Heat transfer tubes and a heat exchanger using the same

Abstract

Provided is heat transfer tubes and a heat exchanger using the same. In the compact heat exchanger, outer tubes and inner tubes can be assembled in an accurate manner without causing reduction in heat transfer efficiency. The heat transfer tubes comprise: a plurality of parallel outer tubes (13); inner tubes (15) inserted into the outer tubes (13) and disposed so that both ends of the inner tubes (15) extend beyond the outer tubes (13); a gap support member (17) disposed in the gap between the inner circumferential surface of the outer tube (13) and the outer circumferential surface of the inner tube (15), the gap support member (17) being made of a wire material arranged so as to be in contact with the inner circumferential surface and the outer circumferential surface in a spiral shape along substantially the entire length of the outer tube (13); and a support member (19) made of a wire material arranged so as to be in contact with the inner circumferential surface of the inner tube (15) in a spiral shape along the entire length of the inner tube (15). The area ratio of a primary flow path in the inner tubes (15) and a secondary flow path in the outer tubes (13) is 1:1-1:1.6.

Description

technical field [0001] The invention relates to a heat transfer tube and a heat exchanger using the heat transfer tube. Background technique [0002] As a multi-pipe heat exchanger, there is a double pipe heat exchanger in which an inner pipe is inserted into an outer pipe, and the fluid flowing through the inner pipe and the fluid flowing between the inner pipe and the outer pipe Heat exchange between fluids. This heat exchanger is suitable for heat pump water heaters or heating equipment using refrigerants, and flows high-temperature and high-pressure refrigerants through inner pipes, and heats water flowing between inner pipes and outer pipes to supply hot water. [0003] In this double tube heat exchanger, in order to obtain a predetermined hot water supply capacity, the heat transfer area is increased and the double tube is configured as a long strip. Therefore, in order to be embedded in a device, it is necessary to perform bending processing or coiling to form a pre...

AI Technical Summary

Problems solved by technology

Therefore, in order to be embedded in a device, it must be bent or coiled to form a predetermined external shape, making it difficult to compact

In addition, as the overall length increases, the pressure loss of the fluid (refrigerant, water) also increases, so it is necessary to use a large-diameter pipe body, and it is impossible to use a small-diameter pipe that is excellent in pressure resistance for high-pressure refrigerants.

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