Afreezer compartment is covered with a 3-mm-thick layer of frost at the time it malfunctions. if the compartment is in ambient air at 20°c and a coefficient of latex: h=\: 2\: \frac{w}{m^2.k}h = 2 w m 2 . k characterized heat transfer by natural convection from the exposed surface of the layer, estimate the time required (in seconds) to completely melt the frost. the frost may be assumed to have a mass density of 700 latex: \frac{kg}{m^3}k g m 3 and a latent heat of fusion of 334 kj/kg.

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

Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation