scholarly journals Experimental thermal performance analysis of finned tube-phase change material based double pass solar air heater

2019 ◽  
Vol 15 ◽  
pp. 100543 ◽  
Author(s):  
Muhammad Sajawal ◽  
Tauseef-ur Rehman ◽  
Hafiz Muhammad Ali ◽  
Uzair Sajjad ◽  
Ali Raza ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Performance ◽  
Finned Tube ◽  
Solar Air Heater ◽  
Double Pass ◽  
Air Heater ◽  
Change Material

scholarly journals Experimental Study on Double-Pass Solar Air Heater with and without using Phase Change Material

2019 ◽  
Vol 25 (2) ◽  
pp. 1-17 ◽  
Author(s):  
Abdulrahman Shakir Mahmood
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Phase Change Material ◽  
Air Temperature ◽  
Thermal Performance ◽  
Thermal Storage ◽  
Solar Air Heater ◽  
Double Pass ◽  
Air Heater ◽  
Change Material

In this paper, an experimental study was conducted to enhance the thermal performance of a double-pass solar air heater (SAH) using phase change material (PCM) for thermal storage at climatic conditions of Baghdad city - Iraq. The double-pass solar air heater integrated with thermal storage system was manufactured and tested to ensure that the air heating reserved after the absence of the sun. The rectangular cavity filled with paraffin wax was used as a latent heat storage and incorporated into the lower channel of solar air heater. Experiments were carried out to evaluate the charging and discharging characteristics of two similar designed solar air collectors with and without using phase change material at a constant air mass flow rate of (0.0375 kg/sec). The parameters that affect the thermal performance of the SAH with and without the PCMs presented by solar radiation, the difference in air temperature, outlet air temperature, instantaneous thermal efficiency, and daily efficiency are evaluated. The experimental results show that when using the PCM, the temperature of the outlet air was enhanced and increased over the ambient temperature by (1.5 - 6.5 C) after sunset for 5 hours period. It was found that the instantaneous thermal efficiency of the heater using thermal storage exceeds 100% after sunset, this is due to a large amount of heat stored in the paraffin wax that has been released during the discharge process. Also, it was found that the daily efficiency of the double pass SAH integrated with and without thermal energy storage unit was (56, 47%) respectively.  

scholarly journals Experimental analysis of solar air heater using polygonal ribs in absorber plate integrated with phase change material

2021 ◽  
pp. 345-345
Author(s):  
Kumar Varun ◽  
G. Manikandan ◽  
Kanna Rajesh ◽  
Venkata Poluru
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Heat Transfer Enhancement ◽  
Phase Change Material ◽  
Mass Flow ◽  
Solar Air Heater ◽  
Transfer Enhancement ◽  
Absorber Plate ◽  
Air Heater ◽  
Change Material

Heat transfer enhancement in Solar Air Heater (SAH) has been investigated by implementing rough surfaces in the absorber plate. We use paraffin wax is used as Phase Change Material (PCM) integrated with SAH as a Thermal Energy Storage (TES) system. A maximum convective heat transfer is attained during the daytime and retained as latent heat (LH) to discharge heat during OFF radiation. In this investigation, two types of absorber plates were employed such as flat & polygonal-shaped ribs at the test section. Further to investigate the heat transfer enhancement, the research was conducted with and without PCM. The study was carried out at the mass flow rates of 0.062 kg/s, 0.028 kg/s, and 0.01 kg/s to ascertain the enhancement of thermal efficiency and heat discharge duration. The temperatures of absorber plate Tp, ambient Tamb, outlet Tout and PCM along with Solar Intensity I (W/m-2) were taken as the main parameters. The research reveals that the absorber plate with polygonal ribs tested with PCM yields a higher temperature of 77?C with a mass flow rate of 0.062 kg/s during peak radiation. And discharged heat energy from PCM to absorber plate for 3.5 hours with a maximum temperature of 7.1?C.

Thermal performance analysis of a metal hydride reactor encircled by a phase change material sandwich bed

2020 ◽  
Vol 45 (43) ◽  
pp. 23076-23092
Author(s):  
Talal Alqahtani ◽  
Sofiene Mellouli ◽  
Ahmad Bamasag ◽  
Faouzi Askri ◽  
Patrick E. Phelan
Keyword(s):  
Performance Analysis ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Performance ◽  
Metal Hydride ◽  
Change Material
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