유로 구조 변경을 통한 zigzag 유로를 가진 PCHE의 열수력 성능 향상에 관한 연구
A study on thermal hydraulic performance improvement in a zigzag printed circuit heat exchanger with respect to channel structure
PCHE Thermalhydraulic performance;
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The objective of this study is to propose a new channel shape that can improved the PCHE thermal-hydraulic performance. The existing Zigzag channel has high pressure loss due to flow separation and reverse flow at the bending point. To improve this disadvantage, the bending points is replaced by a straight channel which is based on a Beehive type channel. The effects of inserted straight channel's length change on the heat transfer and pressure loss are analyzed. and the shape with the best performance is suggested. In addition Mass flow was various to analyze the trand Heat transfer and pressure Drop. variables were inserted straight channel length and channel length. The performance is compared by using an inserted straight channel length of 0.5mm,1mm and 2mm at a constant pitch and vertical length of the zigzag. The 3D simulaton of the Printed Circuit Heat Exchanger is performed using CFX. Thermal-hydraulic performance of the new shapes are quantitatively compared by using non dimensional Parameters. Pressure drop was promoted by increasing flow velocity due to reverse flow and stagnation phenomenon. Pressure drop and Heat transfer coefficient are increased when Straight channel and vertical length are increased. The highest performance is observed at 1 mm. The thermal hydraulic performance was compared with respact to the mass flow variation. Mass flow rate was changed from 1.41×10-4 to 2.48×10-4 kg/s. The 1mm and 0.5mm straight channel shape was improved by 26% compared to the Zigzag channel.