| dc.description.abstract | The project consisted of the design, construction, and
testing of an exclusively solar oper ated refrigeration unit.
direct application of solar energy to refrigeration involved
the use of an intermittent absorption refrigeration system.
Design specifications were :
1\8 ton of refrigeration at - 20°C evaporator temperature~
refrigeration process to last 3 hours. ambient temperature
variation from 20°C to 35°C. minimum generation period of
3 hours. For the unit, the design procedure to meet system
specifications have been explained, and component fabrication
processes outlined.
Due to availability of ammonia gas,amonia-water combinations
of concentrations ranging from 0.48 to 0.70 were
used. Tests were carried out to measure the refrigeration
temperatures obtainable , when a solar concentrator is used,
for an all solar simple absorption refrigeration unit having
an air cooled condensor and absorber. Tests were initially
carried out with electrical heating to simulate solar
insolation. In some of these tests, a constant power was applied throughout the Generation period whereas in others,
• the power was varied during experimentation, Later, actual
generation with solar insolation was carried out, and' the
results of the two compared.
System parameters during refrigeration and regeneration processes were measured and the cooling effect computed and discussed
poor rectification, low values of solar intensities
poor vapour condensation together with non-provision of auxiliary equipment on the unit e.g pumps e.t.c were noted as setbacks to reasonable system performance improvements to such systems been recommended | en |
