Heat flux through wood board = 150 W/m² for temperature difference of 25°C between the two...
4.- The temperature inside a room is 25°C. There is a single glass window of 1 m. Outsid temperature is 4°C. The convective coefficient outside the room is 20 W/m-K, and inside the is 10 W/mK. In order to reduce a 90% the heat flux, it is possible to install a new window with double gli an air chamber between the glasses. Evaluate the thickness of the air chamber between glasses The thickness of the glasses is 2 cm Thermal...
Problem 4: Consider the heat exchanger design illustrated. Hot air flows at speed of r0.6 m/s through the center pipe. The center pipe has an outer diameter of D=7 cm and length 4-2 m Cold water flows at 20-25 cm3/s through a smaller helical pipe having an outer diameter d = 1 cm and wall thickness of mm. The helical pipe is wrapped around the center pipe to form a heat exchanger. The center pipe has a thermal conductivity of...
Consider a stainless steel spoon (k= 15.1 W/m·C) that is partially immersed in boiling water at 95°C in a kitchen at 25°C. The handle of the spoon has a cross section of about 0.2 cm x 1 cm and extends 18 cm in the air from the free surface of the water. The spoon loses heat by convection to the ambient air with an average heat transfer coefficient of h = 13 W/m2. Assuming steady one-dimensional heat transfer along the...
PLEASE ANSWER a,b,c Heat Conduction Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the...
A3. (a) According to Fourier's Law of thermal conduction, the heat flux through a solid is given by the solid's thermal conductivity k multiplied by the negative of the local temperature gradient. If the temperature in the solid is given by the function T(x, y, z)= 30e **(y2 + z), determine an expression for the heat flux through an internal surface with normal n=2i+j+2k [7 marks) (b) If f(t)=3sin ox and g(t)= 2 cos(@t++), determine the amplitude of the function...
Please answet the the questions in detail it belong to Heat and Mass transfer Question2 Marks 191 In the context of a finite difference scheme for a material of thermal conductivity k, use an energy balance to derive the nodal equation for an extemal side node (illustrated) which is: heated by an electrical heater (generating surface heat flux q, W/m), .and cooled by convection (of heat transfer Tm+1,n coefficient h, W/m'K) into an ambient of air temperature T mn A...
The main difference between heat and temperature is that heat is a measurement of the amount of? A. Thermal conductivity B. Power C. Energy D. None of the above
When using the apparatus from this experiment, the average heat flux at the heater surface is calculated to be 7.2 kW/m2 and the temperature difference between the heater surface and freestream fluid temperature is 70°C. Calculate the Nusselt number (assume thermal conductivity of air = 0.02587 W/m-K). Answer: 62.82
At what rate is heat lost through a 1.5 m x 3.0 m rectangular glass windowpane that is 0.4 cm thick when the inside temperature is 29 °C and the outside temperature is 8.0 °C? The thermal conductivity for the glass is 0.75 W/( m.Cº).
3 (c) Determine the Heat Flux through iron plate 900 mm thick whose one face is maintained at 190'c and other face at 20°c. Take thermal conductivity of iron K=215 w/m k (1 Marks)