TY - JOUR
T1 - Experimental and numerical investigations for effective thermal conductivity in packed beds of thermochemical energy storage materials
AU - Walayat, Khuram
AU - Duesmann, Jason
AU - Derks, Thomas
AU - houshang Mahmoudi, Amir
AU - Cuypers, Ruud
AU - Shahi, Mina
N1 - Elsevier deal
PY - 2021/7/5
Y1 - 2021/7/5
N2 - Salt hydrates are promising candidates for long-term thermochemical heat storage (TCHS) in the building environment. In such storage systems, the surplus of energy will be exploited in an endothermic reaction to dehydrate the salt hydrates. Once it is demanded, the stored energy will be released through an exothermic reaction by hydrating the salt, which results in an increase in the mass and temperature of salt particles as well as changes in the species of material. In order to construct an improved storage system, it is very important to deeply understand the details of the heat and mass transfer processes in the packed beds of salt hydrates. Poor heat (in the closed systems) and mass transfer (in open systems) can be the bottleneck in this technology. The main objective of this work is to investigate how heat transfer will be affected by applied pressure, particle size, and packing arrangement through calculating/measuring the effective thermal conductivity of the packed beds of salt hydrates. This is achieved by applying and developing a CFD-DEM model and by experimental measurements in a vacuum oven. Comparisons are carried out for the numerical results at low and high ambient pressures with the experimental measurements, which show a very good agreement. The obtained results show the effect of natural convection in the packed bed when the higher vapor pressure is applied.
AB - Salt hydrates are promising candidates for long-term thermochemical heat storage (TCHS) in the building environment. In such storage systems, the surplus of energy will be exploited in an endothermic reaction to dehydrate the salt hydrates. Once it is demanded, the stored energy will be released through an exothermic reaction by hydrating the salt, which results in an increase in the mass and temperature of salt particles as well as changes in the species of material. In order to construct an improved storage system, it is very important to deeply understand the details of the heat and mass transfer processes in the packed beds of salt hydrates. Poor heat (in the closed systems) and mass transfer (in open systems) can be the bottleneck in this technology. The main objective of this work is to investigate how heat transfer will be affected by applied pressure, particle size, and packing arrangement through calculating/measuring the effective thermal conductivity of the packed beds of salt hydrates. This is achieved by applying and developing a CFD-DEM model and by experimental measurements in a vacuum oven. Comparisons are carried out for the numerical results at low and high ambient pressures with the experimental measurements, which show a very good agreement. The obtained results show the effect of natural convection in the packed bed when the higher vapor pressure is applied.
KW - UT-Hybrid-D
KW - Conduction
KW - Dehydration
KW - Effective thermal conductivity
KW - Hydration
KW - Natural convection
KW - Radiation
KW - Thermochemical heat storage
KW - CFD-DEM
UR - http://www.scopus.com/inward/record.url?scp=85105831214&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2021.117006
DO - 10.1016/j.applthermaleng.2021.117006
M3 - Article
AN - SCOPUS:85105831214
VL - 193
JO - Applied thermal engineering
JF - Applied thermal engineering
SN - 1359-4311
M1 - 117006
ER -