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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1100-A

Book of abstracts draft
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Influence of additives in silica gel on water vapor kinetics sorption

Karol SZTEKLER, AGH University of Science and Technology, Poland
Wojciech KALAWA, AGH University of Science and Technology, Poland
Agata MLONKA-MĘDRALA, AGH University of Science and Technology, Poland
Lukasz MIKA, AGH University of Science and Technology, Poland
Jaroslaw KRZYWANSKI, Jan Dlugosz University in Czestochowa, Poland
Karolina GRABOWSKA, Jan Dlugosz University in Czestochowa, Poland
Marcin SOWA, AGH University of Science and Technology, Poland
Wojciech NOWAK, AGH University of Science and Technology, Poland

According to a report by the International Refrigeration Institute in Paris, the refrigeration sector uses around 20% of the cost of producing electricity. The estimates of IEA (International Energy Agency) show that about 10% of the demand for electrical energy is consumed for cooling of buildings. The air conditioning installations of buildings mainly use compressor chillers where electricity is employed to supply them. Because fossil fuels are mostly used for electricity production, affecting the increase in greenhouse gas emissions to the atmosphere, one of the real alternatives to compressor chillers is the adsorption chillers. To supply the adsorption chiller is used hot water having a temperature of 53 0C derived from solar collectors or waste heat from technical processes or water from the district heating network. These chillers are characterized by large dimensions and a low coefficient of performance. One way to increase their efficiency is to search for more efficient sorbents or increase the efficiency of heat exchange in the bed between the exchanger and the sorbent. The paper presents experimental possibilities for improving the efficiency of sorption processes within the bed by the use of metallic and non metallic additives materials. The experimental results described in work deals with a suitable amount of addition to the sorbent, which will provide the maximum increase in the thermal conductivity with minimal loss of sorption capacity. The tests were carried out using an apparatus for measuring dynamic vapor sorption of DVS Vacuum from Surface Measurement Systems. Experiments include studies of sorption kinetics for mixtures of sorbent with aluminum powders, carbon nanotubes and copper, graphite and other metallic additives at various share in the silica-based mixture, commercially used in absorption chillers. The results of experimental studies indicate a decrease in the amount of adsorbed steam with an increase in the mass share of the additives. At the same time, a larger amount of additive increases the thermal conductivity coefficient. The higher the thermal conductivity of the bed, the faster the adsorption and desorption processes take place, which directly translates into greater efficiency of the entire refrigerator.

Keywords: Silica gel, Thermal conductivity, Adsorption chiller, Coefficient of performance (COP), Kinetics sorption
Acknowledgment: This research was funded by subsidy Faculty of Energy and Fuels AGH University of Science and Technology number