CN215766608U

CN215766608U - Heat exchanger for shallow geothermal energy heating and equipment thereof

Info

Publication number: CN215766608U
Application number: CN202121792267.0U
Authority: CN
Inventors: 杨永涛; 陈茜; 李凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-02-08
Anticipated expiration: 2031-08-02

Abstract

The utility model provides a heat exchanger for shallow geothermal energy heating and equipment thereof, wherein the heat exchanger comprises: the anti-freezing water tank is filled with anti-freezing medium; the refrigerant buffering end of the refrigerant pipeline is internally provided with the anti-freezing water tank, and is in contact with the anti-freezing medium; and the anti-freezing water tank is arranged in the water pipe buffering end of the water pipe, and the water pipe buffering end is in contact with the anti-freezing medium. The utility model aims to provide a heat exchanger for shallow geothermal energy heating and equipment thereof, which well solve the problem that the energy efficiency ratio of shallow geothermal energy heating equipment is influenced because local freezing is easy to occur in the conventional heat exchanger.

Description

Heat exchanger for shallow geothermal energy heating and equipment thereof

Technical Field

The utility model relates to the technical field of heating, in particular to a heat exchanger for shallow geothermal energy heating and equipment thereof.

Background

In order to reduce the carbon emission and realize the carbon peak-reaching target, the country requires to dismantle a small boiler, and heating in a non-central heating area becomes a problem. In the prior art, generally, shallow geothermal energy is used for heating shallow geothermal energy, namely geothermal energy with the water temperature of 0-200 meters underground and the water temperature of about 15 ℃, underground water is pumped out of the ground, a heat pump (air conditioner compressor equipment) is used for pumping heat in the underground water to heating circulating water, and the underground water is cooled to be close to 0 ℃ at the temperature and then is discharged back to the ground.

But in order to save the power of the well pump, the drainage temperature of the groundwater needs to be controlled to be close to 0 ℃. The common heat exchanger types comprise a plate heat exchanger and a shell-and-tube heat exchanger, and the two heat exchangers have the defects that a refrigerant is easy to evaporate locally to absorb a large amount of heat to form local low temperature, the underground water is easy to freeze locally, ice is not a good heat conductor, and the energy efficiency ratio of the whole set of shallow geothermal energy heating equipment is greatly reduced after freezing.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a heat exchanger for shallow geothermal energy heating and equipment thereof, and aims to solve the problem that the energy efficiency ratio of shallow geothermal energy heating equipment is influenced because local freezing is easy to occur in the conventional heat exchanger.

The utility model provides a heat exchanger for shallow geothermal energy heating, comprising: the anti-freezing water tank is filled with anti-freezing medium; the refrigerant buffering end of the refrigerant pipeline is internally provided with the anti-freezing water tank, and is in contact with the anti-freezing medium; and the anti-freezing water tank is arranged in the water pipe buffering end of the water pipe, and the water pipe buffering end is in contact with the anti-freezing medium.

Furthermore, the refrigerant buffer end and the water pipe buffer end are both fin heat exchange surfaces; the fin heat exchange surface comprises a plurality of finned tubes.

Further, the water pipeline with the water tank that prevents frostbite can be dismantled and be connected.

Further, the antifreezing medium is in a gas state or a liquid state.

A shallow geothermal energy heating device comprises a heat pump, a floor heater and a shallow geothermal energy heating heat exchanger; the heat exchanger comprises a chamber side heat exchanger and a well side heat exchanger, and a refrigerant pipeline of the chamber side heat exchanger is communicated with a refrigerant pipeline of the well side heat exchanger through a heat pump; the water pipeline of the chamber side heat exchanger is communicated with the ground heating system through a first circulating pipeline, and the water pipeline of the well side heat exchanger is communicated with the well through a second circulating pipeline.

Furthermore, a circulating pump is installed on the first circulating pipeline, and a well pump is installed on the second circulating pipeline.

Further, the shallow geothermal energy heating equipment also comprises a first temperature detector and a second temperature detector; the first temperature detector is installed on the return water side of the first circulating pipeline, and the second temperature detector is installed in an anti-freezing water tank of the well side heat exchanger.

According to the technical scheme, the anti-freezing water tanks are arranged in the refrigerant buffering end of the refrigerant pipeline and the water pipe buffering end of the water pipeline and are in contact with the anti-freezing medium, the heating surface of the water pipe buffering end can be uniformly heated through convection heat exchange of the anti-freezing medium, even if the refrigerant is locally evaporated to absorb a large amount of heat to form local low temperature, underground water in the water pipe buffering end cannot be locally frozen due to the buffering effect of the anti-freezing medium, and only the underground water can be uniformly frozen; therefore, the energy efficiency ratio of the whole set of shallow geothermal energy heating equipment cannot be influenced; the problem that the energy efficiency ratio of shallow geothermal energy heating equipment is affected due to the fact that local freezing is easy to occur in an existing heat exchanger is well solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a front cross-sectional view of a shallow geothermal heating heat exchanger according to an embodiment of the utility model;

FIG. 2 is a schematic structural diagram of a shallow geothermal energy heating apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a fin heat exchange surface according to an embodiment of the present invention.

