Furnace
The house cools down, the thermostat clicks the furance on. The furnace heats the house, the thermostat clicks the furnace off.
The temperature inside a house is directly proportional to the amount of heat in the house. The amount of heat is the integral over time of the net accumulation of heat in the house. Net accumulation is the difference between heat added by the furnace and heat lost to the outside world. The furnace is controlled by a thermostat.
The independent variable is time in minutes.
Units for heat are kilocalories. Units for house volume are cubic meters.
It takes 4.98 kCal to heat 22.4 kMol of air 1 degree K. 22.4 kMol of air occupies 22.4 cubic meters. Thus, 1 kiloCal of heat in a cubic meter has a temperature of 4.5 degrees K.
Right click here to download Furnace 2005.DES (See note below for download instructions)
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