KR20060094751A - Heat exchanger and cooling system using the same - Google Patents

Abstract

A refrigeration system using a heat exchanger and a heat exchanger according to the present invention includes a compressor; A first heat exchanger in which heat exchange of the compressed refrigerant is performed; An expander in which the refrigerant is expanded; A second heat exchanger in which heat exchange of the expanded refrigerant is performed; And a fan blown to the heat exchanger, wherein at least one of the first heat exchanger and the second heat exchanger is divided into a plurality of heat exchangers, and an electrothermal heat exchanger adjacent to the fan among the plurality of heat exchangers is located after far heat. It includes a heat exchanger provided in a pipeline having a smaller diameter than the heat exchanger.

In the case of a system that is variable into a refrigeration system or a heat pump system according to the present invention, even if the system is operated by either system, there is an advantage that the required amount of refrigerant can be operated in the same optimal state, thereby additionally supplementing the refrigerant or There is an advantage that does not need to be removed, there is an advantage that the air conditioning system is operated stably by the overpressure is not generated in the pipeline of the system.

Compressor, expander, first heat exchanger, second heat exchanger

Description

Heat exchanger and cooling system using the same}

1 is a heating performance factor diagram 2 when the system is operated in a heating operation in the case of a general heat exchanger, and a cooling performance factor diagram 1 when the system is operated in a cooling operation.

2 is a block diagram of a refrigeration system according to the present invention.

3 is a change diagram of the coefficient of performance for the amount of refrigerant in the system according to the present invention.

<Explanation of symbols for the main parts of the drawings>

DESCRIPTION OF SYMBOLS 10 Compressor 20 First heat exchanger 21 First electrothermal heat exchanger

22: first after heat exchanger 30: expander 40: second heat exchanger

41: second heat exchanger 42: second heat exchanger

The present invention relates to a heat exchanger, and more particularly to a heat exchanger structure of a refrigeration system. More specifically, by applying the structure of the heat exchanger that is applied simultaneously to the refrigeration system and the heat pump system, the refrigeration system is applied to the heat exchanger and heat exchanger to reduce the operational efficiency of the refrigeration system and the amount of refrigerant used and improve the use efficiency of the system It is about.

The refrigeration system includes a compressor in which the refrigerant is compressed, a condenser in which the refrigerant compressed by the compressor is condensed, an expander in which the refrigerant condensed in the condenser is expanded, and an evaporator in which the refrigerant expanded in the expander is evaporated.

The condenser and the evaporator are heat exchangers to perform heat exchange by the air blown from the outside, by forcibly blowing air to the outside of the small diameter of the pipe forming the heat exchanger, thereby allowing the refrigerant to condense or evaporate.

On the other hand, in a general refrigeration system, the refrigerant flows through the pipeline of the system, and among the components, the refrigerant is mainly collected in the pipeline from the outlet end of the compressor to the inlet end of the expander, centering on the condenser. The reason for this operation is that a large amount of refrigerant compressed by the compressor and forcibly flowed out does not freely pass by the resistance of the expander and collects up to the front end of the inlet end of the expander.

In the case of the air conditioning system reflecting this non-uniform distribution of the refrigerant, a large diameter, for example, a tube of 7 mm is used in the condenser, and a small diameter, for example a tube of 5 mm, is used in the evaporator. As such, in the case of a condenser, a large diameter tube is used so that a large amount of refrigerant is properly collected and flows slowly, and in the case of an evaporator, a small diameter tube is used so that a small amount of refrigerant flows quickly. By using this aspect of the pipeline, the system efficiency of the refrigeration system is increased.

However, when the refrigerant flowing inside the system flows in the forward or reverse direction by the four-way operation, such as when the refrigeration system and the heat pump are used at the same time, the efficiency of the system is reduced.

In detail, in order to design the condenser and evaporator structure to be optimized for the refrigeration system, the condenser uses a large diameter tube and the evaporator uses a small diameter tube, so that a large amount of refrigerant can be collected in the condenser and a small amount in the evaporator. To allow the refrigerant to pass through quickly.

However, when the flow direction of the refrigerant flowing inside the system is reversed and used as a heat pump, the heat exchanger used as the evaporator in the refrigeration system is used as the condenser and the heat exchanger used as the condenser in the refrigeration system is used as the evaporator. do. Therefore, since the internal volume of the heat exchanger used as the condenser in the heat pump is drastically reduced, there is a problem that the internal pressure of the condenser is increased to increase the risk of refrigerant leakage.

