Cold Weather Catalog - Chromalox Precision Heat and Control

TechnicalTechnical InformationWatt Density for Typical Applications vs. Temperature RiseDensity Watts / Square FootDesired Comfort Tmperature Rise ˚FApplication Condition 5°F 10°F 15°F 20°F 25°FIndoor Supplementry Heat15 to 30 Watts / Square FootIndoor Personnel Comfort No Drafts/No Cold Walls 5 to 6 11 to 13 17 to 20 22 to 26 28 to 33Indoor Personnel Comfort Average Conditions 7 to 9 15 to 18 23 to 28 30 to 36 39 to 47Indoor Personnel Comfort Drafty Are/Cold Walls 10 to 12 20 to 24 30 to 36 40 to 48 50 to 60Indoor Personnel Comfort Large Mall Type Buildings 40 TO 60 WATTS / SQUARE FOOTIndoor Moisture Removal and Control 15 TO 30 WATTS / SQUARE FOOTOutdoor Loading Dock Protected Area W/Wind Shield 80 TO 120 WATTS / SQUARE FOOTOutdoor Marquee Heating Snow & Ice Melting Use Table B20 ft. Mounting Hgt.TECHNICALOutdoor Personnel Comfort Not Open To Sky 10 to 12 20 to 24 30 to 36 40 to 48 50 to 60Protected Area No WindRadiant Fixtures for spot heating of individuals should be mounted 10 to 12 feet from the fl oor with coverage from at least two (2) sidesand directed at the individuals waist and never directly overhead. If fi xture must be mounted over 12' from the fl oor, add 25% to theindicated watt density up to a maximum of 15'.Snow Control Design GuidelinesOutside Design Annual Snowfall Exposed* Semi-Protected* Protected*Temperature (˚F) Inches w/ sq.ft. w/ sq.ft. w/ sq.ft.-20 to -60 80 to 115 200 185 160-20 to -60 50 to 79 175 160 145-20 to -60 20 to 49 125 110 100-20 to -60 10 to 19 110 100 90-20 to -60 0 to 9 100 90 85-10 to -19 80 to 115 175 160 145-10 to -19 50 to 79 125 110 100-10 to -19 20 to 49 110 100 90-10 to -19 10 to 19 100 90 85-10 to -19 0 to 9 100 80 750 to -9 80 to 115 125 110 1000 to -9 50 to 79 110 100 900 to -9 20 to 49 100 90 850 to -9 10 to 19 100 80 750 to -9 0 to 9 100 70 6519 to 1 80 to 115 110 100 9019 to 1 50 to79 100 90 8519 to 1 20 to 49 100 80 7519 to 1 10 to 19 100 70 6519 to 1 0 to 9 100 70 6040 to 18 80 to 115 100 70 6040 to 18 50 to 79 100 70 6040 to 18 20 to 49 100 70 6040 to 18 10 to 19 100 70 6040 to 18 0 to 9 100 70 60* Exposed = Totally open area* Semi-Protected = One side closed plus roof or overhang* Protected = Three sides plus roof or overhangHeater Selection Guidelines1. Always use clear quartz lamps as the correct element selection2. Use CRDS or CRTS stainless steel enclosures for outdoor locations3. For best results use 30˚ symmetric units. 60˚ symmetric or assymetricenclosures are generally satisfactory in semi-protected or shieldedareas. Never use 90˚ refl ectors.187