US 7,621,320 B2 · Internal heat exchanger

Abstract

In an internal heat exchanger, when a corresponding diameter of a high pressure passage 5a is Ψh, a passage length Lh of the high pressure passage (5a) is so set as to satisfy the relation 9.16/{LN(4.5−Ψh+1.03)}<Lh<46/{LN(4.5−Ψh+1.03)}, and when a corresponding diameter of a low pressure passage 5c is Ψl, a passage length Ll of the low pressure passage 5c is so set as to satisfy the relation 9.16/{LN(0.56×6−Ψl+1.02)}<Ll<46/{LN(0.56×6−Ψl+1.02)}, a passage sectional area Ah of the high pressure passage 5a is so set as to satisfy the relation 100×(0.25×Ψh1.2)−1/(0.04×Ψh+1.7)≧Ah≧100×(500×Ψh1.2)−1(0.04×Ψh+1.7), and a passage sectional area Al of the low pressure passage 5c is so set as to satisfy the relation 1.65/Ψl0.67<Al<626/Ψl0.67.

Claims7

Dependent claims

An internal heat exchanger applied to a vapor compression type refrigerator using carbon dioxide as a refrigerant, having a high pressure passage (5a) through which a high pressure refrigerant flows and a low pressure passage (5c) through which a low pressure side refrigerant flows, and conducting heat exchange between said high pressure side refrigerant and said low pressure side refrigerant while the flow of said high pressure side refrigerant and the flow of said low pressure side refrigerant constitute counter-flows, wherein:

when the length units are millimeters and a corresponding diameter of said high pressure passage (5a) is Ψh, a passage length (Lh) of said high pressure passage (5a) is greater than 9.16/{LN(4.5−Ψh+1.03)} and smaller than 46/{LN(4.5−Ψh+1.03)}, and when a length unit is millimeter and a corresponding diameter of said low pressure passage (5c) is Ψl, a passage length (Ll) of said low pressure passage (5c) is greater than 9.16/{LN(0.56×6−Ψl+1.02)} and smaller than 46/{LN(0.56×6−Ψl+1.02)}.

Dependencies are inferred from the claim text.

Internal heat exchanger

Life of this patent

Internal heat exchanger

Life of this patent

Abstract

Claims7