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A 15 cm x 20 cm hot surface at 85 degrees is to be cooled by attaching 4 cm long aluminum (k= 237 w/m degrees C) fins of 2 mm x 2 mm square cross section. The tempurature of surrounding medium is 25 degrees C and the heat transfer coefficent of the surfaces can be taken to be 20 W/m^2 degrees C. If it is desired to triple the rate of heat transfer from the bare hot surface, determine the number of fins that needs to be attached.
Water is the working fluid in a Rankine cycle. Superheated vapor enters the turbine 10MPa, 480 celcius, and the condenser pressure is 6kPa. The turbine and pump have isentropic efficiencies of 80 and 70% respectively.
Find the moment of inertia of th is combination about an axis perpend icular to the barthrough its center.
consider a 210mw steam power plant that operates on a simple rankine cycle. steam enters the turbine at 10mpa and 500oc
a 0.2 m3 rigid tank initially contains refrigerant 134a at 1 mpa saturated vapor. the tank is connected to a supply
Questions about balloon with camera launched in space... How can the angle with respect to north are measured. How can we make this system rotate physically while at high altitude? How can we measure the altitude of the system?
The mass flow rate through a steam turbine operating under steady conditions is 100 kg/s. Steam enters the turbine at 12 MPa and 400oC. A mixture of vapour and liquid water exits the turbine at 10 kPa. At the exit state 93% of the mass of the water i..
Assuming the analyses are accurate, what do they show about the ratio by weight of each of the three fractions actually obtained? What is the overall effectiveness of each screen?
a rigid tank has a volume of 0.06m3 and initially contains a two-phase liquid-vapour mixture of h2o at a pressure of 15
two identical and cfr computers are placed in a redundant configuration. if the system reliability is to be 0.95 at
Consider the number of significant figures in the standard deviations cited in the table. [s the number of digits justified in each case') Support your answer with statistical calculations.
a prototype 90 degree pipe elbow has ethyl alcohol at 20 degrees celsius flowing through it. the pressure drop through
a which bearing has higher starting torque rolling element bearing or journal bearing? justify your answer.b when
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