FINNED HEAT EXCHANGER

摘要

PROBLEM TO BE SOLVED: To obtain a finned heat exchanger exhibiting high performance in both the condenser and the evaporator of a refrigeration cycle by suppressing increase of heat transfer area and pressure loss in the heating tube on the gas inlet side. SOLUTION: The finned heat exchanger comprises an auxiliary heat exchanger 11a and a main heat exchanger 11b juxtaposed from the gas inlet side to the gas outlet side. The row of heating tube group 13a on the gas inlet side is separated from a plurality of rows of heating tube group 13b on the gas outlet side. Step pitch P1 of the heating tube group on the gas inlet side is set smaller than the step pitch P2 of the heating tube group on the gas outlet side and the number of heating tubes in a row is set lower on the gas inlet side than on the gas outlet side. Since increase in the heat transfer area and the pressure loss is suppressed in the heating tube on the gas inlet side, a high performance auxiliary heat exchanger is realized.