Open AccessINCREASING THE WORKING EFFICIENCY OF SOLAR POWER ABSORPTION REFRIGERATOR UNITS
Author(s) -
M. F. Rudenko,
Yu. V. Shipulina,
M. Sh. Karimov,
Alexandra Mikhailovna Rudenko
Publication year - 2020
Publication title -
vestnik dagestanskogo gosudarstvennogo tehničeskogo universiteta. tehničeskie nauki
Language(s) - English
Resource type - Journals
eISSN - 2542-095X
pISSN - 2073-6185
DOI - 10.21822/2073-6185-2019-46-4-32-41
Subject(s) - refrigerator car , absorption refrigerator , materials science , solar energy , nuclear engineering , absorption (acoustics) , selective surface , coefficient of performance , cooling capacity , generator (circuit theory) , mechanical engineering , process engineering , heat exchanger , power (physics) , thermodynamics , optoelectronics , composite material , electrical engineering , refrigeration , refrigerant , engineering , physics
Objectives .The aim of the study is to develop a cyclic absorption refrigerator unit that implements technology for producing cold from solar radiation energy. Its distinctive feature comprises a highly developed solar receiving unit, consisting of two parallel-connected absorber generators whose reactors are installed in individual heat-insulated “hot box” cabinets. Method . The geometric characteristics of the absorber generator are based on the calculations of the optical and heat energy efficiency of the device models. Results . The physicochemical characteristics of activated carbons (AC) of various production are studied. The absorption capacity of the following working pairs is determined: AC-ammonia, AC-methylamine, AC-ethylamine. The calculated coefficients for the Dubinin-Radushkevich structural equations are obtained. An experimental solar energy refrigerator unit is tested using a working pair of AC-ammonia in an open test area. The operability of the upgraded device is proven. Exergetic coefficient dependencies are determined according to the developed software algorithm based on a simplified thermodynamic cycle. The areas of possible application and use of solar power refrigerator units with the studied working pairs are determined. Conclusion . The increased unit efficiency consists in the optimal layout of all elements of the absorber generator, including the reactor, two flat mirror concentrators, a thermal substrate, a reduced internal air space volume, a double-glazed window made of two sheets of glass and a calculated thickness of heat-insulating Ripor foamed polyurethane.