Q1:: A- The absolute pressure in water at a depth of 5 mis read to be 145 kPa. Determine theabsolute pressure at a depth of 5 m in a liquid whose density 900 kg/m3 at the same location?B- A 650 MW thermal power plant has an overall efficiency of 43% consumped natural gas fuel(heating value-45 MJ/kg).Calculate the saving in fuel when the fuel type change to gasoil (heatingvalue=50 MJ/kg) in kg/hr.Q2 A perfect gas is contained in a rigid vessel at 2 bar and 315°C is cooled at constant volume topressure of 1 bar ,and then expanded isothermally until the pressure falls to 0.5 bar; the gas hasa molar mass of 26 kg/kmol and value of y=1.37.Calculate the net work and heat transferred perunit mass.Q3: - In a gas turbine installation, the gases enter the turbine at the rate of 5 kg/s with a velocity of50 m/s and enthalpy of 900 kJ/kg and leave the turbine with 150 m/s and enthalpy of 400 kJ/kg. Theloss of heat from the gases to the surroundings is 25 kJ/kg. Assume R = 0.285 kJ/kgK, Cp 1.004kJ/kgK and inlet conditions to be 100 kPa and 27 •C. Determine the diameter of the inlet pipe.Q4 A-Answer false or true and correct:1. When a closed system undergoes a process between two specified states, the change intemperature between the end states is dependent of details of the process.2. If the volume of a given mass of a gas is doubled without changing its temperature the pressureof the gas is Reduced to 1/4of the initial value3. Volume is an intensive property of a thermodynamic system.4. The heating and expanding of a gas is called thermodynamic states.5. An increase in enthalpy leads to an decrease in internal energy.B- The gas in an internal combustion engine initially at temperature of 1400°C expandspolytropically to five times its initial volume and( 1/7) its initial pressure. Calculate1-The index of expansion n.Q5: A-Steam enters a turbine with a velocity of 47 m/s and specific enthalpy 2690 kJ/kg. the steamleaves the turbine with a velocity of 25 m/s and specific enthalpy 1200 kJ/kg. the heat lost tothe surroundings as the steam passes through the turbine is 25 kJ/kg .the steam flow rate is32400kg/h determine the work output from the turbine in kilowatts.B- 0.016 m' gas at a pressure of 3.070 Kpa expands to a pressure of 0.00207 bar according tothe law pV-C.Determine a- the final volume b- the work heat transferred during theexpansion. Take (the molecular weight of the gas =28 and specific heat at constant volume-0.866 kJ/kg .K).

Answered: Image /qna-images/answer/5244ebd1-f94b-419d-a78e-80ba19e02c3e.jpg

QI:: A- The absolute pressure in water at a depth of 5 m is read to be 145 kPa. Determine the absolute pressure at a depth of 5 m in a liquid whose density 900 kg/m3 at the same location? B- A 650 MW thermal power plant has an overall efficiency of 43% consumped natural gas fuel (heating value-45 MJ/kg).Calculate the saving in fuel when the fuel type change to gasoil (heating value=50 MJ/kg) in kg/hr. Q2 A perfect gas is contained in a rigid vessel at 2 bar and 315°C is cooled at constant volume to pressure of 1 bar ,and then expanded isothermally until the pressure falls to 0.5 bar; the gas has a molar mass of 26 kg/kmol and value of y-1.37.Calculate the net work and heat transferred per unit mass.

QI:: A- The absolute pressure in water at a depth of 5 m is read to be 145 kPa. Determine the absolute pressure at a depth of 5 m in a liquid whose density 900 kg/m3 at the same location? B- A 650 MW thermal power plant has an overall efficiency of 43% consumped natural gas fuel (heating value-45 MJ/kg).Calculate the saving in fuel when the fuel type change to gasoil (heating value=50 MJ/kg) in kg/hr. Q2 A perfect gas is contained in a rigid vessel at 2 bar and 315°C is cooled at constant volume to pressure of 1 bar ,and then expanded isothermally until the pressure falls to 0.5 bar; the gas has a molar mass of 26 kg/kmol and value of y-1.37.Calculate the net work and heat transferred per unit mass.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter1: Heat, Temperature, And Pressure

Section: Chapter Questions

Problem 14RQ: Atmospheric pressure at sea level under standard conditions is ______inches of mercury (Hg) or_____...

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