KR102286805B1 - An underground heat source heat pump system using ethanol having an intermediate heat exchanger - Google Patents

Abstract

The present invention relates to a geothermal heat source heat pump system having an ethanol intermediate heat exchanger, and more particularly, to provide a geothermal heat source heat pump system having an ethanol intermediate heat exchanger which receives a heat source by using a geothermal heat exchanger, forms two intermediate heat exchangers in a closed loop shape in a heat pump unit to prevent a heat source side pipe and a demand source pipe from being directly connected to the heat pump unit and to enable the pipes to be connected through the intermediate heat exchanger, and uses ethanol and brine as a refrigerant inside the closed loop, thereby not only operating in low-temperature, but also reducing use of antifreeze as compared to an existing system and preventing environmental pollution due to external leakage of the antifreeze due to breakage of a device.

Description

An underground heat source heat pump system using ethanol having an intermediate heat exchanger}

The present invention uses a geothermal heat source through a geothermal heat exchanger, uses ethanol or brine as a refrigerant, and uses a plurality of intermediate heat exchangers to have a closed loop shape so that the heat pump unit does not directly exchange heat with the heat source unit and the place of use It relates to a geothermal heat source heat pump system having an ethanol intermediate heat exchanger.

Looking at the conventional heat pump system, the heat source side circulating water and the load side circulating water are directly circulated to the condenser and the evaporator installed inside the heat pump to heat or cool, and has a structure for cooling or heating.

Such a heat pump is a device that uses a phase change of a refrigerant to acquire heat at a low temperature and transfer heat to a high temperature part. The circulating water (heat source, load) in the evaporator of the pump was frozen, and there was a problem that could freeze the device, so another antifreeze had to be used.

In addition, some heat sources require a large amount of antifreeze, and there is a disadvantage that continuous injection is required because the freezing temperature rises due to the decrease in the specific gravity of the antifreeze due to the damage of the connection pipe or the slight leakage.

In addition, groundwater contamination is caused by breakage of the heat exchanger connection pipe for heat source or antifreeze leakage, and when using circulating water that is not antifreeze, it is used only at room temperature (5°C or higher), so operation time and capacity are limited.

Accordingly, there is an urgent need to develop a device capable of solving these problems.

Republic of Korea Patent Publication No. 10-1049278 (registered on July 7, 2011)

The present invention has been devised to solve the above problems, and an object of the present invention is to perform heat exchange by directly connecting heat pump parts to a heat source side and a load side in an existing heat pump system, and to generate heat generated by using circulating water. In order to solve various problems and shortcomings, a geothermal heat source is used through an underground heat exchanger, and a plurality of intermediate heat exchangers are installed on the heat source side and the load side, respectively, and then heat exchange with the heat pump unit through this, and the heat pump unit To provide a geothermal heat source heat pump system having an ethanol intermediate heat exchanger that can reduce the amount of antifreeze used and prevent environmental pollution due to external leakage of antifreeze by having a closed loop form without direct heat exchange with a heat source or load side. there is.

Other objects and advantages of the present invention will be set forth below and will be learned by way of example of the present invention. Further, the objects and advantages of the present invention may be realized by means and combinations indicated in the claims.

The present invention is a means for solving the above problems,

a heat source unit 10 in which a geothermal heat source is used through a geothermal heat exchanger 11;

A compressor (21) for condensing the refrigerant (C), a first heat exchanger (23) serving as a condenser of the refrigerant, an expansion valve (24) lowering the pressure of the refrigerant, and a second heat exchanger (25) serving as an evaporator of the refrigerant a heat pump unit 20 made of;

Installed between the heat source unit 10 and the heat pump unit 20 , water is used as a refrigerant in the first line L1 connected to the heat source unit 10 , and the second line connected to the heat pump unit 20 . In the line (L2), the first intermediate heat exchanger 40 in which the second refrigerant (B) of ethanol or brine is used;

The second refrigerant (B) of ethanol or brine is used in the third line (L3) connected to the heat pump unit 20 and installed between the heat pump unit 20 and the place of use (30), and the place of use (30) and A second intermediate heat exchanger 50 in which water is used as a refrigerant in the connected fourth line (L4); consists of,

The second refrigerant (B) is used only in the second and third lines (L2, L3) and has a closed loop shape with the heat pump unit 20 , and the refrigerant (C) of the heat pump unit 20 is transferred to the heat source unit 10 ) and not used for direct heat exchange with the place of use (30), it is characterized in that it is possible to prevent in advance the environmental pollution caused by leakage of ethanol or brine to the outside in case of damage or failure.

