Pressurized water is often available at elevated temperatures and may be used for space heating or industrial process applications. In such cases it is customary to use a tube bundle in which the water is passed through the tubes, while air is passed in cross flow over the tubes. Consider a staggered arrangement for which the tube putside diameter is 16.4 mm and the longitudinal and transverse pitches are SL = 34.3 mm and ST = 31.3 mm. There are seven rows of tubes in the airflow direction and eight tubes per row. Under typical operating conditions the cylinder surface temperature is at 70°C, while the air upstream temperature and velocity are 15ºC and 5 m/s, respectively. Determine the air-side convection coefficient and the rate of heat transfer for the tube bundle. What is the air-side pressure drop? SOLUTION Known: Geometry and operating conditions of a tube bank.
Pressurized water is often available at elevated temperatures and may be used for space heating or industrial process applications. In such cases it is customary to use a tube bundle in which the water is passed through the tubes, while air is passed in cross flow over the tubes. Consider a staggered arrangement for which the tube putside diameter is 16.4 mm and the longitudinal and transverse pitches are SL = 34.3 mm and ST = 31.3 mm. There are seven rows of tubes in the airflow direction and eight tubes per row. Under typical operating conditions the cylinder surface temperature is at 70°C, while the air upstream temperature and velocity are 15ºC and 5 m/s, respectively. Determine the air-side convection coefficient and the rate of heat transfer for the tube bundle. What is the air-side pressure drop? SOLUTION Known: Geometry and operating conditions of a tube bank.
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Transcribed Image Text:EXAMPLE 7.7
Pressurized water is often available at elevated temperatures and may be used for space heating or industrial process applications. In such cases it is customary to use
a tube bundle in which the water is passed through the tubes, while air is passed in cross flow over the tubes. Consider a staggered arrangement for which the tube
outside diameter is 16.4 mm and the longitudinal and transverse pitches are SL = 34.3 mm and ST = 31.3 mm. There are seven rows of tubes in the airflow direction
and eight tubes per row. Under typical operating conditions the cylinder surface temperature is at 70°C, while the air upstream temperature and velocity are 15°C and
6 m/s, respectively. Determine the air-side convection coefficient and the rate of heat transfer for the tube bundle. What is the air-side pressure drop?
SOLUTION
Known: Geometry and operating conditions of a tube bank.
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