Abstract
This paper presents the heat transfer and pressure drop characteristics of a primary surface heat exchanger (PSHE) with corrugated surfaces. The PSHE was experimentally investigated for a Reynolds number range of 156–921 under various flow conditions on the hot and cold sides. The inlet temperature of the hot side was maintained at 40 °C, while that of the cold side was maintained at 20 °C. A counterflow was used as it has a higher temperature proximity in comparison with a parallel flow. The heat transfer rate and pressure drop were measured for various Reynolds numbers on both the hot and cold sides of the PSHE, with the heat transfer coefficients for both sides computed using a modified Wilson plot method. Based on the results of the experiment, both Nusselt number and friction factor correlations were suggested for a PSHE with corrugated surfaces.
Highlights
a transfer (As) primary surface heat exchanger (PSHE) was manufactured through compression processing of a thin metal surface, resulting in the formation of a heat transfer plate with a corrugated surface.Two such heat transfer plates were stacked and their edges connected by laser welding.This process produced a single cell and was repeated in order to manufacture several cells, the exact number of which is determined by the amount of heat transfer area required, which were stacked
The characteristics heat transfer according to an in and the Reynolds number examined by fixing the of inlet temperature of the hot sideincrease at 40 °C
An experiment was performed on the characteristics of heat transfer and pressure drop with changes in the Reynolds numbers of the hot and cold sides of a PSHE
Summary
A primary surface heat exchanger (PSHE) was manufactured through compression processing of a thin metal surface, resulting in the formation of a heat transfer plate with a corrugated surface.Two such heat transfer plates were stacked and their edges connected by laser welding.This process produced a single cell and was repeated in order to manufacture several cells, the exact number of which is determined by the amount of heat transfer area required, which were stacked. The manufacturing process has a high degree of reliability because of lower thermal resistance for the PSHE and because the location of the welding joints, which join the two heat transfer plates that create a cell, do not block channel flow. As this PSHE structure facilitates both heat exchange across channels, resulting in an increased approach temperature, as well as direct heat exchange, because the thickness of the heat transfer plates is very small at only 0.1 mm, an excellent heat transfer structure can be achieved. Because of these advantages, such a PSHE has applications in various fields, such as fuel cell systems, in heating, ventilation and air conditioning (HVAC) systems and in micro gas turbines
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