Exhaust steam from a turbine enters a condenser with a specific enthalpy of 2164 kJ/kg and a velocity of 75 m/s. During the cooling process, the heat loss to the cooling water per kg of working fluid is 1680 kJ/kg. The condensate exits the system with a velocity of 12 m/s. Sketch a systems diagram for the condenser and determine the specific enthalpy of the working fluid at exit from the condenser.
Propane gas is to be burned in a furnace at the rate of 1000 LPH at STP, using 15%
excess air. For achieving energy efficient operation, preheated air at 100 C is to be used.
Assume that the ambient air completely dry and at 1 atm absolute pressure is available at
10oC. Calculate the energy required for heating the air (in kJ/h) from 10C to 100oC.
A hot aquifer of height h km , cross-sectional area A km2 and porosity p’ is located at a depth of z km. Derive expressions for the energy and power available at a given time t . Also, determine the time constant for energy extraction and explain its significance.