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An emergency situation developed as a result of the failure of the cooling system of a portable electronic device used in a helicopter. The device dissipates 102 watts and is mounted on a 3 cm x 3 cm copper plate which is 0.65 cm thick. This device is turned on only when the helicopter exceeds 70 mph. Reliability consideration requires that the temperature of the mounting surface does not exceed 92 C. Design a cooling system for this device as an emergency measure keeping in mind that no fans or circulating pumps are available. One engineer suggested taking advantage of a small 0.5 cm thick window to provide thermal communication with the ambient air.
a refridgerator should remove 500 kj from some food. assume the regriderator works in a carnot cycle between -10 and 45
determine the force in member of the loaded truss. assume that the four external reactions at and are equal in
the ocean thermal energy conversion otec power plant takes advantage of the temperature difference between ocean
water is pumped from a lake to a storage tank 20m above at a rate of 70ls while consuming 20.4kw of electrical power.
an engine operates on the air standard diesel cycle with inlet air conditions of 77 f and 14.5 psia. the compression
water backs up behind a concrete dam as shown. leakage under the foundation gives a pressure distribution under the dam
heat is transferred to a cylinder having a fixed volume of 6 m3 containing 0.1 m3 of saturated liquid water and 5.9 m3
A balloon behaves so the pressure is P = C2V1/3, C2 = 100 kPa/m. The balloon is blown up with air from a starting volume of 1 m3 to a volume of 3 m3. Find the final mass of air assuming it is at 25oC and the work done by the air.
a certain metal frame supports a platform and motor. the combined mass of the platform and motor is 600kg. at a motor
consider a combined gas-steam power plant. water for the steam cycle is heated in a well-insulated heat exchanger by
a closed system contains 2-kg of air undergoes an isothermal process from 600 kpa and 200oc to 80 kpa. determine the
the gases in the cylinder of an internal combustion engine have a specific internal energy of 800 kjkg and a specific
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