Effect of packing density on thermal properties of granular activated carbon packed bed by using of inverse heat conduction method

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.The ability of granular activated carbon (GAC) to adsorb large mass of refrigerant gases makes it ideal for use in thermal compressor. In order to make thermal compressor economically viable, the size must be reduced and for that reason thermal responses should be increase as much as possible during heating and cooling process. This paper investigates the effect of GAC bed density on the thermal transient responses when a sudden change in temperature is imposed on wall of a test sample reactor. The test sample consists of 1” OD stainless steel with 0.71 [mm]thickness and 200[mm]length that is loaded with compacted granular activated. The granular carbon used is 208C (coconut shell base) with 13×30 mesh size and provided by ‘Chemviron Carbon Company’. To find the heat transfer coefficient of the contact wall/packed carbon (h) and packed bed thermal conductivity (k) a numerical inverse heat conduction method is used in conjunction with an iterative process based on minimizing the Mean Square Error (MSE) from measured temperatures. Experimental work is carried out by measuring the wall and centre temperatures of submerged sample in a temperature controlled water bath at around 85[oC]. Five samples with the packed bed density ranging from 500 [kg/m3] to 800 [kg/m3] were tested and the results show a quasi-linear increase of both thermal conductivity (k) and heat transfer coefficient of the contact wall/packed carbon (h) with the packed bed density: 0.15 [W/m.K]< k < 0.45[W/m.K]and 150 [W/m2.K]< h < 1400 [W/m2.K].dc201

Investigating the effects of channel aspect ratio on fluid flow and heat transfer in absorber plates with minichannels

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.This study experimentally investigates the fluid flow and heat transfer in two solar thermal absorber plates for compact (thin and light-weight) solar thermal collectors. Two metal plates with 270 mm long, 0. 5 mm deep mini-channels having aspect ratios of 1 and 4 were studied. Constant heat flux, forced convection experiments were performed using Tyfocor® LS (a propylene glycol-based heat transfer fluid for thermal solar systems) at various flow rates and temperatures. Reynolds numbers were in the range 5-200. Measured Nusselt numbers were much lower than classical theory and were observed to be directly proportional to the product of the Reynolds number and Prandtl number (RePr). The plate with rectangular channels produced slightly higher Nusselt numbers and much lower pressure drops, making them a preferred option for this application

http://wrap.warwick.ac.uk/ Effect of packing density on thermal properties of granular activated carbon packed bed by using of inverse heat conduction method

Original citation: Khaliji Oskouei, M. and Tamainot-Telto, Zacharie (2014) Effect of packing density on thermal properties of granular activated carbon packed bed by using of inverse heat conduction method. Copies of full items can be used for personal research or study, educational, or not-forprofit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions: The version presented in WRAP is the published version or, version of record, and may be cited as it appears here. ABSTRACT The ability of granular activated carbon (GAC) to adsorb large mass of refrigerant gases makes it ideal for use in thermal compressor. In order to make thermal compressor economically viable, the size must be reduced and for that reason thermal responses should be increase as much as possible during heating and cooling process. This paper investigates the effect of GAC bed density on the thermal transient responses when a sudden change in temperature is imposed on wall of a test sample reactor