A cylindrical tank measuring 0.75 m in diameter and 1.2 m high contains a transformer immersed in an oil bath that produces a uniform surface temperature condition. All heat loss may be assumed due to natural convection to surrounding air at 295 K from the top and side walls. The heat dissipation rate from the transformer is constant at 1.5kW. Required:
Write down the total heat transfer rate equation as a function of surface temperature and relevant characteristic dimensionless numbers.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false