28 REFRiGERATion & SToRAGE
Innovations in freezing mean
reduced frost-related downtime
hen a freezer runs, snow builds double or triple run times. This option is applied
Traditionally, the
W
up on the coldest part of the on all freezing equipment product lines from
downtime needed to freezer-the evaporator. For a JBT FoodTech.
defrost freezers has been
given freezer capacity, a greater Another technique that can be used instead
an obstacle preventing
total surface area on the evaporator creates of ADF is mid-shift defrost. During the night
food and beverage
a more efficient freezer that can run longer shift when the line is not running, the freezer is
processors from getting
maximum efficiency out of
without defrosting. stopped and the ammonia refrigeration system
their production lines. But
By significantly increasing the face area on is reversed to send hot gas instead of refrigerant
recent advances can keep
the evaporator coil and on the cooling surface to the evaporator. This quickly defrosts the
production lines running
of the evaporator’s fins, the latest generation of evaporator while still maintaining the rest of
longer, resulting in greater JBT FoodTech freezers gives frost more places to the freezer below freezing point. Then water is
throughput – and greater
build up. This keeps the frost from concentrating flushed over the evaporator to rinse it and the
profitability.
in one location, thus extending the time the freezer is restarted.
freezer can run without defrosting. Producers who need even greater run times
Les temps d’arrêt
The air leaving the evaporator is very dry, than provided by ADF or mid-shift defrost have
nécessaires pour dégivrer
since moisture is left on the evaporator fins. In another option – a freezer with sequential
les congélateurs ont
the past, JBT FoodTech freezers featured fans defrosters. A typical freezer uses one chamber
toujours constitué un that were positioned in front of the evaporator, to which all the evaporator pieces connect.
obstacle empêchant les facing the air flow direction. As a result, the fans Freezers with a sequential defroster, such as JBT
industriels de l’agro-
had problems with snow build-up. On new JBT FoodTech’s GYRoCOMPACT self-stacking spiral
alimentaire de tirer de
FoodTech M-series freezers, the fans are located and FLoFREEZE IQF freezers, feature separate
leurs chaînes de
past the evaporator, eliminating this issue and its chambers that each have their own dedicated fan
fabrication un rendement
maximum. Mais de récents
potential to reduce run times. and evaporator. This enables the freezer to have
progrès permettent de
spare capacity available at all times so that one
Extended run times
maintenir les chaînes plus
evaporator and fan can be shut down to defrost
longtemps en
One technology developed nearly a quarter while the other chambers continue to operate.
fonctionnement, ce qui se century ago that remains an efficient option Due to higher purchase and utility costs,
traduit par un rendement
by JBT FoodTech is air defroster, or ADF, freezers with sequential defrost are not for
plus élevé - et donc une
technology. This technology, which sends a quick everyone. The constant cycling up and down
rentabilité supérieure.
shockwave of pressurised air to blow off the of temperatures to defrost the chambers and
inlet face of the coil and remove frost, can alone the increased use of waste water to clean the
Die Stillstandszeit,
die zum Abtauen von
Gefrieranlagen benötigt
wird, war schon
immer ein Hindernis
für Lebensmittel-
und Getränkever-
arbeitungsunternehmen
bei dem Bemühen,
Fig. 1.
die Effizienz ihrer
Produktionslinien zu
Frigoscandia
maximieren. Kürzlich
ADVANTEC
erfolgte Fortschritte
Impingement
sorgen jedoch dafür, dass freezer is a
Produktionslinien länger linear freezer
laufen können und einen
that freezes as
höheren Durchsatz und
fast or faster
damit auch eine größere
than cryogenic
Rentabilität erzielen.
freezing at lesser
total operating
cost.
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