To solve problems such that refrigerant flow velocity in a high-temperature part is increased in a conventional configuration of double pipe type heat exchanger to make it difficult to apply an internally-grooved pipe that further enhances refrigerant pressure loss, and the internally-grooved pipe also cannot exert its primary effect due to inflow of lubricating oil of a compressor to the groove portion.
The double pipe type heat exchanger 1 has a plurality of heat exchange units 6 in which a double pipe 5 for performing heat exchange between a fluid flowing in the inside of an inner tube 13 and a fluid flowing between the outside of the inner tube 13 and the inside of an outer tube 11 is constituted in a spiral shape, and the pass number of a downstream double pipe 5b is set smaller than the pass number of an upstream double pipe 5a across an intermediate header 3 mutually joining the heat exchange units 6. According to this, the refrigerant flow velocity on the downstream side is increased to thereby peel the oil from the groove of the internally-grooved tube, whereby a heat transfer promoting effect due to increase in heat transfer area of the internally-grooved tube can be brought out to improve the performance of the heat exchanger.
MACHIDA KAZUHIKO
AOYANAGI OSAMU
ANDO TOMOAKI
| JP2005147566A | 2005-06-09 | |||
| JP2008185297A | 2008-08-14 | |||
| JP2009168383A | 2009-07-30 | |||
| JP2006170571A | 2006-06-29 | |||
| JP2010210137A | 2010-09-24 | |||
| JP5548957B2 | 2014-07-16 |
Daisuke Nagano
Kentaro Fujii
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