A long, 20-cm diameter pipe is carrying hot water. The temperature of the air around the pipe is10°C. The velocity of air is 2.2 m/s. The temperature of the pipe's surface, which is isothermal, is80°C. What is the average convection coefficient of the airflow around the pipe?12.3 W/m2-K To control the aeration and the temperature, a composting plant stores compost in tall 1-m diametercylindrical heaps. These compost cylinders are exposed to air at 20°C. The thermal conductivity ofthe compost heap is 1.12 W/m-K. The air around the compost has an average convection coefficientof 8 W/m2.K. The compost generates heat uniformly at 400 W/m³. Neglect any heat transfer from thetop and bottom surfaces of the heap and neglect radiation. what is the surface temperature of thecompost heap under steady conditions?32.5 C

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A long, 20-cm diameter pipe is carrying hot water. The temperature of the air around the pipe is 10°C. The velocity of air is 2.2 m/s. The temperature of the pipe's surface, which is isothermal, is 80°C. What is the average convection coefficient of the airflow around the pipe? 12.3 W/m2-K

A long, 20-cm diameter pipe is carrying hot water. The temperature of the air around the pipe is 10°C. The velocity of air is 2.2 m/s. The temperature of the pipe's surface, which is isothermal, is 80°C. What is the average convection coefficient of the airflow around the pipe? 12.3 W/m2-K

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.25P: Show that the rate of heat conduction per unit length through a long, hollow cylinder of inner...

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Question

A long, 20-cm diameter pipe is carrying hot water. The temperature of the air around the pipe is
10°C. The velocity of air is 2.2 m/s. The temperature of the pipe's surface, which is isothermal, is
80°C. What is the average convection coefficient of the airflow around the pipe?
12.3 W/m2-K

To control the aeration and the temperature, a composting plant stores compost in tall 1-m diameter
cylindrical heaps. These compost cylinders are exposed to air at 20°C. The thermal conductivity of
the compost heap is 1.12 W/m-K. The air around the compost has an average convection coefficient
of 8 W/m2.K. The compost generates heat uniformly at 400 W/m³. Neglect any heat transfer from the
top and bottom surfaces of the heap and neglect radiation. what is the surface temperature of the
compost heap under steady conditions?
32.5 C

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