CN116806600A - Greenhouse heating and refrigerating system for storing solar energy by utilizing soil in cross-season mode - Google Patents
Greenhouse heating and refrigerating system for storing solar energy by utilizing soil in cross-season mode Download PDFInfo
- Publication number
- CN116806600A CN116806600A CN202310175563.3A CN202310175563A CN116806600A CN 116806600 A CN116806600 A CN 116806600A CN 202310175563 A CN202310175563 A CN 202310175563A CN 116806600 A CN116806600 A CN 116806600A
- Authority
- CN
- China
- Prior art keywords
- heat medium
- pipe
- heating
- heat
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/243—Collecting solar energy
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/246—Air-conditioning systems
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Greenhouses (AREA)
- Central Heating Systems (AREA)
Abstract
A greenhouse heating and cooling system for storing solar energy across seasons of soil, comprising: the system comprises a buried pipe, a heat pump host, an air heat exchanger, a heat medium circulation pipeline, a heat medium circulation pump, a power supply device and a heat medium filled in the system. The improvement is that: the solar energy heat pump system comprises a low-temperature heat medium conveying pipe, a heating heat medium reflux pipe, a control operation mode two-way valve and a power supply photovoltaic power supply, wherein the heating heat medium conveying bypass pipe is connected between the low-temperature heat medium conveying pipe and the heating heat medium conveying pipe, the heating heat medium reflux pipe is connected between the low-temperature heat medium reflux pipe and the heating heat medium reflux pipe, and the control operation mode two-way valve and the power supply photovoltaic power supply are respectively arranged on the low-temperature heat medium conveying pipe, the low-temperature heat medium reflux pipe, the heating heat medium conveying pipe, the heating heat medium reflux pipe, the heating heat medium conveying pipe, the heating heat medium reflux pipe and the heating heat medium conveying pipe. The invention has the positive effects that: the low-cost heat supply source is developed for the greenhouse in the cold area, the large problem of unbalanced ground temperature caused by overheating in the greenhouse and excessive heat taking of the soil source heat pump is solved, and the method has extremely important significance for the greenhouse industry in the cold area.
Description
Technical Field
The invention belongs to the field of heating, and particularly relates to a greenhouse heating and refrigerating device for storing solar energy by utilizing soil in a cross-season mode.
Background
The high heat supply cost is a core factor for restricting the development of greenhouse industry in cold areas. Taking a 15 ten thousand square meters greenhouse park in Jilin province as an example: the consumption of heating coal is about 1.4 ten thousand tons each year, and the converted heat is about 19.5 and Mo Jijiao. In spring, summer and autumn, the greenhouse is excessively heated due to solar radiation, and the indoor temperature can reach 50-60 ℃ which is far higher than the proper temperature for crop growth. Heat is transferred by means of ventilation, wet curtain cooling, sun shading and the like to maintain normal production. And (3) data display: the total annual solar radiation amount in the area is 4500-5100 megajoules/square meter, the total solar radiation heat amount in the spring, summer and autumn is about 3.1 Ji Jiao/square meter, the total solar radiation heat amount obtained by converting the solar radiation into the greenhouse is about 46.5 Mo Jijiao, and the total solar radiation heat amount is 2.38 times of the heat amount for heating in winter. If the heat can be directly stored in the underground deep soil which is completely covered by the greenhouse, solar energy is stored by utilizing the thermal inertia of the deep soil in a cross-season mode, and the soil source heat pump technology is reused in winter to heat the greenhouse. Firstly, the consumption of heating coal can be reduced by 1.4 ten thousand tons per year, and the emission of the reduced carbon is reduced by about 1.76 ten thousand tons per year. Secondly, the purpose of free temperature reduction in spring, summer and autumn can be realized by utilizing the constant temperature characteristic of the underground soil in the region at 7 ℃.
Disclosure of Invention
The invention aims to provide a greenhouse heating and refrigerating system for storing solar energy in soil across seasons, which utilizes thermal inertia of deep soil to store solar energy in the soil across seasons, is used for regulating and controlling the room temperature of a greenhouse which needs heating in winter and cooling in summer, replaces a winter heating mode of the greenhouse in the existing severe cold region, and reduces the consumption of non-renewable energy sources.
