Consider a home heating system consisting of a naturalgas-fired furnace and a thermostat. In this case, theprocessconsists of the interior space to be heated. The thermostatcontains both the temperature sensor and the controller.The furnace is either on (heating) or off. Draw a schematic diagram for this control system. On your diagram, identify the controlled variables, manipulated variables, and disturbancevariables. Be sure to include several possible sources of disturbances that can affect room temperature.

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