As described above, the present invention arranges two intermediate heat exchangers in the heat pump unit to form a closed loop that does not directly exchange heat with a heat source and a place of use, and injects the used brine into the heat pump unit. By doing so, there is an effect that it is possible to implement a system that can be operated even at low temperatures.

In addition, the present invention has the effect of reducing the amount of antifreeze used and preventing environmental pollution due to external leakage of the antifreeze, compared to the conventional heat pump system.

In addition, according to the present invention, damage is prevented as the heat pump unit has a closed loop structure, and the intermediate heat exchange unit and the piping on the heat source side or load side connected thereto can be easily maintained with a simple operation of cleaning or replacing.

In addition, the present invention has an effect of selectively using two lines: a line using water as a refrigerant and a line using ethanol or brine as a refrigerant in connecting the place of use and the heat source to the heat pump unit.

1 is a view of an embodiment showing a geothermal heat source heat pump system having an ethanol intermediate heat exchanger according to the present invention.
2 is a view showing another embodiment of a geothermal heat source heat pump system having an ethanol intermediate heat exchanger according to the present invention.
3 is a view showing an example of a geothermal heat exchanger according to the present invention.

Before describing various embodiments of the present invention in detail, it is to be understood that the application is not limited to the details of the construction and arrangement of components described in the following detailed description or shown in the drawings. The invention is capable of being embodied and practiced in other embodiments and of being carried out in various ways. Also, device or element orientation (eg "front", "back", "up", "down", "top", "bottom") The expressions and predicates used herein with respect to terms such as ", "left", "right", "lateral", etc. are used merely to simplify the description of the invention, and the associated apparatus Or it will be appreciated that it does not simply indicate or imply that an element must have a particular orientation. Also, terms such as “first” and “second” are used in this application and the appended claims for the purpose of description and are not intended to indicate or imply relative importance or spirit.

In order to achieve the above object, the present invention has the following features.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all of the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

Hereinafter, a geothermal heat source heat pump system having an ethanol intermediate heat exchanger according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3 .

The geothermal heat source heat pump system having an ethanol intermediate heat exchanger of the present invention includes two embodiments.

1, the first embodiment is as follows, and includes a heat pump unit 20 , a first intermediate heat exchanger 40 , and a second intermediate heat exchanger 50 .

The heat pump unit 20 is installed between the heat source unit 10 in which the underground heat source through the underground heat exchanger 11 is used and the place of use 30 using the heat source of the heat source unit 10 .

Here, a geothermal heat source through a geothermal heat exchanger 11 is used as the heat source unit 10, and an open geothermal heat exchanger or a vertically sealed geothermal heat exchanger is used as the geothermal heat exchanger 11, and the use 30 is hot water supply. Pipes, FCU (Fan Coil Unit), heat storage tank, etc. can be the target.

Looking at the configuration of the heat pump unit 20 in detail, the compressor 21 for compressing the refrigerant (C, the third refrigerant) in the low-temperature and low-pressure gaseous phase to high-temperature and high-pressure, and a condenser that is connected to the compressor 21 to condense the refrigerant. The first heat exchanger 23 of It consists of a group (25).

Of course, the first and second heat exchangers 23 and 25 may be used as either a condenser or an evaporator depending on the flow direction of the refrigerant flowing through the heat pump unit 20, and for controlling the flow direction of this refrigerant , it is natural that the four-way valve 22 may be installed on the refrigerant pipe in the heat pump unit 20 .

The first intermediate heat exchanger 40 is installed between the heat source unit 10 and the heat pump unit 20 described above, and water is used as a refrigerant in the first line L1 connected to the heat source unit 10, In the second line (L2) connected to the heat pump unit 20, the second refrigerant (B) of ethanol or brine is used.

The second intermediate heat exchanger 50 is installed between the above-described heat pump unit 20 and the place of use 30 , and in the third line L3 connected to the heat pump unit 20 , a second refrigerant of ethanol or brine (B) is used, and water is used as a refrigerant in the fourth line (L4) connected to the place of use (30).

