| 摘要 |
PROBLEM TO BE SOLVED: To obtain a simple structure and prevent heat exchange capacity from being deteriorated by providing a pipeline for allowing a high pressure high temperature refrigerant to flow outside of the pipeline for allowing a low pressure low temperature refrigerant to flow in such a manner as to surround them so as to perform heat exchange. SOLUTION: An internal heat exchanger 40 has a linear large diameter pipe 41 and a linear intermediate diameter pipe 42 concentrically arranged in the large diameter pipe. Therefore, an annular columnar space 43 is formed between the large diameter pipe 41 and the intermediate diameter pipe 42. In the space 43 a plurality of linear small diameter pipes 44 are disposed along an axial direction thereof at an equal interval in a peripheral direction. Further, part of the space 43 that is not occupied by the small diameter pipes is filled with a material having a high thermal conductivity, e.g. member 43a made of aluminum alloy over a length of the small diameter pipe 44 in its axial direction. By this constitution, heat exchange efficiency of the internal heat exchanger can be raised so that cooling capacity of an evaporator is raised and coefficient of performance of a refrigeration air conditioning apparatus is enhanced.
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