Earth energy heat exchange and air conditioner comprehensive utilization system

Abstract

The utility model discloses a ground energy heat exchange and air conditioner comprehensive utilization system which comprises an air cooling air conditioner external unit, an air cooling air conditioner internal unit, a circulating fan and a plurality of buried pipe heat exchangers, and the buried pipe heat exchangers are connected in series to form a buried heat exchange module. The air-cooled air conditioner outdoor unit is provided with an air-cooled air conditioner outdoor unit air inlet and an air-cooled air conditioner outdoor unit air outlet, an air outlet of the buried heat exchange module is connected with an air inlet of the circulating fan through an air supply pipeline, and an air outlet of the circulating fan is connected with the air inlet of the air-cooled air conditioner outdoor unit through an air inlet pipeline. An air outlet of the air-cooled air conditioner outdoor unit is connected with an air inlet of the buried heat exchange module through an air return pipeline; the air supply pipeline is connected with an air supply pipeline, an air supply opening is formed in the air supply pipeline, and an air supply valve is arranged at the air supply opening. The system solves the problems that an outdoor unit cannot be arranged indoors and is prone to frosting, the refrigerating (heating) effect of an air conditioner can be improved, meanwhile, considerable electric energy can be saved, and the refrigerating (heating) requirement of people is met through clean energy.

Description

Technical Field

[0001] The utility model relates to the technical field of building energy-saving design, and in particular to a geothermal heat exchange and air conditioning comprehensive utilization system. Background Art

[0002] Building energy consumption in my country accounts for more than 25% of the total energy consumption of the whole society, and half of the building energy consumption comes from heating, ventilation, air conditioning and related systems. Therefore, the energy consumption of air conditioning has become a hot issue in the current field of building energy conservation. Almost all buildings today use air conditioning systems for air conditioning and ventilation and refrigeration, and their high energy consumption has become a major source of building energy consumption. In addition, while the air conditioning fresh air system creates a good indoor environment, it also brings certain damage to the external environment. How to use renewable energy to reduce indoor temperature has become a hot issue in fresh air.

[0003] According to the underground temperature changes, the earth's crust is often divided into the following four geothermal zones: (1) Diurnal temperature change zone: The temperature in this zone is affected by the daily temperature, and its variation depth range is generally no more than 1m; (2) Annual temperature change zone: The temperature in this zone is affected by seasonal temperature changes, and its depth range is generally no more than 20m; (3) Constant temperature zone: At a depth below 20m, it is not affected by seasonal temperature changes; (4) Geothermal warming zone: Below the constant temperature zone, due to the influence of the earth's internal heat, the stratum temperature increases with the increase of burial depth. From the distribution of geothermal zones, in summer, the soil around the buried pipes pre-buried to a certain depth can be used as a cold source to cool the fresh air, and in winter, the soil around the buried pipes pre-buried to a certain depth can be used as a heat source to preheat the fresh air, which can reduce the energy consumption of air conditioning.

[0004] The patent document of our company with publication number CN219797388U discloses an energy-saving prefabricated building system, including a geothermal collector and a geothermal distribution system. The geothermal collector is buried in the foundation of the basement and extends longitudinally into the deep soil. In this case, the geothermal collector is used to exchange energy between the air in the basement and the deep soil, and the geothermal distribution system is used to concentrate the air after the energy exchange and distribute it to the fresh air system of the above-ground building. In this way, the soil energy can be effectively used as a cold source to cool the fresh air in summer, and the soil energy can be effectively used as a heat source to preheat the fresh air in winter, thereby effectively reducing the energy consumption of using air conditioners. However, this solution does not consider how to realize the comprehensive utilization of geothermal energy and the outdoor unit of the air conditioner, and does not solve the problem that the outdoor unit of the air conditioner cannot be installed indoors and the outdoor unit is prone to frost in winter in the prior art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a geothermal heat exchange and air conditioning comprehensive utilization system with a more reasonable structural design, capable of realizing indoor installation of an air-conditioning outdoor unit and reducing the frosting problem of the air-conditioning outdoor unit.

