Question

An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the com pression process, air is at 95 kPa and 27℃ Accounting for the variation of specific heats with temperature, determine (a) the temperature after the heat-addition process, (b) the thermal efficiency, and (c) the mean effective pressure

Answer 1

Ans Given fhat An AA,Straasd Diesel Cycle ras a Cernanessim Yako At tna begining, an a 95kra awd 272 4 Out ラ、V Exbiess tempesali ad Speckfic voluae elation 0 V2. Heye TTempe ratare at Stota T2 Tempera v, -specific Volume atStato. ½ . SPecific Volume atstato 2 kPecific heat alio

V2/ 30ok x 16 989.4k T989.yk es tetenperali, pestuse aud Speci-fic Volume relatino far tre censhnt pressure hect adatio process 2 Hereノ T3 . Tempenture at Stat. 3 v2や specified Volume ct th 2 Vg: Specific Volame at state 3 P3: pressure at Stalo 2

For pocess 2-3, So V3 2- 909.4 1818.8k Hexce, tne temperature at the end f me haat ition process is%--siBK b) The Theimal eftciency addition Process 2-3 For Constant Pessure heat a expyess ho eat odelition (in) as Ye Op Specific heat at Constant pessire Substibit 12- 909.k

'-i.to5KJKg.KK909 .4太 913.3g aud specific volume velation as Vy t, Tempenliue at Stns N Specific volune at Stah 4 Scuostitut 8188 k V2 /6

For Constant volve heat vejeclion PICESS1, xess iht HeYe, Specific heat at Constant Volume ul = Trtenal ener7y at state l U4 Internal eneray d stal i Substitate 11 = 300K out353 Expes s the 'therma, ethiciena ƠHs arcletuwas out

Subs lituto 1 in 13.93i 353に丁/kg th : 1-3862 2 0. 6138 : 0 619 díesel Cycls i 647 The mear) ve Pye SSuYe Exless the net wc oatput fol ths ycl as Substituth Out Wnet i Out (913.9 3S3) kJ/Kg 560 9 r3

trpess the taal gas election -foyan at state소 a.s RT Pt Here Pre sare, State 1 al ? - Jas Costart uostituta as kpa 0306 3 The naximu volume the given clasel cycle Emess the ranean 톼fective Tres suxe-fa tha giver) diesel aycls (MEp) as Wnet iout NT wnet but

Heye, Substitute net ocut 560 93x9 大丁 the mean 다tective pressure fo the aiven diesel Cycle 66o 4 kpa, ver)