Appliance Design - July 2008 - (Page 16)

HEatING ElEmENtS Condensation would typically form when these doors are opened to the warmer store temperature, but these Termofrost doors from Schott clear the moisture. thermal-Clear heaters from minco deliver uniform watt density across the entire heater area. a toaster chars the carbon in the bread, and it takes a high blackbody temperature to do that. To perform this task, a toaster, with its glowing red wires consuming about 750 to 800 W, gets hotter, and hotter faster, than glass can get, says George Usinowicz, an application expert for Thermique Technologies, a subsidiary of EGP. Thermique Technologies recently released a new, freestanding glass towel warmer. The limitations on heat output limits the range of applications for heated glass, but use of the material is growing nonetheless in those areas where it is suitable. EGP, one of several companies making heated glass materials, targets its products for towel warmers, food display cases and architectural windows. Saint Gobain Glass of Germany makes heated glass for residential space-heating radiators, towel warmers and other products. Minco of Minneapolis, the Hatco cabinet keeps food hot with a warming shelf that allows the food to stay hot while being in full view of customers. 16 applianceDESIGN July 2008 makes ThermalClear, a heated glass product used primarily for LCD heaters. Anthony International uses heated glass primarily for commercial glass refrigerator and freezer doors, as does Schott Termofrost, Arriva, Sweden. Electrically heated glass maintains a steady and consistent temperature across the surface of the glass, especially when compared to traditional heating elements (see Fig. 1.). Heat radiates off of the glass toward the object to be warmed. The transparent heated glass has a wide temperature range that it can produce. Some heated glass manufacturers specify their products to warm to 350 DegF to 400 DegF. EGP’s heated glass products can reach 350 DegF and can be incorporated into the smooth surface of a cooktop for use as a burner to boil water and other stovetop cooking and warming applications. Beyond that, as temperatures near 500 DegF, there can be concerns about glass breakage as well as thermal expansion issues. The ability to produce various temperatures is important as each application has its own temperature requirements, says Paul Artwohl, vice president of engineering for Anthony International. A defogging application requires less heat than a food warming application. Freezer cabinets operate at temperatures as low as -20 DegF, which can www.applianceDESIGN.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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