A constant-pressure piston/cylinder assembly con- tains 0.2 kg of water as saturated vapor at 400 kPa. It is now cooled so that the water occupies half of the original volume. Find the work and heat trans- fer for the process.

Q: A chiller cools liquid water for air-conditioning purposes. Assume that 2.5 kg/s water at 20°C, 100…

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Q: posses for a carbon dioxide gas at 1958.76 C in kj/kg. use

A: R for CO2 =0.1889 T= 1958.76C = 2262K W= mRT m=1kg

Q: How much heat is in 30 kg of 90% dry steam at 1 250 kPa?

A: Dryness fraction is given 90% or 0.9 Find , heat or enthalpy at this point

Q: Thermodynamics problem. A 5m3 rigid container containing water of 80% quality and a pressure of…

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Q: A piston/cylinder assembly has 0.5 kg air that is currently in 2000 kPa, 1000K as shown in the…

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Q: A 2kg steam was in a piston cylinder with pressure of 1 MPa and 200°C.Heat transferred isobarically…

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Q: A piston cylinder has 2.2 kg of air at 300 K and 150 kPa. It is now heated up in a two step process.…

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Q: 3kg of Co2 expanded in a stationary piston cylinder through a polytropic process from 30 degree…

A: T1= 30+273= 303K, m=3kgP1=250KPa, P2=100KPan=1.45T2T1= 1002501.45-11.45=228.014KTotal Work, W=…

Q: of steam expands isentropically from 2.5mpa and 300 degrees to 0.95mpa.find the final quality

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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.