Q1.
(c) Starting with an energy balance on a spherical shell volume element, derive the 1-D transient heat conduction equation for a sphere with constant thermal conductivity and without any heat generation.
(d) What is the difference between fin effectiveness and the fin efficiency ? Explain how the fins enhance the heat transfer from a surface ? Also explain how the addition of fins may actually decrease heat transfer from a surface.
(e)
What are the methods used for increasing the efficiency of rankine cycle with the help of T-S diagram?
Atmospheric air at a flow rate of 3 kg/sec (on dry basis) enters a cooling and dehumidifying coil with an enthalpy of 85 kJ/kg of dry air having a humidity ratio of 90 gm/kg of dry air. The air leaves the coil with the enthalpy of 43 kJ/kg of dry air and a humidity ratio of 8 gm/kg of dry air. If the condensate water leaves the coil with an enthalpy of 67 kJ/kg, determine the required cooling capacity of the coil in kW.
