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Keywords

Fins, v-groove, CFD, collectors, flat plate, solar air heater, Ansys Fluent

Document Type

Research Article

Abstract

```python text = """The adoption of solar energy and associated large-scale projects is on the rise to address the escalating global energy demand, owing to their cost-effectiveness, environmental friendliness, and status as clean energy sources. The primary objective of the present study is to investigate the performance of parallel-pass solar air heaters (SAHs) equipped with grooved and finned absorbers, as well as the performance of a triple-pass SAH with a grooved absorber plate, through numerical modelling. The absorber in the finned SAH had longitudinal fins on both the top and bottom surfaces. The heat and fluid properties of a parallel-pass v-grooved SAH (PPVSAH), a triple-pass v-grooved SAH (TPVSAH) and a parallel\x02pass finned SAH (PPFSAH) have been estimated using the CFD approach. A TPVSAH and PPVSAH have been subjected to numerical analysis and validated against experimental results from studies utilising similar models. The thermal performance,pressuredrop,andtemperaturedifferentialofSAHshavebeenassessednumericallyatflowratesof0.023kg/s, 0.015 kg/s, and 0.011 kg/s. Furthermore, numerical comparisons were made between PPVSAH, TPVSAH and PPFSAH. The computational results indicate that the highest thermal efficiencies for PPVSAH, TPVSAH, and PPFSAH were 81.95%, 74.37%, and 50.17%, respectively, at a flow rate of 0.023 kg/s. The most significant temperature differences of 33.8°C and 32.9°C were achieved in TPVSAH and PPFSAH, respectively, at a flow rate of 0.011 kg/s. The thermal performance and pressure drop of SAHs increase with increasing flow rate. The pressure decrease in SAHs in this study ranged from 0.48 to 2.95 Pa.""" import re # Look for hidden characters for i, c in enumerate(text): if ord(c) < 32 and ord(c) not in (9, 10, 13): print(f"Control char at {i}: {ord(c)}") # Check spacing issues in 'performance,pressuredrop,andtemperaturedifferentialofSAHshavebeenassessednumericallyatflowratesof0.023kg/s,' # Let's fix spacing and \x02 clean = text.replace('\x02', '-') # Fix the squished text if present squished = "performance,pressuredrop,andtemperaturedifferentialofSAHshavebeenassessednumericallyatflowratesof0.023kg/s," fixed_squished = "performance, pressure drop, and temperature differential of SAHs have been assessed numerically at flow rates of 0.023 kg/s," clean = clean.replace(squished, fixed_squished) # Clean up newlines into single spaces clean_single_line = re.sub(r'\s+', ' ', clean).strip() print("\nCleaned text:\n", clean_single_line) ``` ```text Control char at 717: 2 Cleaned text: The adoption of solar energy and associated large-scale projects is on the rise to address the escalating global energy demand, owing to their cost-effectiveness, environmental friendliness, and status as clean energy sources. The primary objective of the present study is to investigate the performance of parallel-pass solar air heaters (SAHs) equipped with grooved and finned absorbers, as well as the performance of a triple-pass SAH with a grooved absorber plate, through numerical modelling. The absorber in the finned SAH had longitudinal fins on both the top and bottom surfaces. The heat and fluid properties of a parallel-pass v-grooved SAH (PPVSAH), a triple-pass v-grooved SAH (TPVSAH) and a parallel-pass finned SAH (PPFSAH) have been estimated using the CFD approach. A TPVSAH and PPVSAH have been subjected to numerical analysis and validated against experimental results from studies utilising similar models. The thermal performance, pressure drop, and temperature differential of SAHs have been assessed numerically at flow rates of 0.023 kg/s, 0.015 kg/s, and 0.011 kg/s. Furthermore, numerical comparisons were made between PPVSAH, TPVSAH and PPFSAH. The computational results indicate that the highest thermal efficiencies for PPVSAH, TPVSAH, and PPFSAH were 81.95%, 74.37%, and 50.17%, respectively, at a flow rate of 0.023 kg/s. The most significant temperature differences of 33.8°C and 32.9°C were achieved in TPVSAH and PPFSAH, respectively, at a flow rate of 0.011 kg/s. The thermal performance and pressure drop of SAHs increase with increasing flow rate. The pressure decrease in SAHs in this study ranged from 0.48 to 2.95 Pa. ``` The adoption of solar energy and associated large-scale projects is on the rise to address the escalating global energy demand, owing to their cost-effectiveness, environmental friendliness, and status as clean energy sources. The primary objective of the present study is to investigate the performance of parallel-pass solar air heaters (SAHs) equipped with grooved and finned absorbers, as well as the performance of a triple-pass SAH with a grooved absorber plate, through numerical modelling. The absorber in the finned SAH had longitudinal fins on both the top and bottom surfaces. The heat and fluid properties of a parallel-pass v-grooved SAH (PPVSAH), a triple-pass v-grooved SAH (TPVSAH) and a **parallel-pass** finned SAH (PPFSAH) have been estimated using the CFD approach. A TPVSAH and PPVSAH have been subjected to numerical analysis and validated against experimental results from studies utilising similar models. The thermal performance, pressure drop, and temperature differential of SAHs have been assessed numerically at flow rates of 0.023 kg/s, 0.015 kg/s, and 0.011 kg/s. Furthermore, numerical comparisons were made between PPVSAH, TPVSAH and PPFSAH. The computational results indicate that the highest thermal efficiencies for PPVSAH, TPVSAH, and PPFSAH were 81.95%, 74.37%, and 50.17%, respectively, at a flow rate of 0.023 kg/s. The most significant temperature differences of 33.8°C and 32.9°C were achieved in TPVSAH and PPFSAH, respectively, at a flow rate of 0.011 kg/s. The thermal performance and pressure drop of SAHs increase with increasing flow rate. The pressure decrease in SAHs in this study ranged from 0.48 to 2.95 Pa.

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Publication Date

31-12-2025

First Page

57

Last Page

67

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