Heat Transfer T...

Which of the following is having the lowest value of overall heat transfer coefficient?

A cross-flow type air heater has an area of 50 cm². The overall heat transfer coefficient is 100 W/m² K and the heat capacity of both hot and cold streams is 1000 W/m K. The value of NTU is

An oil cooler in a high-performance engine has an outside surface area 0.12 m² and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m ² K. Find out the heat transfer rate?

Which of the following statement is incorrect according to heat transfer?

Consider a convective heat flow to water at 75 degree Celsius from a cylindrical nuclear reactor fuel rod of 50 mm diameter. The rate of heat generatioN is 50000000 W/m³ and convective heat transfer coefficient is I kW/m² K. The outer surface temperature of the fuel element would be

For a cylindrical rod with uniformly distributed heat sources, the thermal gradient at half the radius location will be

Water (specific heat = 4 k J/kg K) enters a cross flow exchanger (both fluids unmixed) at 15 degree Celsius and flows at the rate of 7.5 kg/s. It cools air (C _P = 1 k J/kg K) flowing at the rate of 10 kg/s from an inlet temperature of 120 degree Celsius. For an overall heat transfer coefficient of 780 k J/m² hr degree and the surface area is 240 m², determine the NTU

A heat exchanger to preheat oil for a furnace was designed without considering the possibility of scale formation, and the overall heat transfer coefficient based on the fuel oil side was 3200 k J/m² hr degree. What would be the corrected coefficient of heat transfer if a fouling factor of 0.00025 m² hr degree/k J for the fuel oil is taken into account?

Which of the following is the value of fouling factor for engine exhaust?

The value of fouling factor for industrial liquids is ______