That is, the second refrigerant (B) in which ethanol or brine is used instead of water is used only in the second and third lines (L2, L3) and has a closed loop shape with the heat pump unit 20, and the heat pump unit 20 ) of the refrigerant (C) is not used for direct heat exchange with the heat source unit 10 and the place of use 30, so that environmental pollution caused by leakage of ethanol or brine to the outside in case of damage or failure can be prevented in advance. it was made to

In addition, as the second refrigerant (B) used in the second and third lines (L2, L3), when ethanol is used, ethanol is mixed with water and used as an ethanol mixture, and ethanol in water is 10 to 15% Mix and avoid freezing to -6°C.

Accordingly, in the present invention, the measuring means 70 and the additional supply unit 71 are further installed in each of the second and third lines L2 and L3.

The measuring means 70 is a device for detecting a part of the ethanol mixture flowing in each of the second and third lines (L2, L3), and measuring whether the mixing ratio of ethanol and water falls within a preset mixing ratio range, and the additional The supply unit 71 supplies ethanol or water to the second and third lines L2 and L3 according to the measurement value transmitted from the measuring means 40, so that the ethanol and water of the ethanol mixture have a preset mixing ratio range. to make it happen

2. The second embodiment is as follows, and the third and fourth heat exchangers 26 and 27 and the fifth and sixth lines (L5, L6) are further added to the first embodiment.

The third heat exchanger 26 is directly connected to the fourth line L4 without going through the second intermediate heat exchanger 50 and has a sixth line L6 in which water is used as a refrigerant, and serves as a condenser of the refrigerant. It is an additional heat exchanger that

The fourth heat exchanger 27 also has a fifth line L5 connected to the first line L1 without going through the first intermediate heat exchanger 40 to use water as a refrigerant, and serves as an evaporator of the refrigerant. used as an additional heat exchanger.

To this end, in the heat pump unit 20, the refrigerant passing through the compressor 21 through the first branch line (a) is connected to be branched to the first and third heat exchangers 23 and 26, and the second Unlike the first embodiment, the condenser and the evaporator are configured so that the refrigerant passing through the expansion valve 24 can be branched to the second and fourth heat exchangers 25 and 27 through the branch line (b). Each of the two heat exchangers is configured to be used selectively.

In addition, a three-way valve (3V), etc. is installed in the first branch line (a) where the line (pipe) is branched from the compressor 21 and the refrigerant flows to the first and third heat exchangers 23 and 26, respectively, which will be described later. By the control unit 61 to be controlled, the refrigerant flows to one of the first and third heat exchangers 23 and 26. Of course, a three-way valve (3V) is also installed in the second branch line (b) where the line is branched from the expansion valve (24) and the refrigerant flows to the second and fourth heat exchangers (25, 27), respectively, and a control unit ( 61), it will be natural that the refrigerant is controlled to flow to one of the second and fourth heat exchangers 25 and 27.

When the fifth line L5 added in the second embodiment is described in this way,

The fifth line (L5) directly connects the heat source unit 10 and the fourth heat exchanger 27, and uses water as a refrigerant. The heat source of the heat source unit 10 is directly connected to the heat pump unit 20 ) to be transferred to the heat exchange through the fourth heat exchanger (27).

That is, the heat source unit 10 and the heat pump unit 20 have a structure connected to the fourth heat exchanger 27 while using water as a refrigerant through the fifth line L5, and the second line L2 through While using the second refrigerant (B) of ethanol or brine, there are a total of two refrigerant transfer lines having a structure connected to the second heat exchanger 25 through the first and second lines (L1, L2).

When explaining the sixth line L6 added in the second embodiment,

The sixth line (L6) is a line that directly connects the third heat exchanger 26 of the heat pump unit 20 to the user 30, and is a line in which water is used as a refrigerant.

That is, the heat pump unit 20 and the destination 30 are connected to the third heat exchanger 26 while using water as a refrigerant through the sixth line L6, and ethanol through the third line L3. Alternatively, while using the second refrigerant (B) of the brine, there are a total of two refrigerant transfer lines having a structure connected to the first heat exchanger 23 through the third and fourth lines (L3, L4).

As mentioned above, in the second embodiment,

The heat source unit 10 and the fourth heat exchanger 27 are connected through a fifth line (L5), and the place of use 30 and the third heat exchanger 26 are connected through a sixth line (L6), , The fifth line (L5) and the sixth line (L6) have a first refrigerant line using water as a refrigerant as a refrigerant, and the first refrigerant line between the heat source unit (10) and the first intermediate heat exchanger (40) Water is used as the first refrigerant (A) in the first line (L1) and the second intermediate heat exchanger (50) and the fourth line (L4), which is between the use place (30).

