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An ideal vapor compression refrigeration cycle that uses R-134a maintains a pressure in the condenser of 1000kPa and the evaporator at 4 degree C. Determine: The systems coefficient of performance. The power required to service a 400kW cooling load. What would be the coefficient of performance if the compressor had and efficiency of 80%.
an electric hot plate is maintaned at a temperature of 350 and is used to keep the solution just boiling at 95. the
a three-blade helicopter blade rotates at 200 rpm. if each blade is 12 ft long and 1.5 ft wide estimate the torque
an electronic device such as a power transistor mounted on a finned heat sink can be modeled as a spatially isothermal
for an infiltration rate of 0.9 air changes per hour ach. a building 20m long 13m wide and 3m high is kept at 24
as part of a pollution study a model concentration c as a function of position x has been developedcx ae-x2a -
an aircraft is in level flight at 225 kmhr through air at standard conditions. the lift coefficient at this speed is
a given liquid has a temperature 178 celcius at a pressure of 47 mpa. if the enthalpy of the saturated liquid at the
you are designing an ex vivo artificial organ. the cells in the organ cannot tolerate shear stress in excess of 0.5 gcm
determine the heat transfer necessary to increase the pressure of 70 percent quality steam from 200 to 700 kpa
1 a 10-cm long and 20-cm wide circuit board is covered with 100 closely spaced chips each generating heat at a rate of
1 a 500 ml cylindrical mug is filled level with the top of the mug with 90degc water. what is the water level relative
a transistor in a stereoamplifier dissipates 0.4 w within a housing that is cylindrical radius 8 mm and height 8 mm.
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