JP2005077088A - Condensation machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a proper ratio of a supercooled liquid area capable of increasing a two-phase area having excellent heat transfer, and capable of enhancing a cooling capacity and a performance index, in a passage for heat-exchanging a gaseous refrigerant introduced into a condenser. <P>SOLUTION: In this condenser where the refrigerant introduced from a compressor coexists under a superheated vapor condition, a two-phase condition and a supercooled liquid condition, the plurality of refrigerant passages in at least one of a superheated vapor area and the two-phase area is coupled to be connected to the supercooled liquid area formed in a rear end of the two-phase area. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a condenser, and in particular, when a refrigerant introduced from a compressor coexists in a superheated steam state, a two-phase state, and a supercooled liquid state, at least one of a superheated steam region and a two-phase region. It is related with the condenser which couple | bonds the several refrigerant | coolant path | route in and outputs a refrigerant | coolant to a supercooled liquid area | region, and provides the ratio of a suitable supercooled liquid area | region.

  In general, the compression refrigeration cycle is completed by the compressor 5, the condenser 1, the expansion valve 3, and the evaporator 4. Recently, however, the power consumption of the air conditioner and the like forming this cycle has been reduced to the maximum. More attention is being paid to the requirements that must be made.

  Accordingly, various efforts have been promoted, including performance improvements for each of the major components that make up such a compression refrigeration cycle.

  FIG. 1 is a drawing showing a main engine of a general compression refrigeration cycle.

  Referring to the drawings, in general, an air conditioner or the like exhibits its performance by cold air generated by a compression refrigeration cycle.

  More specifically, the compressor 5 converts low-temperature low-pressure gas refrigerant into high-temperature high-pressure gas refrigerant, the condenser 1 converts the high-temperature high-pressure gas refrigerant into medium-temperature high-pressure liquid refrigerant, and the medium-temperature high-pressure liquid refrigerant. The refrigeration cycle is completed by the expansion valve 3 that converts the low-temperature and low-pressure liquid refrigerant into the low-temperature and low-pressure liquid refrigerant and the evaporator 4 that converts the low-temperature and low-pressure liquid refrigerant into the low-temperature and low-pressure gas refrigerant.

  The condenser 1 is provided with a cooling fan 2 to supply outside air.

  Here, the condenser 1 that has been supplied with the high-temperature and high-pressure gas refrigerant from the compressor 5 again converts it into a medium-temperature and high-pressure liquid refrigerant and sends it to the expansion valve 3.

  At this time, in the condenser 1, the state of the working fluid changes in the order of the vapor state and the two-phase state.

  In the case of the vapor state or the two-phase state, the pressure drop is much larger than that in the liquid state, so that many branch paths are provided to reduce the pressure drop.

  Generally, if the same mass flows, the volume of the gas is about 1000 times that of the liquid, and thus the flow rate of the gas is also about 1000 times. In this case, a pressure drop occurs and the compressor 5 Since you have to do more work, branch the tube to avoid this.

  More specifically, in the case of a vapor or two-phase liquid, the flow rate is higher than that of the liquid, so that it is divided into many tubes rather than continuously flowing through a single tube. It is advantageous to flow through the branched tube.

  Since the flow rate is dispersed, the pressure drop is reduced accordingly. That is, the pressure drop when the flow rate is low is smaller than when the flow rate is high.

  Also, the fluid flows through multiple branch tubes that are shorter than a single tube and has the same flow rate, so that the pressure drop is reduced.

  The meaning that the pressure drop is reduced means that the work of the compressor is reduced accordingly, so that the power consumption of the compressor is reduced.

  On the other hand, in the case of a liquid, the flow rate is slow and the heat transfer rate is only 1/10 of that in the two-phase state, so there is no need to branch and flow.

  That is, the more the liquid region, the smaller the two-phase region having a good heat transfer rate. Thus, the determined heat exchanger size is more damaged.

  Therefore, to overcome this, it is sufficient to collect enough liquid and run a shorter tube. That is, the tubes are branched or joined. The purpose of this is a supercooled tube.

  Looking at the performance index here, the performance index (COP) is generally a value obtained by dividing the cooling capacity or heating capacity value by the power consumption used. If you are going to get grade certification, the figure of merit should keep at least 3.54.

  Here, in order to improve the above-mentioned performance index, in addition to improving the performance of each of the main components forming the compression refrigeration cycle, the compression is reduced by reducing the pressure difference by lowering the condensation pressure instead of increasing the evaporation pressure. It has been proposed to reduce the work of the machine 5, but this has certain limits.

