numerical model to optimize the refrigerant charge for maximum refrigeration capacity
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ID: 159376
2013
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Abstract
Refrigeration systems require optimal amount of refrigerant for maximum
system performance. Undercharged or overcharged systems experience reduced
efficiency and accessories deterioration. Optimal amount of refrigerant to be
charged in a refrigeration system depends on the physical and thermal dynamic
properties of the evaporator and the refrigerant. This paper presents
formulation of a numerical model that can be used in determination of optimal
amount of refrigerant charged in a system for maximum cooling rate as hence
maximum system performance. Rayleigh’s method of dimensional analysis was
used obtain the relationship between the maximum cooling rates of direct
expansion evaporators as a function of thermodynamic properties of
refrigerant R-134a, Different sizes of evaporator were fitted in the
refrigeration system and charged with systematically varying amount of
refrigerant until a maximum cooling rate was determined. The variation of
pressures and temperatures both at the inlet and exit of the evaporator were
observed and analyzed. The cooling rate of the numerical model formulated was
compared with the cooling rate the actual physical refrigeration system. A
t-test of 95% confidence interval indicated no significance difference
between the numerical model, and the physical refrigeration system.
| Reference Key |
m.2013thermalnumerical
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|---|---|
| Authors | ;Wainaina Patrick M.;Njue Musa R.;Ogola Wilson O. |
| Journal | Nature |
| Year | 2013 |
| DOI |
10.2298/TSCI110428081W
|
| URL | |
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