[0006] To solve the above technical problems, the technical solution of the present utility model is as follows:

[0007] A comprehensive utilization system of ground energy heat exchange and air conditioning, including an air-cooled air conditioner outdoor unit and an air-cooled air conditioner indoor unit, further includes a circulation fan and a plurality of buried pipe heat exchangers buried in a ground foundation and extending longitudinally into deep soil. A connecting pipe for connecting the buried pipe heat exchangers in series is also buried in the ground foundation, and each series-connected buried pipe heat exchanger forms a ground heat exchange module;

[0008] The air-cooled air conditioner outdoor unit is provided with an air-cooled air conditioner outdoor unit air inlet and an air-cooled air conditioner outdoor unit air outlet. The air outlet of the ground heat exchange module is connected to the air inlet of the circulation fan through a supply air pipe, the air outlet of the circulation fan is connected to the air inlet of the air-cooled air conditioner outdoor unit through an intake air pipe, and the air outlet of the air-cooled air conditioner outdoor unit is connected to the air inlet of the ground heat exchange module through a return air pipe;

[0009] The supply air pipe is connected with a supplementary air pipe, an air supplement port is opened on the supplementary air pipe, and an air supplement valve is arranged at the air supplement port.

[0010] As a preferred technical solution, it further includes a fresh air unit. The fresh air unit is connected with an air collection chamber, and the air collection chamber is connected to the air outlet of the circulation fan through a supply air pipe; the return air pipe is connected with a fresh air pipe, a fresh air inlet is arranged on the fresh air pipe, a fresh air inlet control valve is arranged at the fresh air inlet, and a fresh air supply control valve is arranged on the supply air pipe; an air conditioner outdoor unit intake air control valve is arranged on the intake air pipe, and an air conditioner outdoor unit return air control valve is arranged on the return air pipe.

[0011] As a preferred technical solution, a defrost drain pipe is connected to the bottom of the air-cooled air conditioner outdoor unit, and a defrost drain valve is arranged on the defrost drain pipe.

[0012] As a preferred technical solution, the air-cooled air conditioner indoor unit is provided with a condensate discharge port, and the condensate discharge port is connected with a condensate discharge pipe.

[0013] As a preferred technical solution, the buried pipe heat exchanger includes a steel pipe pile. Heat conduction fins are arranged on the outer peripheral wall of the steel pipe pile. A partition is arranged in the inner cavity of the steel pipe pile. The partition divides the inner cavity of the steel pipe pile into an air inlet chamber and an air outlet chamber, and the bottoms of the air inlet chamber and the air outlet chamber are communicated with each other.

[0014] As a preferred technical solution, the heat conduction fins are designed in a sheet shape or a spiral shape.

[0015] As a preferred technical solution, the outer side of the connecting pipe is coated with a heat insulation layer.

[0016] Due to the adoption of the above technical solution, the present utility model has at least the following beneficial effects:

[0017] (1) This system links the air-conditioning system with the circulation fan to achieve the simultaneous opening and closing of the air-conditioning system and the ground energy system. After the energy in the air is exchanged with the energy in the soil, the preheated (cooled) air is sent to the air-cooled air-conditioning outdoor unit through the circulation fan for heat exchange with the refrigerant. The air after heat exchange with the air-cooled air-conditioning outdoor unit is sent back to the buried heat exchange module for circular heat exchange again. In this way, the heat discharged from the air-conditioning outdoor unit is transferred to the underground soil layer, avoiding the "heat island effect" and reducing the impact on the climate caused by using air conditioners.

[0018] (2) This system improves the refrigeration (heating) effect of the air conditioner. The air source heat pump can provide heat source for the floor heating, but its heating effect is poor in low temperature situations where the winter temperature is lower than -7°C. This system can provide comfortable heating conditions for places where the municipal supporting facilities are incomplete in cold regions. This system solves the problems that the outdoor unit cannot be installed indoors and the outdoor unit frosts. The outdoor unit box can be insulated or installed in a closed equipment room to avoid frosting of the outdoor unit in winter and affecting the heating effect. This system also solves the problem of short circuit of the air intake and exhaust of the outdoor unit, saving electric energy and reducing carbon emissions. Description of the Drawings

[0019] The following drawings are only intended to illustrate and explain the present utility model and do not limit the scope of the present utility model. Among them:

[0020] Figure 1 is the system schematic diagram of the first embodiment of the present utility model;

[0021] Figure 2 is the structural schematic diagram of the buried tube heat exchanger;

[0022] Figure 3 is the structural schematic diagram of the buried heat exchange module;

[0023] Figure 4 is the system schematic diagram of the second embodiment of the present utility model. Detailed Embodiment

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is understood that those of ordinary skill in the art can recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present utility model. Therefore, the drawings and the description are illustrative in nature and not intended to limit the scope of protection of the claims.

[0025] Embodiment 1

[0026] As Figure 1As shown in the figure, the comprehensive utilization system of ground energy heat exchange and air conditioning includes an air-cooled air conditioner outdoor unit 1 and an air-cooled air conditioner indoor unit 2, and also includes a circulation fan 3 and a plurality of buried pipe heat exchangers 4 buried in the underground foundation and extending longitudinally into the deep soil. A connecting pipe 11 for connecting the buried pipe heat exchangers 4 in series is also buried in the underground foundation. Each series-connected buried pipe heat exchanger 4 forms a ground heat exchange module;

[0027] The air-cooled air conditioner outdoor unit 1 is provided with an air-cooled air conditioner outdoor unit air inlet 101 and an air-cooled air conditioner outdoor unit air outlet 102. The air outlet of the ground heat exchange module is connected to the air inlet of the circulation fan 3 through an air supply pipe 5. The air outlet of the circulation fan 3 is connected to the air-cooled air conditioner outdoor unit air inlet 101 through an air inlet pipe 6. The air-cooled air conditioner outdoor unit air outlet 102 is connected to the air inlet of the ground heat exchange module through a return air pipe 7;

[0028] The air supply pipe 5 is connected with a gas supplement pipe 8. A gas supplement port is opened on the gas supplement pipe 8, and a gas supplement valve 9 is arranged at the gas supplement port.

[0029] Reference Figure 1 , a defrost drain pipe is connected to the bottom of the air-cooled air conditioner outdoor unit 1, and a defrost drain valve 103 is arranged on the defrost drain pipe. The defrost drain valve 103 can be linked to the defrost mode to drain water during winter defrosting. The air-cooled air conditioner indoor unit 2 is provided with a condensate discharge port, and the condensate discharge port is connected with a condensate discharge pipe 10.

[0030] Reference Figure 2 , the buried pipe heat exchanger 4 includes a steel pipe pile 401. A heat conduction fin 402 is arranged on the outer peripheral wall of the steel pipe pile 401. The heat conduction fin 402 is preferably designed in a spiral shape. The steel pipe pile 401 can effectively play a role in preventing the foundation from floating, and the spiral heat conduction fin 402 design can better improve the anti-floating ability of the pile raft foundation; a partition 403 is arranged in the inner cavity of the steel pipe pile 401. The partition 403 divides the inner cavity of the steel pipe pile into an air inlet chamber 404 and an air outlet chamber 405. The bottoms of the air inlet chamber 404 and the air outlet chamber 405 are connected and communicated to form a "U-shaped pipe-like". Reference Figure 3 , a plurality of steel pipe piles 401 are respectively connected through a connecting pipe 11 to form a plurality of series-connected loops with similar frictions. Air enters from one side of the partition 403, flows to the bottom connecting part of the steel pipe pile 401, and then flows out through the other side of the partition 403 and enters the next series-connected steel pipe pile 401. After passing through a plurality of steel pipe piles 401 in this way, the entire circulation path of the air flow is lengthened, the contact heat exchange time is increased, and the air flow exchanges heat with the deep soil. Connecting the plurality of series-connected loops in the same way to form a parallel loop can increase the air change rate.

[0031] The connecting pipe 11 is buried 1.5 meters underground. The connecting pipe 11 is laid after the foundation excavation of the building monomer is completed. An insulation and protection layer is made on the outside of the connecting pipe 11 and backfilled together with the foundation.

[0032] This system uses large-leaf spiral steel pipe piles as ground heat exchangers and constructs them together during the foundation construction. The system operation process is as follows: When operating for the first time, the air supply valve 9 is opened to supplement air for the ground energy system. The air supply time is set according to the capacity of the steel pipe piles and the air velocity in the pipes. After one air supply is completed, the air supply valve 9 is closed. The air exchanges heat through multiple groups of ground heat exchangers, exchanges energy with the soil, and then the preheated (cooled) air is sent to the air-cooled air conditioner outdoor unit 1 through the circulation fan 3 to exchange heat with the refrigerant. The air after exchanging heat with the air conditioner outdoor unit is sent back into the ground heat exchanger for circular heat exchange again. This system designs the air-cooled air conditioner outdoor unit 1 in a closed form. The air inlet 101 and the air outlet 102 of the air-cooled air conditioner outdoor unit are respectively connected to the inlet and outlet of the ground heat exchange module. When defrosting in winter, the defrosting drainage valve 103 can be opened in the linked defrosting mode for defrosting and drainage.

