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The isentropic efficiency of an ammonia, NH3, refrigeration plant is 0.88. The ammonia enters the compressor...

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Mechanical Engineering

The isentropic efficiency of an ammonia, NH3, refrigerationplant is 0.88. The ammonia enters the compressor as dry saturatedvapour at -16 ? and leaves the compressor in a superheated state at11.67 bar. The refrigerant is then condensed and undercooled by 4Kat constant pressure before being expanded at -16 ?.

(NEED TO USE STEAM TABLES FOR NH3, PLEASE ONLY ANSWER IFYOU HAVE A GOOD UNDERSTANDING OF REFRIGERTION)

a)Draw a schematic of the plant and the cycle on T-s and P-hcoordinates.

Calculate:

b (i) the superheat temperature at the exit of thecompressor

b (ii) the compressor work

b(iii) the refrigeration effect

b(iv) the coefficient of performance of the plant

b(v) the volume flow rate of the refrigerant measured at thecompressor inlet for a plant refrigeration capacity of 500kW.

DATA Assume that the cp of ammonia at 11.67 bar is 4.86kJ/kg

PLEASE DON'T JUST MAKE UP THE ANSWERS.

ANSWERS;

bi)118.1 oC

b(ii) 278.9 kJ/kg

b (iii) 1121.6 kJ/kg

b(iv) 4.02

b (v) 0.0493 m3 /s

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