Year-round operation the solar powered hybrid adsorption-compression refrigeration cycle
Abstract
In our earlier papers a hybrid adsorption-compression refrigeration cycle was presented. The hybrid, two stages cycle is based only on the natural refrigerants: water and carbon dioxide. The main advantage of the hybrid cycle is that the carbon dioxide compression cycle is subcritical because during the year-round operation it is possible to maintain the condensing temperature below 20 oC. During the hot season, this is achieved by adsorption cooling, during cold seasons the wet cooling tower is sufficient. Already several years of experience, allowed to gather a considerable amount of measurement data. The refrigeration system is working in our laboratory constantly since 2013. In 2015 the adsorption system was upgraded by the manufacturer. In 2017 frequency inverter for wet tower fan controlling was introduced. The refrigeration chamber was used for tests with different content and operation of the refrigeration chamber (loading and unloading). The assumed CO2 evaporating temperature was -35 oC. The averaged for HT(High Temperature) part of the cascade (adsorption cycle only) COPHT=0.51 for the whole year 2018. This may be considered a very good performance.
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Author Biographies
Roman Duda received his MSc in Power Engineering (specialisation: power engineering systems and facilities) in 2012 from Institute of Thermal Power Engineering at the Faculty of Mechanical Engineering of Cracow University of Technology, after the work in iBros technic, has been a Researcher for the Institute of Thermal and Process Engineering at the Cracow University of Technology, where currently he works as assistant. His scientific interest is focused on issues related to the utilisation of renewable energy for cold production.
Piotr Cyklis received his MSc in Mechanical Engineering in 1984 at the Faculty of Mechanical Engineering of the Cracow University of Technology, and Professor title in 2010. Since 1984 has been a researcher at the CUT, Laboratory of Thermodynamics and Thermal Machines Measurements. Specialising in innovative anticlockwise cycles, thermal processes and volumetric compressors.
Copyright (c) 2020 Roman Duda, Piotr Cyklis
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