Trevor Thompson Senior Project II Vermont Technical College Spring 2011

Inefficient heat distribution from the living room woodstove to other rooms in the house resulting in ~7 degree delta in temperature between the living room and the nursery (room 1). Hot water heater stays on all day when no one is home and at night when not in use. Living Room ~70 deg ~63 deg Room 1 Room 2 Room 3 Room 4 House Layout Room 5

Design a heat distribution system that takes heat provided from the living room wood stove and distributes it to other rooms when called for. If the temperatures are not being met the controller will trigger the furnace to turn on to compensate. The controller will also shut down the hot water heater during late night hours and during the week when no one is home. Room 1 Room 4 Room 2Room 3 Living Room Controller V(T) Actuator room 5 Damper V(T) Actuator Damper ActuatorDamper ActuatorDamper Furnace Hot Water Heater Room 5

Main Blower Room 4 Thermistor Room 2 Thermistor Room 3 Thermistor Room 1 Actuator Room 1 Damper Room 2 Damper Room 3 Damper Room 4 Damper Room 1 Thermistor Room 5 Thermistor Room 5 Relay Room 5 Damper Room 2 Actuator Room 3 Actuator Room 4 Actuator Hot Water Heater Furnace Computer 0-10V Signal Ethernet Port 10K Type 3 24VAC

Step 4: Design Returns to Circulate Air Flow Step 1 Step 3: Calculate Required Duct Size Main Trunk = 12 inch diameter Branches = 6 inch diameter Step cfm

 Controller will read thermistor temperatures for each room to determine when setpoints need to be met and open dampers to reach setpoints.  If multiple rooms are calling for heat the controller will reduce damper angles closer to the heat source by adjusting actuators so more air flow is allowed to reach end branches.  If temperature setpoints aren’t met the controller will turn on secondary heat source to compensate.  The controller will also shut down the hot water heater during hours not used ie – late at night, during working hours, while on vacation.

Flue Damper Duct Actuator Controllable Damper Assembly Damper Assembly