Aplane layer of coal of thickness l = 1 m experiences uniform volumetric generation at a rate of q = 10w/m3 due to slow oxidation of the coal particles. averaged over a daily period, the top surface of the layer transfers heat by convection to ambient air for which h = 8 w/m2 ⋅ k and t[infinity] = 30°c, while receiving solar irradiation in the amount gs = 500 w/m2. irradiation from the atmosphere may be neglected. the solar absorptivity and emissivity of the surface are each α s = ε = 0.95.

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

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

Machinery that is a key part of the process and without which the plant or process cannot function is classifed as: (clo4) a)-critical machinery b)-essential machinery c)-general purpose machinery d)-none of the specified options.