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HEATING SYSTEMS

HEATING SYSTEMS. Questions. Why do we need heating systems? What was the first heating system? Which types of energy do you need to operate today’s heating systems?. How is the human body like a heating system?. Purpose of a heating system

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HEATING SYSTEMS

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  1. HEATING SYSTEMS

  2. Questions • Why do we need heating systems? • What was the first heating system? • Which types of energy do you need to operate today’s heating systems?

  3. How is the human body like a heating system? • Purpose of a heating system • Comparison of components in a radiant heat system vs. the human body • Seasonal heat flow associated with your house and your body • Purpose of insulation

  4. Desert Cottontail—how does the rabbit shed excess thermal energy? Ears serve as heat radiators (see blood vessels) Fur keeps the rabbit warm at night http://k43.pbase.com/o6/50/493350/1/81965672.V6e9SMLr.DesertCottontail7907web.jpg

  5. Function of a heating system • 1. Burn a fuel • 2. Heat a fluid (air or water) • 3. Circulate a heated fluid • 4. Transfer thermal energy into a space • By convection, conduction and radiation

  6. Heating System • Any device or process that transfers energy to a substance to raise the temperature of the substance.

  7. The problem: HEAT FLOW FROM HOUSE During cold days

  8. Three thermal energy transfer methods in action.

  9. Different types of heating systems • Radiant heating system • Forced-air heating system • Wood stove • Fireplace • Heat Pump • Circulation of geothermal fluids

  10. Radiant Heat System Where does the thermal energy go?

  11. Forced-air Heating System

  12. Solar Heating System

  13. Wood Stoves

  14. Geothermal Heating Systems

  15. Do you see where thermal energy is added to a fluid and can you find the exhaust?

  16. http://www.hometips.com/hyhw/comfort/38comf.html http://www.woodfloorsonline.com/techtalk/woodwater7.html http://www.greenenergy.org.uk/sta/solarenergy/howwork.htm http://www.totalcomfortnc.com/geo.htm http://www.diydata.com/projects/centralheating/balancing/balancing.htm http://www.northridgevillehistoricalsociety.org/images/schoolinnorthw.jpg http://www.igshpa.okstate.edu/geothermal/geothermal.htm

  17. Heating Systems 2nd law of thermodynamics—heat always flows from a hotter to a colder substance

  18. Explain why the heat flow for a home is different in the winter vs. the summer. Summer– outdoor air temperature is greater than indoor air temperature (flow is from outside in) Winter—indoor temperature is greater than outdoor temperature (flow is from inside out)

  19. Commom Fuel Sources for Heating • Wood • Coal • Oil • Natural Gas (methane) Methane CH4

  20. Mid-1700’s to 1800’s • Fireplace with brick • Franklin iron wood stove • Fuel Source: wood

  21. 1885-1900 • Coal Boiler • Natural convection (no electricity for pumps) • Fuel Source: coal

  22. 1900-1930’s • Coal Boiler • Circulated water or steam to radiators • Fuel Source: coal

  23. 1930’s - • Radiant Heat and Forced Air Heating Systems • Circulated “heated” water or steam to radiators and “heated” air through ducts to registers • Fuel Source: natural gas and oil

  24. 1950’s -- • Trend towards forced air heating systems to accommodate central air conditioning • Fuel Source: forced air heating(natural gas) • Air conditioning (electricity from coal)

  25. Radiant Heating System radiator Radiant energy Water-filled pipes 90 F 150 F Heat a fluid Circulate a heated fluid Burn a fuel

  26. Forced-air Heating System (can be adapted to central whole-house air conditioning) convection Circulate a heated fluid Heat a fluid Burn a fuel

  27. Convection, Conduction or Radiation? • Conduction • Convection • Radiation • Radiation • Convection • Conduction • Stick in campfire • Hot air balloon rising • Hot concrete surface at pool • Lizard sunning itself on a rock • Pan of soup warming on the stove • Foot on cold tile floor

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