An experimental investigation of a double pass solar air heater performance: A comparison between natural and forced air circulation processes

Salih, Mothana M. Mohamed; Alomar, Omar Rafae; Ali, Firas Aziz; Maher, Hareth

doi:10.1016/j.solener.2019.09.060

Cited by 60 publications

(13 citation statements)

References 25 publications

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“…39 The maximum temperature lift of about 34 °C was observed in the JISAC using pin-fin absorber, which is similar to the work reported by Salih et al. 40…”

Section: Resultssupporting

confidence: 86%

Experimental investigations on jet impingement solar air collectors using pin-fin absorber

Kannan¹,

Mohanraj

Sathyabalan³

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this paper, the performances of a novel jet impingement solar air collector (JISAC) using flat and pin-fin absorbers were experimentally investigated. The experimental observations in a JISAC have been made under the climatic conditions of Coimbatore city in India during the year 2019. The thermo-hydraulic analyses were conduced to study the influence of pressure drop across the perforated jet plate. The effects of solar irradiation, ambient temperature, ambient wind velocity and air mass flow rate through the JISAC duct using flat and pin-fin absorbers were studied. The air mass flow rate through the JISAC was optimized to 0.025 kg/s based on the experimental trials. Thermodynamic performance comparisons have been made among the flat and pin-fin absorbers. The results showed that, the JISAC using pin-fin absorber has 2–7°C higher air temperature at the outlet with 3–7%, 2–6% and 2–6% improved energy efficiency, thermo-hydraulic efficiency and exergy efficiency, respectively when compared to the JISAC using flat absorber. The pressure drop across the JISAC duct is about 90% higher when compared to the conventional solar air collectors. The pressure drop through the jet plate has increased the air velocity impinging on the absorber. As a result, the heat transfer coefficient between air and the absorber has been significantly improved.

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“…39 The maximum temperature lift of about 34 °C was observed in the JISAC using pin-fin absorber, which is similar to the work reported by Salih et al. 40…”

Section: Resultssupporting

confidence: 86%

Experimental investigations on jet impingement solar air collectors using pin-fin absorber

Kannan¹,

Mohanraj

Sathyabalan³

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Thus, the performances of Model‐1 and Model‐2 are evaluated in terms of thermal efficiency (

η

). The

η

has been determined as a ratio of gain heat to the total solar energy that received by the absorber as following 37,42 :

η goodbreak= \frac{Useful energy earned by air}{Total solar energy recieved by absorber},

where the thermal energy that transferred to air can be determined as follows:

Q_{u} goodbreak= \overset{m}{true} italicCp ((), T_{out} goodbreak- T_{in}) .

…”

Section: Experimentationmentioning

confidence: 99%

“…The experimentations in this work are arranged according to ASHRAE Standard. 37,38 For the accurate comparison between the two models, the experiments have been conducted under identical weather conditions to distinguish the effectiveness of new absorber plate in Model-1. Therefore, each model has a separate inlet and exits ducts.…”

Section: Experimentation Proceduresmentioning

confidence: 99%

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Improving the performance of solar air heater using a new model of V‐corrugated absorber plate having perforations jets

Maher

Salih

2022

Intl J of Energy Research

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Summary An experimental investigation on the performance of a solar air heater (SAH) system has been performed using a new model of v‐corrugated absorber plate having perforations jets. The effectiveness of new model has been compared with the conventional v‐corrugated absorber plate under identical operating conditions to display the effectiveness of new model. The new collector has been referred to Model‐1, whereas the conventional model has been referred to Model‐2. The experimentations have been conducted in December 2020. The results demonstrate that the performance of Model‐1 is considerably higher than Model‐2 by 9%, 11%, and 11.5% for the air mass flowrates 0.01, 0.015, and 0.02 kg/s, respectively. As mass flowrate is increased, the performances of both models have increased, where the highest efficiencies of Model‐1 and Model‐2 have been found 84.5% and 73%, respectively. A substantial difference in temperature has been found in Model‐1 as compared to the rest model. Regardless of the air velocity values, the maximum outlet temperatures have been found in Model‐1, whereas the peak plate temperatures have been observed in Model‐2. The improvement in the performance of Model‐1 confirms that the utilize of perforations jets v‐corrugated absorber plate has an extreme action on the rate of heat transfer.

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“…To improve the efficiency of solar energy, there are extensive studies and efforts have focused on improving the heat efficiency and optimizing the structure of solar air collectors [12][13][14][15]. A more effective approach is to maximize the contact between the circulating air and the absorber plate through forced turbulence in double channel, including V-corrugated or sine-wave absorber plates, with fins, baffles or ribs [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics and Parametric Analysis of an Improved Solar Wall

Zhao

Zhu

et al. 2021

Applied Sciences

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Solar air collectors installed on buildings can significantly reduce conventional energy consumption in winter and summer. However, some problems arise in the utilization process, such as overheating, inconvenient operation control and low energy efficiency, etc. This work is a parametric analysis focusing on the automatic control and thermal efficiency improvement of the solar wall. An improved color-changing solar wall integrated with automatic control components, such as a photoelectric fan and temperature-controlled damper, was proposed in this paper. Based on the experimental data, the average daily heat output of the color-changing solar wall is 1.08 MJ per unit floor area on clear days in winter and the average thermal efficiency is 56.8%. Meanwhile, a quantitative analysis was carried out based on monitoring experiments for evaluating the thermal characteristic of automatic control components. Furthermore, in order to improve the thermal performance of the solar wall, parametric analysis was performed by numerical simulation. Results from this paper can provide a theoretical basis for the application of solar air collectors in modern buildings.

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An experimental investigation of a double pass solar air heater performance: A comparison between natural and forced air circulation processes

Cited by 60 publications

References 25 publications

Experimental investigations on jet impingement solar air collectors using pin-fin absorber

Experimental investigations on jet impingement solar air collectors using pin-fin absorber

Improving the performance of solar air heater using a new model of V‐corrugated absorber plate having perforations jets

Thermal Characteristics and Parametric Analysis of an Improved Solar Wall

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