Description of reference numerals:

1 is a heat exchanger, 11 is an anti-freezing water tank, 111 is an anti-freezing medium, 12 is a chamber side heat exchanger, 13 is a well side heat exchanger, 14 is a refrigerant pipeline, 141 is a refrigerant buffer end, 15 is a water pipeline, and 151 is a water pipe buffer end; 16 is a finned tube;

2 is a heat pump; 3 is a ground heater; 4 is a first circulating pipeline, 41 is a circulating pump, and 42 is a first temperature detector; 5 is a second circulating pipeline, 51 is a well pump, 52 is a second temperature detector;

the arrow indicates the direction of water circulation.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present invention provides a shallow geothermal heating heat exchanger 1, which includes: an anti-freezing water tank 11 filled with an anti-freezing medium 111; the refrigerant pipeline 14, the refrigerant buffer end 141 of which is internally provided with the anti-freezing water tank 11, and the refrigerant buffer end 141 of which is in contact with the anti-freezing medium 111; the water pipe 15 has a water pipe buffering end 151 in which the antifreeze water tank 11 is disposed, and the water pipe buffering end 151 is in contact with the antifreeze medium 111.

The antifreezing water tank 11 is arranged in the refrigerant buffer end 141 of the refrigerant pipeline 14 and the water pipe buffer end 151 of the water pipeline 15, and is in contact with the antifreezing medium 111, so that the heating surface of the water pipe buffer end 151 can be uniformly heated through the convective heat transfer of the antifreezing medium 111, even if the refrigerant is locally evaporated in a large quantity to form local low temperature, the underground water in the water pipe buffer end 151 cannot be locally frozen due to the buffer effect of the antifreezing medium, and only can be uniformly frozen; therefore, the energy efficiency ratio of the whole set of shallow geothermal energy heating equipment cannot be influenced; the problem that the energy efficiency ratio of shallow geothermal energy heating equipment is affected due to the fact that local freezing is easy to occur in an existing heat exchanger is well solved.

Referring to fig. 3, further, the refrigerant buffer end 141 and the water pipe buffer end 151 are both fin heat exchange surfaces, and the fin heat exchange surfaces can increase contact areas between the refrigerant buffer end 141 and the water pipe buffer end 151 and the anti-freezing medium 111, so as to increase heat exchange efficiencies between the refrigerant buffer end 141 and the water pipe buffer end 151 and the anti-freezing medium 111.

Preferably, the fin heat exchange surface is formed by combining a plurality of finned tubes 16, fins are arranged on the outer surfaces of the finned tubes 16, the contact area between the finned tubes 16 and the anti-freezing medium 111 can be increased through the fins, and the problem of improving the heat exchange efficiency is further solved.

Further, the water pipeline 15 and the anti-freezing water tank 11 are detachably connected, and the water pipeline 15 is convenient to take out when heated and scaled in the water pipeline 15 for subsequent scale removal.

Further, the anti-freezing medium 111 is in a gas state or a liquid state, and has the characteristics of good convection heat transfer effect and difficulty in freezing.

Referring to fig. 2, the utility model provides a shallow geothermal energy heating device, which comprises a heat pump 2, a floor heating device 3 and a shallow geothermal energy heating heat exchanger 1; the heat exchanger 1 comprises a chamber side heat exchanger 12 and a well side heat exchanger 13, and a refrigerant pipeline 14 of the chamber side heat exchanger 12 is communicated with a refrigerant pipeline 14 of the well side heat exchanger 13 through a heat pump 2; the water pipeline 15 of the chamber side heat exchanger 12 is communicated with the floor heating unit 3 through a first circulating pipeline 4, and the water pipeline 15 of the well side heat exchanger 13 is communicated with the water well through a second circulating pipeline 5.

Firstly, the groundwater in the well flows into the water pipeline 15 of the well side heat exchanger 13 through the second circulating pipeline 5, the groundwater in the water pipeline 15 exchanges heat with the refrigerant of the refrigerant pipeline 14 through the antifreezing medium 111, the heat pump 2 carries the groundwater with low temperature into the circulating water with high temperature, the refrigerant of the refrigerant pipeline of the chamber side heat exchanger exchanges heat with the circulating water of the water pipeline through the antifreezing medium, the circulating water in the floor heating system is heated, and finally the heating purpose is achieved.

