Dynamics and useful heat of the discharge stage of adsorptive cycles for long term thermal storage
| Autor: | Alessio Sapienza, Valeria Palomba, Yuri I. Aristov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
020209 energy Composite number Adsorption dynamics Thermodynamics 02 engineering and technology Evaporation temperature Management Monitoring Policy and Law Adsorption heat storage Thermal energy storage Long term heat storage chemistry.chemical_compound Adsorption 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Useful heat Silica gel Mechanical Engineering Drop (liquid) Optimal flow Heat rejection Building and Construction Volumetric flow rate General Energy chemistry |
| Zdroj: | Applied energy 248 (2019): 299–309. doi:10.1016/j.apenergy.2019.04.134 info:cnr-pdr/source/autori:Palomba, Valeria; Sapienza, Alessio; Aristov, Yuri/titolo:Dynamics and useful heat of the discharge stage of adsorptive cycles for long term thermal storage/doi:10.1016%2Fj.apenergy.2019.04.134/rivista:Applied energy/anno:2019/pagina_da:299/pagina_a:309/intervallo_pagine:299–309/volume:248 |
| ISSN: | 0306-2619 |
| Popis: | 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 degrees C. The composite performs better at low evaporation temperatures, allowing heat upgrade even at 5 degrees 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. |
| Databáze: | OpenAIRE |
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