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A long, uninsulated steam line with a diameter of 89 mm and a surface emissivity of 0.8 transports steam at 200°C and is exposed to atmospheric air and large surroundings at an equivalent temperature of 20°C.
(a) Calculate the heat loss per unit length for a calm day.
(b) Calculate the heat loss on a breezy day when the wind speed is 8 m/s.
(c) For the conditions of part (a), calculate the heat loss with a 20-mm-thick layer of insulation (k = 0.08 W/m· K). Would the heat loss change significantly with an appreciable wind speed?
A paddle wheel and an electric heater operate in a system. If the torque is 200 N-m, the rotational speed is 400 rpm, the voltage is 20 V, and the amperage is 10 A, What is the rate of doing work?
Determine an appropriate footing size and layout if the service load from column A is 700 kips and from column B is 800 kips. Assume thickness and disregard reinforcing. The allowable soil pressure is 4000 psf.
Investigating A Dynamic Movement in Polar Coordinates
a compressor is used to bring saturated water vapor at 1 mpa up to 17.5 mpa where the actual exit temperature is
Write a memo to inform your instructor about your chosen topic.Write aconcise, one -page (single spaced)informative memoreport to your ENGL 250 instructor about this topic. In your report you should use the pyramid structure and address the follo..
consider a combined gass steam power plant that has a net power output of 450 mw. the pressue ratio of the gas turbine
The thermal efficiency of a general heat engine is 40 percent, and it produces a net work of 30hp. At what rate is heat transferred to this engine in kj/s?
A vehicle traveling at a constant speed v in the horizontal direction encounters a triangular road bump, as shown in Fig. 4.48. Treating the vehicle as an undamped spring-mass system, determine the response of the vehicle in the vertical direction..
a steam turbine has 7lbmmin of steam entering at 200psi600 degrees f and leaving at 1 psi with a quality of 90.a draw
An energy storage system is proposed to absorb ther- mal energy collected during the day with a solar col- lector and release thermal energy at night to heat a building. The key component of the system is a shell-and-tube heat exchanger with the s..
Determine the Biot number in order to support the lumped formulation. Solve the differential equation to find an expression for temperature as a function of time.
The velocity of the airstream was measured using a thermistor- based anemometer, and thermocouples were used to determine the temperatures of the airstream and the test-plate.
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