[0033] This system has a simple and durable structure, basically does not require maintenance, and its service life is basically the same as that of the building body. By linking the air conditioning system and the circulation fan, the air conditioning system and the ground energy system can be opened and closed simultaneously. After the air exchanges energy with the soil, the preheated (cooled) air is sent to the air-cooled air conditioner outdoor unit through the circulation fan to exchange heat with the refrigerant. The air after exchanging heat with the air-cooled air conditioner outdoor unit is sent back into the ground heat exchange module for circular heat exchange again. In this way, the heat discharged from the air conditioner outdoor unit is transferred to the underground soil layer, avoiding the "heat island effect" and reducing the impact on the climate caused by using air conditioners.

[0034] This system improves the air conditioning cooling (heating) effect. The air source heat pump can provide heat for the floor heating, but the heating effect is poor in low-temperature situations where the winter temperature is lower than -7°C. This system can provide comfortable heating conditions for places with incomplete municipal facilities in cold regions. This system solves the problems that the outdoor unit cannot be installed indoors and the outdoor unit frosts. The outdoor unit box can be insulated or installed in a closed equipment room to avoid the outdoor unit frosting in winter and affecting the heating effect. This system also solves the problem of short-circuit of the air intake and exhaust of the outdoor unit, saves electric energy, and reduces carbon emissions.

[0035] Embodiment 2

[0036] This embodiment adds a fresh air system on the basis of Embodiment 1, realizing the comprehensive application of the ground heat exchange system, the air-cooled air conditioner and the fresh air system. The same parts as in Embodiment 1 will not be described in detail. The difference is: Refer to Figure 4In this embodiment, a fresh air fan 12 is also included, and the fresh air fan 12 is connected to an air collecting chamber 13, and the air collecting chamber 13 is connected to the air outlet of the circulation fan 3 through an air supply duct 14; the return air duct 7 is connected to a fresh air duct 15, and a fresh air outlet is provided on the fresh air duct 15, and a fresh air inlet control valve 16 is provided at the fresh air outlet, and a fresh air supply control valve 17 is provided on the air supply duct 14; an air inlet control valve 18 of an air conditioner outdoor unit is provided on the air inlet duct 6, and a return air control valve 19 of an air conditioner outdoor unit is provided on the return air duct 7.

[0037] This system operates in two working conditions. The first working condition is to use geothermal energy to pre-cool (heat) fresh air in the transition season. The fresh air fan 12 is turned on, and the circulating air fan 3 is turned on in conjunction. The fresh air inlet control valve 16 and the fresh air supply control valve 17 are opened, and the air inlet control valve 18, the air return control valve 19 and the air supply valve 9 of the air conditioner outdoor unit are closed. The outdoor air enters the underground pipe heat exchange system through the fresh air inlet, and is pre-cooled (heated) and sent to the air collecting chamber 13 by the circulating air fan 3. Then, the air is purified and dehumidified by the fresh air fan 12 and sent to the room. This working condition can be used in early summer and late summer, early winter and late winter, that is, when the ambient temperature is not very high (low).

[0038] The second working condition: the air-cooled air conditioner outdoor unit 1 is turned on, the circulating fan 3 is turned on in conjunction, the air-conditioner outdoor unit air inlet control valve 18 and the air-conditioner outdoor unit return air control valve 19 are turned on, and the fresh air inlet control valve 16 and the fresh air supply control valve 17 are closed. When the system is running for the first time, the air supply valve 9 is opened to replenish air for the system, and the air supply time is set according to the capacity of the steel pipe pile and the wind speed in the pipe. After one air supply, the air supply valve is closed. The air in the geothermal system is heat-exchanged by multiple groups of underground pipe heat exchangers, so that the air exchanges heat with the soil, and then the preheated (cold) air is sent to the air-cooled air conditioner outdoor unit 1 through the circulating fan 3 for heat exchange with the refrigerant. The air after heat exchange is sent to the underground pipe heat exchange system again for circulation heat exchange.

