Energy, Exergy Analysis, and Optimizations of Collector Cover Thickness of a Solar Still in El Oued Climate, Algeria

Table 2

Summary of various researchers on the glass cover thickness.

Ref. no.	Glass cover thickness	Energy efficiency	Exergy efficiency
[28]	4 mm	-	-
	8 mm	-	-
	12 mm	-	-
[29]	3.5 mm	21.42%	-
	4 mm	28.09%	-
[30]	3.18 mm	26.22%	-
	4.76 mm	29.28%	-
	6.35 mm	18.95%
[31]	3 mm	32-34%	-
	4 mm	34-36%
	5 mm	30-32%	-
	6 mm	26-28%	-
[32]	4 mm		-
	8 mm	-	-
	>8 mm + air film	-	-
	12 mm	-	-
	>12 mm + air film	-	-
[33]	4 mm	27%	-
	5 mm	22%	-
	6 mm	17%	-
[34]	2 mm	45-50%	-
	3 mm	40-45%	-
	4 mm	30-35%	-
	5 mm	30%	-
	6 mm	25-30%	-
	7 mm	20-25%	-
	8 mm	15-20%
[35]	4 mm	-	-
	6 mm	-	-
[37]	2 mm	-	-
	6 mm	-	-
	10 mm	-	-
	14 mm	-	-
	18 mm	-	-
[38]	4 mm	-52.7%	-
	8 mm + air film		-
Our current work	3 mm	30.71%	2.46%
	5 mm	18.35%	1.38%
	6 mm	11.25%	0.84%