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NORA Oilheat Technicians Manual

Chapter 16 Energy Conservation Draft Regulator 16-10 Energy Conservation large surface area through which heat can be lost. Second, warm air can escape directly from leaky joints in the ducting. According to studies by the US Department of Energy, ducting losses can be as high as 40%. The level of heat loss is different for each system and it depends upon the placement of ducts within the house. Warm air ducts in cold areas such as unheated basements, attics, or crawl spaces must always be insulated and all joints must be sealed. Outdoor air infiltration The air that goes up the chimney must be replaced by cold outdoor air drawn into the building. This cold air must be heated to indoor temperature, Figure 16-6. The amount of heat needed to heat this cold Figure 16-6: Outdoor air infiltration induced by heating system Typical Heat Losses For Oil-Fired Hydronic Boilers Actual Losses Vary From System To System Useful Heat To House (76% to as low as 40%) Useful Heat To House (86% ) Figure 16-7: Typical heat losses for oil fired heating units Heated Air and Exhaust Gases Indoor Air 70°F Cold Outdoor Air Enters House to Replace Exhausted Air House Exhausted Air by Heating Unit and Chimney Outdoor Air 0 - 60°F To Draft Damper To Burner Boiler Fuel Tank Chimney On-cycle Flue Loss (16-22%) Off-cycle Flue Loss (6-20%) Distribution Loss (0-40%) Air Infiltration Loss (0-16%) Jacket Loss (2-6%) On-cycle Flue Loss (12%) Off-cycle Flue Loss (2-3%) Distribution Loss (0%) Air Infiltration Loss (0%) Jacket Loss (0-1%) Fuel Energy 100% Typical Installation/Efficiency Fuel Energy 100% High Efficiency/Properly Installed


NORA Oilheat Technicians Manual
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