Chapter 10: Power Plants

Richard K. Pefley

OVERVIEW

Reciprocating Engine Closed Cycle Models:

Thermal efficiency basic definition

Other terms that are frequently encountered:

Gas Turbines - Brayton Cycle:

Other terms that are frequently encountered:

Rankine Vapor Power Cycle:

Other terms that are frequently encountered:

Heat rate:

Boiler hp = h _fg 34.5 lbm/hr at 212 F = 33,475 Btu/hr

Terminology for Power Plants Review

Symbols:

A		piston area
bhp		brake horsepower
bmep		brake mean effective pressure
bsfc		brake specific fuel consumption
fhp		friction horsepower
HR		heat rate
ihp		indicated horsepower
imep		indicated mean effective pressure
isfc		indicated specific fuel consumption
k		specific heat ratio
?		stroke length
		mass flow rate
N		revolutions per minute
n		number of cylinders
p		pressure
r		ratio
T,t		temperature
v		specific volume
W		work
?		efficiency

Subscripts:

a		actual, added
b		brake
c		clearance, compressor, compression
cc		cylinder-cycle
d		displacement
i		indicated
n		net
t		thermal
tu		turbine
reg		regeneration
v		volume
f		fuel

NEW VEHICLE EMISSIONS STANDARDS SUMMARY
(Taken from California Air Resources Board Fact Sheet 72-6 5000 6-72)
LIGHT-DUTY VEHICLES UNDER 6,000 lbs
Year	Standard	Cold Start Test	Hydrocarbons	Carbon Monoxide	Oxides of Nitrogen
Prior to Controls

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