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House. Cold outside air house Heat loss Cold outside air.

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Presentation on theme: "House. Cold outside air house Heat loss Cold outside air."— Presentation transcript:

1 house

2 Cold outside air

3 house Heat loss Cold outside air

4 house Heat loss Cold outside air heater

5 house Heat loss Cold outside air heater Heat input

6 house Heat loss increases as the difference between inside & outside increases Cold outside air heater Heat input

7 house Heat loss increases as the difference between inside & outside increases Cold outside air heater Heater output and thermostat feedback to each other. When thermostat registers that the house temperature is below its setting, the heater turns on. When house temperature registers higher, the heater turns off.

8 Heat loss increases as the difference between inside & outside increases When thermostat registers that the house temperature is below its setting, the heater turns on. When house temperature registers higher, the heater turns off. Do you want to try to invent formulas for a spreadsheet that calculate the heat input, heat loss, and change in temperature? Yes -- on paper first (alt. address)Yes -- on paper firstalt. address Directly into a s’sheet (alt. address)into a s’sheetalt. address Skip this

9 house Cold outside air heater Thermostats turn the furnace off as soon as they register that the set temperature has been reached. Q: What happens if the thermostat only registers the temperature every minute? Every two minutes? Every four minutes?… Try it on paper? Or on your s’sheet? Or on mine?on paperon your s’sheeton mine

10 house Cold outside air heater Normal heaters pump in heat at a constant rate each minute, but some people act as if they pump in more heat when the thermostat is set higher than it needs to be. Q: What might happen if you had a heater like that? Try it on paper? Or on your s’sheet? Or on mine?on paperon your s’sheeton mine


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