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Wednesday, 11 March 2015

Advantages and Disadvantages of Cascade Refrigeration System

Advantages and Disadvantages of Cascade Refrigeration System Points : advantages and disadvantages of cascade refrigeration system Advantages
  1. It also reduces the lubricating problems since the lubricant associated with each, refrigerant has to withstand a temperature range not more than 60°C whereas in multistage system, the lubricant can have to be working over temperature range of order of 105°C.
  2. Performance of cascade system can be improved through reducing temperature difference for heat transfer in the evaporator, condenser and cascade condenser, compare to larger compressors.
  3. The performance of cascade system can be enhanced by reducing the temperature difference for heat transfer in evaporator, condenser and cascade condenser, and compare to larger compressors.
  4. It avoids the problem of sub-atomic pressure which will octet in the evaporation if a single fluid is used in both the stages.
  5. Using a cascade system power consumption can be reduced through about 9.5 %
Disadvantages
  1. In addition, it is found that at low temperatures, superheating (useful or useless) is detrimental from volumetric refrigeration effect point-of-view, hence in cascade systems, the superheat should be just enough to prevent the entry of liquid into compressor, and no more for all refrigerants.
  2. In definite systems a temperature difference between the condensing and evaporating refrigerants has to be provided in the cascade condenser, which leads to loss of efficiency.
  3. Compressors have low efficiencies for large pressure differences; this results in low system efficiency.
  4. Higher efficiency results but also a higher first cost.
  5. The large temp difference requires a large pressure difference.

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