Patent ID: 6189604
Filing Date: 2001-02-20
Classification: B60H,F25B,F28D,F28F

Abstract:
A heat exchanger for an inside/outside air two-passage unit having a first air passage and a second air passage, in which inside air and outside air flow separately, the heat exchanger comprising:a first core portion disposed in the first air passage, for exchanging heat between thermal medium flowing therein and the inside air flowing in the first air passage, the first core portion having a first part and a second part communicating with the first part and disposed at a downstream side of the first part in the thermal medium flow direction, and at an upstream side of the first part in an inside air flow direction in which the inside air flows, the first core portion having a first group of tubes forming the first part in which the thermal medium flows in a first direction, and a second group of tubes forming the second part in which the thermal medium flows in a second direction opposite to the first direction, the first and second directions being approximately perpendicular to the inside air flow direction;a second core portion disposed in the second air passage, for exchanging heat between the thermal medium flowing therein and the outside air flowing in the second air passage, the second core portion being disposed at a downstream side of the first core portion in a thermal medium flow direction in which the thermal medium flows, the second core portion having a third part and a fourth part communicating with the third part and disposed at a downstream side of the third part in the thermal medium flow direction and at an upstream side of the third part in an outside air flow direction in which the outside air flows, the second core portion having a third group of tubes forming the third part in which the thermal medium flows in a third direction, and a fourth group of tubes forming the fourth part in which the thermal medium flows in a fourth direction opposite to the third direction, the third and fourth directions being approximately perpendicular to the outside air flow direction;a downstream side header connected to an end of the first group of tubes and to an end of the third group of tubes, the downstream side header defining therein a first inlet chamber communicating with the first group of tubes for conducting the thermal medium into the first group of tubes, and a second inlet chamber communicating with the third group of tubes for conducting the thermal medium into the third group of tubes; andan upstream side header connected to an end of the second group of tubes and to an end of the fourth group of tubes, the upstream side header defining therein a first outlet chamber communicating with the second group of tubes for receiving the thermal medium discharged from the second group of tubes, and a second outlet chamber communicating with the fourth group of tubes for receiving the thermal medium discharged from the fourth group of tubes.