Two plane coaxial disks are separated by a distance L = 0.80 m. The lower disk (A1) is solid with a diameter Do = 0.80 m and a temperature T1 = 300 K. The upper disk (A2), at temperature T2 = 900 K, has the same outer diameter but is ring-shaped with an inner diameter Di = 0.40 m. Assuming the disks to he blackbodies, calculate the net radiative heat exchange between them.

What precautions should you take to prevent injuries when dealing with heavy loads?

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa