Current progress in adsorption technologies for low-energy buildings

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Table 2 Maximal mass of water adsorbed w _max, average desorption heat ΔH _des, maximal heat storage densities \( {A}_{\max}^{mas} \) and \( {A}_{\max}^{vol} \) (calculated by eqs. (1) and (2))

Adsorbent	w _max, g/g	ΔH _des, MJ/kg	\( {A}_{\max}^{mas} \), MJ/kg	\( {A}_{\max}^{vol} \), GJ/m³	Reference
Silica gel Fuji RD	0.4	2.40	0.96	0.77	[95]
Zeolite 13X	0.34	3.8	1.29	0.83	[96]
Zeolite 4A	0.22	3.05	0.67	0.49	[97]
Zeolite MgX	0.45	2.68	1.21	-	[53]
SWS-1 L = CaCl₂/silica gel	0.65	2.65	1.72	1.55	[98]
SWS-9 V = LiNO₃/Vermiculite	1.80	2.30	4.15	1.16	[75]
SWS-1 V = CaCl₂/Vermiculite	1.80	2.35	4.2	1.25	[99]
SIM-3b = MgSO₄/Vermiculite	1.94	-	0.41^a	0.14	[35]
(MgSO₄ + MgCl₂)/Attapulgite	-	-	1.59^b	-	[54]
AQSOA-Z02	0.33	3.25	1.07	0.55	[100]
AlPO-Tric	0.31	3.17	0.98	-	[56]
MIL-101	1.40	1.83	2.57	-	[62]
MIL-125NH₂	0.47	2.85	1.33	0.39	[66]
MOF-841	0.48	3.05	1.47	-	[67]

^a the value was obtained by integrating DSC-thermogram of the sample within a temperature range of 30 to 100 °C; it is likely to be underestimated
^b the isothermal heat directly measured during water sorption at 30 °C and a relative humidity of 85 % on the sample preliminary dried at 130 °C