Heat exchanger in automobile cooling and heating unit

Abstract

Abstract PURPOSE:To provide a heat exchanger capable of being used for space cooling and space heating without lowering of its performance by separately forming two kinds of heat medium passages in tubes, passing a heat medium radiating heat through one of the passages and also passing an endothermic medium through the other, conducting heat-exchanging between these heat media and the outside air through fins, and conducting heat-exchanging between these mediums through a partitioning wall. CONSTITUTION:The heat exchanger 1 is formed in such a manner that a coolant passage 2 and a fluid passage 3 are formed within flat tubes 4 in a lateral direction in parallel by holding therebetween partitioning walls. In the coolant passage 2 is provided an inner wall 6 and in the fluid passage 3 is provided an inner wall 7. Both passages are respectively divided into a plurality of parts. The inner wall 6 of the coolant passage 2 is formed into a cross shape to facilitates the transfer of heat between the coolant and a working fluid of the fluid passage 3 and to increases the pressure resistance of the tubes 4. Such tubes 4 are made in zigzag manner and a large number of metal fins 8 are provided only at the portions of the coolant passage 2 so that the outside air passes in the width direction between the tubes 4. The space cooling and heating apparatus using the present heat exchanger can be switched over between the space cooling and the space heating by only opening and closing valves.

Inventors

• 👤 Susumu Saito
• 👤 進 斉藤

Bibliographic Details