Page 228 - Handbook of Energy Engineering Calculations

reduce atmospheric pollution. Reduction in fuel sulfur content will not
require any change in engine operating procedures. If anything, the lower
sulfur content will reduce engine maintenance requirements and costs.
The usual distillate fuel specification recommends a sulfur content of not
more than 1.5 percent by weight, with 2 percent by weight considered

satisfactory. Refineries are currently producing diesel fuel that meets federal
low-sulfur requirements. While there is a slight additional cost for such fuel
at the time of this writing, when the regulations went into effect, predictions

are that the price of low-sulfur fuel will decline as more is manufactured.
Automobiles produce 50 percent of the air pollution throughout the
developed world. The Ozone Transport Commission, set up by Congress as
part of the 1990 Clear Air Act, is enforcing emission standards for new
automobiles and trucks. To date, the cost of meeting such standards has been

lower than anticipated. By the year 2003, all new automobiles will be
pollution-free—if they comply with the requirements of the act. Stationary
diesel plants using low-sulfur fuel will emit extremely little pollution.

ENERGY REQUIREMENTS FOR I-C ENGINE COOLING-
WATER AND LUBE-OIL PUMPS

What is the required power input to a 200-gal/min (12.6-L/s) jacket-water
pump if the total head on the pump is 75 ft (22.9 m) of water and the pump
has an efficiency of 70 percent when it handles freshwater and saltwater?
What capacity lube-oil pump is needed for a four-cycle 500-hp (373-kW)

turbocharged diesel engine having oil-cooled pistons? What is the required
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power input to this pump if the discharge pressure is 80 lb/in (551.5 kPa)
and the efficiency of the pump is 68 percent?

Calculation Procedure:

1. Determine the power input to the jacket-water pump
The power input to jacket-water and raw-water pumps serving internal-
combustion engines is often computed from the relation hp = Gh/Ce, where
hp = hp input; G = water discharged by pump, gal/min; h = total head on

pump, ft of water; C = constant = 3960 for freshwater having a density of