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Dynamics and useful heat of the discharge stage of adsorptive cycles for long term thermal storage. / Palomba, Valeria; Sapienza, Alessio; Aristov, Yuri.
в: Applied Energy, Том 248, 15.08.2019, стр. 299-309.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Dynamics and useful heat of the discharge stage of adsorptive cycles for long term thermal storage
AU - Palomba, Valeria
AU - Sapienza, Alessio
AU - Aristov, Yuri
N1 - Publisher Copyright: © 2019 Elsevier Ltd
PY - 2019/8/15
Y1 - 2019/8/15
N2 - Interest towards adsorption heat storage, especially for long-term (seasonal) applications, is growing. The previous studies have always treated the heat storage cycle as a fully temperature-initiated process, similarly to common adsorption cooling and heating cycles. However, in long term storage applications, the discharge stage of the cycle is initiated by a jump of pressure rather than by a traditional drop of temperature. This requires specific investigations on the useful heat recoverable as well as on the adsorption dynamics. In the present paper, an appropriate experimental methodology was applied for studying the heat discharge stage. Three well known adsorbents (Mitsubishi AQSOA FAM-Z02, silica Siogel and composite LiCl/silica) were experimentally tested in a lab-scale heat storage unit, evaluating the effect of cycle operating parameters. The results, elaborated in terms of useful heat recoverable from the charged adsorbent, highlighted that the evaporation temperature and the flow rate of heat transfer fluid have a great influence on the adsorption dynamics and the useful heat. For the silica gel and FAM Z02, the maximum heat storage capacity 450 kJ/kg is reached at the evaporation temperature of 25 °C. The composite performs better at low evaporation temperatures, allowing heat upgrade even at 5 °C. The flow rate of the heat transfer fluid has a more significant effect on FAM Z02 than on the other adsorbents, for which an optimal flow rate of 1.2 kg/min was found.
AB - Interest towards adsorption heat storage, especially for long-term (seasonal) applications, is growing. The previous studies have always treated the heat storage cycle as a fully temperature-initiated process, similarly to common adsorption cooling and heating cycles. However, in long term storage applications, the discharge stage of the cycle is initiated by a jump of pressure rather than by a traditional drop of temperature. This requires specific investigations on the useful heat recoverable as well as on the adsorption dynamics. In the present paper, an appropriate experimental methodology was applied for studying the heat discharge stage. Three well known adsorbents (Mitsubishi AQSOA FAM-Z02, silica Siogel and composite LiCl/silica) were experimentally tested in a lab-scale heat storage unit, evaluating the effect of cycle operating parameters. The results, elaborated in terms of useful heat recoverable from the charged adsorbent, highlighted that the evaporation temperature and the flow rate of heat transfer fluid have a great influence on the adsorption dynamics and the useful heat. For the silica gel and FAM Z02, the maximum heat storage capacity 450 kJ/kg is reached at the evaporation temperature of 25 °C. The composite performs better at low evaporation temperatures, allowing heat upgrade even at 5 °C. The flow rate of the heat transfer fluid has a more significant effect on FAM Z02 than on the other adsorbents, for which an optimal flow rate of 1.2 kg/min was found.
KW - Adsorption dynamics
KW - Adsorption heat storage
KW - Heat rejection
KW - Long term heat storage
KW - Useful heat
KW - TRANSFORMATION
KW - SYSTEM
KW - PERFORMANCE
KW - OPERATING-CONDITIONS
KW - SORPTION
KW - WATER-ADSORPTION
KW - CHILLERS
KW - AMBIENT HEAT
KW - WORKING PAIR
KW - ENERGY-STORAGE
UR - http://www.scopus.com/inward/record.url?scp=85064627559&partnerID=8YFLogxK
U2 - 10.1016/j.apenergy.2019.04.134
DO - 10.1016/j.apenergy.2019.04.134
M3 - Article
AN - SCOPUS:85064627559
VL - 248
SP - 299
EP - 309
JO - Applied Energy
JF - Applied Energy
SN - 0306-2619
ER -
ID: 19647139