) Steam enters the condenser of a steam power plant at 75 kPa and a quality of 75 percent with a mass flow rate of 180000 kg/hr. It is to be cooled be water from a nearby river by circulating the water through the tubes within the condenser. To prevent thermal pollution, the river water not allowed to experience a temperature rise above 8 oC. If the steam is to leave the condenser as saturated mixture at 101.325 kPa with a quality of 10 percent, determine the mass flow rate of the cooling water required in kg/s. (cp of water, not steam, is 4.18 kJ/(kg*K))

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet