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 = 20.5 mm and st = 20.5 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 degree c, while the air upstream temperature and velocity are 15 degree 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?