Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow | ||
| Engineering and Technology Journal | ||
| Article 16, Volume 41, Issue 1, January 2023, Pages 176-184 PDF (1.04 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.30684/etj.2022.135475.1274 | ||
| Authors | ||
| Nassr F. Hussein* 1; Sabah T. Ahmed2; Ali L. Ekaid3 | ||
| 1University of Technology, Baghdad, Iraq, 19006 | ||
| 2Bilad Alrafidain University college, Diyala, 32001, Iraq. | ||
| 3Mechanical Engineering Departement, University of Technology- Iraq | ||
| Abstract | ||
| The present work studied the influence of pulsating flow as an active method on the thermal performance of a double-pass solar air heater with a tubular solar absorber. A ball valve has been used as a pulse generator mounted at the downstream flow of the solar air heater. The experiments were under indoor conditions with a constant heat flux of 1000 W/m2, and different air mass flow rates ranged from 0.01 to 0.03 kg/s. Moreover, the study covered three pulsation frequencies varied from 1 to 3 Hz. Based on the experimental outcomes, it can be observed that the heat transfer rate is enhanced by applying the pulsating flow, where it was found that the outlet temperature in the case of applying the pulsating flow rises by about 25.6 - 27% as compared with the steady flow case. Moreover, pulsating flow offers a higher effective thermal performance by about 15.2 % at the maximum air mass flow rate compared with the steady flow. In addition, the findings pointed out that varying the pulsation frequency from 1 to 3 Hz produces an enhancement in heat transfer rate and in solar heater effective efficiency, where it was found that when changing the frequency from 1 to 3, the increment of effective efficiency ranged from 3.8 to 6.9 % depending on the air mass flow value. | ||
Highlights | ||
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| Keywords | ||
| Solar collectors; Pulsating flow; Counter-flow; Pulsating frequency; Tubular absorber | ||
| References | ||
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