الفهرس 
REFRIGERATION:
RESULTS from REVIEW OF THE PREVIOUSOnly 14 pages are availabe for public view
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Abstract
The present thesis shows the experimental results which
indicate that the refrigeration system performance is strongly
related to the refrigerant mass charge. It also studies factors
affecting the mass of the refrigerant such as evaporator pressure,
condenser pressure and load.
from literature survey, the previous works showed the
different methods of the refrigerant mass charge evaluation. Also
showed the comparison among different refrigerants to
improve the performance of the refrigeration systems. By using
mathematical study, one of the previous researches showed the
relation between the refrigerant mass charge and the coefficient
performance.
The present study shows that the coefficient of performance
related to the refrigerant type, the refrigerant mass charge and
the charging conditions. The experimental results of the
refrigerants R22, R134a and R404A indicate that in the early
stage of the increase in the refrigerant mass charge, a sharp rise
the coefficient of performance was observed. The coefficient
performance reached the peak value at the optimal refrigerant
mass charge, and then decreased with further increase in the
refrigerant mass charge.