2. A geothermal well produces steam at a rate of 40 kg/s. The steam is at a temperature of 250° C and a pressure of 200 kPa. The steam is expanded through the turbine to a temperature of 5° C where it is a saturated mixture with a quality of 85%. Determine the power delivered by the turbine, in MW.

2. 2 kg of water in a piston-cylinder assembly undergoes two consecutive reversible processes: a. Process 1-2: Isentropic compression from P1 = 0.1 MPa, T1=100°C to P2=D0.5 MPa b. Process 2-3: Isobaric process to a temperature T3 = 400 C Determine heat transfer (kJ), work (kJ), and change in specific entropy (kJ/kgK) for each process.

A piston-cylinder device initially contains CO2 at 200 kPa and 400°C and the total enclosed volume is 300 litres. Due to heat loss, the piston moves downwards to a position where it sits on a pair of stoppers and its final enclosed volume is 150 litres. Further heat loss leads to the pressure being reduced to 160kPa. Workout 1) the final temperature, 2) the total work done by CO2 and 3) the total heat transferred to CO2. Also make some comments on the result of heat and create a schematic p-v diagram of the process. The following assumptions are to be made: CO2 is a perfect gas and its molecular mass is 44kg/kmol. The ratio of specific heat capacities, γ (gamma) is 1.3 The volume occupied by the stoppers is to be ignored. There is no leakage in the system There is no friction between the cylinder and piston walls and the piston moved slowly at the same speed therefore, no acceleration. For the conversion from Celsius to Kelvin, use 273 Use 8314.5 J/kmol.K for the universal gas…

A 100L tank initially contains water at 100kPa and a quality of 1%. Heat is transferred to the water, raising the temperature and pressure. At a pressure of 3 MPa, a safety valve opens and saturated vapor at 3 MPa flows out. The process continues, maintaining 3 MPa inside until the quality in the tank is 90% and then stops. Determine the total mass of water that flowed out and the total heat transfer.