Which is a more valuable resource for work production in a closed system –15 ft3 of air at 100 psia and 250°F or 20 ft3 of helium at 60 psia and 200°F? Take T0 = 77°F and P0 = 14.7 psia.

Q: Air is compressed by an adiabatic compressor from 95 kPa and 27°C to 600 kPa and 277°C. Assume…

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Q: Two rigid tanks are connected by a valve. The left tank is filled with 8.6 ft of air initially at 22…

A: Given Pressure, PA = 22 psia               PB = 17.3 psia Volume, VA = 8.6 ft3               VB =…

Q: Helium gas (C,=5.19 kJ/kgK, k=1.67) is compressed steadily from 100 kPa and 30°C to 600 kPa at a…

A: The given values are - P1= 100kPa, T1 =30°C =303 K, P2= 600kPaη=0.6 , k=1.67 , Cp=5.19 kJkgKFor an…

Q: Superheated steam enters turbine at 360 oC and 500 kPa and exits at 8 kPa. Calculate the state at…

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Q: 2. What is the entropy change of the water, the oven and the universe (in kJ/K) when 1 kg of liquid…

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Q: The adiabatic compressor in a refrigerator compresses saturated R-134a vapor at -10.0°F to 200 psia.…

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Q: Is the relation Δh = mcp,avgΔT restricted to constantpressure processes only, or can it be used for…

A: Rewrite the given relation. Here, m is the mass of the gas, cp,avg is the average of specific heats…

Q: (2) A well-insulated 114 m room initially at 4°C and 90 kPa is heated by the radiator of a steam…

A: Given:-              v = 1143T = 4° CP = 90 kPa100 kPa after 146 mm      40 L From the steam table…

Q: (2) A well-insulated 106 m³ room initially at 3°C and 88 kPa is heated by the radiator of a steam…

A: Given that, Volume of isulated room, v=106 m3Initial temperature, T1=3 °C,Initial Pressure, P1=88…

Q: A turbine takes in steam at 550 degrees Celsius and 15 MPa and releases steam at 250 degrees Celcius…

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Q: One lbm of R-134a is expanded isentropically in a closed system from 100 psia and 100°F to 10 psia.…

A: Here we will refer to the refrigerant table to get the values of internal energy and entropy and use…

Q: 17. A piston-cylinder device with a set of stops initially contains 0.3 kg of steam at 1.0 MPa and…

A: Given:m=0.3 KgP1=1.0 MPav1=0.30661 m3/Kgv2=0.6*v1h2=2950 KJ/Kg

Q: The compressor of a refrigerator compresses saturated R-134a vapor at –10°C to 800 kPa. How much…

A: Plot the T-s diagram for a better understanding of the problem. Write the properties of the steam…

Q: Helium gas expands from 150 kPa, 450 K and 0.5 m3 to 100 kPa in a polytropic process with n = 1.667.…

A: Data given-  P1 = 150 kPa  T1 = 450K  V1 = 0.5 m3  P2 = 100 kPa  n = 1.667

Q: pom has a 250 W re c resistance heater. iCe it is observed t

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Q: maximum amount of power in kW

A: Given: Geothermal power plant mass of pressurized ground water=1,500,500 kg/hr P1=620 F P2=250 psi…

Q: Air is compressed in an adiabatic compressor from 75 psia and 660 R to 290 psia and 1320 R.…

A: Given   Initial pressure, P1 = 55 psia    Final pressure, P2 = 270 psia Find  Isentropic efficiency

Q: An adiabatic compressor compressed steam from 4 MPa and 300 °C to 9 MPa isentropically. What is the…

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Q: s by an adiabatic compressor. If the isentropic efficiency of the compressor is 60%, deteri

A: given data  cp= 5.19 kj/kg k=1.67 p1 = 100 kpa p2 = 600 KPa T1 = 30 degree centrigate compressor…

Q: .2 kg/min of air (R=0.287, Cp=1.0062 kJ/kg.K and k =1.4) are compressed isothermally from 30 deg C…

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Q: (2) A well-insulated 114 m room initially at 4°C and 90 kPa is heated by the radiator of a steam…

A: Let m= mass of air  cv=specific heat of air at constant volume=0.718KJ/kgK T=Temp. of air before…

Q: At 3MPa and 400C, 2 kg/s steam flows into a turbine. It exits at 300kPa. The turbine has an…

A: Given: P1 = 3 MPa = 3000 kPa P2 = 300 kPa T1 = 400 C efficiency = 85% Ideal case means isentropic…

Q: Consider a two-part process with an expansion from 0.1 to 0.2 m' at a constant pressure of 150 kPa…

A: Draw all the processes on a P-V diagram.

Q: que iswer is submited, you will be unable to return to this part. Air is compressed in a…

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Q: Consider the system shown in the figure. When the pins fall away, the gas expands against a constant…

A: Number of moles of the gas, n=10  Initial pressure Pi= 5atm External Pressure Pext = 1 atm T = 300 K…

Q: a turbine at 1100 kpa , dry and saturated . The steam is exhausted from the turbine at 200 kpa and…

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Q: Helium (R=0.4968 BTU/lbm-R) is compressed isothermally from 14.7 psią and 68°F. The compressed…

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Q: Twokg of saturated water vapor at 600 kPa are contained in a piston–cylinder device. The water…

A: Given: The initial pressure is P1= 600 KPa. The pressure at expansion is P2= 100 KPa. The…

Q: A schematic of a steam power plant is shown in the figure. The boiler volume is 50 liter and…

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Q: An ideal gas (R= 0.2081 kJ/kgK, Cp=0.5203 kJ/kgK, Cv=0.3122 kJ/kgK) is compressed steadily from 100…

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Q: psia to a saturated steam with a quality of  x= 93% in an isentropic process.  What is the pressure…

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Q: Refrigerant-134a enters an adiabatic compressor at -26°C as a saturated vapor at a rate of 0.45…

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Q: Air is compressed in an adiabatic compressor from 55 psia and 660 R to 270 psia and 1200 R.…

A: Given   Initial pressure, P1 = 55 psia    Final pressure, P2 = 270 psia Find  Isentropic efficiency

Q: Helium (R=0.4968 BTU/lbm-R) is compressed isothermally from 14.7 psia and 68°F. The compressed…

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Q: Steam at 4 MPa and 350°C is expanded in an adiabatic turbine to 125 kPa. What is the isentropic…

A: Given:The steam enters at pressure is the entrance temperature is the exit pressure is

Q: Ten lbm of R-134a is expanded without any heat transfer in a closed system from 120 psia and 100°F…

A: Given Data  Properties of R-134a (table) At state 1 ( Before isentropic process) P1=120 psia…

Q: NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to…

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Q: A turbine takes in 550 degrees Celsius (13 MPa) steam and produces 1750 kW rate of work at 80% steam…

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Q: One lbm of R-134a is expanded isentropically in a closed system from 100 psia and 100°F to 10 psia.…

A: Given R-134a Internal pressure = 100 psia Temperature = 100o F Minimum pressure = 10 psia Mass = 1…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.