16-08-2012, 02:29 PM
Design and Simulation of an Absorption Diffusion Solar Refrigeration Unit
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Abstract:
The purpose of this study was the design and the simulation of an absorption
diffusion refrigerator using solar as source of energy, for domestic use. The design holds
account about the climatic conditions and the unit cost due to technical constraints imposed by
the technology of the various components of the installation such as the solar generator, the
condenser, the absorber and the evaporator. Mass and energy conservation equations were
developed for each component of the cycle and solved numerically. The obtained results
showed, that the new designed mono pressure absorption cycle of ammonia was suitable well
for the cold production by means of the solar energy and that with a simple plate collector we
can reach a power, of the order of 900 watts sufficient for domestic use.
INTRODUCTION
If the solar energy possesses the advantage to be
"clean", free and renewable, this last is probably,
considered like an adapted potential solution, that
answers in even time at a economic preoccupation and
ecological problems.
Among the main done currently research is the use
of this free source to make operate system of
refrigeration.
The diffusion absorption refrigerator cycle
invented in the 1920s is based on ammonia (refrigerant)
and water (absorbent) as the working fluids together
with hydrogen as an auxiliary inert gas[1,2]. Since there
are no moving parts in the unit, the diffusion absorption
refrigerator system is both quiet and reliable. The
system is, therefore, often used in hotel rooms and
offices[3].
CONCLUSION
A design and simulation of an absorption diffusion
refrigerator using solar as source of energy, for
domestic use was done and the system performances
were analyzed parametrically by computer simulation.
It appears that best performance in terms of COP would
be obtained when we work with low generator
temperature and high pressure. In the other hand, the
values of COP remain weak and depend of the power
solar babble pump.