The Student Room Group

Anyone good on heat transfer problems?

A cast iron central heating pipe has an inner diameter of 100mm and a wall thickness of 5mm. The pipe feeds a radiator with water temperature 85°C and the inner wall temperature of the pipe is assumed to be equal to the water temperature. The thermal conductivity of cast iron is 52W/mK and the outer surface heat transfer coefficient is 20 W/mK. Calculate the surface temperature of the pipe and the heat transfer rate per metre of pipe in a room ambient temperature 19°C.
Seeing as you know the heat transfer coefficient you can calculate the surface temperature of the pipe using the conduction formula - just rearrange it. Then, calculate the amount the surface area of a 1m long pipe of OD 110mm and use that value as the area for the Newton's law of cooling.

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you