The greenhouse heating and refrigerating system using soil to store solar energy across seasons of the invention comprises: the heat pump system comprises a ground buried pipe for exchanging heat energy with soil, a heat pump host installed in a shielding space in or out of a greenhouse, an air heat exchanger installed in the greenhouse, a low-temperature heat medium circulation pipeline between the ground buried pipe and the heat pump host, a heating heat medium circulation pipeline between the heat pump host and the air heat exchanger, a heat medium circulation pump on the low-temperature heat medium circulation pipeline, a heat medium circulation pump on the heating heat medium circulation pipeline, a power supply device and a liquid heat medium filled in the ground buried pipe, the heat pump host, the air heat exchanger and the circulation pipeline.
The low temperature heat medium circulation pipeline comprises: the low-temperature heat medium return pipe is connected with the ground buried pipe outlet and the evaporation side inlet of the heat pump host. Wherein the heating medium circulation pipeline includes: the heat pump system comprises a heating heat medium conveying pipe connected with a condensing side outlet of the heat pump main machine and an air heat exchanger inlet, and a heating heat medium return pipe connected with the condensing side inlet of the heat pump main machine and the air heat exchanger outlet.
The valve is arranged on the low-temperature heat medium conveying pipe, the low-temperature heat medium return pipe, the heating heat medium conveying pipe, the heating heat medium return pipe, the heat medium conveying bypass pipe and the heating heat medium return bypass pipe respectively.
The air heat exchanger preferably uses a fan coil heat exchanger.
Among them, the liquid heating medium is preferably a coolant which is usually used for automobiles.
In order to save the commercial electricity consumption of the low-temperature heat medium circulating pump and the air heat exchanger which are operated for a long time in spring, summer and autumn in sufficient sunshine, the invention is further improved as follows: the photovoltaic power supply is composed of a photovoltaic panel, a storage battery matched with the photovoltaic panel, a controller and an inverter, and a low-temperature heat medium circulating pump and an air heat exchanger.
The invention has the positive effects that:
1. the characteristic that the soil temperature in the area is constant at 7-10 ℃ is fully utilized, the ground source heat is converted into a greenhouse heating heat source in winter, the air heat accumulation in the greenhouse, which is higher than the crop growing environment, is transferred to the ground in spring, summer and autumn, a low-cost heating heat source is developed for the greenhouse in the cold area, the problem of overheating in the greenhouse is solved, and the large problem of ground temperature unbalance caused by excessive heat taking of the soil source heat pump in winter in the severe cold area is also solved.
2. The buried pipe is buried in deep soil which is completely covered by the greenhouse, so that the influence of the frozen soil layer on the underground soil temperature field is thoroughly solved. The buried pipe depth of the ground source heat pump in the region is required to be below 1.8 meters of the frozen soil layer. When the temperature of the soil at the bottom of the frozen soil layer is gradually lower than 0 ℃, the temperature of the deep soil is kept at 7-10 ℃, and the liquid heating medium in the buried pipe is vertically 100-150 m, and the liquid heating medium in a static state can form a circulation from bottom to top in the pipe through the density difference due to the gradual expansion of the upper temperature difference and the lower temperature difference, so that a vertical upward heat conduction path is formed. After the invention is adopted, the temperature of the cultivation layer is always higher than the soil temperature of the buried pipe because the temperature of the cultivation layer in the greenhouse is basically constant at about 15 ℃ in four seasons, thereby solving the big problem of heat dissipation of the frozen soil layer.
3. The solar energy collection device is matched with the photovoltaic power supply, so that the solar energy collection cost is reduced. A large amount of electrical energy is consumed to collect this portion of solar energy. Firstly, the air heat exchanger consumes a part of fan electric energy. Secondly, the energy consumption of the low-temperature heat medium circulating pump is measured and calculated according to 15 ten thousand square meters, the circulating capacity is 6000 tons/h, the power consumption of the water pump is about 600KW/h, and the daily energy consumption is 6000kwh measured and calculated according to 10 hours of daily operation. And the solar energy collection cost is greatly reduced by directly utilizing the photovoltaic power supply for driving.
4. The invention explores a new path for the agricultural greenhouse industry in severe cold areas. Taking Jilin province as an example: the agricultural province with the advantage of black land resources has the biggest problem that the greenhouse industry is not as good as Shandong god in county, and the heating operation cost in winter is too high.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a greenhouse refrigeration system (a mode of cooling a greenhouse to store solar heat underground) using soil to store solar energy across seasons in the invention.
Fig. 2 is a schematic diagram of the overall structure of a greenhouse heating system using soil to store solar energy across seasons (a mode of heating a greenhouse by extracting stored solar heat) according to the present invention.
