Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

8.46. A typical household of four people consume approxi-

mately 80 gallons of water per day. Express the annual

consumption rate of a city with a population of

100,000 people. Express your answer in gallons per

year, ft

3

per year, liters per year, and m

3

per year.

8.47. The American Society of Heating, Ventilating, and Air

Conditioning Engineers (ASHRAE) sets the standard

for outdoor air requirement for ventilation purposes.

For example, for a gymnasium, an outdoor air require-

ment of 20 cfm (cubic feet per minute) per person is

required. What is the total volume of the outdoor air

that must be introduced into a gym during a 12-hour

period if on average 30 people are using the gym every

minute? Express your answer in ft

3

, liters, and m

3

.

8.48. Lake Mead near the Hoover Dam, which is the largest

man-made lake in the United States, contains

228 Chapter 8 Time and Time-Related Parameters

28,537,000 acre-foot of water (an acre-foot is the

amount of water required to cover 1 acre to a depth of

1 foot). Express this water volume in gallons and m

3

.

8.49. Within the next 10 to 15 years, wind turbines with

rotor diameters of 180 m are anticipated to be devel-

oped and installed in Europe. If the blades of such tur-

bines turn at a rate of 5 revolutions per minute, what

is the speed of a point located at a tip of a blade?

Express your answer in ft /s, m/s, km/h, and mph.

8.50. The design fluid (typically water and antifreeze) flow

rate through a solar hot-water heater system is 0.02

gpm/ft

2

. If a system runs continuously for 3 hours and
makes use of two solar panels (each 4 ft8 ft), what
is the total volume of the fluid that goes through the
collector during this period? Express your answer in
gallons, ft
3
, liters, and m
3
.

“If you study to remember, you will forget, but, if you study to understand, you will remember.”

—Unknown

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