You\'re studying this assignmeni HWW07 ch Closed System Energy analysis 2 Questi

Question

You're studying this assignmeni HWW07 ch Closed System Energy analysis 2 Question (of 4) 4. 10.00 points Ch Ex. 70- Chapter 4 Problem T5 1 out of 3 attempts Round your answer to one decimal place. Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. Assistance Initially, air is at 521 kPa and 2 c. The paddle wheel is now turned by an extermal electric motor until kukg.twork has been transferred to air. During this process, View Hint heat is transferred to maintain a constant air temperature while a the as velume to triple. Calculate the required amount of heat transfer, in kuks. Question Help Air 521 kPa mograwhill Y... X water at 50 Fia... X M ezto.mheducation.com/hm.tpx

Explanation / Answer

p1 = 521 kPa

T1 = 27 C

Pv = RT

v = RT/P

= 287 *300/521000

= 0.165 m3/kg

W = -47 KJ/kg

V' = 3V V = Volume

by 1st law of thermodynamics

Q = U +W

Q = W as temp. is same change in internal energy will be 0, so U = 0

Q = Wboundary + Wexternal

= (P- Patm)*(3V- V) - 47000

= (521000-101325) *2 *0.165 - 47000

= 91.49 KJ/kg

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