M-Lanostw Firming Saturday, October 7,1989
David Kradel Herbert
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o
Poultry
Pointers
Herbert Siegel Donald Singletary Owen Keene
COMPARING INSULATION?
DON’T GET HOT!
Jon M. Carson
Ass’t. Professor, Ag Engineering
One of the important tools used
in poultry housing is insulation.
Radiant foil insulation have been
advertised and promoted recently
for use in poultry houses. Radiant
barriers are but one of several
kinds of insulation. Each type of
insulation has advantages and dis
advantages. The optimum type and
level of insulation used for poultry
houses will depend on the desired
temperature, comfort, and cost.
Fiberglass, cellulose, foam, and
other conventional insulations are
rated with a “R” value. The greater
the R, the better the insulation
reduces conductive and convective
heat transfer. Conduction is
reduced by trapping air in the fib
ers and particles of the insulation
and stopping the air movement
Air that is motionless is a good
insulator because it does not con
duct heat well. Moving air results
in convective heat transfer, which
can be very effective in transfer
ring heat Wind chill is an example
of increased convective heat trans
fer due to air movement A winter
coat reduces convective and con
ductive heat loss in the same way
conventional insulation reduces
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heat losses in a building.
Reflective foil insulations work
by reducing radiant heat exchange.
Radiant heat is transferred without
using air or a solid to conduct the
energy. You feel radiant heat
exchange when sitting in front of a
open fire. The heat transfer to you
can be stopped by shading yourself
with a solid object. Foil insulations
are used to block the radiant heat
and can not be rated with a R value
because they do not work in the
same manner as conductive
insulations.
Reflective foil insulations are
most effective when large temper
ature differences occur or where
convective and conductive heat
transfer is minimal. They can often
be found inside engine compart
ments where manifold tempera
tures can reach 1,200 F and outer
space applications where air is not
present for convective heat
transfer.
In traditional poultry housing,
reflective foils are best used when
added to conventional insulations.
The addition helps to reduce the
overall heat loss or gain. For exam
ple, foils have been placed over
existing insulation in attics to
reduce the heat gain in summer.
These applications have been used
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with success in Southern climates
where extreme temperatures can
occur.
The use of adequate amounts of
conventional insulations will keep
the walls and ceilings of a poultry
house cooler in summer and war
mer in winter than reflective foil
insulations alone. The addition of a
radiant barrier can help the overall
CA
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17
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WAIVER OF FINANCE APR. 1,1990 on all other equipment
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SPRINGS
EQUIPMENT, INC.
Spring*, PA
•14-662-2222
UNCOLN SUPPLY & SYSTEMA FEED SERVICE BINKLEY 4 HURST
EQUIPMENT CO. Summ, n.j. STOUFFER BROS. BROS.
Somarut, PA 201 -*75-5449 INC. LHltz, PA
■l4-443-1691 Chambmburg, PA 717-628-4705
McCoola, MD 717-863-6424
301-766-6600
D.W. OGG
EQUIPMENT CO.
Main Location
Frodariek, MD
301-473-4250
301-293-2033
Taylorsville, Md.
(Bob’s Welding)
301-829-2042
UMBERGER'S
OF FONTANA
Labanen, PA
717-887-8161
performance of the insulation sys
tem. However, conclusive results
are not available for their cost
effective use in Pennsylvania.
Fiberglass and other conven
tional insulations have been wide
ly used because their cost per R
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GUTSHALL’S INC.
Loysvlllo, PA
717-780-4343
PEOPLE’S
SALES & SERVICE
Oakland Mills, PA
717-483-2738
A.L HERR & BRO.
Quarryvilla, PA
717-786-3821
ARNETT’S GARAGE ECKROTH BROS. ELDER SALES
“ D FARM EQUIPMENT & SERVICE, INC.
301-733-0818 Ntw Ringgold, PA Slonaboro, PA
717-043-2131 412-376-3740
values has been reasonable.
Recommendations for insulation
levels in Pennsylvania are R-20 in
the walls and R-33 in the ceiling.
These values are based on typical
costs of conventional insulations
and operating temperatures.
0%
8.5%
9 5%
10.5%
NICHOLS FARM MILLER EQUIPMENT
EQUIPMENT CO.
Bloenwburg, PA Bachtolavtll*, PA
717-7*4-7731 21S-M5-2911
PETERMAN FARM
LEBANON VALLEY EQU^ N T> INC .
IMPLERILh!IXdpS:’INC
-717-S6S-7511
MILLER-LAKE
Ballavllla, PA
717-935-2338
HINES EQUIPMENT
Cratton, PA
814-888-4183
Ballwood
814-742-8171