salt tower is connected with a brine outlet of the salt tower by a one-way valve II after passing through a one-way valve a, the other path of the brine inlet of the salt tower is connected with a brine inlet of an underground heat exchange system after passing through a one-way valve III after passing through a liquid circulating pump II, the other path of the brine inlet of the evaporator of the heat pump of the; the brine outlet of the underground heat exchange system is also connected with a primary brine inlet of the plate heat exchanger, and the brine inlet is also connected with a primary brine outlet of the plate heat exchanger through a liquid circulating pump III; one path of the tail end water supply is connected with a water outlet of a condenser of the salt tower heat pump through a one-way valve V, and the other path of the tail end water supply is connected with a secondary water outlet of the plate heat exchanger through a one-way valve VI; the tail end backwater passes through a liquid circulating pump V, and then one path of the backwater is connected with a water inlet of a condenser of the salt tower heat pump through a one-way valve VII, and the other path of the backwater is connected with a secondary water inlet of the plate heat exchanger through a one-way valve VIII; a saline density on-line monitor is arranged on a connecting pipeline between a saline inlet of the salt tower heat pump and a saline outlet of the salt tower, and the saline density on-line monitor is connected with the flow of the liquid circulating pump I in a control mode; the distance between every two adjacent buried pipes of the underground heat exchange system is 2-3 meters.
Further preferably, backfill soil is added into a gap between the buried pipe of the underground heat exchange system and soil, and water is added into the backfill soil. The water content of the soil is increased to ensure more sufficient frozen soil solidification heat.
Further preferably, the spacing between adjacent buried pipes of the underground heat exchange system is optimally 2-2.5 m.
Further preferably, the liquid level high point of the salt tower is connected with a brine return opening of the brine tank through an overflow pipe;
further preferably, the salt tower is an air energy tower using brine as a working medium.
Further preferably, the check valves a and b are electrically controlled valves, and temperature sensors are arranged on pipelines at the check valves a and b and are respectively interlocked with the check valves a and b. So that the one-way valves a and b can be automatically switched on and off according to the outdoor temperature change.
The utility model discloses a carry out the analysis to severe cold area certain regional annual meteorological parameter, count out the temperature critical point that the system operation switched, temperature critical point is-10-, -15 ℃ usually, carries out the system switching when outdoor ambient temperature is higher than the setting value and is less than the setting value.
When the outdoor temperature is higher than a set value of-10 to-15 ℃, the one-way valves a, III, IV, VI and VIII are closed, the one-way valves b, I, II, VII and V are opened, the circulation is carried out between the evaporator side of the salt tower heat pump and the salt tower, the evaporator side evaporates to absorb heat, the condenser side of the salt tower heat pump condenses to release heat, and hot water is produced for users to use. When the outdoor air temperature is lower than a set value of-10 to-15 ℃, the one-way valves b, I, II, VII and V are closed, the one-way valves a, III, IV, VI and VIII are opened, circulation is carried out between the evaporator side of the salt tower heat pump and the underground heat exchange system, the evaporator side evaporates to absorb heat, the condenser side of the salt tower heat pump condenses to release heat, and hot water is produced for users to use. In summer air-conditioning season, the soil sensible heat and the frozen soil solidification heat stored in the underground heat exchange system in winter are preferentially used as a natural cold source system to supply cold for a terminal user through heat exchange with the plate heat exchanger; when the sensible heat of the soil and the frozen soil solidification heat are used up, the one-way valves a, III, IV, VI and VIII are closed, the one-way valves b, I, II, VII and V are opened, the salt tower heat pump is used as a cold source, and the salt tower is used as a high-efficiency cooling tower to supply cold for a terminal user.
The utility model discloses a circulating liquid that underground heat transfer system buries intraductal is the salt solution, the freezing point of salt solution is low, winter still can circulate below 0 ℃, as long as keep getting into underground heat transfer system's salt solution and be less than the temperature of soil around, just can continue to absorb the temperature in the soil, can both absorb the sensible heat of soil, can absorb again in the soil because the water in the soil becomes ice and make soil become the frozen soil and the solidification heat that releases, so can make the interval between each adjacent pipe that buries diminish, the heat exchange efficiency of underground heat transfer system and unit area's heat transfer volume have been increased, under the condition of the same heat transfer volume, can greatly reduced the shared space volume of underground heat transfer system, make the higher project of volumetric efficiency also can realize, adaptability is more extensive, and underground heat transfer system relative volume diminishes, so the initial investment step-down.
