Please help. Step by step explanation on how to solve the ones I got wrong pleas
ID: 1630199 • Letter: P
Question
Please help. Step by step explanation on how to solve the ones I got wrong please.
Complete Analysis of a Refrigerator Goal Solve for the performance coefficient of a refrigerator using a five- step process the includes: 1. Making a state table. 2. Making a process table. 3. Calculating the totals for Work, Heat, and Internal-Energy-Change. 4. Identifying the heat input (cold reservoir) and output (hot reservoir) 5. Calculating the performance coefficient of the refrigerator. isothermal Problem Shown in the figure to the right is a cyclic process undergone by a refrigerator. Your refrigerator shall use 4.0 moles of helium gas (monatomic). During the process a->b, the volume increases by a factor of 4.0 T. =300 K Pa - 100,000 Pa Refrigerator CycleExplanation / Answer
b-c is an isothermal process
Work done = nRTln(Vc/Vb)
n= 4 ; R = 8.314;Tb=Tc (isothermal)
for process a-b;
Va/Ta = Vb/Tb
Ta/Tb = 4
Tb = (Ta/4) = 75K
Work done = nRTln(Vc/Vb)
i.e = 4x8.314x75(-1.38)
= -3457.69 Joule
Q = W [for isothermal]
Pc/T1c = Pa/Ta
U= Cv x Nx dT
= 3.12x4x(225)
Q =CvxV/R[Pf-Pi]