In addition, since the internal volume of the condenser is small, the amount of the refrigerant that can be condensed is reduced, thereby reducing the efficiency of the system.

In addition, since the difference between the amount of refrigerant that maximizes the efficiency of the system when operated in a refrigeration system and the amount of refrigerant that maximizes the efficiency of the system when operated by a heat pump is large, In order to achieve system efficiency, a problem arises in that a refrigerant needs to be replenished or extracted. 1 shows a heating performance factor diagram 2 when the system is operated in a heating operation in the case of a conventional heat exchanger, and a cooling performance factor diagram 1 when the system is operated in a cooling operation. Referring to each diagram, it will be clear that there is a difference in the amount of refrigerant to achieve maximum system efficiency.

The present invention is proposed to improve the above problems, when the system is used in a variable refrigeration system or a heat pump system, the heat exchanger to enable the operation in the optimal state even if the system is operated in either system and It is an object to propose a refrigeration system to which a heat exchanger is applied.

In addition, by improving the configuration of the heat exchanger, an object of the present invention is to propose a refrigeration system to which the heat exchanger and the heat exchanger are applied so that the refrigerant system and the heat pump system are operated in an optimal state without changing the amount of the refrigerant.

In addition, an object of the present invention is to propose a refrigerating system to which a heat exchanger and a heat exchanger are prevented from leaking of a refrigerant by preventing overpressure in a pipeline of a system.

The heat exchanger according to the present invention for achieving the above object is divided into a plurality of partial heat exchanger, and compared to the heat exchanger of the heat transfer adjacent to the fan directly contacted by the air blown from the fan, the diameter of the heat exchanger of the heat exchanger farther away from the fan It is characterized by large.

In addition, a refrigeration system to which the heat exchanger of the present invention according to another aspect is applied to a compressor; A first heat exchanger in which heat exchange of the compressed refrigerant is performed; An expander in which the refrigerant is expanded; A second heat exchanger in which heat exchange of the expanded refrigerant is performed; And a fan blown to the heat exchanger, wherein at least one of the first heat exchanger and the second heat exchanger is divided into a plurality of heat exchangers, and an electrothermal heat exchanger adjacent to the fan among the plurality of heat exchangers is located after far heat. It includes a heat exchanger provided in the pipeline having a smaller diameter than the heat exchanger.

Even when a single system is used as a refrigeration system or a heat pump system by a heat exchanger and a refrigeration system to which the heat exchanger is applied, there is an advantage that the system can be operated at maximum efficiency. In addition, there is an advantage that the system can be stably driven by the overpressure is not generated for each configuration.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the following embodiments, and those skilled in the art who understand the spirit of the present invention can easily add, change, delete, and add other embodiments within the scope of the same idea. I would be able to suggest.

2 is a block diagram of a refrigeration system according to the present invention.

2, a compressor 10 in which a refrigerant is compressed, a first heat exchanger 20 in which a refrigerant compressed in the compressor 10 is condensed, and a refrigerant condensed in the first heat exchanger 20 are included. An expander 30 is expanded, and a second heat exchanger 40 through which the refrigerant expanded in the expander 30 is evaporated. In addition, the first heat exchanger 20 performs convective heat exchange by air by the first fan 51, and the second heat exchanger 40 performs convective heat exchange by air by the second fan 52. do.

On the other hand, the first heat exchanger 20 is a first pre-heat exchanger 22 formed in front of the first fan 51 and the rear of the first pre-heat exchanger It is divided into a first post heat exchanger (21). In other words, the air forcedly blown by the first fan 51 is first heat exchanged with the first heat exchanger 22, and then heat exchanged with the first after heat exchanger 21.

In addition, the second heat exchanger 40 is a second heat exchanger 41 formed in front of the second fan 52 and a second after heat exchanger placed behind the second heat exchanger. It is divided into (42). In other words, the air forcedly blown by the second fan 52 is first heat exchanged with the second preheat heat exchanger 41, and then heat exchange is performed with the second post heat exchanger 42.

