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Read the following data for a NH3 based refrigeration plant and answer the questions
A single cylinder, single acting compressor bore and stroke : 16 cm and 24 cm
Speed : 110 RPM
The indicated mean effective pressure : 2.1 bar
Thepressure limits : 9.7262 bar and 2.6785 bar
The temperatures at entry and exit of condenser 38°C and 16°C
The mass flow rate of cooling water : 14 kg/min
The rise in temperature of water : 8°C
The mass of ice produced : 56 kg/hr @20°C
Pressure, bar
Saturation temperature
Enthalpy, h, kJ/kg
Specific heat, Cp, kJ/kg K
Liquid
Vapour
Liquid
Vapour
9.7262
24
313.11
1482.49
4.791
3.113
2.6785
-12
144.91
1447.91
4.545
2.482

Assume: Lice = 335 kJ/kg and Cp,water = 4.19 kJ/kg K
1)Find the compressor work, kW
a.
b.
c.
d.
2)COP
a.
b.
c.
d.
3)Mass flow rate of NH3, kg/min
a.b.c. d.
4)The refrigeration effect in kJ/kg
a.
b.
c.
d.
5)The quality of NH3 entering the compressor
a.
b.
c.
d.

poralla vinay , 6 Years ago
Grade 12th pass
anser 0 Answers
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