Question

Given the following cases for water, designate the state as specifically as possible (e.g., 2-phase and specify further if a saturated vapor or saturated liquid, superheated vapor, compressed liquid) of the water and find the other properties (pressure, temperature, specific volume, specific internal energy, quality) not given. Show your final answers in a table like the one listed below (a) P-1.5 bar, u-3000 kJ/kg (b) T 120 C, v 0.60 m/kg (c) P-3 bar, u 2543.6 kJ/kg (d) T-| 90°C, x-20% (e) P- 25 bar, T-100 C (f) T-240°C, x: 0 u kJ/k 3000 Case P [bar 120 0.60 2543.6 20% 190 100 240 c) 25

Answer 1

Solution in Refere thermodynamic steam table. @ P=1.5 bar, u = 3000 kilka at P=1-5 bar, Ug = 2sig. 7 kJ/xg as u 749 : Superheated Vapout (X=NA) from superheated table, at U = 5000 JP JING T=420-18°C V=2.1296 mol og O T=120°C, V = 0.60 mº/84 at T-120°C, Of = 0.0010 6032 Pat = 1.985 bak vg = 0.8919 J peg as Of <V < Vy : 2- phase & Satweated mistwee. VF VF + 2 Cug- uf) 0.60 = 0.0010603 + x (0.8319 - 0.0010603) 260-6716 or 67.16%. U= Uft x Upg = Uf + 2(Ug-44) .: u = 503.50 + 0.6716(2529.3- 503-50) 4= 18689-03 R Jl Jea © P= 3 bax, u = 2543-6 te gleda at 3 bar, Ug = 2543.6 URTIRE as u = Ug ; Saturated Vapout (x = 1.0) :..x= 100*1. T= Tsat = 133.6°C at P = 3 bove

V = vg = 0.6058 m3/984 at 3 bat T=190°c, x = 20% as se = 20% or H = 0.20 A 2-phase and sateveated misture at T=190°C, Psat = 12-54 bar V = VF+ recogUf) V = 0.0011414 + 0.20% (0.1565-0.0011414) V=0.03221 molta = 4 x ( - - ) 4= 806.19 + 0-20%(2590-0 - 806.19) 4 = 1162.95 Ilson P=25 bar, T=100°C at P= 25 bar, Tsat = 224%. as T< Tsat i compressed liquid cx = NA) by compressed liquid approximation, 9 @ V = V Tsat - 100°C Tsat - 100 = 0.001043 4 = of @ Tsut = 100°C = 418.94 kulipa T=240°C, X=0 as r=0 . saturated liquid at T = 240°C, Psat = 33.44 bare u=4 = 1033.2 play V = Vp = 0.0012291 m ling

case PC base) 1.5 1.985 Tec | B (m3/Rg) | CARTIE). state 420.18 | 2.1296 3000 NA , Superheated vapore 120 0.60 1864.03 , 67.16 , 2-Phase, saturated - mistevee 133.6 0.6058 2543.6 10 Saturated vapour 12- phase, saturated 190 0.03221 1162.95 20 misture Too 0.0010435| 418-94 compressed liquid O saturated 240 0.00122911 1033.2 liquid [ D ] 12.54 25 33.44