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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))

From: Current progress in adsorption technologies for low-energy buildings

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 - 0.41a 0.14 [35]
(MgSO4 + MgCl2)/Attapulgite - - 1.59b - [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]
  1. 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
  2. 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