A simple calorimeter to measure specific heat of activated carbon prepared for pressure swing adsorption refrigeration system

Abstract

A new calorimeter to measure specific heat of indigenously prepared granular activated carbon (AC) for application in a refrigeration system based on gas adsorption–desorption mechanism is presented. This calorimeter allows specific heat measurements in high (305.5–317.8 K) as well as low (254.6–264 K) temperature ranges. The specific heat of prepared AC on measurement using developed calorimeter has been found to be 1.062 J g−1 K−1. Preparation, instrumental analyses and influence of various physical properties of AC on its specific heat have also been discussed. Characterisation results of AC demonstrate that it can be efficiently used in such cold producing system down to refrigeration and cryogenic temperature. © 2012 Canadian Society for Chemical Engineering

Dynamics of Hydrogen Storage through Adsorption: Process Simulation and Energy Analysis

“…Value Reference a (J•mol While most of parameters required for simulation are well-known (physical characteristics of the fluids or materials employed), several parameters remain uncertain, in particular the heat transfer coefficient and the specific heat of the adsorbent. Two parameters are evaluated to determine their influence on the final result of the simulation; the heat transfer coefficient H c , which is expected to range from 20 W•m −2 •K −1 to 100 W•m −2 •K −1 in water cooling systems [26] and the specific heat of the adsorbent (C s ), which can vary between 600 J•kg −1 •K −1 and 1100 J•kg −1 •K −1 with respect to the temperature of the activated carbon [55]. A sensitivity analysis is performed to examine the more accurate set of values, this was carried out by determining the coefficient of determination for both charging and cooling and the difference between the pressure and temperature at the end of the charging.…”