  FIG. 2 is a diagram illustrating that the refrigerant is introduced into the condenser and output through the superheated steam region, the two-phase region, and the supercooled liquid region.

  As can be seen in the drawing, the refrigerant branched and flowing into the superheated steam region is output through the respective supercooled liquid regions in a state of branching through the respective two-phase regions.

  Therefore, as described above, in the liquid in the supercooled liquid region, the flow rate is slow and the heat transfer rate is only 1/10 compared to the two-phase region, so there is no need to branch and flow. Since the liquid region increases due to the output through each tube and the two-phase region with good heat conductivity decreases, the performance degradation and power consumption are reduced at the determined heat exchanger size. Become more.

  The object of the present invention is to increase the two-phase region having good heat transfer in the passage for exchanging the gas refrigerant introduced into the condenser, and improve the cooling capacity and the performance index. It is to provide an appropriate ratio.

  Another object of the present invention is to combine a plurality of refrigerant paths of refrigerant output from the two-phase region and extend to the supercooled liquid region.

  Still another object of the present invention is to allow the cooling capacity of an air conditioner or the like to be increased by further providing a supercooled liquid region in a condenser that performs a compression refrigeration cycle.

  The present invention provides an apparatus having a compressor and a condenser in which a refrigerant introduced from the compressor coexists in a superheated steam state, a two-phase state, and a supercooled liquid state, and includes at least a superheated steam region and a two-phase region. There is provided a condenser that combines a plurality of refrigerant paths in one and extends to a supercooled liquid region formed at a rear end of the two-phase region.

  Moreover, in one embodiment of this invention, the length of the supercooled liquid area | region of a condenser is a ratio range of 7%-20% of the length of all the refrigerant paths.

  Since the refrigerant is output to the supercooled liquid region via the combined refrigerant path, the two-phase region having substantially good heat transfer efficiency is increased, and the supercooled liquid region is provided by providing an appropriate ratio. Thus, the air conditioner performance and power consumption can be substantially improved.

  Hereinafter, preferred embodiments of a condenser according to the present invention will be described with reference to the accompanying drawings.

  FIG. 3 is a block diagram schematically showing a structure having a condenser according to the present invention, and FIGS. 4A and 4B show the state of the refrigerant in the condenser and the path and region through which the refrigerant passes. FIG. 5 is a graph and chart showing the relationship between the supercooled liquid tube ratio and the figure of merit.

  First, FIG. 3 will be described.

  The refrigerant output from the indoor unit (not shown) is branched into one or more refrigerant paths via the service valve and the discharge valve of the compressor, and input to the condenser 1.

  The branched refrigerant path of the present invention is coupled in the supercooled liquid region via the superheated steam region tube and the two-phase region tube.

  In addition, when the proper area ratio of the supercooled liquid area tube is 7 to 20% of the total tube length, the performance index and the power consumption efficiency of the air conditioner are maximized.

  In the condenser 1 according to the present invention, the state of the working fluid changes in the order of vapor, two-phase, and liquid.

  And in the case of liquids, the pressure drop is relatively low compared to vapor and two-phase, and there is no need to branch the liquid to reduce the pressure drop.

  In general, if the same mass flows, the liquid has a volume of about 1/1000 compared to the gas, and therefore the liquid flow rate is only about 1/1000, so the liquid does not have to branch. .

  4A and 4B show that in the present invention, the refrigerant is introduced into the condenser through a plurality of paths (two paths or three paths) and is output through the superheated steam region, the two-phase region, and the supercooled liquid region. FIG.

  As seen in the drawing, the refrigerant that is branched and flows into the superheated steam region flows into the supercooled liquid region of the combined refrigerant path through the respective two-phase regions and is output to the expansion valve. .

  When the appropriate area ratio of the supercooled liquid area tube is 7 to 20% of the total tube length, the performance index and power consumption efficiency of the air conditioner are maximized.

  5A and 5B are graphs and charts showing the relationship between the supercooled liquid tube ratio and the figure of merit.

  In FIG. 3, the number of the total tubes in the condenser 1 is 26 rows and two rows, and if the relationship between the ratio of the respective supercooled liquid tubes to the total tubes and the figure of merit is determined by experiment, When the tube is in two stages (the ratio of the supercooled liquid tube to the total tube at this time is 7%), the power consumption used is 569 W and the cooling capacity is measured as 2692 W. It can be seen that the figure of merit is 4.73.