As a feature of the present invention, the first pre-heat exchanger (22) is characterized in that the diameter of the conduit is smaller than that of the first post-heat exchanger (21). For example, a 5 mm diameter conduit may be used for the first pre-heat exchanger 22, and a 7 mm diameter conduit may be used for the first post heat exchanger 21. Likewise, the second pre-heat exchanger 41 is provided with a smaller diameter of the conduit than the second post-heat exchanger 42. For example, a 5 mm diameter conduit may be used for the second pre-heat exchanger 41, and a 7 mm diameter conduit may be used for the second post heat exchanger 42.

In this way, the preheating heat exchangers 22 and 41 on the side where the air blown from the fans 51 and 52 are first touched are made smaller in diameter than the post heat exchangers 21 and 42, so that Since the resistance to heat is reduced, the performance of convective heat exchange can be improved. In other words, since the pipe diameters of the total heat exchangers 22 and 41 are small, heat exchange can be performed while the air passing therethrough is quickly passed without any resistance, and is also blown to the after heat exchangers 21 and 42. Convective heat exchange can be sufficiently performed since much of the air can be reached.

Hereinafter, the cooling operation operated by the system as the refrigeration system and the heating operation operated by the heat pump system will be described in detail.

First, the case of operating as a refrigeration system will be described. The refrigerant compressed by the compressor (10) first flows into the first after heat exchanger (21) in the state of becoming a high-pressure gas phase refrigerant, and after convection heat exchange is performed by the first after heat exchanger (21), the first The heat exchange is performed by flowing into the total heat exchanger (22).

In more detail, this process, when the refrigerant in the gas phase flows into the first after heat exchanger 21 and the heat exchange is performed, the phase change gradually occurs to the liquid refrigerant. Since the volume of the refrigerant is eventually reduced by this process, the volume of the refrigerant is substantially reduced after the refrigerant is moved to the first heat exchanger (22). Therefore, even if the diameter of the first preheat heat exchanger 22 is smaller than that of the first post heat exchanger 21, the refrigerant pressure inside the conduit is not so high. Therefore, problems such as refrigerant leakage and system instability do not occur.

After condensation by the first heat exchanger 20, it is expanded by the expander 30 and then flows into the second heat exchanger 40. At this time, among the second heat exchanger 40, the first heat exchanger 41 is first introduced into the second heat exchanger 41, and the convection heat exchange is performed, and then the second heat exchanger 42 is introduced to perform heat exchange.

To describe this process in more detail, although the refrigerant expanded by the expander 30 is in a state of wet steam, the volume of the liquid refrigerant is large and the volume is small. Therefore, even if the diameter of the second electrothermal heat exchanger 41 is small, the refrigerant pressure does not increase so much that there is no problem of refrigerant leakage or system instability. After the refrigerant absorbs heat by the second pre-heat exchanger 41 and phase changes to the gas phase to increase volume, the refrigerant flows into the second post-heat exchanger 42 having a larger diameter to prepare for an increase in volume of the refrigerant. To help.

After the evaporation is performed by the second heat exchanger 40, the process of being sucked into the compressor 10 and compressed again is performed again.

Looking again at the operation of the refrigeration system, the heat exchanger 20, 40 is divided into two parts having different diameters, respectively, the heat exchanger having a large diameter is used for the electrothermal heat exchanger of the heat exchanger, the heat exchanger having a small diameter is after heat To be used for the heat exchanger. When the bulky refrigerant in the gas phase flows into the heat exchanger, the large diameter of the gas flows into the post-heat exchanger, and when the small-volume refrigerant flows into the heat exchanger, the diameter of the refrigerant flows into the total heat exchanger.

The refrigerant flows in such a manner as to actively correspond to the volume of the refrigerant flowing through the heat exchanger. In other words, the diameter of the pipe line is divided and arranged in consideration of the volume change of the refrigerant while the phase change occurs inside the pipe line of the heat exchanger, and the arrangement enables the pipe line to be used more efficiently. .

The case where the system of the present invention is used as a heat pump system will be described. However, since many parts are the same as those used as a refrigeration system, only the parts that vary in characteristics will be described in detail.

The refrigerant compressed in the compressor is first introduced into the second heat exchanger 40 to be condensed, introduced into the expander 30, expanded, and introduced into the first heat exchanger 20 to perform an evaporation process. Here, since the refrigerant of the gaseous phase compressed by the compressor 10 first flows into the second large post-heat exchanger 42, the refrigerant of the gaseous phase can appropriately correspond to the gaseous high volume refrigerant. In addition, the liquid low volume refrigerant expanded by the expander 30 is first introduced into the first small heat exchanger 22 having a small diameter, and after the volume is increased, the first large heat exchanger having a large diameter is introduced. Since it flows into (21), it is possible to obtain an advantage that can actively respond to the volume change of the refrigerant.

