| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 94 === The port and manifolds’ design of plate heat exchangers not only affect the pressure drop but also makes the flow uniform or not in all the channels. How to design the port and manifolds is important because it decides the pressure drop performance of the plate heat exchangers.
Reviewed the literature, and we know that almost estimates the port and manifolds pressure drop by Shah and Focke’s correlation in 1988. But the correlation is not reasonable when uses it in a plenty of plates heat exchangers. We can get the correct port and manifolds pressure drop and observe the flow distribution by measuring the pressure drop inside the inlet and outlet ports at different locations for different port dimension. According to the experiment data, looking for a new fit correlation for a plenty of plates heat exchangers.
Experiment results show that the pressure drop increase depends on flow rate, port and manifolds length, port and manifolds diameter, and port and manifolds diameter is major. Types of K050, K070, K095 have a good reasonable port and manifolds design. The percents (port and manifolds pressure drop / total pressure drop) is low, and flow maldistribution is not obvious. However type of K030 diameter is small, it makes over large pressure drop. And the port design brings flow maldistribution is serious.
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