Wind-related heat transfer coefficient for flat-plate solar collectors

Department

Mechanical Engineering

Document Type

Article

Publication Title

Journal of Solar Energy Engineering, Transactions of the ASME

ISSN

0199-6231

Volume

109

Issue

2

DOI

10.1115/1.3268186

First Page

108

Last Page

110

Publication Date

1-1-1987

Abstract

Experiments were performed to evaluate the convective heat transfer coefficient for aflat plate mounted in a wooden model of a roof of a building. The experiments were carried out in a closed-circuit wind tunnel and included parametric adjustments of the roof tilt and Reynolds number, based on the length of the plate. The roof tilt was set at 0, 30, 45, 60, and 90 degrees and the Reynolds number ranged from 58,000 to 250,000. A transient, one lump, thermal approach was used for heat transfer calculations. Due to a separation bubble at the leading edge of the model, i.e., the roof, at angles of attack of less than 40 degrees, the flow became turbulent after reattachment. This resulted in a higher heat transfer than previously reported in the literature. At higher angles of attack, the flow was not separated at the leading edge and remained laminar. The heat transfer coefficient for higher angles of attack, i.e., a >40 deg, was found to be approximately independent of the angle of attack and in good agreement with the previously published results. © 1987 by ASME.

Link to Full Text

Share

COinS