Detailed Description
Referring to fig. 1 and 2, the solar greenhouse heating and temperature control system using soil source heat of the present invention includes: the system comprises a ground buried pipe 1 for exchanging heat energy with soil, a heat pump host 2 arranged in a greenhouse, a fan coil heat exchanger 9 arranged in the greenhouse, a low-temperature heat medium conveying pipe 17 connected with an outlet of the ground buried pipe and an inlet of an evaporation side of the heat pump host, a low-temperature heat medium return pipe 3 connected with an inlet of the ground buried pipe and an outlet of the evaporation side of the heat pump host, a heating heat medium conveying pipe 16 connected with an outlet of a condensation side of the heat pump host and an inlet of the fan coil heat exchanger, a heating heat medium return pipe 5 connected with an inlet of the heat pump host and an outlet of the fan coil heat exchanger, a low-temperature heat medium circulating pump 7-2 arranged on the low-temperature heat medium conveying pipe, a heating heat medium circulating pump 7-1 arranged on the heating heat medium return pipe, a heat medium conveying pipe 17 and a heating heat medium conveying pipe 16, a heat medium return pipe 6 connected with the low-temperature heat medium return pipe 3 and the heating heat medium return pipe 5, a valve 4-6 arranged on the low-temperature heat medium conveying pipe, a valve 4-4 arranged on the heating heat medium conveying pipe, a valve 4-5 arranged on the heating heat medium conveying bypass pipe, a valve 4-5 arranged on the heating medium return pipe, a valve 4-by-pass pipe, and a liquid medium return pipe 4 arranged on the heating system.
The photovoltaic panel 8 is installed on the outer ceiling of the greenhouse, the distribution box is arranged in the greenhouse, the storage battery 14, the controller 10 and the inverter 11 are installed in the distribution box, and the power lines of the fan motor, the circulating pump and the soil source heat pump are led out from the inverter 11. And then the double power supply switching box 12 and the electric control box 13 are used for controlling the switching power consumption of commercial power supply.
The operation modes of this embodiment are:
and cooling the greenhouse to store solar heat mode underground: referring to fig. 1, the heat pump main unit 2 and the circulation pump 7-1 are turned off, the two-way valves 4-1, 4-3, 4-4, 4-6 are turned off, the two-way valves 4-2 and 4-5 are turned on, and the heat medium delivery bypass pipe and the heat medium delivery return pipe path between the buried pipe 1 and the fan coil heat exchanger 9 are opened. The sunlight irradiates the photovoltaic panel 8, the photovoltaic panel 8 generates electricity and drives the circulating pump 7-2 and the fan coil heat exchanger 9, circulating power of liquid heat medium is formed between the fan coil heat exchanger 9 and the ground buried pipe 1, the liquid heat medium is pushed to flow out from the outlet of the ground buried pipe 1, the liquid heat medium flows out from the outlet of the ground buried pipe 1 again through the low-temperature heat medium conveying pipe 17, the two-way valve 4-5 and the heat medium conveying bypass pipe 15, the overheated air in the greenhouse exchanges heat with the fan coil heat exchanger 9, the temperature of the liquid heat medium is reduced, the liquid heat medium after heating is heated, the heated liquid heat medium enters the inlet of the ground buried pipe 1 along the fan coil heat exchanger 9, the heat medium conveying return pipe 6, the two-way valve 4-2 and the heat medium return pipe 3, the heat is radiated to the periphery of the underground soil, the temperature of the underground soil is caused to be increased, the liquid heat medium is cooled, the cooled liquid heat medium flows out from the outlet of the ground buried pipe 1 again, the circulation is repeated, and the whole process of cooling the underground soil is completed once.
