Effect of absorber plate height on the performance of solar chimney utilized with porous absorber and integrated with an insulated room

Abstract

An experimental study has been carried out for testing the thermal performance and the thermal behavior enhancement of solar chimneys that can be achieved by adding metal foam. The solar chimney with test room system was located in Baghdad, Iraq, at latitude 33.3? N, longitude 44.4? E. In the experimental part of this study, outdoor tests were conducted from May to July, 202). On clear days, the tests were conducted from 9:00 a. m. to 4:00 p. m. The experimental side will compare the performance of two types of copper metal foam, 10 PPI and 40 PPI, (pores per inch) heat absorber plates at three different heights, 5 cm, 15 cm, and 25 cm. The results showed that the metal foam reduced the average temperature of the absorber plate. The highest temperature reduction was achieved with, 10 PPI and 40 PPI, absorber plates, 13.5 ?C and 8.3 ?C, respectively, at (H = 5 cm) and 60?. The maximum increase in air-flow velocity at the solar chimney with, 10 PPI and 40 PPI, absorber plates is, 43.7% and 25%, respectively, at (H = 5 cm). The absorber plate heights decrease the air velocity at the solar chimney. With metal foam as an absorber plate, 10 PPI and 40 PPI, the chimney's thermal efficiency is increased. At the absorber plate's height, the solar chimney's maximum thermal efficiency was 49%, 66.2%, and 72.1% (5 cm). At the height of the absorb-er plate, the maximum air change per hour was 18.8, 24.4, and 27.21 (5 cm).