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Energy and Environment, 1995

ISBN:
1-56700-052-5 (Print)

FLOW VISUALIZATION AND PRESSURE DROPS OF DIFFERENT HEAT TRANSFER PLATES FOR BPU INDIRECT EVAPORATIVE AIR COOLERS

LiangShi Ding
Institute of Environmental & Energy Source Engineering Beijing Polytechnic University Beijing 100022, RR. China

Xun Wang
Beijing Polytechnic University; Institute of Engineering Thermophysics, Chinese Academy of Sciences Beijing 100080,China

MingJian Jiang
Beijing Polytechnic University, China

Abstract

The preliminary experimental results on the fluid-flow patterns and pressure drops in channels of the Indirect Evaporative Air Coolers formed by different types of plastic plates with protrusions of cone and semi-sphere were reported. Flow visualization was performed by an improved tracer-injection technique. Cold water was used instead of air as the working fluid. The Critical Reynolds Numbers for fluid between two types plastic plates are 400 to 600 and 800. A set of empirical correlations of Eu-Re were obtained. It is important for the advanced design of the plastic plate heat Exchangers and Causes large Energy Saving.