However, the second line (L2) connecting between the first intermediate heat exchanger (40) and the second heat exchanger (25) and the first connecting between the first heat exchanger (23) and the second intermediate heat exchanger (50) In line 3 (L3), a second refrigerant (B) of ethanol or brine is used as a refrigerant, thereby forming another refrigerant line that does not use water as a refrigerant.

Accordingly, in the present invention, unlike the existing method in which only water (fresh water) is used as the refrigerant (A), driving is possible even at low temperatures through the line using the second refrigerant (B), and all ethanol or brine instead of the refrigerant (water) However, ethanol or brine is used only in the second and third lines (L2, L3), which are part of it, so that the amount of ethanol or brine can be reduced.

In addition, as the second refrigerant (B) is used in the second and third lines (L2, L3), when water is used as a refrigerant, the water freezes in the winter season, and the disadvantage of freezing pipes and various equipment on the pipelines is solved. Of course, as the second and third lines L2 and L3 are configured in a closed loop as in the above configuration together with the heat pump unit 20, the outside of the closed loop (the first line L1 and the fourth line L4) )), ethanol or brine is not circulated, so even if the heat source unit 10 and the first and second intermediate heat exchangers 40 and 50 are damaged and malfunctions, ethanol or brine is not circulated. Since it does not leak to the outside, environmental pollution can be prevented in advance.

Accordingly, in the present invention, in order to selectively use the fifth and sixth lines (L5, L6) using water as a refrigerant and the second and third lines (L2, L3) using ethanol or brine as the refrigerant, the following and The same temperature sensor 60 and control unit 61 are configured.

The temperature sensor 60 is installed in the fifth line (L5) and the sixth line (L6), respectively, because water is used as a refrigerant, so there may be a risk of freezing in winter, but it can be used with good efficiency outside of winter.

The control unit 61 controls any one of the above-described fifth and sixth lines L5 and L6 or the second and third lines L2 and L3 to be opened and used, and the fifth and sixth lines L5, L5, While using L6), the temperature value measured in the fifth line (L5) or the sixth line (L6) through the temperature sensor 60 is converted to the refrigerant in the fifth and sixth lines (L5, L6). When the used water falls within the preset temperature range for freezing, the fifth and sixth lines (L5, L6) turn off the on/off valves (V) of the fifth and sixth lines (L5, L6) using the refrigerant as water, respectively. ) is stopped, and the second and third lines (L2, L2, L3) is used to prevent damage or failure of equipment and pipelines by freezing the refrigerant (A) of the fifth and sixth lines (L5, L6).

Of course, for this purpose, the control unit 61 is electrically connected to the temperature sensor 60 installed in the fifth and sixth lines L5 and L6, and the first and third branches in the first and second branch lines a and b. Control the on/off valve (V) of each pipe installed in the pipe branching to the heat exchangers 23 and 26 and the second and fourth heat exchangers 25 and 27, or in the first branch line (a), the first, Controls the on/off of the three-way valve (3V) installed in the part branching to the three heat exchangers (23, 26) and the part branching from the second branch line (b) to the second and fourth heat exchangers (25, 27) Thus, the refrigerant of the heat pump unit 20 flows into one of the first and third heat exchangers 23 and 26, or the refrigerant of the heat pump unit 20 flows into one of the second and fourth heat exchangers 25 and 27. It would be natural to have to be controlled to flow.

(In other words, through the temperature sensor 60 installed in the fifth and sixth lines (L5, L6), when the temperature of the preset range at which the refrigerant water is frozen, the temperature sensor 60 controls the controller 61 transmits a signal to and receives the signal, the control unit 61 turns OFF the on/off valves installed on the fifth and sixth lines (L5, L6), and at the same time, the second and third refrigerants using ethanol or brine In order to use the lines (L2, L3) instead, the on/off valves (V) respectively installed in the second and third lines (L2, L3) are operated ON.

