Egg Industry August 2019 - 7

EggIndustry ❙ 7

Side view of cage-free laying house ventilation system Room A and B
Ceiling air inlet

Slot inlet

Side wall air inlet

Hemisphere mixing fan

Ventilation fan

Attic

3.7 m

fan bank
Room B

Exhaust

Hallway

Room A

30.5 m

1.8 m

The east rooms of the second floor (Room A) and first floor (Room B) are ventilated differently. The west side
of the house mirrors the east.
inlets mounted over two of the six aisles of birds. In
cooler weather, 198 ceiling inlets per upper unit of the
house are open. Slot inlets for the interior wall of the
plenum are used in hot weather or when maximum
ventilation is desired.

Lower floor
Room B has no ceiling inlets. Instead, fresh air enters the
room from 75 inlets on the east outside wall with hoods
and light traps. There are an additional 147 inlets on the
west interior wall to be used during cooler temperatures.
Like Room A, Room B also has continuous slot inlets for
warmer weather.
The west side of the house mirrors rooms A and B.

An initial analysis of the system
Brett Ramirez, Ph.D., assistant professor in the
Department of Agricultural and Biosystems
Engineering at Iowa State University (ISU) took an
in-depth look at the ventilation system on the east side
of the building located in Iowa.
Together with his team, Ramirez was able to reduce
August 2019 ❙ www.WATTAgNet.com

heating fuel usage through the identification of improper
ventilation control parameters.
"Each facility requires individual tuning of settings
and, with the enormous amount of data available in modern
ventilation controllers, troubleshooting and optimization are
much simpler to perform and achieve," he said.
Through the team's evaluation, they also found that
"house-level sensible heat production was determined
to be greater than previous values found from cage-free
barns." Ramirez explained that this finding will affect
future cage-free housing supplemental heat and ventilation design.
The classical understanding of how animals lose heat
suggests that, as temperature increases, sensible heat
production decreases; however, air temperature, relative
humidity, and airspeed all affect the thermal comfort
(heat loss) of the birds, he said.
"So, in this facility, with high airspeeds, we measured
a little decrease in heat production as temperatures
increased, suggesting the ventilation system was adequate
in maintaining the birds in their thermoneutral zone,"
Ramirez said. ■


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Egg Industry August 2019

Table of Contents for the Digital Edition of Egg Industry August 2019

Egg Industry August 2019
Ventilating the world’s largest cage-free layer house
Employee ventilation training key to layer farm success
How to create an effective HACCP plan for shell egg plants
Egg Industry August 2019 - CT1
Egg Industry August 2019 - CT2
Egg Industry August 2019 - Egg Industry August 2019
Egg Industry August 2019 - Cover2
Egg Industry August 2019 - 3
Egg Industry August 2019 - Ventilating the world’s largest cage-free layer house
Egg Industry August 2019 - 5
Egg Industry August 2019 - 6
Egg Industry August 2019 - 7
Egg Industry August 2019 - Employee ventilation training key to layer farm success
Egg Industry August 2019 - 9
Egg Industry August 2019 - 10
Egg Industry August 2019 - 11
Egg Industry August 2019 - How to create an effective HACCP plan for shell egg plants
Egg Industry August 2019 - 13
Egg Industry August 2019 - 14
Egg Industry August 2019 - 15
Egg Industry August 2019 - 16
Egg Industry August 2019 - 17
Egg Industry August 2019 - 18
Egg Industry August 2019 - Cover3
Egg Industry August 2019 - Cover4
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