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 K1)Find the compressor work, kWa. b. c. d.2)COPa. b. c. d.3)Mass flow rate of NH3, kg/min a.b.c. d.4)The refrigeration effect in kJ/kga. b. c. d.5)The quality of NH3 entering the compressora. b. c.d.
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
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.