NPG–TRIS Thermal Storage System. Quantification of the Limiting Processes: Sublimation and Water’s Adsorption
Noelia De La Pinta,
Sergio Santos-Moreno,
Stephania Doppiu,
Josu M. Igartua,
Elena Palomo del Barrio,
Gabriel A. López
Affiliations
Noelia De La Pinta
Physics Department, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
Sergio Santos-Moreno
Physics Department, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
Stephania Doppiu
Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, 01510 Vitoria-Gasteiz, Spain
Josu M. Igartua
Physics Department, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
Elena Palomo del Barrio
Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, 01510 Vitoria-Gasteiz, Spain
Gabriel A. López
Physics Department, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
The NPG–TRIS binary system (NPG = (CH3)2C(CH2OH)2 = 2,2-dimetyl-1,3-propanodiol; TRIS = NH2C(CH2OH)3 = 2-Amino-2-(hydroxymethyl)-1,3-propanediol) was intensively investigated as a thermal energy storage system, due to the reversibility of its phase transitions and their associated energy. An adapted methodology was applied to precisely quantify its sublimation tendency. Relevant thermochemical data were revisited and evaluated using some specific experimental procedures. We also determined that the widely accepted requirement of working in an inert atmosphere to avoid deviations due to hygroscopicity is not necessary. Nevertheless, to take advantage of the energetic properties of the NPG–TRIS system, closed containers will be required to avoid NPG losses, due to its quantitatively determined high sublimation tendency.
