Question

5. (25 Pts) Water in a piston-cylinder device exists as a saturated liquid at a pressure of 2.0 MPa (2000 kPa). Heat is then added to complete this process such that the final temperature of the water is 500 °C. Determine the following: a. What phase is the water in at State 2? b. If V1 = 2 m3, what is the mass of water [kg] in the piston-cylinder device? c. Show the process on a T-v diagram. Clearly label the location of both States 1 and 2, the direction of the process, the values of all temperatures and pressures, and values of v1 and V2.

Answer 1

Dj If Vps 2743 walls saturated e Finel teroppaatuse Ta: sda•c Ophase of water in State a steam tables Saturation terapezature Ti= 212.4°C Pressure P - 2MPG 2000 kPa - From the data of Stearn. Tables piston Cylinder device exists in liquid Stade in the given - From of water - Fron given data Ta- 500°C we can conclude that the Gjatesi in saturated liquid State after the addition of heat goes to Sopes heated vapour vapour State at phase a will be heated State" " Super - so water mass of water in piston 3 3 Cylinder devire at Vp = 1-1767 * to main From Stear Stearn saturated liQuid We have Specific valurie specific volurie volume wil mass (m mass 2 ary milk sk 1.1767 *103 -3 Kg 116.196 *10 0.001699 Kg CS Scanned with CamScanner

on. T-v diograr 9 Process From given that is constant We can conclude pressure ress constant pro AT Terpe. Pressure V2 - Ta T Va= V Ta Va= 2* [500 +273] v Iz [212.4 +273] V2= 3.1873 5W TE 19.4 3.18 CSScanned with Cams darnera ry