In a manufacturing facility, 2 in diameter brass balls (k 64 1 Btu h middot ft middot deg F, Iuml 532 lbm ft 3 , and c p 0 092 Btu lbm middot deg F) initially at 250 deg F are quenched in a water bath at 120 deg F for a period of 2 min at a rate of 120 balls per minute If the convection heat transf...

A number of brass balls are to be quenched in a water bath at a specified rate The temperature of th ...

In a manufacturing facility, 2-in-diameter brass balls (k = 64.1 Btu/h·ft·°F, Ï = 532 lbm/ft 3 ,

Question:

In a manufacturing facility, 2-in-diameter brass balls (k = 64.1 Btu/h·ft·°F, Ï = 532 lbm/ft³, and c_p= 0.092 Btu/lbm·°F) initially at 250°F are quenched in a water bath at 120°F for a period of 2 min at a rate of 120 balls per minute. If the convection heat transfer coefficient is 42 Btu/h·ft²·°F, determine

(a) The temperature of the balls after quenching

(b) The rate at which heat needs to be removed from the water in order to keep its temperature constant at 120°F.

Brass balls 250°F 120°F Water bath