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Read the following data for a NH 3 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, C p , 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: L ice = 335 kJ/kg and C p,water = 4.19 kJ/kg K 1)Find the compressor work, kW a. 2.26 b. 1.86 c. 3.23 d. 2.65 2)COP a. 2.76 b. 2.42 c. 4.32 d. 3.51 3)Mass flow rate of NH 3 , kg/min a. 0.375 b. 1.23 c. 0.826 d. 2.642 4)The refrigeration effect in kJ/kg a. 1562.1 b. 1043.2 c. 2214.3 d. 883.2 5)The quality of NH 3 entering the compressor a. 0.77 b. 0.79 c. 0.68 d. 0.9

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.

Grade:12th pass

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