DEVELOPMENT OF A PAVEMENT HEATING SYSTEM TO REMOVE SNOW FROM AIRPORT RUNWAY INSET LIGHTS.
MELPAR INC FALLS CHURCH VA
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The heating requirements for snow melting were found to vary widely with meteorological conditions. A satisfactory method of determining heating requirements for a location is presented this method is based on the ASHRAE Guide and Data Book. For airport use, a system adequate for 98 of the snowfall hours was selected for snow removal in front of inset lights. Some minor snow accumulation may occur during severe storms, but such severe conditions would limit runway use for reasons other than snow accumulation during this time period. Electrical heaters and a simple heat pump were installed at NAFEC for evaluation. The heat pump consisted of an inverted L-shaped sealed pipe which contained liquid ammonia, in the vertical leg. It was found that simple hairpin, or W-shaped, electrical heater patterns operated at 25 to 50 watts per lineal foot at a depth of 1 inch were satisfactory for both asphalt and concrete surfaces. The heat-pump design, as used, was not adequate for the performance desired however, a redesign should increase its heating capacity. The cost for installing an electrical heater, the necessary supply wiring, and the transformers was estimated at about 200 each for a typical all-weather runway. For a heat pump of adequate design, costs of 200 to 300 each are estimated on the same basis. Hydronic heating systems were studied, but discarded as excessively expensive. Further evaluation of the problems of wind- or jet-blown snow and its accumulation over the heated area were recommended.
- Terminal Flight Facilities
- Air Conditioning, Heating, Lighting and Ventilating