Appliance Design - July 2008 - (Page 17)

HEatING ElEmENtS cool the surface temperature of the inside glass down to below 0 DegF. Condensation on the glass doors will form when the moisture laden warmer air of the store comes in contact with the colder glass surface, intersecting at the dew point. The dew point refers to the temperature at which water vapor in air at a given relative humidity will condense. For anti-fogging applications, it is only necessary to heat the glass just enough to keep it above the dew point to prevent condensation, Artwohl says. Alternatively, the surface can be coated with anti-fog coatings than can contain combinations of hydroscopic and hydrophilic properties. In many instances, a closed-loop control system is used to respond to changing conditions. EGP, Anthony International and others offer electronic controllers for their products. Schott Termofrost, for instance, offers the Eco-S system that works with its tin oxide-coated heated glass doors. With these systems, sensors monitor ambient temperature and humidity and electronically control the glass temperature to keep it at 1 DegF above dew point. SGG thermovit Elegance, Diamant model glass radiator is transparent. A closed loop control can save energy in two ways. It avoids heating the glass any more than necessary, and minimizes the heat load that heated glass can introduce into a refrigerated space, according to Artwohl. Heated glass not only works on large-scale applications such as refrigerator and freezer display cases, but also on smaller applications such as LCD heaters. In LCDs that are used outside, the need to heat LCDs are critical to Global Leader in Providing Electronic and System Solutions Diehl AKO Stiftung & Co. KG Pfannerstraße 75 D-88239 Wangen i.A. - Germany Phone +49 (75 22) 73-0 Fax +49 (75 22) 73-2 50 info@diehlako.com www.diehlako.com Diehl Controls North America Inc. 1842 Centre Point Circle, Suite 110-S At Diehl Road Naperville, IL 60563 USA Phone +1 630 955 9055 Fax +1 630 955 9065 www.diehlako.com AD07084Diehl.indd 1 5/29/08 9:24:39 AM www.applianceDESIGN.com applianceDESIGN July 2008 17 http://www.diehlako.com http://www.diehlako.com http://www.diehlako.com http://www.appliancedesign.com

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Appliance Design - July 2008 Contents Editorial Shipments/Forecasts News Watch Heating Elements Gas Technology Motors & Pumps Controls & Sensors Design Marts Association Report: AHAM Advertiser's Index

Appliance Design - July 2008

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