A 2-kW baseboard electric resistance heater in a vacant room is turned on and kept on for 15 min. The mass of the air in the room is 75 kg, and the room is tightly sealed so that no air can leak in or out. The temperature rise of air at the end of 15 min is (a) 8.5°C (b) 12.4°C (c) 24.0°C (d) 33.4°C (e) 54.8°C

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Q: 0106 m³/ kg. v=0.8908

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Q: A piston cylinder device initially contains 0.8 m3 of air at 110 psi and 80°C. The air is now…

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Q: The boiler of a steam generator has a total volume of 2 m3, and initially contained 1.5 m3 of water…

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Q: Convert enthalpy value of 247 Btu/lbm to kJ/kg

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Q: An insulated rigid tank initially contains saturated liquid water at 200°C. At this state,  only 25%…

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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.