Diesel Power Plant (tangina mo talaga olasiman)

Question 1

Heat Supplied by Fuel, Q_A

Answer 1

mfHHV

Question 2

Air-Fuel Ratio (A/F)

Answer 2

ma/mf

Question 3

Piston Displacement,V_D

Answer 3

LANȠaȠc
Ƞa = number of action
Ƞc = number of cylinder

Question 4

Piston Speed, V_P

Answer 4

2LN
L = length of stroke

Question 5

Indicated Power, IP

Answer 5

mep_i * V_D

Question 6

Mean effective pressure, mep

Answer 6

(Ac*Sc)/Lc

if working cylinder and crancase are to be considered:
[(AcSc)/Lc]_wc - [(AcSc)/Lc]_cc

Ac = area of indicator card diagram
Sc = spring scale
Lc = length of indicated card diagram
wc = working cylinder
cc = crankcase

Question 7

Brake Power, BP

Answer 7

2πTN
where; T = Fr

mep_b * V_D

Question 8

Friction Power, FP

Answer 8

IP - BP

IP_6 = 6(IP_6-IP_5)

Question 9

Mechanical Efficiency, Ƞm

Answer 9

BP/IP
mep_b/mep_i

Question 10

Electrical or Generator Efficiency, Ƞg

Answer 10

GP/BP

Question 11

Thermal Efficiency, Ƞt

Answer 11

total work/heat input

Question 12

indicated thermal efficiency, Ƞti

Answer 12

IP/mfHHV

Question 13

Brake Thermal Efficiency, Ƞtb

Answer 13

BP/mfHHV

Question 14

Combined or Overall Thermal Efficiency, Ƞtc

Answer 14

GP/mfHHV

Question 15

Indicated Engine Efficiency, Ƞei

Answer 15

Ƞti/Ƞe

Question 16

Brake Engine Efficiency, Ƞeb

Answer 16

Ƞtb/Ƞe

Question 17

Combined or Overall Engine Efficiency, Ƞec

Answer 17

Ƞtc/Ƞe

Question 18

Volumetric Efficiency, Ƞv

Answer 18

V_a/V_D

V_a is derived from PV=mRT

Question 19

Indicated Specific Fuel Consumption, mi

Answer 19

mf(3600)/IP, kg/kW-hr

Question 20

Brake Specific Fuel Consumption, mb

Answer 20

mf(3600)/BP, kg/kW-hr

Question 21

Indicated Heat Rate, HRi

Answer 21

mfHHV(3600)/IP

Question 22

Brake Heat Rate, HRb

Answer 22

mfHHV(3600)/BP

Question 23

Combined or Overall Heat Rate, HRc

Answer 23

mfHHV(3600)/GP

Question 24

Generator Speed, N

Answer 24

N = 120f/P
f = 60 hertz if not given
P = no. of poles