首页|Influences of variable porosity on CaO/Ca(OH)(2) thermochemical energy storage characteristics in direct/indirect heated reactor
Influences of variable porosity on CaO/Ca(OH)(2) thermochemical energy storage characteristics in direct/indirect heated reactor
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NSTL
Elsevier
In the present work, the influences of variable porosity of CaO/Ca(OH)(2), which is normally regarded as constant, on the thermochemical energy storage characteristics in direct/indirect heated reactor (DHR/IHR), are comprehensively investigated by establishing a transient multi-physics coupled model. It is found that, unlike the traditional constant porosity assumption, the variable porosity shows significantly two-fold competitive impacts. On the one hand, increasing/decreasing porosity increases/decreases the permeability of reaction bed, which leads to the drop/rise in pressure field and further the local reaction equilibrium temperature drop/rise. Thus, the local reaction rate increases/decreases correspondingly. On the other hand, increasing/decreasing porosity also decreases/increases the heat conductivity of the reaction bed, which leads to the drop/rise in transient temperature field. Thus, the transient reaction rate decreases/increases instantaneously. The results indicate that the constant porosity assumption may over/underestimate the performance of DHR/IHR during the charging (dehydration) process by around 9%, while underestimate the performances of both DHR and IHR during discharging (hydration) process by up to around 19%. It is also found that the variable porosity demonstrates greater influence on the discharging (hydration) process in DHR and on the charging (dehydration) process in IHR.
Thermochemical energy storageMultiphysicsVariable porosityDirect/indirect heated reactorCaO/Ca(OH)(2)DEHYDRATION PROCESSLAB SCALESYSTEMBEDREHYDRATIONCA(OH)(2)PARTPERFORMANCEPRESSURESMODEL
NSTL
Elsevier
