Condenser

a condenser and condenser technology, applied in the field of condensers, can solve the problems of increased refrigerant flow resistance, inefficient refrigerant blow-up effect, and deterioration of refrigeration performan

Inactive Publication Date: 2002-01-24
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since those portions through which only the liquefied refrigerant RL flows cannot perform efficient heat exchanging, an effective heat transfer area decreases, which causes deterioration in the refrigeration performance.
Furthermore, the liquefied refrigerant RL impedes the refrigerant circulation, resulting in an increased refrigerant flow resistance.
If the aforementioned reduction rate is smaller than 20%, an enough flow velocity (vigor) of the refrigerant cannot fully be secured in the refrigerant turning portion T1 and T2 in the header 11 between the adjacent paths, resulting in an inefficient refrigerant blow-up effect, which in turn may cause a liquefied refrigerant stagnation.
If the total number of paths is set too much, the reduction rate of the cross-sectional areas between adjacent paths, i.e., the reduction rate of the tube number between the adjacent paths in the aforementioned embodiment, becomes too small, which causes a trouble in securing the aforementioned reduction rate.
Thus, an effective refrigerant blow-up effect may not be obtained.

Method used

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Examples

Experimental program
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second example

[0048] As shown in FIG. 4, a condenser having three paths, i.e., the lowermost first path P1, the middle second path P2 and the uppermost third path P3, was manufactured. The first, second and third paths P1, P2 and P3 include eighteen (1a) tubes, nine (9) tubes and five (5) tubes, respectively. Another structure is the same as the condenser of the first example. In this condenser, the reduction rate of the cross-sectional area of the second path P2 to that of the first path P1 is 50%, and the reduction rate of the cross-sectional area of the third path P3 to that of the second path P2 is 44.4%

[0049] In the second embodiment shown in FIG. 4, the same or corresponding reference numeral as in the first example are allotted to the same portion or corresponding portion (Similarly, the same or corresponding reference numeral will be allotted in the following third example shown in FIG. 5 and the following comparative example shown in FIG. 6).

third example

[0050] As shown in FIG. 5, a condenser having four paths, i.e., the lowermost first path P1, the lower middle second path P2, the upper middle third path P3 and the uppermost fourth path P4, was manufactured. The first, second, third and fourth paths P1, P2, P3 and P4 include thirteen (13) tubes, nine (9) tubes, six (6) tubes and four (4) tubes, respectively. Another structure is the same as the condenser of the first example. In this condenser, the reduction rate of the cross-sectional area of the second path P2 to that of the first path P1 is 30.8%, the reduction rate of the cross-sectional area of the third path P3 to that of the second path P2 is 33.3% and the reduction rate of the cross-sectional area of the fourth path P4 to that of the third path P3 is 33.3%. In FIG. 5, the reference numeral T4 denotes a fourth refrigerant turning portion (the same numeral will be used in FIG. 6)

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Abstract

A condenser includes a pair of headers 11 and a plurality of heat exchanging tubes 12 disposed between the headers 11 with their opposite ends connected to the headers 11. The plurality of heat exchanging tubes 12 are grouped into three paths P1-P3 by partitions 16. A refrigerant introduced from a refrigerant inlet 11a provided at the lower portion of one of headers passes upwardly through the paths P1-P3 in sequence, and flows out of a refrigerant outlet 11b provided at an upper portion of one of headers. The cross-sectional area of each path decreases stepwise towards a downstream side path, and the reduction rate of the cross-sectional are of the downstream side path of the adjacent two paths to the cross-sectional area of the upstream side path thereof is set to 20%. Thereby, the cooling performance can be achieved.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a condenser suitably used for, for example, a refrigeration system for car air-conditioners.[0003] 2. Description of Related Art[0004] As shown in FIG. 8, a conventional multi-flow type condenser for use in car air-conditioners includes a pair of vertical headers 1 and 1 disposed apart from each other and a plurality of horizontal flat tubes 2 as heat exchanging tubes disposed between the headers at certain intervals in the direction of up-and-down with their opposite ends connected with the headers. One of the headers 1 is provided with a refrigerant inlet 1a at the upper end portion thereof, and the other header 1 is provided with a refrigerant outlet 1b at the lower portion thereof. Furthermore, the headers 1 are provided with partitions 5 each disposed at a predetermined portion for dividing the inside of the header to thereby group the aforementioned plurality of flat tubes 2 into a plurality of paths P1 to...

Claims

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Application Information

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IPC IPC(8): F25B39/04F28D1/053F28F9/02
CPCF25B39/04F25B2500/01F28D1/05375F28D2021/0084F28F9/0212
InventorMANAKA, HIDEAKI
OwnerSHOWA DENKO KK