  And when the supercooled liquid tube is made up of four stages (the ratio of the supercooled liquid tube to the total tube at this time is 15%), the power consumption used is 567 W, and the cooling capacity is measured as 2745 W. The figure of merit at this time slightly increases to 4.84. When the supercooled liquid tube has 6 stages (the ratio of the supercooled liquid tube to the total tube at this time is 23%), the power consumption used is 586 W, and the cooling capacity is measured as 2726 W. The figure of merit at this time decreases again to 4.65.

  As described above, it can be seen that the optimum figure of merit can be obtained when the ratio of the supercooled liquid tubes installed in the condenser is in the range of 7% to 20% of the tubes in the whole condenser.

  As described above, the present invention provides a structure in which the refrigerant paths output in the two-phase region are combined and output to the supercooled liquid region, and an appropriate ratio of the supercooled liquid region, thereby providing the two-phase region The heat transfer efficiency, the figure of merit and the power consumption can be improved.

  Although the preferred embodiments of the present invention have been described above, various changes, modifications, and equivalents may be used for the present invention. In the present invention, it is clear that the above-described embodiment can be appropriately modified and applied in the same way.

  For example, the present invention can be applied to a refrigerator that performs a condensing action and other products that perform similar functions.

  Accordingly, the scope of the present invention is not limited by the limitations of the claims.

  The present invention is applicable to industrial fields such as air conditioners and refrigerators using refrigerants.

It is drawing which shows the main engines of a general compression refrigeration cycle. 6 is a diagram illustrating that a refrigerant is introduced into a condenser and output through a superheated steam region, a two-phase region, and a supercooled liquid region. It is the block diagram which showed roughly the structure which has the condenser by this invention. It is drawing which showed the refrigerant | coolant state in a condenser in the case of a two path | route, and the path | route and area | region where a refrigerant | coolant passes. It is drawing which showed the refrigerant | coolant state in a condenser in the case of a three path | route, and the path | route and area | region where a refrigerant | coolant passes. It is the graph which showed the relationship between the ratio of a supercooling tube, a figure of merit, etc. It is the graph which showed the relationship between the ratio of a supercooling tube, a figure of merit, etc.

Explanation of symbols

1 Condenser 3 Expansion Valve 4 Evaporator 5 Compressor

Claims (10)

The refrigerant flowing in from the compressor coexists in a superheated steam state, a two-phase state and a supercooled liquid state,
A condenser characterized in that a plurality of refrigerant paths in at least one of the superheated liquid region and the two-phase region are connected to the supercooled liquid region.   The plurality of refrigerant paths of refrigerant output from the two-phase region are combined and connected to the supercooled liquid region formed at the rear end of the tube in the two-phase region. Condenser.   3. The condenser according to claim 2, wherein a plurality of refrigerant paths of the refrigerant output from the two-phase region are combined and connected to the supercooled liquid region, and the refrigerant path in the two-phase region is increased. .   The condenser according to claim 3, wherein the heat transfer efficiency is increased by increasing the two-phase region.   The refrigerant branching into one or more and flowing into the superheated steam region passes through each of the two-phase regions and flows into the supercooled liquid region of the refrigerant path coupled to one or more, and the temperature and The condenser according to claim 1, wherein the condenser is output to a means for reducing at least one of the pressures.   6. A condenser according to claim 5, wherein the means for reducing at least one of temperature and pressure comprises an expansion valve.   The condenser according to claim 1, wherein the supercooled liquid region has a ratio range of 7% to 23% of a refrigerant path region of the condenser.   The tube in the supercooled liquid region has an appropriate ratio range of 7% to 20% of the total tube length, and thereby, the performance index and the power consumption efficiency are optimized in the air conditioner. The condenser according to claim 7.   The total number of tubes of the condenser is 26 in 2 rows, and when the supercooled liquid region tube is in two stages, the ratio to the total tube is 7%. When the number of tubes is four, the ratio to the whole tube is 15%, and when the number of tubes in the supercooled liquid region is six, the ratio to the whole tube is 23%. The condenser according to claim 7.   The refrigerant path of the refrigerant output from the two-phase region is combined, and the refrigerant can be input to the supercooled liquid region through one or more combined refrigerant paths. Item 4. The condenser according to Item 1.

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