Specific heat capacities of carbon-based adsorbents for adsorption heat pump application

摘要

Highlights?Experimentally investigated the specific heat capacities of parent and surface treated activated carbon.?Experiments have been performed using a heat flux type DSC under nitrogen atmosphere.?The specific heat capacity data is furnished for carbon-based adsorbents from ambient temperature to 150°C.?These data are essential for a precise performance evaluation of adsorption heat pump systems.AbstractMicroporous adsorbents have been extensively employed in various sorption cycles. The specific heat capacity of such porous materials is an important parameter in adsorption simulation and system design. This article discusses the experimental evaluation of the specific heat capacities of several carbon-based adsorbents for cooling applications. The studied adsorbents include (i) parent Maxsorb III with different particle sizes, (ii) surface treated Maxsorb III (H2and KOH-H2) (iii) recently developed spherical activated carbon (KOH treated phenol resin, KOH6-PR) and (iv) expanded graphite. The specific heat capacity of these materials is measured at temperatures ranging from 30°C to 150°C using a heat flux type differential scanning calorimeter (DSC). Within the experimental conditions, no phase transition or thermal anomaly is detected for all the adsorbents. Surface treated adsorbent exhibits higher specific heat capacities whilst KOH treated phenol resin (KOH6-PR) has the lowest value among the studied adsorbents. High specific heat capacities in the surface treated Maxsorb III might be attributed to the effect of surface treatment and the presence of surface functional group. The model given by Perry and Green is employed to fit the experimental data. These experimental data together with the fitted parameters are essential in the design and simulation of adsorption heat pump systems.]]>