The heat pump has the working principle that heat in underground water with low temperature is transferred to circulating water with high temperature, and the heat pump is based on four working processes of adiabatic compression, isothermal condensation, adiabatic expansion and isothermal evaporation, wherein the adiabatic compression means that a refrigerant is compressed to a certain pressure, and the temperature of the refrigerant is increased; the isothermal condensation means that the compressed refrigerant enters a condenser to be condensed to release a large amount of heat; adiabatic expansion means that the pressure of the condensed liquid refrigerant is sharply reduced through a pressure reducing valve and expanded; isothermal evaporation refers to that a low-pressure liquid refrigerant absorbs a large amount of heat and evaporates into a gaseous state, and then enters a compressor from the gaseous state, and the existing principle is applied to equipment such as an air conditioner and the like.

That is, in the chamber-side heat exchanger 12, the refrigerant releases a large amount of heat to enter the antifreezing medium 111 to heat the circulating water in the floor heating 3, and finally the purpose of heating is achieved; in the well-side heat exchanger 13, the liquid refrigerant absorbs a large amount of heat from the antifreeze medium 111 and evaporates into a gaseous state, and the absorbed heat is derived from the heat released from the groundwater to the antifreeze medium 111.

Further, a circulation pump 41 is installed on the first circulation pipe 4, and a well pump 51 is installed on the second circulation pipe 5 for carrying water.

Further, the shallow geothermal energy heating apparatus further includes a first temperature detector 42 and a second temperature detector 52.

The first temperature detector 42 is installed on the return water side of the first circulation pipeline 4, and the working output of the compressor is controlled by using the temperature value monitored by the first temperature detector 42 as a reference (generally, the output is controlled by controlling the rotating speed of the frequency converter) to keep the return water temperature of the circulation water at a set temperature.

The second temperature detector 52 is installed in the anti-freezing water tank 11 of the well side heat exchanger 13, and the flow rate of the well pump 51 is controlled (the flow rate is controlled by controlling the rotation speed through a frequency converter) by using the temperature value monitored by the second temperature detector 52 as a reference, so as to maintain the temperature of the anti-freezing medium 111 at 0 ℃ and prevent the anti-freezing medium 111 from being lower than 0 ℃ to cause the occurrence of freezing in the water pipe 15 of the well side heat exchanger 13.

Since the heat pump 2 can be reversed or stopped, when the well pump 51 stops running due to a fault, the temperature of the antifreeze 111 of the well side heat exchanger 13 is far lower than 0 ℃, and further the water pipeline 15 of the well side heat exchanger 13 is completely frozen, the water pipeline 15 of the well side heat exchanger 13 can be thawed by only stopping running or reversing the heat pump 2 to warm the antifreeze 111 to more than 0 ℃.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat exchanger for shallow geothermal energy heating, comprising:

the anti-freezing water tank is filled with anti-freezing medium;

the refrigerant buffering end of the refrigerant pipeline is internally provided with the anti-freezing water tank, and is in contact with the anti-freezing medium;

and the anti-freezing water tank is arranged in the water pipe buffering end of the water pipe, and the water pipe buffering end is in contact with the anti-freezing medium.

2. The shallow geothermal energy heating heat exchanger of claim 1, wherein the refrigerant buffer end and the water pipe buffer end are both fin heat exchange surfaces;

the fin heat exchange surface comprises a plurality of finned tubes.

3. The shallow geothermal energy heating heat exchanger according to claim 1, wherein the water pipe is detachably connected to the antifreeze water tank.

4. The shallow geothermal energy heating heat exchanger according to claim 1, wherein the antifreeze medium is in a gaseous state or a liquid state.

5. A shallow geothermal energy heating device, which is characterized by comprising a heat pump, a ground heater and the shallow geothermal energy heating heat exchanger of claims 1-4;

the heat exchanger comprises a chamber side heat exchanger and a well side heat exchanger, and a refrigerant pipeline of the chamber side heat exchanger is communicated with a refrigerant pipeline of the well side heat exchanger through a heat pump;

the water pipeline of the chamber side heat exchanger is communicated with the ground heating system through a first circulating pipeline, and the water pipeline of the well side heat exchanger is communicated with the well through a second circulating pipeline.

6. The shallow geothermal energy heating facility of claim 5, wherein the first circulation pipe is provided with a circulation pump, and the second circulation pipe is provided with a well pump.

7. The shallow geothermal energy heating facility according to claim 5, further comprising a first temperature detector and a second temperature detector;

the first temperature detector is installed on the return water side of the first circulating pipeline, and the second temperature detector is installed in an anti-freezing water tank of the well side heat exchanger.