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The Weather Channel reports that it is a hot, muggy day with an air temperature of 90°F, a 10 mph breeze out of the southwest, and bright sunshine with a solar insolation of 400 W/m2. Consider the wall of a metal building over which the prevailing wind blows. The length of the wall in the wind direction is 10 m, and the emissivity is 0.93. Assume that all the solar irradiation is absorbed, that irradiation from the sky is negligible, and that flow is fully turbulent over the wall. Estimate the average wall temperature.
Determine the maximum horizontal displacement s of the block. Each of the two springs has a stiffness of k = 2500N/m and an unstretched length of 0.15 m.
a composite requiring a tensile modulus of 25 gpa is to be made from a matrix of density 960 kgm-3 having a tensile
1 what cooling air flow rate would be required to maintain a space at 72 degrees f if it had a sensible cooling load of
Calculation of percentage heat reduction, Water at 90 C flows through a 50mm bore steel pipe of wall thickness 8 mm. Ambient temperature is 18 C. Calculate the heat loss per metre length of pipe
2.49 kg of R-134a refrigerant fill a .26098 m^3 rigid container at an initial temperature of -26°C. The container is then heated until the pressure is 200 kPa. Determine (a) the final temperature and (b) the initial pressure.
a refrigerant 134a at 140 kpa and -10 degree celcius is compressed by an adiabatic 16kw compressor to an exit state of
If the outer surface of the wall is heated to a temperature T1 > Tf to melt the ice, obtain an expression for the time needed to melt the entire mass of ice and, in turn, deliver cooling water to, and energize, the fuel cell.
a steady flow compressor is used to compress air from 1 atm 25ordmc to 8 atm in an adiabatic process. the compressor
The bicycle and rider start from rest at the top of the hill. Show how to determine the speed of the rider when he freely coasts down the hill. Use appropriate dimensions of the wheels, and the mass of the rider, frame and wheels of the bicycle to..
a 1-mm-thick bcc iron foil is used to separate a region of high nitrogen gas concentration of 0.1 atomic percent from a
A 20 horsepower, three-phase squirrel cage induction motor has a NEMA code B. The motor is connected to 208 volts. What is the starting current for this motor?
If the room temperature is 300. K, what mass of ice can be produced in one day by a 0.50-hp motor that is running continuously? Assume that the refrigerator is perfectly insulated and operates at the maximum theoretical efficiency.
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