Thermodynamics Assignment Questions

Thermodynamics Assignment Questions
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Question 1: Steam Nozzle
Absolute steam pressure = 275kPa
Steam quality = 0.95
Diameter of nozzle = 10mm
Mass flow rate = 11kg/hr
Steam pressure = 3Kpa
Velocity = 700m/s
Heat loss per unit volume = 50kJ/kg
The steam velocity at the inlet of nozzle

From first law, thermodynamics states that net energy change in any closed systems is zero (Dafermos, 2009).
W=0
Hin = Enthalpy at inlet of steam = 412kj/kg +0.95(521-412) = 515.55kJ/kg
Hout = Enthalpy of steam at outlet = 335+0.95(454-335) = 448.05Kj/kg
515+c22x9.81×11=448.05+11×7022×9.81+50
C = 20.37m/s
Quality of steam at exit
Hout= 448.05kJ/kg
448.05=312+x(467-312)
X= 0.9377
Question 2: Carnot Efficiency
Thermal temperature =90 degree Celsius
Rejection temperature =25 degree Celsius
(a) Thermal efficiency = TH-TCTH=90-2590=72.22%(b) Rate of delivering to environment = 2.2kW *0.7222= 1.59kW
Question 3: Air Compressor
Entry pressure = 100Kpa
Temperature at entry = 20 degree Celsius
Flow rate = 0.75m3/s
Exit pressure = 900kpa
Isentropic efficiency = 0.7
Exit temperature of air = x degree Celsius
hin = 514Kj/kg
Hin – Hout=0
0.7=514-378514-x
X= 319.71 kJ/kg
Temperature = temperature of air at 900kpa at 319.71kjkgfrom steam tables=47.8 degree celcius Power = Enthalpy*flow rate
Power = 514*0.075 = 38.55kW
Question 4: Turbine
Pressure at Entry = 1.2Mpa
Temperature at entry = 110 degree Celsius
Exit …