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Lancaster Fanning,
Saturday, December 18,
1982-A3l
Cut water
heating 9
milk
cooling
costs
UNIVERSITY PARK
Milk can be used to
save energy and money
for a dairy farmer.
Agricultural engineers
have studied ways for
farmers to use heat
exchangers to draw
heat from milk and heat
water in milkhouses and
parlors.
“the idea is not new,"
says James W. Garthe,
Penn State Extension
agricultural engineer.
The concept of a heat
exchanger system was
researched in the mid
’6os, when electricity
was a relatively cheap
commodity.
“But interest has
changed or developed
with increased cost of
energy,” he says, “and
heat exchangers have
only been in com
mercial competition the
last few years.”
Garthe says the heat
exchanger is part of the
refrigeration system
used to cool milk.
Rather than using a fan
to blow excess heat
outside, these devices
use that heat to warm
water. Many types and
models are available,
with some more ef
ficient than others.
Most dairy
operations, says Gar
the, use between two to
three gallons of hot
water per cow per day.
Farmers can cut water
heating cost in half by
installing a heat ex
changer.
Approximately one
kilowatt hour heats four
gallons of tap water to
140 F. A 100-cow herd
uses about 200 gallons a
day and pays the
electric company over
$2.50 a day, or over $9OO
a year. Half of that
amount or about $450 is
a welcome savings,
thanks to these heat
exchangers.
“The payback on
these units is about
three to four years, if
properly sized to your
herd’s milk output and
hot water needs,"
Garthesays.
Depending on the set
up, some systems can
heat water in a range of
temperatures tepid
enough for washing
udders or hot enough for
sanitizing.
To aid the dairy
farmer, Penn State has
developed a computer
program to select the
right type of exchanger
for heating water. A
brief worksheet will be
sent to interested far
mers. This service is
free to all Pennsylvania
dairy farmers.
For more in
formation, write or call:
Steve Spencer, Dairy
Science Extension, 213
Borland Lab.,
University Park, PA
16802, telephone 814/865-
5491.