Appliance Design - April 2008 - (Page 21)

COOLING TECHNOLOGIES the cooler to be installed remotely. It can be independently serviceable and perform with maximum heat transport efficiency. The Twinbird/Coleman portable refrigerator/freezer uses this transport method to provide low-cost, high-efficiency performance in a recreational consumer product. (See Fig. 4.) Every one of the products thus mentioned use one or more of these methFig. 10. Cryopen cryosurgical device. ods in various combinations for heat lift and rejection to and from the FPSC. With the variety of FPSC models and integration methods available, the cost and performance of each design can be tailored to suit the specific needs of a particular design. < For more information, enter . . . . . . . . . . . . . . . . . 301 Or email: jedwards@globalcooling .com ONE SKU CAN TAKE YOU ANYWHERE Fig. 12. QM100 cools electronics in military application. can be quite effective for general purposes. However, the configuration has a disadvantage when compared to a Rankine system because it operates in a single phase. It is, therefore, limited to sensible heat and cannot take advantage of the latent heat properties of the fluid used. On the other hand, this configuration does have one advantage over Rankine in that the Stirling cooler can be serviced independently without requiring evacuation and recharging of the circulating loop. An example of this transport method can be seen in the QM100, manufactured by Global Cooling for electronics cooling in a military application. The most elegant and common solution for secondary heat transport is the thermosiphon, which is a special variant of a heat pipe. Basically, a thermosiphon is nothing more than a section of tubing, filled with a refrigerant. The refrigerant is at a constant density and remains two-phase throughout the entire assembly. Heat is absorbed by a phase-change and is returned to the condenser by buoyancy forces that transfer the absorbed heat into the cooler. The re-condensed liquid is then returned to the cold chamber by gravity in a continuous cycle. This transport method is inexpensive, can be environmentally friendly, and allows for www.applianceDESIGN.com FENWAL Gas Ignition Controls Give You Global Reach Our new 35-6X Series of microprocessor based gas ignition controls is certified for use in all major markets including North America, Europe and Australia. Easily installed, and with all the features you’ve come to expect from Fenwal, the 35-6X Series is offered in direct spark, hot surface and intermittent pilot versions and is ideal for commercial cooking, radiant/infrared heaters, boilers, furnaces, HVAC, and more. Certifications: Now your product can be a “globetrotter” with only one SKU. For MORE INFORMATION or to qualify for a FREE EVALUATION SAMPLE Call 508.881.2000 ext. 2104 or visit us at www.fenwalcontrols.com For more Information Enter 107 applianceDESIGN AD04084Fenwal.indd 1 April 2008 21 3/7/08 9:05:48 AM http://www.fenwalcontrols.com http://www.fenwalcontrols.com http://www.appliancedesign.com

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Appliance Design - April 2008 Contents Editorial Shipments/Forecasts News Watch A Variant of Thermoacoustic Refrigeration Known as Acoustic-Stirling is Expanding Its Range Outside Cryocooling Into More Conventional Applications Such As Refrigeration and Air Conditioning Free-Piston, Stirling Coolers Are Now Showing Up in Mainstream Applications As Costs Come Down and Heat Transport Solutions Are Devised Heat Exchanger Innovations Are Helping To Improve the Overall Efficiency of Vapor Compression Systems Environmental Concerns Have Once Again Ignited a Debate Over Refrigerants A New Glass Ceramic Material for Induction Cooktops Can Be Decorated In a Variety of Glimmering Metallic, 3-D Looks That Can Employ a Number of Shades, Patterns, Styles, Colors, Intensities, and Textures Colorful, Reflective Coatings for Glass Create a Variety of Design Options To Help Designers Establish a Unique Look for Their Products Appliance Designers Faced With Different Motor and Drive Options Need To Understand the Differences and Tradeoffs Before Choosing A New MEMS Valve Offers a Number of Advantages Over Solenoids In Certain Applications, Including the Opportunity To Cut Energy Use The AHR Expo Set Attendance Records and Showcased Thousands of Innovative New Products Classifieds Design Marts Advertiser’s Index Association Report: CEA

Appliance Design - April 2008

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