A Numerical Approach on Waste Heat Recovery through Sidewall Heat-Exchanging in an Aluminum Electrolysis Cell

Table 1

Comparison of several selected heat-transfer mediums [14–16].

Properties		Solar salt	Hitec	Hitec XL	LiNO3	Therminol VP-1
Compositions	KNO3	60	53	7	—	—
	NaNO2	—	40	—	—	—
	NaNO3	40	7	45	—	—
	Ca(NO3)2	—	—	48	—	—
Melting point (°C)		220	142	120	120	13
Maximum service temperature (°C)		600	535	500	550	400
Properties when operating at 300°C or below	Density (kg·m^−3)	1899	1640	1992	—	815
	Viscosity (mPa·s)	3.26	3.16	6.37	—	0.20
	Specific heat capacity (J·kg^−1·K^−1)	1495	1560	1447	—	2319