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Research Article

Research on the Heat Transfer and Pressure Drop by Installation Conditions of Rectangular Obstacle in a Solar Air Heater Based on CFD

CFD를 활용한 태양열 공기가열기 내 사각저항체 설치 조건에 따른 열전달 및 압력강하에 관한 연구

Hwi-Ung Choi1
,
Young-Bok Kim2
,
Chang-Hyo Son3
,
Jung-In Yoon3
,
Kwang-Hwan Choi3*
최 휘웅1
,
김 영복2
,
손 창효3
,
윤 정인3
,
최 광환3*
1Graduate School of Refrigeration and Air-conditioning Engineering, Pukyong National University, Graduate student
2Dept. of Mechanical System Engineering, Pukyong National University, Professor
3Dept. of Refrigeration and Air-conditioning Engineering, Pukyong National University, Professor
1부경대학교 냉동공조공학과 대학원, 대학원생
2부경대학교 기계시스템공학과, 교수
3부경대학교 냉동공조공학과, 교수
*Corresponding Author 
28 February 2019. pp. 77-89
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Abstract

The solar air heater has various performances according to an obstacle installed in the air duct. Many studies on thermal performance have been conducted. But many of these studies were using a kind of rib type obstacle attached at the bottom of absorbing plate, but they are so hard to be manufactured. In this study, characteristics of the heat transfer and pressure drop in the solar air heater with various horizontal rectangular obstacles was investigated by CFD (Computational Fluid Dynamics) analysis. As a result, the heat transfer performance was improved from 1.2 to 3.32 times depending on installation conditions of rectangular obstacle. The pressure drop, however, also increased with increment of heat transfer performance from 2.8 to 180 times only by changing installation conditions of rectangular obstacle. Thus, the performance factor presenting the thermal performance enhancement on the same pressure drop was also confirmed. As a result, the highest value of 0.828 as better performance factor was obtained at the lower height of rectangular obstacle and this value has started to decrease with increment of heat transfer performance. In the end, it could be confirmed that the pressure drop was carried higher than the quantity of improvement of the heat transfer performance when the heat transfer performance was increased by change of installation conditions of rectangular obstacle. Both heat transfer enhancement and pressure drop to be required for system need to be considered before the rectangular obstacles are applied to the solar air heater.

Keywords
Solar thermal system
Solar collector
Solar air heater
Computational fluid dynamic
Energy saving

키워드
태양열 시스템
태양열 집열기
태양열 공기 가열기
전산유체역학
에너지절약
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Information
  • Publisher :Korean Solar Energy Society
  • Publisher(Ko) :한국태양에너지학회
  • Journal Title :Journal of the Korean Solar Energy Society
  • Journal Title(Ko) :한국태양에너지학회 논문집
  • Volume : 39
  • No :1
  • Pages :77-89
  • Received Date : 2019-01-14
  • Revised Date : 2019-01-30
  • Accepted Date : 2019-02-11
  • DOI :https://doi.org/10.7836/kses.2019.39.1.077
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