15
Impact of
Air DistributionChilled
Storage
International Soft Fruit Conference (ISFC)’s-Hertogenbosch (NL), January 12th, 2017 - Dr.ir. G.J. Doornbos
Consultant
Cooled Product Refrigeration
Lector and TeacherPost-Bachelor Course on Refrigeration
Thirty years in Refrigeration
Design, Research, Education
Introducing…
• Food
• Fresh water
• Income
Most problems distribution related:
Air Distribution - ISFC 2017
Like chilling soft fruit, most distributions should be even!
•Nuclear technology
•National budget
•Refugees (in Europe)
• No “hot spots”
• No color differences (banana’s)
• Equal ripeness
• Equal expected shelf life
• Lowest energy consumption
Why even air distribution?
Air Distribution - ISFC 2017
• Stack pallets thight to each other
• Tarp or air bag should fit and close well
• All boxes equal in size and well filled
Drawing Pre-chilling:
avoid leakages!
Air Distribution - ISFC 2017
• Stack pallets at even spacing (5-10 cm)
• Avoid blockage of main air
• Avoid touching the wall
General Pre-chilling:
equally spaced!
Air Distribution - ISFC 2017
General storage:
Keep your distance!
Air Distribution - ISFC 2017
Equipment selection & Room design
Air Distribution - ISFC 2017
• Sufficient air throw from air cooler
• Avoid air blockage
Equipment selection & Room design
Air Distribution - ISFC 2017
Avoid preference air throw to left/right by:
guide vanes or L + R rotating fans
Equipment selection & Room design
3 fans
2 fans
Air Distribution - ISFC 2017
• Poor design: fan unit serves part of air cooler
• Defrost air cooler: check regularly!
• Avoid spluttering (fan speed, defrost sequence)
Equipment design and operation:
air maldistribution
Air Distribution - ISFC 2017
• General guidelines to avoid maldistribution have been given
• Great need to show air flow examples
• Great need to facilitate prediction air flow by:Readily available tools (www.koudecentraal.nl)
Friction data of air flow in cold rooms
Conclusions
Air Distribution - ISFC 2017
• Anon., De fruitteelt onder glas, UR e-depot, doc. 390885, 1947• Anon., Air Throw Measurements, Fincoil Teollisuus Oy, 2003 • Beek, G. van e.a., Het microklimaat in een kist, afhankelijk van het macroklimaat, Koeltechniek
67 (December 1974), 181-184• Bøgh-Sørensen, Leif, Recommendations for chilled storage of perishable produce, IIR Paris, 2000,
ISBN 2-913149-09-X• Ernens, Ben, Behoud vruchtkwaliteit tegen lagere energiekosten, Fruitteelt 101 (May 2011), 14-
15• FAO, Cold Stores, http://www.fao.org/3/contents/19deb470-de18-5d73-92ce-
a2caefdac8ea/v3630e08.htm• Fockens, F.H., e.a., Kwaliteitsbehoud bij opslag van agrarische producten, Koeltechniek 66 (Juli
1973), 184-192• Geijn, Frank van de, Geluid van het fruit, RCC K&L 106, (January 2013), 15-18• Melhorn, A., Hemp K., Aaardappelbewaring met propaankoelinstallatie, RCC K&L 109
(November 2016), 49-51• Post HBO Koudetechniek, De gekoelde ruimte, http://www.posthbokoudetechniek.nl/
References
Air Distribution - ISFC 2017
Adress: Veesser Enkweg 228194 LM Veessen (NL)
Telephone: +31 578 63 1707Cell phone: +31 6 513 68 250
E-mail: [email protected]
CoC: 646979237VAT: NL044723854B01IBAN: NL74 RABO 0308 4383 53