Compared with the prior art, the utility model discloses outdoor underground heat transfer system occupation space is little, and adaptability is more extensive, and the initial investment is low. The system does not need to pump underground water, thereby saving precious water resources. When the system is operated, the salt tower is used, high-grade air energy, soil sensible heat and solidification heat are used as heat sources, the heating coefficient of the double-source heat pump unit is kept above 2.5, and the system is always in a high-efficiency operation state. In summer, the underground heat exchange system supplies cold by using a free natural cold source, so that the cost and the energy consumption can be greatly reduced. Because the underground heat exchange system can absorb sensible heat and solidification heat of soil, the drilling quantity and the hole spacing of the underground heat exchange system are smaller than those of a ground source heat pump system, and the occupied area of buried holes is about 20% -25% of that of the ground source heat pump. The utility model discloses also can use in severe cold area, environmental protection and energy saving, the working costs is low.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the present embodiment includes a salt tower heat pump 1, a salt tower 2, an underground heat exchange system 3, a plate heat exchanger 4, and a brine tank 18. The salt tower heat pump 1 comprises an evaporator 21 and a condenser 20. The brine inlet of the salt tower 2 is connected with the brine outlet of the evaporator 21 of the salt tower heat pump 1 through one way after passing through a one-way valve I17 by a pipeline, the brine outlet of the salt tank 18 is connected with the brine inlet of the salt tower heat pump 1 through the other way after passing through a one-way valve a 9, the brine outlet of the salt tower 2 is connected with the third way after passing through a one-way valve II 22, the brine inlet of the underground heat exchange system 3 is connected with the other way after passing through a one-way valve III 11 through the liquid circulation pump II 6, the brine inlet of the evaporator 21 of the salt tower heat pump 1 is connected with the other way after passing through a one-way valve b 10, and the brine outlet of the underground heat exchange system 3 is connected. The brine outlet of the underground heat exchange system 3 is also connected with the primary brine inlet of the plate heat exchanger 4, and the brine inlet is also connected with the primary brine outlet of the plate heat exchanger 4 through a liquid circulating pump III 7. One path of the tail end water supply is connected with a water outlet of a condenser 20 of the salt tower heat pump 1 through a one-way valve V14, and the other path of the tail end water supply is connected with a secondary water outlet of the plate type heat exchanger 4 through a one-way valve VI 15. The tail end backwater passes through a liquid circulating pump V8, and then one path of backwater is connected with a water inlet of a condenser 20 of the salt tower heat pump 1 through a one-way valve VII 13, and the other path of backwater is connected with a secondary water inlet of the plate heat exchanger 4 through a one-way valve VIII 16. And a connecting pipeline between a brine inlet of the salt tower heat pump 1 and a brine outlet of the salt tower 2 is provided with a brine density on-line monitor 19, and the brine density on-line monitor 19 is controlled to be connected with the flow of the liquid circulating pump I5. The distance between every two adjacent buried pipes of the underground heat exchange system 3 is 2-3 meters. Preferably, backfill soil is added into a gap between the buried pipe of the underground heat exchange system 3 and soil, and water is added into the backfill soil. Preferably, the distance between every two adjacent buried pipes of the underground heat exchange system 3 is 2-2.5 m optimally. Preferably, the high point of the liquid level of the salt tower 2 is connected with the brine return opening of the brine tank 18 through an overflow pipe. Preferably, the salt tower 2 is an air energy tower with brine as a working medium. Preferably, the one-way valves a 9 and b 10 are electrically controlled valves, and the pipelines at the positions of the one-way valves a 9 and b 10 are respectively provided with a temperature sensor which is interlocked with the one-way valve a 9 and the one-way valve b 10 respectively, so that the one-way valves a and b can be automatically switched on and off according to outdoor temperature changes.
The above embodiments are preferred and illustrative only, and equivalent technical modifications may be made by those skilled in the art based on the description of the patent, which are within the scope of the patent.
