Question

Tank A contains 20 kg of steam at 1Mpa, 600 C. Tanks B is initially empty and fitted with a piston that requires 0.3Mpa to lift. The valve is cracked open and remains open. the process ends with the tanks in equillibrium at 150 C. Find Q, Wrev.

300K 300kpl POMAT TEMP OF SURROUNDINGS TANK A CONTAINS 20 kg A STEAM AT 1 MPa, 600°C . TANK B is INITIALLY EMPTY AND FITTED WITH A Piston THAT Requires .3MPA TO LIFT. The VALVE 1 Fracked OPEN AND Rengas open. The process ends w/TH The TANKS IN EQUILIBRIUM AT 150°C. FIND Q, Wher

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Answer 1

Criveni Tank A contains 20kg of steam at pressure, p= 1 mpo, Temperature, T = 600°c tank Bid initicly impty and fitted with A pistan that requires 300 kPa to lift. The rolve is now open the proces ends with the final equalibrium at T = 1500 Sarrondings Temp. To = 300k B Score -piston A because pressure ing tank B is 300 kPa which is constant hence final equitibnom prewure is ciso Pg = 300kPa from stoom table at p=300 kPa, T = 150c P=300 kpa, To = 133' a superheated state. -US= 0.63 402 m 1kg, u = 257 Kolky at p= impo, T = 600°c h = 2761.2 kilig . Va 0.40111 milky, h = 3698. Tolig hence beat trins for = m (hah) 20(276):2-36980 9 = -18738m heat transfer to the surroundings volume of tank A, VA = Sxm V = 0.40111x20 - 8 m3 VA final moss an tank A, (mfa 0 · 63402 8 (y) f® 12.683 kg now mass transfer to tank B- MB = m+ (MA) mo=7.347 kg final volume of tank B, (VB)f= - Us xmB = 0.63 402x7.397 Bf = 4.6582 m3 Hence work done, w = PB (VB) f - (VB) :) 1397.46 ks Warer 300x (4.6582-0)