Prashant Dhiman

TL;DR: In this paper, an analytical model describing the various temperatures and heat transfer characteristics of a parallel flow packed bed solar air heater (PFPBSAH) was developed and employed to study the effects of the mass flow rate and varying porosities of the packed material on its thermal performance.

TL;DR: In this paper, the effect of air mass flow rates and bed porosity on the thermal and thermohydraulic efficiencies of the counter and parallel flow packed bed solar air heaters are investigated theoretically and experimentally.

TL;DR: In this paper, an analytical and response surface methodology combined approach has been applied to investigate the thermal and thermohydraulic performances of a novel type double pass packed bed solar air heater under external recycle with wire mesh screen as a packed bed material.

TL;DR: In this article, the authors conducted a comprehensive review on the thermal performance of double pass packed bed solar air heaters and found that the use of porous packed bed material in the upper channel significantly increases thermal performance as compared to solar air heating without packed bed and with packed bed when porous material is provided in the lower channel.

TL;DR: In this article, a finite volume method is applied for the thermal performance prediction of a hybrid earth to air tunnel heat exchanger whereas process parameters are optimized using response surface methodology. But the performance of HEAHX is about three times higher than as compared to individual EAHX.