wind chill

(redirected from Windchill)
Also found in: Dictionary, Medical, Wikipedia.
Related to Windchill: windchill factor

wind chill,

the cooling effect of wind and temperature combined, expressed in terms of the effect produced by a lower, windless temperature, also called wind chill factor, wind chill temperature, wind chill equivalent temperature, wind chill index, wind chill equivalent index, and wind chill temperature index. Wind chill is based on the rate of heat loss from exposed skin. Under windless conditions air provides an invisible blanket around the skin. As wind speed increases, this layer of heated air is carried away from the body at an accelerated rate, forcing the body either to work harder to generate more heat or cool down. If the actual air temperature is −5°F;(−21°C;) with a 20 mph (32 km/hr) wind, the wind chill temperature is −29°F;(−34°C;). Because wind chill is based the removal of heat from the human body, it does not reflect the increased rate of heat loss for inanimate objects such as automobile radiators under the same conditions but they also experience a faster heat loss with increasing winds.

The term wind chill was coined by the American geographer Paul A. Siple in his dissertation, Adaptation of the Explorer to the Climate of Antarctica, (1939). Subsequently, on the third Byrd Antarctic expedition, Siple and American geologist Charles Passel determined how quickly extreme conditions could produce frostbite on exposed skin. By 1945, Siple and Passel had published a set of numbers expressing heat loss as a function of temperature and wind speed.

A wind chill advisory is issued when the forecast projects a wind velocity of at least 10 mph (16 km/hr) producing a wind chill temperature of −15°F; or lower for 3 hours or more. At these values wind chill is more of a nuisance than it is life threatening. A wind chill warning is issued when the forecasted wind chill temperature is −25°F; or lower, which can be life threatening if the individual is not suitably dressed. Persons who go outside under such conditions may experience frostbite and other cold-related symptoms in a matter of minutes, even if properly clothed for normal winter conditions, and longer exposures may prove fatal.

wind chill

[′win ‚chil]
(meteorology)
That part of the total cooling of a body caused by air motion.
References in periodicals archive ?
He continues with, "We control the process by validating what has been migrated against the files already in Windchill, enable editing of attributes and manage model dependencies.
Continental will replace its existing PLM system and standardize its three automotive divisions -- Chassis & Safety, Powertrain and Interior -- on PTC's Windchill platform.
Nypro is installing a subset of PTC's Windchill Solution, called ProjectLink.
Windchill EPM is the first e-Business application focused on encouraging product innovation and connecting engineering to the broader extended enterprise.
Parametric also announced a technology and marketing agreement with Tecnomatix Technologies Ltd, and will use the Tecnomatix Digital Factory Process Model and computer-aided production engineering applications within Windchill to link product and process information management.
The Windchill will retail for a suggested $129 and fills a niche at the retail level for an economical, effective cooling system, according to Sean Holzman, vice president of sales and marketing for WindChaser.
PTC Windchill PDM Essentials is easy to deploy, containing everything a customer needs to get up and running - including a Microsoft SQL Server database - in one easy-to-install package.
PTC Windchill PDM Essentials is right-sized for the existing needs of smaller teams and companies.
With this new version of Windchill, we've not only enhanced a number of critical functional areas, but we've also made major improvements to the user experience and serviceability of the product across-the-board.
PTC's Windchill will consolidate multiple existing systems into a single platform for managing critical product data and related processes for vehicle development.