Abstract
This study describes an experimental investigation of the thermal efficiency of stainless steel mesh and steel wool as a porous medium in the lower channel of a double pass solar air heater. An experimental setup was planned and developed. Various types of porous media with high thermal conductivity and with different porosities have been tested. The effects of the porosity of wire mesh, the thermal conductivity of porous media, mass flow rate, and the intensity of radiation have been studied. Experimental results show that thermal efficiency with using porous media is greater than without using porous media. When used steel wool as a porous medium, the thermal efficiency reached 79.82 percent while it can be achieved 76. The percent by using stainless mesh as porous material. The reduction in porosity increasing thermal efficiency. The thermal efficiency of multi-pass solar air collector when used steel wool as porous media is 6, 12.6 and31.7percent higher than without porous media at porosity 98.75, 97.5, and 96.25percent. While it can increase 8.1 and 28.5 percent at porosity 97.875 and 95.75 percent when using stainless steel as porous media.
Highlights
A solar air collector is a device that utilizes solar energy for heating air which acts as a heat exchanger converts solar energy into thermal energy in the transport medium [1]
The researchers studied the effects of copper metal foam on thermal performance and the results showed that using the porous substrate improves the amount of Nusselt and average thermal efficiency up to 82% and 18.5% respectively
An experimental investigation of double pass solar air heater is presented with two types of porous media have different high thermal conductivity
Summary
A solar air collector is a device that utilizes solar energy for heating air which acts as a heat exchanger converts solar energy into thermal energy in the transport medium [1]. One of the extensively studied improvements to Solar Air Heater (SAH) is the use of double pass airflow up and down its absorber plate to reduce heat losses, increase the air path inside the solar collector and increase its performance [9]. S. Lundström 2020 [12] studied the effect of thin porous media have higher thermal conductivity covering the absorber plate of a solar collector. Many of the previous papers studied double pass solar air heater with porous media, as well as studied the effect of porosity on efficiency. An experimental investigation of double pass solar air heater is presented with two types of porous media have different high thermal conductivity (stainless steel and steel wool). : Thermal Efficiency ( %) List of abbreviations DPSAH: Double pass solar air heater SPSAH: Single-pass solar air heater SAHs: Solar Air Heaters MPSAH: Multi-pass solar air heater PM: Porous Media WPM: With Porous Media WOPM: Without Porous Media
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