Annual Performance Evaluation of Evacuated Tube Solar Air Collector With Phase Change Material

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Neeraj Mehla ◽  
Manoj Kumar ◽  
Avadhesh Yadav
Keyword(s):  
Performance Evaluation ◽  
Phase Change ◽  
Phase Change Material ◽  
Average Temperature ◽  
Hot Air ◽  
Solar Air Collector ◽  
Collector Efficiency ◽  
Evacuated Tube ◽  
Change Material

Abstract This manuscript has been presented to evaluate the annual performance of evacuated tube solar air collector (ETSAC) by using phase change material (PCM). The PCM (acetamide) simultaneously stores and exchange the heat to the air amid day hours. The heat stored by the PCM has been used to deliver hot air amid night hours. The performance of the system has been analyzed with a circular fin configuration along with reflectors at 0.035 kg/s air flowrate for 12 typical days. The performance of the system has been found excellent in the month of July. The maximum average temperature of PCM has been found to be as 87.8 °C and the maximum average collector efficiency as 31.4%.

Thermal analysis on charging and discharging behaviour of a phase change material-based evacuated tube solar air collector

2016 ◽  
Vol 27 (2) ◽  
pp. 156-172 ◽  
Author(s):  
Neeraj Mehla ◽  
Avadhesh Yadav
Keyword(s):  
Phase Change ◽  
Total Energy ◽  
Phase Change Material ◽  
Flow Rate ◽  
Air Flow ◽  
Air Flow Rate ◽  
Flow Rates ◽  
Solar Air Collector ◽  
Evacuated Tube ◽  
Change Material

The performance analysis on the phase change material-based evacuated tube solar air collector was examined under consecutive and simultaneous charging and discharging modes. Acetamide was used as phase change material. The system performance was evaluated on the basis of the phase change material storage system energy efficiency, exergy efficiency, collector efficiency, the instantaneous energy stored in the phase change material and total energy stored by the system at low and high air flow rates of 0.018 kg/s and 0.035 kg/s, respectively. The maximum average efficiency (17.9%) of the collector was obtained at a high air flow rate during simultaneously charging and discharging of the phase change material. The results obtained demonstrate that the system is more effective when it is operated with high air flow rate during simultaneously charging and discharging of the phase change material. The average total energy at high air flow rates is 1.01 to 1.02 times more in comparison to that at low air flow rates. The findings show the feasibility of the phase change material-based evacuated tube solar air collector for producing hot air for space heating during consecutive and simultaneous charging and discharging of the phase change material in northen Indian climatic conditions. This system would be relevant in areas with good sunlight.

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