A method to reduce the flow depth of a plate heat exchanger without a loss of heat transfer performance
- A method to reduce the flow depth of a plate heat exchanger without a loss of heat transfer performance
- 송귀은; 이주현; 이대영
- plate heat exchanger; scailing rule; compactness; finned channel; Optimum configuration; Flow depth; Scaling rule
- Issue Date
- International journal of heat and mass transfer
- VOL 55, NO 11-12, 2992-2998
- With the aim of improving heat exchanger compactness, this study investigates how the optimum configuration
of an air–liquid plate heat exchanger changes as the heat exchanger depth decreases. In this
respect, optimization of an air–liquid plate heat exchanger with a given frontal area and a given depth
is achieved. The optimum fin pitch and plate pitch are obtained to maximize the heat transfer rate based
on heat transfer and pressure loss correlations in finned channels. Then, the focus of this study is placed
on how the optimum channel configuration changes when the heat exchanger depth decreases for compactness.
The results illustrate that the heat transfer performance can remain unchanged if the geometric
parameters, such as the plate thickness, the plate pitch, the fin thickness, and the fin pitch, are reduced
proportionally to the square root of the flow depth reduction given that the flow remains laminar. This
finding is arranged into a simple scaling rule to obtain the configuration of a more compact heat exchanger
from an existing configuration. In addition, the scaling arguments are extended to practical situations
where the fin thickness and the plate thickness are not properly reduced following the scaling rule due to
limitations on available material thicknesses.
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