Open type buried pipe fresh air heat exchange system

Abstract

The utility model discloses an open type buried pipe fresh air heat exchange system which comprises a plurality of buried pipe heat exchangers extending into deep soil in the longitudinal direction, the buried pipe heat exchangers are connected in series through communicating pipes, and the buried pipe heat exchangers connected in series form a buried heat exchange module. An air outlet of the buried heat exchange module is connected with the circulating fan, the circulating fan is connected with the air collection chamber, the air collection chamber is connected with an air feeder of the bidirectional flow fresh air ventilator, and the air feeder of the bidirectional flow fresh air ventilator is connected with the air supply pipeline; an exhaust fan of the bidirectional flow fresh air machine is connected with an air return pipeline and an exhaust pipeline, and the exhaust pipeline is connected with an air inlet of the buried heat exchange module. The indoor unit is ingenious and reasonable in structural design, ground source heat energy can be fully utilized by matching the ground heat exchanger with the circulating fan and the two-way flow fresh air fan, and alternate operation of two working conditions of internal circulation and external ventilation can be realized, so that fresh and clean air is always provided for the interior of a room, and the indoor unit is environment-friendly and energy-saving. And a relatively comfortable temperature and humidity state is kept indoors.

Description

Technical Field

[0001] The utility model relates to the technical field of building energy-saving design, in particular to an open underground pipe fresh air heat exchange 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 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 air conditioning. However, the fresh air circulation design in this case is not reasonable enough, and the operating conditions cannot be switched. As a result, as the system operation time increases, the indoor temperature and humidity cannot always be kept in a good and comfortable state. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an open type underground pipe fresh air heat exchange system which has a reasonable design and can automatically realize the switching of different working conditions, so as to always keep the room in a good and comfortable state.

[0006] In order to solve the above technical problems, the technical solution of the utility model is:

[0007] The open type underground pipe fresh air heat exchange system comprises a plurality of underground pipe 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 pipe heat exchangers in series. The underground pipe heat exchangers connected in series constitute an underground heat exchange module.

[0008] The air outlet of the underground heat exchange module is connected to the air inlet of the circulation fan through the air supply duct, the air outlet of the circulation fan is connected to the air collecting chamber, the air collecting chamber is connected to the air supply fan of the two-way flow fresh air fan, the air supply fan of the two-way flow fresh air fan is connected to the air supply duct, and the air supply duct is provided with an air supply outlet; the exhaust fan of the two-way flow fresh air fan is connected to the return air duct and the exhaust duct, the return air duct is provided with a return air outlet, and the exhaust duct is connected to the air inlet of the underground heat exchange module;

[0009] The air supply duct is provided with an air supply control valve, and the exhaust duct is provided with an exhaust control valve; the exhaust duct is connected with an air exchange inlet pipe and an air exchange outlet pipe, the air exchange inlet pipe is provided with a fresh air inlet valve, and the air exchange outlet pipe is provided with an air exchange outlet valve.

[0010] As a preferred technical solution, the air supply duct is connected to a flushing discharge pipe, and a flushing discharge valve is installed on the flushing discharge pipe.

[0011] As a preferred technical solution, 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.

[0012] As a preferred technical solution, the heat-conducting fins are designed in a sheet or spiral shape.

[0013] As a preferred technical solution, the outer side of the connecting pipe is coated with a thermal insulation layer.

[0014] Due to the adoption of the above technical scheme, the utility model has at least the following beneficial effects: the structural design is ingenious and reasonable, and the ground source thermal energy can be fully utilized by means of the buried pipe heat exchanger in conjunction with the circulating fan and the two-way flow fresh fan, and the alternating operation of the two working conditions of internal circulation and external ventilation can be realized, thereby always providing comfortable and clean air for the room, so that the room maintains a more comfortable temperature and humidity state. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0016] Figure 1 It is a system schematic diagram of an embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the underground pipe heat exchanger in the embodiment of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the underground heat exchange module. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Needless to say, those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0020] like Figure 1 As shown, the open type underground pipe fresh air heat exchange system comprises a plurality of underground pipe heat exchangers 1 buried in the underground foundation and extending longitudinally into the deep soil. A connecting pipe 2 is also buried in the underground foundation to connect the underground pipe heat exchangers 1 in series. The underground pipe heat exchangers 1 connected in series constitute an underground heat exchange module.

[0021] The air outlet of the underground heat exchange module is connected to the air inlet of the circulation fan 4 through the air supply duct 3, the air outlet of the circulation fan 4 is connected to the air collecting chamber 5, the air collecting chamber 5 is connected to the air supply fan of the two-way flow fresh air fan 6, the air supply fan of the two-way flow fresh air fan 6 is connected to the air supply duct 7, and the air supply duct 7 is provided with an air supply port 8; the exhaust fan of the two-way flow fresh air fan 6 is connected to the return air duct 9 and the exhaust air duct 10, the return air duct 9 is provided with a return air port 11, and the exhaust air duct 10 is connected to the air inlet of the underground heat exchange module;

[0022] The air supply duct 3 is provided with an air supply control valve 12, and the exhaust duct 10 is provided with an exhaust control valve 13; the exhaust duct 10 is connected with an air exchange inlet pipe 14 and an air exchange outlet pipe 15, the air exchange inlet pipe 14 is provided with a fresh air inlet valve 16, and the air exchange outlet pipe 15 is provided with an air exchange outlet valve 17. The air supply duct 3 is connected with a flushing discharge pipe 18, and a flushing discharge valve 19 is installed on the flushing discharge pipe 18.

[0023] refer to Figure 2The buried pipe heat exchanger 1 comprises a steel pipe pile 101, and a heat conducting fin 102 is arranged on the outer peripheral wall of the steel pipe pile 101. The heat conducting fin 102 is preferably designed in a spiral shape. The steel pipe pile 101 can effectively play a role in the anti-floating of the foundation, and the spiral heat conducting fin 102 design can better improve the anti-floating ability of the pile raft foundation; the inner cavity of the steel pipe pile 101 is provided with a partition 103, and the partition 103 divides the inner cavity of the steel pipe pile into an air inlet chamber 104 and an air outlet chamber 105. The bottoms of the air inlet chamber 104 and the air outlet chamber 105 are connected to form a "U-shaped tube". Reference Figure 3 , multiple steel pipe piles 101 are connected by connecting pipes 2 to form multiple series loops with close friction resistance. Air enters from one side of the partition 103, flows to the bottom connecting part of the steel pipe pile 101, and then flows out through the other side of the partition 103 to enter the next series steel pipe pile 101. After passing through multiple steel pipe piles 101, 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. Multiple series loops are connected at the same time to form a parallel loop to increase the ventilation volume.

[0024] The connecting pipe 2 is buried 1.5 meters underground. After the trenching of the building unit foundation is completed, the connecting pipe is laid. A thermal insulation layer and a protective layer are made on the outside of the connecting pipe 2 and backfilled together with the foundation.

[0025] This system uses large-leaf spiral steel pipe piles as underground heat exchangers, which are constructed together with the foundation construction. The air circulation in this underground heat exchanger is open ventilation, and the system has two operating conditions:

[0026] First working condition: the air supply control valve 12 and the exhaust control valve 13 are open, the fresh air inlet valve 16, the air exchange outlet valve 17 and the flushing discharge valve 19 are closed, the circulating fan 4 and the two-way flow fresh air fan 6 are turned on, the underground heat exchanger 1 extracts low-grade air from the room, and after heat exchange through multiple groups of underground heat exchangers, the air exchanges energy with the soil, and then the hot (cold) air is sent to the air collecting chamber 5 through the circulating fan 1, and then the two-way flow fresh air fan 6 completes the fresh air processing, so that the refreshing and clean air is sent into the room through the air supply port 8. At the same time, the dirty air in the room is discharged into the underground heat exchanger 1 through the two-way flow fresh air fan 6 from the return air port 11, and re-participates in the heat exchange of the underground heat exchanger 1, and then the circulating fan 4 sends the air to the two-way flow fresh air fan 6, and the two-way flow fresh air fan 6 purifies and dehumidifies the air and sends it into the room, and the air continues to circulate.