And (3) extracting stored solar heat to supply heat to a greenhouse: referring to fig. 2, the two-way valves 4-2 and 4-5 are closed, and the heat medium transfer bypass pipe and the heat medium transfer return pipe paths between the buried pipe 1 and the fan coil heat exchanger 9 are closed. And opening the two-way valves 4-1, 4-3, 4-4 and 4-6, switching to a commercial power supply, and driving the low-temperature heat medium circulating pump 7-2, the heating heat medium circulating pump 7-1, the heat pump host 2 and the fan coil radiator 9. Under the action of the low-temperature heat medium circulating pump 7-2, circulating power of liquid heat medium is formed between the evaporation side of the heat pump host 2 and the buried pipe 1, the liquid heat medium is pushed to enter the buried pipe 1 to absorb underground soil heat, the liquid heat medium after absorbing heat flows out from the outlet of the buried pipe 1, enters the evaporation side of the heat pump host 2 through the low-temperature heat medium conveying pipe 17 and the two-way valve 4-6, the heat pump host 2 absorbs part of heat and transfers the heat to the inside to perform work, so that the temperature of the liquid heat medium is reduced, and the cooled liquid heat medium enters the underground soil to absorb heat again along the low-temperature heat medium return pipe 3 and the two-way valve 4-1 and enters the inlet of the buried pipe 1. At the same time, the heat is absorbed at the condensing side of the heat pump host, the heat is processed by the compressor of the heat pump host 2 to form a heating liquid heat medium, the circulating power of the liquid heat medium is formed between the condensing side of the heat pump host 2 and the fan coil radiator 9 under the driving of the heating heat medium circulating pump 7-1, the heating liquid heat medium enters the inlet of the fan coil radiator 9 along the heating heat medium conveying pipe 16 and through the two-way valve 4-4, after the heat exchange between the inside of the fan coil radiator 9 and the indoor air, the temperature of the liquid heat medium is reduced, the temperature of the air in the greenhouse is increased, the cooled liquid heat medium enters the condensing side of the heat pump host 2 again along the heating heat medium return pipe 5 through the two-way valve 4-3 and the heating heat medium circulating pump 7-1, and the circulation is repeated, so that the whole process of extracting and storing solar heat for heating the greenhouse for one time is completed.
In the season that the illumination makes the temperature of greenhouse and crop growth compatible, close circulating pump, close the heat pump host computer, close fan coil radiator, the system is in the outage mode.
Claims (2)
1. A greenhouse heating and cooling system for storing solar energy across seasons of soil, comprising: the heat pump system comprises a ground buried pipe for exchanging heat energy with soil, a heat pump host installed in a shielding space in or out of a greenhouse, an air heat exchanger installed in the greenhouse, a low-temperature heat medium circulation pipeline between the ground buried pipe and the heat pump host, a heating heat medium circulation pipeline between the heat pump host and the air heat exchanger, a heat medium circulation pump on the low-temperature heat medium circulation pipeline, a heat medium circulation pump on the heating heat medium circulation pipeline, a power supply device and a liquid heat medium filled in the ground buried pipe, the heat pump host, the air heat exchanger and the circulation pipeline,
the low temperature heat medium circulation pipeline comprises: a low-temperature heat medium conveying pipe connected with the outlet of the buried pipe and the evaporation side inlet of the heat pump host, a low-temperature heat medium return pipe connected with the inlet of the buried pipe and the evaporation side outlet of the heat pump host,
wherein the heating medium circulation pipeline includes: a heating heat medium conveying pipe connected with the outlet of the condensing side of the heat pump host and the inlet of the air heat exchanger, a heating heat medium return pipe connected with the inlet of the condensing side of the heat pump host and the outlet of the air heat exchanger,
the method is characterized in that: a heating medium conveying bypass pipe is connected between a low-temperature heating medium conveying pipe and a heating medium conveying pipe, a heating medium backflow bypass pipe is connected between a low-temperature heating medium backflow pipe and a heating medium backflow pipe, and valves for controlling operation modes are respectively arranged on the low-temperature heating medium conveying pipe, the low-temperature heating medium backflow pipe, the heating medium conveying pipe, the heating medium backflow pipe, the heating medium conveying bypass pipe and the heating medium backflow bypass pipe.
