Egg Industry - May 2018 - 5
EggIndustry ❙ 5
A heat exchanger allows for the fresh cold air from outside the layer house to be preheated by the
warm exhaust air. | Courtesy of Vencomatic
issues this past winter, despite some very cold periods.
The only negative observation they report since last
fall has been an increase in dust inside the house on some
warm days due to manure becoming even more dry than
normal. Mrs. Van Vuuren mentioned, "The ammonia levels are much lower due to the lower humidity. Litter quality is much better with the Clima+ unit. The environment
is much better for both the birds and workers."
Vencomatic has installed several heat exchanger
units in the U.S. and claims 80 percent thermal efficiency. Producers are encouraged by the company to
combine the heat exchanger with a manure belt aeration
system. Preheated by normally wasted heat from exhaust air, warm fresh air is piped to manure belts under
an aviary system to dry manure while still in the house
and provide fresh warm air to the birds. Air brought in
from outside in the wintertime will have lower relative
humidity than house air, so using heated outside air will
dry the manure more quickly than house air will.
As environmental contamination is becoming more
closely scrutinized the heat exchanger incorporates
filter systems to capture dust (particulate matter) from
exhausted air reaching 80 percent efficiency.
Heat exchangers do not entirely eliminate the need
for supplemental heat. Vencomatic employs a propane
fired preheating unit to heat incoming air when temperatures fall below 15 F.
May 2018 ❙ www.WATTAgNet.com
Maarten Vlug, engineer, Jansen Poultry Equipment,
notes that in Jansen's heat exchanger design, "With
those low temperatures (under 5 F), we use a water or
gas heater after the heat exchanger to get the temperature close to 64 F before the air enters the house. As
for our heat exchanger, I would recommend installation
inside the house with temperatures lower than -4 F or
an external enclosure that is well insulated. At very low
outside temperatures, the water supply will be shut off to
prevent damage to the water or brush cleaning system."
Dealing with dust
One concern with heat exchanger technology has been
the ongoing cleaning and maintenance required to keep
systems from plugging or clogging up with dust. "Crossflow heat exchangers always have pulse jet air filters
which are automatically cleaned by pulses of air. But the
downside is that use of filters will create a high counter
pressure, thus requiring stronger fans," noted Vlug.
Jansen has an additional cleaning option that includes
a patented automated brush system in combination with
water flushing. Vencomatic has designed an automated
flushing system which uses water to clean dust between
the panels once a week. In warm weather, when supplemental heat is not needed, the heat exchanger can be bypassed to eliminate the need for cleaning the system.
Victor van Wagenberg, product manager,