Discuss the classification of heat exchangers.

Draw a diagram of the industrial sugar evaporation process in a multiple effect evaporator and explain its operation.

A composite wall consisting of five series layers of materials with different properties. Layer thickness, thermal conductivity of the layers and temperatures are shown on the figure. Based on Fourier's law for conduction, answer the following questions. 1. What are the main assumptions? 2. Drive an equation to calculate the heat transfer rate through the Composite wall? 3. Draw the thermal circuit through composite wall? 4. What are the value Ti? 5. What are the value Tj? 6. What are the value Tr? Givens: KA = 2 W/m. °C KB = 1 W/m.°C Kc= 5 W/m. °C Kp= 4 W/m. °C 100°C Ti 25°C Tj Tr А C D +2cm + 6 cm- -4 cm 4cm

A small sphere of reference-grade iron with a specific heat of 447 J/kg.K and a mass of 0.515 kg is suddenly immersed in a water-ice mixture. Fine thermocouple wires suspend the sphere, and the temperature is observed to change from 15 to 14 0C in 6.35s. The experiment is repeated with a metallic sphere of the same diameter, but of unknown composition with a mass of 1.263 kg. If the same observed temperature change occurs in 4.59s, what is the specific heat of the unknown material? An uninsulated steam pipe passes through a room in which the air and walls are at 25 0C. The outside diameter of the pipe is 70 mm and its surface temperature and emissivity are 200 0C and 0.8 respectively. What are the surface emissive power and irradiation? If the coefficient associated with free convection heat transfer from the surface to the air is 15W/m2.K. What is the rate of heat loss from the pipe? And the facilities manager wants you to recommend methods for reducing the heat loss to the room, and…

If  Se is dopped with As  it will produce a(n) __________ semiconductor with __________ conductivity compared to pure Se.   A. p-type, decreased   B. n-type, decreased   C. p-type, increased   D. n-type, increased   E. intrinsic, identical

What is the critical solution temperature?

The fastest mode of heat transfer is 1. Conduction 2. Radiation 3. Convection 4. all are equally fast