Problem 3 - Air Conditioning ( An office building has a window air conditioner with a COP of 2 that consumes 2 kW of electricity. Computers, terminals, printers and other equipment are in the room with a total rate power of 8.4 kW. At any given time, 40% of the equipment is assumed to be operating. There are seven employees working in the building at any given time and each is assumed to generate heat at a rate of 100 W. The office building also gains heat due to direct solar heating at a rate of 3 kW during the middle of the day Is the window air conditioner large enough to meet the cooling load? If not, how many portable air conditioners that can remove heat at a rate of 7,000 Btu/h would be required to meet the cooling load? Be sure to draw a schematic, draw a control boundary and apply the first law to solve this problem. Do not consider the electricity consumed by the window air conditioner or other air conditioners when computing the load. Note that the cooling load is the total amount of heat an air conditioner must remove from a space.

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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.