Claims (10)
1. An air source and underground frozen soil source heat pump system in a severe cold area is characterized by comprising a salt tower heat pump, a salt tower, an underground heat exchange system, a plate heat exchanger and a salt water tank; the salt tower heat pump comprises an evaporator and a condenser; after passing through a one-way valve I by a pipeline, one path of a brine inlet of the salt tower is connected with a brine outlet of an evaporator of a heat pump of the salt tower, the other path of the brine inlet of the salt tower is connected with a brine outlet of a brine tank by a liquid circulating pump I, the third path of the brine inlet of the salt tower is connected with a brine outlet of the salt tower by a one-way valve II after passing through a one-way valve a, the other path of the brine inlet of the salt tower is connected with a brine inlet of an underground heat exchange system after passing through a one-way valve III after passing through a liquid circulating pump II, the other path of the brine inlet of the evaporator of the heat pump of the; the brine outlet of the underground heat exchange system is also connected with a primary brine inlet of the plate heat exchanger, and the brine inlet is also connected with a primary brine outlet of the plate heat exchanger through a liquid circulating pump III; one path of the tail end water supply is connected with a water outlet of a condenser of the salt tower heat pump through a one-way valve V, and the other path of the tail end water supply is connected with a secondary water outlet of the plate heat exchanger through a one-way valve VI; the tail end backwater passes through a liquid circulating pump V, and then one path of the backwater is connected with a water inlet of a condenser of the salt tower heat pump through a one-way valve VII, and the other path of the backwater is connected with a secondary water inlet of the plate heat exchanger through a one-way valve VIII; a saline density on-line monitor is arranged on a connecting pipeline between a saline inlet of the salt tower heat pump and a saline outlet of the salt tower, and the saline density on-line monitor is connected with the flow of the liquid circulating pump I in a control mode; the distance between every two adjacent buried pipes of the underground heat exchange system is 2-3 meters.
2. The air source and underground frozen soil source heat pump system in severe cold regions as claimed in claim 1, wherein backfill soil is added into a gap between the buried pipe of the underground heat exchange system and soil, and water is added into the backfill soil.
3. The severe cold region air source and underground frozen soil source heat pump system according to claim 1 or 2, wherein the distance between the adjacent buried pipes of the underground heat exchange system is preferably 2-2.5 m.
4. The severe cold region air source and underground frozen soil source heat pump system according to claim 3, wherein the liquid level high point of the salt tower is connected with a brine return opening of a brine tank through an overflow pipe.
5. The severe cold region air source and underground frozen soil source heat pump system according to claim 4, wherein the salt tower is an air energy tower using saline water as a working medium.
6. The air source and underground frozen soil source heat pump system in severe cold regions as claimed in claim 5, wherein the one-way valves a and b are electrically controlled valves, and the pipelines at the positions of the one-way valves a and b are provided with temperature sensors which are respectively interlocked with the one-way valve a and the one-way valve b.
7. The severe cold region air source and underground frozen soil source heat pump system according to claim 1 or 2, wherein the liquid level high point of the salt tower is connected with a brine return opening of a brine tank through an overflow pipe.
8. The severe cold region air source and underground frozen soil source heat pump system according to claim 7, wherein the salt tower is an air energy tower using saline water as working medium.
9. The air source and underground frozen soil source heat pump system in severe cold regions as claimed in claim 8, wherein the one-way valves a and b are electrically controlled valves, and the pipelines at the positions of the one-way valves a and b are respectively provided with temperature sensors which are respectively interlocked with the one-way valve a and the one-way valve b.
10. The air source and underground frozen soil source heat pump system in severe cold regions as claimed in claim 3, wherein the salt tower is an air energy tower with salt water as working medium; the one-way valves a and b are electric control valves, temperature sensors are arranged on pipelines at the positions of the one-way valves a and b, and the temperature sensors are respectively interlocked with the one-way valves a and the one-way valves b.
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| CN201920709675.1U CN210292429U (en) | 2019-05-17 | 2019-05-17 | Air source and underground frozen earth source heat pump system in severe cold area |
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| CN201920709675.1U CN210292429U (en) | 2019-05-17 | 2019-05-17 | Air source and underground frozen earth source heat pump system in severe cold area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637651A (en) * | 2020-06-09 | 2020-09-08 | 奉政一 | Method and device for acquiring and releasing condensation heat of underground heat exchange tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637651A (en) * | 2020-06-09 | 2020-09-08 | 奉政一 | Method and device for acquiring and releasing condensation heat of underground heat exchange tube |
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