Assistant Professor of Construction Trades Technology Michael Warm Water Heating to Save Energy 3 Ways to Transfer Heat Hydronic Heating (hot water baseboard) typically heats with 210 to 180⁰ F water in the winter and 180 to 160⁰ in the summer. Typically, systems waste 25 to 80% of their fuel by releasing the energy (burning the fuel) unnecessarily. Heating with too hot of water creates a stratification where the ceiling is significantly warmer than the floor by 5- 15⁰. Heat Emitt er Convectio n Radiant Conducti on
Transcript
Assistant Professor of Construction Trades Technology Michael Hirt ~ University of Alaska Fairbanks
Warm Water Heating to Save Energy
3 Ways to Transfer Heat
Hydronic Heating (hot water baseboard) typically heats with 210 to 180⁰ F water in the winter and 180 to 160⁰ in the summer. Typically, systems waste 25 to 80% of their fuel by releasing the energy (burning the fuel) unnecessarily.
Heating with too hot of water creates a stratification where the ceiling is significantly warmer than the floor by 5-15⁰.
Heat Emitte
r
Convectio
n
Radiant
Conduction
Heat Emitter
Convectio
n
Convection – hot air (gas) or water (liquid) rising. Hot ceilings, cool floors. Useful with tall, high mass storage tanks but not so useful in our living rooms.
Heat Emitte
r
Conduction
Conduction – direct and indirect contact.
Heat Emitte
r
Radiant
Radiant – infrared rays emit from a warmer object(s) to cooler object(s) and only heat the air indirectly. Heating with radiant heat (warm instead of hot) creates an opposite stratification that is warm on the floor and cooler on the ceiling.
High mass emitters and modern controls can seek the coolest temperature to heat with depending on outdoor and indoor conditions, making the home more comfortable and saving the maximum amount of fuel.
Alternate fuel can save us money but should only be considered after our Heat Energy has been controlled. There may be more savings controlling our heat energy, and less expense, than going to an alternate energy. Either way should be focused on saving energy not just dollars.
University of Alaska Fairbanks and Michael Hirt do not own the images within the presentation and hold no copyrights to the images.
• For every 3° you drop your boiler temperature, you save 1% on fuel
• Most systems, where attempts have been made to save, are doing some form of dropping the average boiler temperature. o Cold start boiler - shuts off between demands cycleso Set back T-statso Burner cycle modification (Heat Manager, Intellicon)o Partial Temperature Modificationo Warm Weather Shut Down (Tekmar)o Outdoor Reset Control (Tekmar, Honeywell)o Indoor Reset Control (Tekmar)
• All energy saving devices are “swallowed up” by Full Temperature Modulation and Condensing Boilers
