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Rule-based thermostat design for night setback of heat pumps

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  • Rutz, Allen L.
  • Moran, Michael J.

Abstract

We introduce a computer model for testing heat-pump thermostat performance with regard to energy and cost savings due to night setback. Also introduced are two new control strategies for heat-pump night setback: 1.(i) an inexpensive variation of existing control strategies and2.(ii) a rule-based control strategy using techniques of artificial intelligence. The computer model is based on a transient system model of the residence, heat-pump, and controller, in response to actual weather data. Seasonal energy usage and costs are computed for each control strategy, subject to the effects of variable heat-pump sizing, building thermal inertia, building heat loss, climatic region, and electric rate structure. Results show that night setback can reduce heating season costs in residential heat-pump systems if the control strategy takes into account the characteristics of both the heat-pump system and the building. If these factors are not considered, night setback can increase heat-pump operating costs. The rule-based control strategy consistently provides positive cost savings above other setback methods, and has the added potential of providing diagnostic information about both the heat-pump system and the residence.

Suggested Citation

  • Rutz, Allen L. & Moran, Michael J., 1990. "Rule-based thermostat design for night setback of heat pumps," Energy, Elsevier, vol. 15(11), pages 935-941.
    • Handle: RePEc:eee:energy:v:15:y:1990:i:11:p:935-941
    DOI: 10.1016/0360-5442(90)90018-W
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