Water enters the bottom of a hot water heater in a home at a velocity of 1.25 ft/s, a temperature of 60°F, and a pressure of 45 psia. The fluid exits at a velocity of 1.00 ft/s, a temperature of 130°F., a pressure of 43 psia, and a height 5 ft higher than the entrance. Assuming no heat is wasted, determine the minimum amount of energy required in Btu/lbm. (Note 778 ft lb= 1 Btu)

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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.