An intelligent environmental controller for R2000 residential homes

This paper presents research into the design and implementation of an environmental controller for energy-efficient passive solar homes. The device is a user-friendly adaptive controller which allows extensive parameterization of the controlled space. Controller software provides capabilities for a seven-day, four-temperature setback thermostat. Control routines allow for the optimization of the passive solar gains experienced during the heating season. The software also includes the capability to avoid dew-point violations on the interior window glass which lead to condensation. Finally, overall indoor air quality is maintained by watchdog software which ensures adherence to ventilation guidelines. The control strategy was implemented using standard VLSI vendor technology and has resulted in a comprehensive, yet user-friendly, system. The unit has been operating in an R2000 test site for two years with highly successful results.