Accordingly, compared to the case of using only water as the refrigerant between all equipment in the prior art, it is possible to prevent a freeze accident from occurring in the winter season, and, conversely, only ethanol or brine is used as the refrigerant so that the refrigerant flows through the entire pipeline. Compared to the case of the configuration, the refrigerant leaks to the outside due to the occurrence of equipment damage, causing environmental pollution, or the problem of having to repair or replace the entire equipment.)

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and changes are possible within the scope of equivalents of the claims to be described.

10: heat source part 11: underground heat exchanger
20: heat pump unit 21: compressor
22: four-way valve 23: first heat exchanger
24: expansion valve 25: second heat exchanger
26: third heat exchanger 27: fourth heat exchanger
30: place of use 40: first intermediate heat exchanger
50: second intermediate heat exchanger 60: temperature sensor
61: control unit 70: measuring means
71: additional supply unit
a: 1st branch line b: 2nd branch line
A: Refrigerant B: Second Refrigerant
L1: first line L2: second line
L3: 3rd line L4: 4th line
L5: 5th line L6: 6th line
V: on/off valve 3V: three-way valve

Claims (6)

a heat source unit 10 in which a geothermal heat source is used through a geothermal heat exchanger 11;
A compressor (21) for condensing the refrigerant (C), a first heat exchanger (23) serving as a condenser of the refrigerant, an expansion valve (24) lowering the pressure of the refrigerant, and a second heat exchanger (25) serving as an evaporator of the refrigerant a heat pump unit 20 made of;
Installed between the heat source unit 10 and the heat pump unit 20 , water is used as a refrigerant in the first line L1 connected to the heat source unit 10 , and the second line connected to the heat pump unit 20 . In the line (L2), the first intermediate heat exchanger 40 in which the second refrigerant (B) of ethanol is used;
The second refrigerant (B) of ethanol is used in the third line (L3) connected to the heat pump unit 20 and installed between the heat pump unit 20 and the place of use (30), and the second refrigerant (B) connected to the place of use (30) is used. In line 4 (L4), a second intermediate heat exchanger 50 in which water is used as a refrigerant; consists of,
The second refrigerant (B) is used only in the second and third lines (L2, L3) and has a closed loop shape with the heat pump unit 20 , and the refrigerant (C) of the heat pump unit 20 is transferred to the heat source unit 10 ) and the place of use 30 are not used for direct heat exchange, so that environmental pollution caused by ethanol leakage to the outside in case of damage or failure can be prevented in advance.
In each of the second and third lines L2 and L3,
measuring means 70 for detecting a part of the flowing ethanol mixture and measuring whether the mixing ratio of ethanol and water falls within a preset mixing ratio range;
An additional supply unit for supplying ethanol or water to the second and third lines (L2, L3) according to the measurement value received from the measuring means 70 so that the ethanol and water of the ethanol mixture fall within a preset mixing ratio range (71); includes,
When ethanol is used as the second refrigerant (B), ethanol is mixed with water and used as an ethanol mixture, and 10 to 15% of ethanol is mixed with water to prevent freezing to -6°C,
The underground heat exchanger 11 is an open type underground heat exchanger or a vertically sealed type underground heat exchanger is used,
The heat pump unit 20 is
The third heat exchanger 26 is directly connected to the fourth line L4 without going through the second intermediate heat exchanger 50 and has a sixth line L6 in which water is used as a refrigerant, and serves as a condenser of the refrigerant. );
A fourth heat exchanger (27) connected to the first line (L1) without going through the first intermediate heat exchanger (40) and provided with a fifth line (L5) in which water is used as a refrigerant, and serving as an evaporator of the refrigerant (27) ; to include more
a temperature sensor 60 installed on the fifth and sixth lines L5 and L6, respectively;
Depending on whether the first and second intermediate heat exchangers 40 and 50 are used, whether or not the fifth and sixth lines (L5, L6) are used is controlled,
When the fifth and sixth lines (L5, L6) are used, the temperature value measured in the fifth line (L5) or the sixth line (L6) through the temperature sensor 60 is a preset temperature at which water freezes If it falls within the range, the second and third lines (L2, L3) using the second refrigerant (B) of ethanol are turned off through the on/off valves of the fifth and sixth lines (L5, L6). By driving the on-off valve to ON, the control unit 61 to prevent damage and failure of equipment due to freezing of the fifth and sixth lines (L5, L6) in which water is used as a refrigerant; A geothermal heat source heat pump system having an ethanol intermediate heat exchanger, characterized in that it is provided.
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