Problemas de maquinas termicas

UnaPequeñaNeveACop=Qf/w=Qf/Qc-Qf=Tf/Tc-Tf=263/301-268=6,92(maximaIdeal)!Tf=-10ºc=263kTc=28ºc=301Qf→Pa

bs=700kj/hx1000j/1kjx1h/3600s=194,44wAε=Qf/w=(qf/t)/(w/t)=Pabs/ε=28,1wBQc/t=w/t+Qf/t→Pced=Pw+Pabs→Pced=

194,44w+28,1w=222,54wCεreal=0,6.εcarnot=4,15!εreal=Pabs/pw→Pw=Pabs/εreal=46,85wElMotorDeGasoAη=25%Pc=990

0Kcal/kgRo=0,68g/cm³Consume=20l/hx1000m³/1lx0.68g/1cm³x4400Kcal/1Kgx1000cal/1Kcalx4,18j/1calx1h/3600s=15633

2w=PabsBη=w/Q=(w/t)/(Q/t)=Pu/Pabs→Pu=ηxPabs=0,28x156332=43772,96wCM=P/ω=43772.96/366,52=119,43N.m!ω

=3500rpmx2π/60s=366,52UnMotorDeCarnotTc=400kTf=300kAη=w/Qc=Qc-Qf/Qc=1-Qf/Qc=1-Tf/Tcη=1-Tf/Tc=1-300/

400=0,25!1-Qf/Qc=0,25→1-0,25=Qf/Qc!Qf=Qc(1-0,25)=900calBCop=Qf/w=Qf/Qc-Qf=Tf/Tc-Tf=300/400-300=3!3=Qf/

Qf-Qc=1200/1200-Qc→Qc=1200/3+1200=1600calCCop=0,7x3=2,1=Qf/w=Qc-w/wElMotorDieAConsume=15Kg/hPc=10

500Kcal/Kgηreal=29,5%=0,295ηcarnot=0,295/0,9=0,328(rendimientoMaximo)ATf=303ºkη=1-Tf/Tc→Tf/Tc=1-0,328!Tc/Tf=

1/1-0,328→Tc=Tf(1/1-0,328)450,89BC=Pabs=15Kg/hx10500Kcal/Kgx1000cal/1Kcalx4,18j/1calx1h/3600s=182875Wu!ηreal=

wu/Qc=(Wu/t)/(Qc/t)=Pu/Pabs=Pu182875w!Pu=0,295x182875w=53948,18wCt=1s!Qf=Qc-w=128926,87j/s