Electrically heated draw batch furnaces are commonly used in the heat treatment industry. consider a draw batch furnace front made of a 20-mm thick steel plate with a thermal conductivity of 37 w/m·k. the furnace is situated in a room with surrounding air temperature of 20°c and an average convection heat transfer coefficient of 10 w/m2·k. if the inside surface of the furnace front is subjected to uniform heat flux of 5 kw/m2 and the outer surface has an emissivity of 0.30, determine the inside surface temperature of the furnace front in k. (round your answer up to 2 decimal places.) the stefan–boltzmann constant is 5.67 × 10-8 w/m2 . k4

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Find the kinematic pressure of 160kpa. for air, r-287 j/ kg k. and hair al viscosity of air at a temperature of 50°c and an absolute (10 points) (b) find the dynamic viscosity of air at 110 °c. sutherland constant for air is 111k