RT Journal Article
T1 Experimental heat transfer coefficients between a surface and fixed and fluidized beds with PCM
A1 Izquierdo-Barrientos, María Asunción
A1 Sobrino, Celia
A1 Almendros Ibáñez, José Antonio
AB This work presents an experimental study to  determine the capacity of a phase change material (PCM) in granular form  to be used in fixed and bubbling fluidized beds for thermal energy  storage. The experimental measurements are focused on determination of  the heat transfer coefficient between a heated surface immersed in the  bed and the granular PCM. The flow rate is varied to quantify its  influence on the heat transfer coefficient. The PCM used is Rubitherm  GR50 with a phase change temperature of approximately 50° C. The PCM is  available in two different particle sizes, 0.54 mm and 1.64 mm, of which  the finer is used in the fluidized bed and the coarser is used in the  fixed bed. In addition, the results obtained for the PCM are compared  with the heat transfer coefficients measured for sand, a material  commonly used for thermal storage. In comparing  the heat transfer coefficients for fixed and fluidized beds, the heat  transfer coefficients in the fluidized bed with PCM are nearly three  times higher than those for the fixed bed at the same gas flow rate.  This increase in the heat transfer is a result of two main factors:  first, the continuous renewal of PCM particles from the heated surface  when they are fluidized, and second, the large quantities of energy in  latent form absorbed by the PCM. In the fixed bed there is no renovation  of particles, consequently only a small percentage of particles are  able to change its phase. Hence, there is no increase in the heat  transfer coefficient due to this fact.
PB Elsevier
SN 1359-4311
YR 2015
FD 2015-03
LK https://hdl.handle.net/10016/20153
UL https://hdl.handle.net/10016/20153
LA eng
NO This work was partially funded by the Spanish Government (Project ENE2010-15403), theRegional Government of Castilla-La Mancha (Project PPIC10-0055-4054) and Castilla-La Mancha University (Project GE20101662).
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RD 1 sept. 2024