AW 200 User Manual

SECTION
3
COOLING
REQUIREMENTS
The
most
important
part
or
requirement
is
water for
cooling
the
dynamometer.
Through
the
conversion
of mechanical
energy
into
heat
energy
by
the
dynamometer
tremendous
amounts
of
heat
is created.
The
unit
of
quantity
of
this
thermal
energy
is
ealled
British
Thermal
Units
or B,T.U.s.
One
B'T.U.
is
the
amount
of heat (thermal
energy
required
to raise
the
temperature
of 1
pound
of
water),
10F
in 1
minutb
of
time.
778
isthe
number
of
foot
pounds
of meehanical
energy
equivalent
to
1 B.T.U.
and is
called
the
mechanical
energy.
It
takes
33,000
ft lbs
of
work
in
1 minute
to
produce
t horsepower.,
33,000
divided
by
778:42.6
B.T.U,
per
horsepower.
Let's
say
we.
are
testing
a 100
H.p.
tractor
on
a dynamometer.
100
H'P.
X
42'6:
4260
B.T.U.
per
minute
of eooling.
If
we
are
to load
test t
hour
we have
a
totalquantityofheat
of 4260
B,TU.
@minuteX60:255,600B.T.u.perhour.
Thisisequaito
a
furnace
roughly
heating
2
Yzhouses
with
the
thennostat
eompletely
u.? on
high for
one
hour.
trt
is
this
heat
whish
must
be
removed
from
the
dynamometer
in
order
io keep
it coal.
Without
proper
cooling
your
test
periods
would
be
short
and
the
dynamometer
life
will have
short
intervals
befwoen
major
overhauls.
Installations
with
an insufficient
supply
of water
must
follow
Inspection/Servicing
Brake
Drum
Unit
in
Section
6
very
closely
to
prevenidamage
to
the
equipment
or
injury
to
personnel.
The
following
charl
shows
several
types
of cooling
systems
that
have
been
used
down
throush
the
years.

AW 200 Specifications

General

Brand	AW
Model	200
Category	Measuring Instruments
Language	English