| 摘要 |
In an internal heat exchanger, when a corresponding diameter of a high pressure passage 5a is Psih, a passage length Lh of the high pressure passage (5a) is so set as to satisfy the relation 9.16/{LN(4.5-Psih+1.03)}<Lhc is Psil, a passage length Ll of the low pressure passage 5c is so set as to satisfy the relation 9.16/{LN(0.56x6-Psil+1.02)}<Ll<46/{LN(0.56x6-Psil+1.02)}, a passage sectional area Ah of the high pressure passage 5a is so set as to satisfy the relation 100x(0.25xPsih1.2)-1/(0.04xPsih+1.7)>=Ah>=100x(500xPsih1.2)-1(0.04xPsih+1.7), and a passage sectional area Al of the low pressure passage 5c is so set as to satisfy the relation 1.65/Psil0.67<Al<626/Psil0.67.
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