HEATING SYSTEMS
description
Transcript of HEATING SYSTEMS
![Page 1: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/1.jpg)
HEATING HEATING SYSTEMSSYSTEMS
![Page 2: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/2.jpg)
QuestionsQuestions• 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?
![Page 3: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/3.jpg)
How is the human body like a How is the human body like a heating system?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
![Page 4: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/4.jpg)
Desert Cottontail—how does the Desert Cottontail—how does the rabbit shed excess thermal rabbit shed excess thermal
energy?energy?
http://k43.pbase.com/o6/50/493350/1/81965672.V6e9SMLr.DesertCottontail7907web.jpg
Fur keeps the rabbit warm at night
Ears serve as heat radiators (see blood vessels)
![Page 5: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/5.jpg)
Function of a heating Function of a heating systemsystem
• 1. Burn a fuel• 2. Heat a fluid (air or water)• 3. Circulate a heated fluid• 4. Transfer thermal energy into a space
o By convection, conduction and radiation
![Page 6: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/6.jpg)
Heating SystemHeating System• Any device or process that transfers energy to a
substance to raise the temperature of the substance.
![Page 7: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/7.jpg)
The problem: HEAT The problem: HEAT FLOW FROM HOUSEFLOW FROM HOUSE
During cold days
![Page 8: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/8.jpg)
Three thermal energy Three thermal energy transfer methods in transfer methods in
action.action.
![Page 9: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/9.jpg)
Different types of Different types of heating systemsheating systems
• Radiant heating system• Forced-air heating system• Wood stove• Fireplace• Heat Pump• Circulation of geothermal fluids
![Page 10: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/10.jpg)
Radiant Heat SystemRadiant Heat System
Where does the thermal energy go?
![Page 11: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/11.jpg)
Forced-air Heating Forced-air Heating SystemSystem
![Page 12: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/12.jpg)
Solar Heating SystemSolar Heating System
![Page 13: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/13.jpg)
Wood StovesWood Stoves
![Page 14: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/14.jpg)
Geothermal Heating Geothermal Heating SystemsSystems
![Page 15: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/15.jpg)
Do you see where thermal energy is Do you see where thermal energy is
added to a fluid and can you find the added to a fluid and can you find the
exhaust?exhaust?
![Page 16: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/16.jpg)
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.diydata.com/projects/centralheating/balancing/balancing.htm
http://www.northridgevillehistoricalsociety.org/images/schoolinnorthw.jpg
http://www.totalcomfortnc.com/geo.htm
http://www.igshpa.okstate.edu/geothermal/geothermal.htm
![Page 17: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/17.jpg)
Heating Heating SystemsSystems
2nd law of thermodynamics—heat always flows from a hotter to a colder
substance
![Page 18: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/18.jpg)
![Page 19: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/19.jpg)
![Page 20: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/20.jpg)
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)
![Page 21: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/21.jpg)
Commom Fuel Commom Fuel Sources for HeatingSources for Heating
• Wood• Coal• Oil• Natural Gas (methane)
MethaneCH4
![Page 22: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/22.jpg)
Mid-1700’s to 1800’sMid-1700’s to 1800’s• Fireplace with brick• Franklin iron wood stove
• Fuel Source: wood
![Page 23: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/23.jpg)
1885-19001885-1900• Coal Boiler• Natural convection (no electricity for pumps)
• Fuel Source: coal
![Page 24: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/24.jpg)
1900-1930’s1900-1930’s• Coal Boiler • Circulated water or steam to radiators
• Fuel Source: coal
![Page 25: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/25.jpg)
1930’s -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
![Page 26: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/26.jpg)
1950’s --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)
![Page 27: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/27.jpg)
Burn a fuel
Heat a fluid
Circulate a heated fluid
radiator
Water-filled pipes
Radiant energy
90 F 150 F
Radiant Heating System
![Page 28: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/28.jpg)
Burn a fuel
Heat a fluid
Circulate a heated fluid
convection
Forced-air Heating System (can be adapted to central whole-house air conditioning)
![Page 29: HEATING SYSTEMS](https://reader036.fdocuments.in/reader036/viewer/2022062400/56815596550346895dc37215/html5/thumbnails/29.jpg)
Convection, Convection, Conduction or Conduction or
Radiation?Radiation?1. Stick in campfire2. Hot air balloon rising3. Hot concrete surface
at pool 4. Lizard sunning itself
on a rock5. Pan of soup warming
on the stove6. Foot on cold tile floor
• Conduction• Convection• Radiation
• Radiation
• Convection
• Conduction