[0027] Second working condition: After the first working condition circulates for a period of time, the circulating air has been polluted by carbon dioxide, so the outdoor fresh air inlet valve 16 and the air exchange outlet valve 17 are opened regularly, and the exhaust control valve 13 is closed. At this time, the outdoor fresh air is introduced from the fresh air inlet valve 16, and the air enters the underground heat exchanger 1 for heat exchange, and then the two-way flow fresh air fan 6 completes the fresh air treatment and sends it to the room. The indoor polluted air is discharged from the return air port 11 through the two-way flow fresh air fan 2, and discharged to the outside through the air exchange outlet valve 17. The fresh air inlet 16 and the air exchange outlet are kept at an appropriate distance.

[0028] The above two working conditions are operated alternately, and the valve opening and closing and operation interval are set. In this way, the room is always provided with comfortable and clean air, which can keep the room at a more comfortable temperature and humidity.

[0029] When the system is idle, it can be cleaned with high-pressure air and water. First, ensure that the system stops running, close the air supply control valve 12 and the exhaust control valve 13, open the fresh air inlet valve 16 and the flushing discharge valve 19, press high-pressure air-water mixed liquid into the fresh air inlet valve 16, and discharge pollutants from the flushing discharge valve 19. After flushing is completed, close the fresh air inlet valve 16 and the flushing discharge valve 19, open the air supply control valve 12 and the exhaust control valve 13 to enter normal working state.

[0030] The above description is only an illustrative embodiment of the utility model and is not intended to limit the scope of the utility model. Each valve is preferably an electric control valve, and any equivalent changes and modifications made by any technician in this field without departing from the concept and principle of the utility model should fall within the scope of protection of the utility model.

Claims

1. An open type underground pipe fresh air heat exchange system, comprising a plurality of underground pipe heat exchangers buried in an underground foundation and extending longitudinally into the deep soil, characterized in that: A connecting pipe is also buried in the underground foundation to connect the underground heat exchangers in series, and the underground heat exchangers connected in series form an underground heat exchange module; The air outlet of the underground heat exchange module is connected to the air inlet of the circulation fan through the air supply duct, the air outlet of the circulation fan is connected to the air collecting chamber, the air collecting chamber is connected to the air supply fan of the two-way flow fresh air fan, the air supply fan of the two-way flow fresh air fan is connected to the air supply duct, and the air supply duct is provided with an air supply outlet; the exhaust fan of the two-way flow fresh air fan is connected to the return air duct and the exhaust duct, the return air duct is provided with a return air outlet, and the exhaust duct is connected to the air inlet of the underground heat exchange module; The air supply duct is provided with an air supply control valve, and the exhaust duct is provided with an exhaust control valve; the exhaust duct is connected with an air exchange inlet pipe and an air exchange outlet pipe, the air exchange inlet pipe is provided with a fresh air inlet valve, and the air exchange outlet pipe is provided with an air exchange outlet valve.

2. The open underground pipe fresh air heat exchange system according to claim 1, characterized in that: The air supply duct is connected with a flushing discharge pipe, and a flushing discharge valve is installed on the flushing discharge pipe.

3. The open underground pipe fresh air heat exchange system according to claim 1, 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.

4. The open underground pipe fresh air heat exchange system according to claim 3, characterized in that: The heat conducting fins are designed in a sheet or spiral shape.

5. The open underground pipe fresh air heat exchange system according to any one of claims 1 to 4, characterized in that: The outer side of the connecting pipe is coated with a heat-insulating layer.

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