This paper presents the simulation results and an overview of the performance of low capacity two stage half-effect absorption cooling system (10kW), suitable for residential and small building applications.
The primary heat source is solar energy supplied from flat plate collectors. The complete system (solar collectors-absorption cooling system) was simulated using a developed software program. The energy and exergy analysis is carried out for each component of the system. All exergy destructed that exist in this solar cooling system is calculated.
Critical temperatures which are the minimum allowable hot water inlet temperatures are determined. This system has shown promising characteristics. When the condenser temperature is fixed at 28°C, 32°C and 36°C it can be concluded that between time of day 10 and 14 solar collector provides about 96%, 95% and 91% heating energy required respectively with a cover of about 100% between time of day 11 and 13 which correspond to a maximum of solar radiation. The daily cover is about 71%, 70% and 65% respectively.
Nowadays world is marked with an intensive use of energy, cooling and air conditioning remains having the large share of energy consumption. Besides the energy consumption, climatic changes have become an international issue that was treated in many international summits (the last one was the United Nations Climate Change Conference Copenhagen–December 2009).
In this context, solar chilled water production through absorption cycles energy may be considered one of the most desirable applications to reduce energy consumption and CO2 gas emissions. The use of solar energy to drive cooling cycles for air conditioning is an attractive concept because of the coincidence of peak cooling loads with the available solar power.
Algeria, as well as most of other Arab countries, enjoys of solar radiations. During the summer, the demand for electricity greatly increases because of the use of vapour compression air conditioning system, which increases the peak electric load, and major problems in the country’s electric supply arise.
Solar energy can be used for cooling as it can assist in providing the heating energy for absorption cooling systems.
Author: Rabah Gomri