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: 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 NH₃, 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 NH₃ entering the compressor

a. 0.77

 b.0.79

 c.0.68

d. 0.9