| 摘要 |
A multi-flow type heat exchanger includes a pair of headers and a plurality of heat transfer tubes interconnecting the headers. The flow direction of the heat exchange medium through the whole of the heat transfer tubes is only one direction. A flow division parameter gamma is defined as a ratio of a resistance parameter beta of the heat transfer tubes to a resistance parameter alpha of an entrance side header and is set to at least about 0.5. The flow division parameter is calculated, such that gamma=beta/alpha, where beta=Lt/(Dt.n), and alpha=Lh/Dh. The equation variables are defined as follows: Lt equals a length of each tube, Dt equals a hydraulic diameter of one tube, n equals a number of tubes, Lh equals a length of an entrance side header, and Dh equals a hydraulic diameter of the header. The flow division from the header to the tubes may be chosen at an optimum condition, and the heat exchanger may have superior performance.
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