As such, the diameter of the pipe on the inflow side is actively changed according to the state of the refrigerant flowing into the heat exchanger, so that the optimum amount of refrigerant is irrelevant regardless of whether the system is used as a refrigeration system or a heat pump system. This same effect can be obtained. Therefore, the disadvantage of having to add or remove the amount of refrigerant for each operating state of the system can be eliminated.

In addition, since the heat exchange is performed in an optimal state for each state of the refrigerant, it is possible to obtain an advantage of improving the performance of the heat exchange with respect to the volume of the same heat exchanger.

On the other hand, the described embodiment has been described that two heat exchangers having different diameters of the heat exchanger in the case of both the indoor heat exchanger and the outdoor heat exchanger is used in combination, but is not limited to any one of the heat exchanger Even if the view is to be changed, although the disadvantage of lowering the efficiency, the technical value to be pursued in the present invention will be obtained.

In this regard, the number of cases for the diameter of the heat exchanger obtained in the spirit of the present invention can be summarized as Table 1 below.

Heat exchanger type Selection of the scenery First electric heat exchanger Blind Blind Daekyung Blind Blind First Post Heat Exchanger Daekyung Daekyung Daekyung Blind Daekyung Secondary heat exchanger Blind Daekyung Blind Blind Blind Second post heat exchanger Blind Daekyung Daekyung Daekyung Daekyung

As can be seen from the number of cases described above, various embodiments included in the same idea of the present invention are possible.

3 shows a change diagram of the coefficient of performance with respect to the amount of refrigerant in the system according to the present invention.

Referring to Figure 3, compared with the cooling performance coefficient diagram (1) and heating performance coefficient diagram (2) in the conventional case, according to the cooling performance coefficient diagram (3) and heating performance coefficient diagram (4) according to the present invention several The difference is obvious.

In detail, it can be seen that the amount of the coolant capable of obtaining the maximum coefficient of performance is the same as in the case of cooling or heating, and the state of L1 is reduced as compared with the prior art. Therefore, it is possible to obtain the advantage that the amount of refrigerant required is reduced.

In addition, although the amount of the refrigerant is small, it can be seen that the cooling performance coefficient and the heating performance coefficient were increased by ΔC 1 and ΔC 2, respectively.

 In the case of a system that is variable into a refrigeration system or a heat pump system according to the present invention, even if the system is operated by either system, there is an advantage that the required amount of refrigerant can be operated in the same optimal state, thereby additionally supplementing the refrigerant or There is an advantage that does not need to be removed.

In addition, there is an advantage that the air conditioning system is stably operated by the overpressure is not generated in the pipeline of the system.

In addition, by improving the heat exchange performance of the heat exchanger, it is possible to obtain an advantage that the installation space of the heat exchanger is reduced by that much.

Claims (6)

compressor; A first heat exchanger in which heat exchange of the compressed refrigerant is performed; An expander in which the refrigerant is expanded; A second heat exchanger in which heat exchange of the expanded refrigerant is performed; And A fan is blown to the heat exchanger, At least one of the first heat exchanger and the second heat exchanger is divided into a plurality of heat exchangers, and the heat exchanger adjacent to the fan among the plurality of heat exchangers is provided as a conduit with a smaller pipe diameter than that of the remote after heat exchanger. Refrigeration system in which the machine is used. The method of claim 1, The first heat exchanger is a refrigeration system using a heat exchanger in which the refrigerant flows into the after-heat exchanger, the refrigerant flows out to the pre-heat exchanger. The method of claim 1, The second heat exchanger is a refrigeration system using a heat exchanger in which the refrigerant is introduced into the heat transfer heat exchanger, the refrigerant flows out to the after heat exchanger. The method of claim 1, At least one of the first heat exchanger and the second heat exchanger has the same diameter. A heat exchanger which is divided into a plurality of partial heat exchangers and has a larger diameter of a heat exchanger of a rear heat farther from the fan than a heat exchanger of a heat transfer adjacent to a fan directly contacted by the air blown from the fan. The method of claim 5, wherein And a refrigerant flowing inside the heat exchanger of the previous heat exchanger and the heat exchanger of the subsequent heat flows through one heat exchanger and then flows through the other heat exchanger.

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