[0039] The air-cooled air-conditioning outdoor unit 1 is designed to be closed, and the air inlet 101 and the air outlet 102 of the air-cooled air-conditioning outdoor unit are respectively connected to the air inlet and outlet of the underground heat exchange module. During defrosting in winter, the defrost mode can be linked to open the defrost drain valve 103 for defrosting and drainage. Since the air-conditioning outdoor unit of this system no longer exchanges heat with the atmosphere, the air-conditioning outdoor unit can be insulated or placed in a closed equipment room to avoid frost on the air conditioner in winter and affect heating.

[0040] In this embodiment, the open underground heat exchange system and the fresh air blower are combined in the first working condition, and the closed underground heat exchange system and the air source air conditioning system are combined in the second working condition. This system can increase the cooling and heating effect of the air conditioner while saving considerable electric energy, thus meeting people's cooling (heating) needs with clean energy.

[0041] The above are only the schematic specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Each valve preferably adopts an electric control valve. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present utility model shall fall within the scope of protection of the present utility model.

Claims

1. A geothermal heat exchange and air conditioning comprehensive utilization system, comprising an air-cooled air conditioning outdoor unit and an air-cooled air conditioning indoor unit, characterized in that: It also includes a circulating fan and a plurality of underground heat exchangers buried in the underground foundation and extending longitudinally into the deep soil. A connecting pipe is also buried in the underground foundation to connect the underground heat exchangers in series. The underground heat exchangers connected in series constitute an underground heat exchange module. The air-cooled air conditioner outdoor unit is provided with an air inlet and an air outlet of the air-cooled air conditioner outdoor unit, the air outlet of the underground heat exchange module is connected to the air inlet of the circulation fan through an air supply duct, the air outlet of the circulation fan is connected to the air inlet of the air-cooled air conditioner outdoor unit through an air inlet duct, and the air outlet of the air-cooled air conditioner outdoor unit is connected to the air inlet of the underground heat exchange module through a return air duct; The air supply duct is connected to an air supply duct, an air supply port is provided on the air supply duct, and an air supply valve is arranged at the air supply port.

2. The geothermal heat exchange and air conditioning comprehensive utilization system according to claim 1, characterized in that: It also includes a fresh air fan, which is connected to an air collecting chamber, and the air collecting chamber is connected to the air outlet of the circulation fan through an air supply duct; the return air duct is connected to a fresh air duct, and a fresh air outlet is provided on the fresh air duct, and a fresh air inlet control valve is provided at the fresh air outlet, and a fresh air supply control valve is provided on the air supply duct; an air inlet control valve of an air conditioner outdoor unit is provided on the air inlet duct, and a return air control valve of an air conditioner outdoor unit is provided on the return air duct.

3. The geothermal heat exchange and air conditioning comprehensive utilization system according to claim 1 or 2, characterized in that: A defrost drain pipe is connected to the bottom of the air-cooled air conditioner outdoor unit, and a defrost drain valve is arranged on the defrost drain pipe.

4. The geothermal heat exchange and air conditioning comprehensive utilization system according to claim 1 or 2, characterized in that: The air-cooled air conditioner indoor unit is provided with a condensed water discharge port, and the condensed water discharge port is connected to a condensed water discharge pipe.

5. The geothermal heat exchange and air conditioning comprehensive utilization system according to claim 1 or 2, characterized in that: The buried pipe heat exchanger includes a steel pipe pile, a heat-conducting fin is arranged on the outer peripheral wall of the steel pipe pile, and a partition is arranged in the inner cavity of the steel pipe pile, and the partition divides the inner cavity of the steel pipe pile into an air inlet chamber and an air outlet chamber, and the bottoms of the air inlet chamber and the air outlet chamber are connected.

6. The geothermal heat exchange and air conditioning comprehensive utilization system according to claim 5, characterized in that: The heat conducting fins are designed in a sheet or spiral shape.

7. The geothermal heat exchange and air conditioning comprehensive utilization system according to claim 1 or 2, characterized in that: The outer side of the connecting pipe is coated with a heat-insulating layer.

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