Steam Engine

Question 1

Volume Displacement (piston rod neglected), V_D

Answer 1

LANȠcȠa

Question 2

Volume Displacement (piston rod considered), V_D

Answer 2

2(LAN)_cylinder-(LAN)_piston rod

A_cylinder = π/4 * D^2
A_piston rod = π/4 * (D^2-d^2)

D = diameter of cylinder
d = diameter of piston rod

Question 3

Mean Effective Pressure (Average area is given), mep

Answer 3

(A_D/L_D)*k
k = spring constant

Question 4

Mean Effective Pressure (two areas are give for both sides of piston), mep

Answer 4

{[(A_1+A_2)/2]/L_D}*k
k = spring constant

Question 5

Indicated Power, IP

Answer 5

V_D * mep_i

Question 6

Brake Power, BP

Answer 6

V_D * mep_i
2πTN
where T = Fr

Question 7

Friction Power, FP

Answer 7

FP = IP-BP

Question 8

Mechanical Efficiency, Ƞm

Answer 8

BP/IP

Question 9

Indicated thermal Efficiency, Ƞti

Answer 9

IP/ms(h1-hf2)

Question 10

Brake Thermal Efficiency, Ƞtb

Answer 10

BP/ms(h1-hf2)

Question 11

Indicated Engine Efficiency, Ƞei

Answer 11

IP/ms(h1-h2)

Question 12

Brake Engine Efficiency, Ƞeb

Answer 12

BP/ms(h1-h2)

Question 13

Cooling Water Requirement in Condenser, mw

Answer 13

QR=QW
ms(h2-hf2)=mCp∆T

Question 14

Generator Efficiency, Ƞgen

Answer 14

GP/BP