Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

Jalil, Jalal M.; Ali, Shrooq J.

doi:10.30684/etj.v39i1a.1704

Cited by 13 publications

(8 citation statements)

References 13 publications

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“…From Figure 8b, it can be concluded that decreasing the porosity can improve the efficiency; this is because the reduction in porosity can increase the heat transfer area per unit volume. This finding is in agreement from those in [11,50,51]. In addition, decreasing the porosity produces a larger surface area for heat transfer, and the higher volumetric heat-transfer coefficient greatly improved due to flowing air turbulence.…”

Section: Determination Of the Optimum Porositysupporting

confidence: 90%

Performance Analysis of a Double Pass Solar Air Thermal Collector with Porous Media Using Lava Rock

et al. 2022

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This paper investigates double-pass solar air thermal collectors with lava rock as the porous media. The addition of lava rock serves as short-term sensible thermal storage for a solar drying system. It also enhances the convective heat transfer rate to the airflow due to an increased heat transfer area and increased turbulence in the air channel. A mathematical model was developed based on energy balance equations and was numerically solved in MATLAB. The collector’s thermal performance was studied at various levels of solar intensity and at different wind speeds for different design parameters: collector size, air mass flow rate, and lava rock volume. From the study, the optimum efficiencies that were obtained in the range between the intensities of 500 W/m2 and 800 W/m2 were 62% to 64%, respectively, with an optimum flow rate of 0.035 kg/s. The optimum porosity of about 89% was selected for the collector by considering the pressure drop and thermal efficiency. An optimal temperature output range between 41.7 °C and 48.3 °C could be achieved and was suitable for agricultural and food drying applications. Meanwhile, compared to conventional DPSAHs, the average percentage increase in the output temperature of the DPSAH with lava rock was found to be higher by 17.5%.

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Section: Determination Of the Optimum Porositysupporting

confidence: 90%

Performance Analysis of a Double Pass Solar Air Thermal Collector with Porous Media Using Lava Rock

et al. 2022

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“…The maximum temperature difference when using steel wire mesh reaches 34 o C at porosity 99.995%, meanwhile, the maximum temperature difference when using Aluminum reach 41 o C at porosity 99.997% as shown in Figures (11) (12). The maximum efficiency when using steel wire mesh reaches 67.4% at porosity 99.995%, meanwhile the maximum efficiency when using Aluminum reaches 79.4% at porosity 99.997% as shown in Figures (13)…”

Section: Resultsmentioning

confidence: 90%

“…For flow rates less than 0.2 L/s, Nano fluid usage at low concentrations might improve thermo-hydraulic performance. Jalal M. Jalil et al [13] investigated the effect of porous medium in the lower channel of double pass air heater solar collector, used stainless steel wire mesh and steel wool as porous medium, founded enhancement in thermal efficiency.the thermal performance of the double passage water in the evacuated tube in the parabolic trough collector is being studied by a variety of porous media, porosity, mass flow rates and solar radiation. The main objective is to increase parabolic trough collector thermal performance that may be utilized to heat water.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermal Performance of Evacuated Tube with Parabolic Trough Collector with and without Porous Media

Bassem

Jalil

Ismael

2022

IOP Conf. Ser.: Earth Environ. Sci.

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In this paper a new model has demonstrated that it operates in a moderate performance scale to generate hot water. In its early stage, the preliminary model, which built with double pass water tube inside evacuated tube, was investigated experimentally. The model was tested inside room under different operation conditions in terms of solar radiation 300, 400, 500 and 600 W/m2 and water mass flow rates 0.00305 and 0.0083kg/s. In the first case, there was a problem because of the air gap inside the tube and surrounding the double pass water tube, so In the second stage, two different filling medium inside the evacuated tube was proposed to modify the preliminary model. The mediums cases include porous media (stainless steel wire mesh and Aluminum fiber metallic). The results show that maximum efficiency without porous media was 62.4% at 0.0083 kg/s and heat flux 600 W/m2, but after porous media applied, the efficiency reached 79.4% at 99.997% porosity of Aluminum fiber metallic and heat flux 600 W/m2 with same water mass flow.

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“…Single-pass SAHs produced a better rise in temperature at the outlet by inserting a partially filled wire mesh in a number of studies: Abed et el. [24] utilised a 'U'-type arrangement of aluminium wire mesh and compared it with 'V'-type soft steel wire mesh as a corrugated absorber; Devecioglu et al [25] utilised a copper wire mesh at four equal distances in the vertical direction, i.e., keeping perpendicular to the absorber plate; Ghritlahre et al [26] and Rajarajeswari et al [27] utilised a mesh in the diagonal direction lower side at the inlet and upper side at the outlet of an SAH; Sozen et al [28] utilised an iron wire mesh, keeping at 100 mm equal intervals of distance perpendicular to the absorber plate; and Jalil and Ali [29] utilised steel wool and six layers at equal distances of stainless steel wire mesh, which improved the thermal performance of a single-pass SAH.…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic Efficiency of a Solar Air Heater in the Presence of Graded Aluminium Wire Mesh—A Combined Experimental–Numerical Study

2023

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In this work, aluminium wire mesh (WM) samples with 3, 9, and 18 pores per inch (PPI) and porosities of 0.894, 0.812, and 0.917, respectively, were combined together to form graded structures including 3-9-18, 9-18-3, and 18-3-9 PPIs. A 5 mm thickness for each WM was considered for a length of 2 m and inserted into a single-pass solar air heater (SAH) in which the height of the SAH was 120 mm. For the numerical analysis, a 3D numerical model was considered in ANSYS fluent software, and the Rosseland radiation model renormalization group (RNG) k-ε enhanced wall function was incorporated to account for solar radiation. The local thermal equilibrium (LTE) model was considered to obtain the heat-transfer characteristics of the WM. The numerical results of the thermohydraulic performance parameter (THPP) of the 9-18-3 PPI WM were 13.04% and 11.92% higher than the 3-9-18 and 18-3-9 PPI samples, respectively. Later, 25% of the 9-18-3 graded wire mesh (GWM) was considered at four different locations, i.e., 0, 0.5, 1, and 1.5 m away from the inlet, and analysed to obtain the best location for efficient heat transfer. The computational results show that 1.5 m away from the inlet is the best location among the different locations considered. The experimental results of the GWM at 1.5 m away from the inlet demonstrated a 20.91% and 23.32% increase in thermal efficiency compared to the empty channel for the 0.027 kg/s and 0.058 kg/s mass flow rates, respectively. From numerical-cum-experimental analysis, it was found that inserting 25% length of GWM of the entire length of the test section at a distance of 1.5 m from the inlet in single pass SAH improves the overall performance of the empty channel of single-pass SAH.

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Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

Cited by 13 publications

References 13 publications

Performance Analysis of a Double Pass Solar Air Thermal Collector with Porous Media Using Lava Rock

Performance Analysis of a Double Pass Solar Air Thermal Collector with Porous Media Using Lava Rock

Investigation of Thermal Performance of Evacuated Tube with Parabolic Trough Collector with and without Porous Media

Thermohydraulic Efficiency of a Solar Air Heater in the Presence of Graded Aluminium Wire Mesh—A Combined Experimental–Numerical Study

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