Calculate the rate of heat transfer for a steam flow rate of 220 Kg/Sec and latent heat of vaporization 25 KI/Kg.

Problem 2: A metal rod 0.4 m long & 0.04 m in diameter has one end at 373 K & another end at 273 K. Calculate the total amount of heat conducted in 1 minute. (Given K = 385 J/ms °C)

Steam enters a heat exchanger operating at steady state at 2 bar with a specific enthalpy of 1845 kJ/kg and exits at the same pressure as a saturated liquid. The steam mass flow rate is 1.6 kg/min. A separate stream of air with a mass flow rate of 68.5 kg/min enters at 37 °C and exits at 66.3 °C. The ideal gas model with c, = 1.005 kJ/kg.K can be assumed for air. Kinetic and potential energy effects are negligible.

A stream of ammonia is cooled from 100oC to 20oC at a rate of 180 kg/hr in the tube side of a double-pipe counter-flow heat exchanger. Water enters the heat exchanger at 10oC at a rate of 250 kg/hr. The outside diameter of the inner tube is 3 cm and the length of the pipe is 7m. Using the log-mean temperature difference, calculate the overall heat transfer coefficient (U) for the heat exchanger. Determine the heat transfer rate between the two fluids. Determine the outlet temperature of the water. Determine the heat transfer surface area. Determine the log-mean temperature difference. Determine the heat transfer coefficient for the heat exchanger.   Cp for ammonia is 5234J/kgK and cp for water is 4180J/kgK.

Thermodynamics 1