A radiator by steam is used to heat a closed room. Heat is lost from the room to the outside at a rate of heat transfer by Newton Law. The outside temperature of the room is Tout and dimensions of room are V. Saturated steam at PI condenses in the radiator and emerges as a liquid at the saturation temperature, Ts. The temperature inside the room at the initial radiator is turned on is Tin. The overall heat transfer coefficient between inside and outside room is U. The heat capacity of air to be constant is Cp. Write a differential energy balance on the room air.

Transport Phenomena Question

03: Air is contained in a vertical cylinder fitted with frictionless piston and a set of stops. The piston cross -sectional area is (0.2 m²) and the air inside is initially at (200 kPa, 500°C). The air is then cooled as a result of heat transfer to the surroundings. a) What is the temperature of the air inside the cylinder when the piston reaches the stops? b) The cooling is now contained until the temperature reaches (20°C), what is the pressure at this state? Ans. [a) 113.4 °C, b) 151.7 kPa] Air 0.25 0.25

A copper electric wire of radius R, = 1 mm is isolated by a layer of PVC so that the outer radius of the wire Rg = 2 mm, as shown in Figure below. The wire exchanges heat with the air at 20°C according to a heat transfer coefficient h=20 W/m2°c: Given that : k=copper electrical conductivity=4.0 × 1070hm-'m¯! kpvc= PVC thermal conductivity = 0.3- m°C kco = copper thermal conductivity = 100 m°C %3D (amp/m)² And that the electrical heating source is given by : S, amp²s /kgm³ If the temperature (T,) on the outer surface (r = RG) is 25°C, what is the electrical current C (amp) that passes through this wire? Dont forget to state your hypothesis clearly.     Hi, Could you please tell me what the book's name is? Thank you!

n-Hexane is burned with excess air. An analysis of the product gas yields the following dry-basis molar composition: 6.87% CO2, 1.16% CO, 0.539% C6H14 (with the remainder O2 and N2). The stack gas emerges at 760 mm Hg. Calculate the percentage conversion of hexane, the percentage excess air fed to the burner, and the dew point of the stack gas, taking water to be the only condensable species. a. What is the percent conversion of n-hexane? b. What is the percentage by which air is fed in excess? c. What is the dew point of the stack gas (assuming that water is the only condensable species)?