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i) An engine that in one cycle absorbs 5000 J of heat and rejects 4500 J of heat;
ii) An engine that in one cycle absorbs 25000 J of heat and does 2000 J of work;
iii) An engine that in one cycle does 400 J of work and rejects 2800 J of heat
A room designed to house around 54 individuals at once needs a cooling system. The cooling units available in the market have a capacity of 3 kilowatts. Assume that one individual radiates heat at roughly 350 kilojoules per hour. The room also has twelve 100 W bulbs. The room is to be maintained at 20 degree celsius but at this temperature Some 13500 kJ/h amount of heat also enters through the wall. Find the
a. The net heat transfer rate for the room in kW
b. The number of cooling units required
Hint: Some rounding off might be necessary
The schematic shows a steam power plant in which the turbine develops 1050 kW. The heat supplied to the steam in the boiler is 5040 kJ/kg, the heat rejected by the steam to the cooling water in the condenser is 3780 kJ/kg and the feed pump work required to pump the condensate back into the boiler is 6 kW.
Calculate:
a. the steam flow rate in kg/s.
b. The amount of heat transferred for 10 kg of steam. Follow your book’s sign convention.
Calculate the change in internal energy of the working fluid stating whether it is a gain or loss.
#340153 on Dec 2023