2-: Consider a house with a floor space of 200 m2 and an average height of 3 m at sea level, where the standard atmospheric pressure is 101.3 kPa. Initially the house is at a uniform temperature of 10°C. Now the electric heater is turned on, and the heater runs until the air temperature in the house rises to an average value of 22°C. Determine how much heat is absorbed by the air assuming some air escapes through the cracks as the heated air in the house expands at constant pressure.

Q: The vapor pressure of water at 100°c is 101.3 kPa. If the vapor pressure is 1.23 kPa at 10°c, what…

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Q: Saturated water vapor is contained in a rigid container. Its energy is then increased until the the…

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Q: Saturated water vapor is contained in a rigid container. Its energy is then increased until the the…

A: According to the given data P2=161.990 kPa T2=400°C V1=V2  { Rigid tank } We need to find Initial…

Q: 3-34 10 kg of R-134a fills a 1.115 m³ rigid container at an initial temperature of -30°C. The…

A: Given : The mass of refrigrant is The  volume is The initial temperature is The final pressure is

Q: A piston/cylinder assembly with a spring contains 0.075 kg of water. The piston is initially resting…

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Q: A 1-m3 rigid volume contains water at 90°C with a quality of 0.8. Determine the final temperature if…

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Q: A frictionless piston-cylinder device initially contains 200L of saturated liquid refrigerant-134a.…

A: 1. Given, V1=200LP1=P2=900KPaT2=70°CFrom the steam table Properties of refrigerant R-134a at…

Q: Pressure of a gas changes from 20 to 120psia according to the relation P = aV + b, where a = 5.2…

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Q: A rigid 0.5 m³ tank initially contains saturated liquid water at 200°C. A valve on the bottom of the…

A: Given: The volume of the tank, V = 0.5m³ The temperature of saturated liquid water, Tsat = 200ᵒC The…

Q: Water in a rigid container has a pressure of 1000 kPa and specific volume of 0.1 m3/kg . The quality…

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Q: A piston/cylinder assembly with a spring contains 0.1 kg of water. The piston is initially resting…

A: Assumptions: For all states air behave as an ideal gas.Find:14Solution: State 1: P1 = 150 kPa, T1 =…

Q: A motorist equips his automobile tires with a relief-type valves so that the pressure inside the…

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Q: In this example, water is contained in a rigid container with a tight fitting lid. With a pressure…

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Q: Steam is contained in a 2-L volume at a pressure of 2.0 MPa and a temperature of 400°C. If the…

A: Givenvolume of the steam v=2ltr=2×10-3 m3pressure, P=2MPatemperature T=400oCheat added Q=20kJ

Q: In the figure below a piston is free to move and will not exit the cylinder. Initially the cylinder…

A: Given Data Mass of air at state 1 is :m=2 kg Initial pressure is : P1=1.5 bar Initial temperature…

Q: 3–31 10 kg of R-134a fill a 1.115-m³ rigid container at an initial temperature of –30°C. The…

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Q: A piston/cylinder assembly with a spring contains 0.1 kg of water. The pistor is initially resting…

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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.