2. A greenhouse heating and cooling system for storing solar energy across seasons in soil according to claim 1, wherein: the photovoltaic power supply is composed of a photovoltaic panel, a storage battery matched with the photovoltaic panel, a controller and an inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310175563.3A CN116806600A (en) | 2023-02-28 | 2023-02-28 | Greenhouse heating and refrigerating system for storing solar energy by utilizing soil in cross-season mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310175563.3A CN116806600A (en) | 2023-02-28 | 2023-02-28 | Greenhouse heating and refrigerating system for storing solar energy by utilizing soil in cross-season mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116806600A true CN116806600A (en) | 2023-09-29 |
Family
ID=88139989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310175563.3A Pending CN116806600A (en) | 2023-02-28 | 2023-02-28 | Greenhouse heating and refrigerating system for storing solar energy by utilizing soil in cross-season mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116806600A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119817369A (en) * | 2025-03-12 | 2025-04-15 | 河北工程大学 | Solar geothermal energy storage radiation heating and cooling system for greenhouse |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202253940U (en) * | 2011-09-23 | 2012-05-30 | 扬州大学 | A solar-earth source heat pump composite energy system for cold regions |
| CN103190313A (en) * | 2013-04-19 | 2013-07-10 | 哈尔滨工业大学 | Air energy soil-thermal storage heating and cooling device for fruit and vegetable plastic sheds or greenhouses in cold areas |
| CN203554974U (en) * | 2013-11-28 | 2014-04-23 | 哈尔滨阳光能源工程有限公司 | Solar underground heat-storage sunlight greenhouse heating system |
| CN205316456U (en) * | 2015-12-04 | 2016-06-15 | 北京华业阳光新能源有限公司 | Solar energy ground -source heat pump coupling air conditioner heating system based on cross -season heat accumulation |
| CN209185225U (en) * | 2018-10-19 | 2019-08-02 | 合肥加杭蓄热科技有限公司 | A kind of cleaning heating system for northern greenhouse |
-
2023
- 2023-02-28 CN CN202310175563.3A patent/CN116806600A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202253940U (en) * | 2011-09-23 | 2012-05-30 | 扬州大学 | A solar-earth source heat pump composite energy system for cold regions |
| CN103190313A (en) * | 2013-04-19 | 2013-07-10 | 哈尔滨工业大学 | Air energy soil-thermal storage heating and cooling device for fruit and vegetable plastic sheds or greenhouses in cold areas |
| CN203554974U (en) * | 2013-11-28 | 2014-04-23 | 哈尔滨阳光能源工程有限公司 | Solar underground heat-storage sunlight greenhouse heating system |
| CN205316456U (en) * | 2015-12-04 | 2016-06-15 | 北京华业阳光新能源有限公司 | Solar energy ground -source heat pump coupling air conditioner heating system based on cross -season heat accumulation |
| CN209185225U (en) * | 2018-10-19 | 2019-08-02 | 合肥加杭蓄热科技有限公司 | A kind of cleaning heating system for northern greenhouse |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119817369A (en) * | 2025-03-12 | 2025-04-15 | 河北工程大学 | Solar geothermal energy storage radiation heating and cooling system for greenhouse |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104633980B (en) | Solar energy ground can complementary wind energy heat pump system | |
| CN102679624B (en) | Solar energy and heat source tower heat pump combined triple supply air-conditioning system | |
| CN103190313B (en) | Air energy soil-thermal storage heating and cooling device for fruit and vegetable plastic sheds or greenhouses in cold areas | |
| CN101832682B (en) | Energy-storing solar absorption refrigeration system | |
| CN108029403A (en) | Temp auto-controlled solar energy greenhouse system based on phase-change heat storage technology | |
| CN103307803B (en) | Cold and hot water supply device by compositely utilizing energy | |
| CN102589195A (en) | Heat supply and refrigeration system combining spatial energy with ground source energy | |
| Chen et al. | Comparative study on a solar-assisted ground source heat pump with CPC solar collector and phase change heat storage | |
| CN102494441A (en) | Heating air-conditioning system for solar adsorption heat pump | |
| KR20180126941A (en) | Control system for a solar assisted heat pump system with hybrid solar collectors | |
| CN208029661U (en) | Temp auto-controlled solar energy greenhouse system based on phase-change heat storage technology | |
| CN209960601U (en) | A solar energy and ground source heat pump integrated heating system | |
| CN103644591B (en) | A kind of composite heat supply air conditioning system adopting solar heat-preservation pond and heat pump | |
| CN116806600A (en) | Greenhouse heating and refrigerating system for storing solar energy by utilizing soil in cross-season mode | |
| CN103836835A (en) | Solar heat pump cogeneration system | |
| CN116025199A (en) | An active and passive coupling heating solar room with additional sunlight room | |
| CN211854164U (en) | Novel ground source heat pump coupling solar heating system | |
| CN206001586U (en) | A kind of Differential Control solar energy heat distribution system | |
| CN202813884U (en) | Solar energy ground source heat combined zero-carbon-emission heating and refrigeration system | |
| CN219034188U (en) | Active and passive coupling heating solar house between additional sunshine | |
| CN219063631U (en) | Cold radiation continuous temperature regulating system | |
| CN201491453U (en) | LED display screen temperature control system | |
| CN202432749U (en) | Solar energy absorbing type heat pump heating and air-conditioning system | |
| CN203489506U (en) | Automatic control system for solar composite ground source heat pump | |
| CN109386978A (en) | Energy tower-soil thermal storage coupling buried pipe ground-source heat pump system and its application in soil thermal storage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |