Abstract

State feedback control of a gas-fired hydronic heating system is studied. The system consists of a space heating circuit and a domestic hot water (DHW) circuit. Multiple input controllers are designed to regulate the mass flow rate of hot water flowing in both circuits and also to modulate the fuel firing rate in the burner. The control objective is to maintain the zone temperature and the DHW temperature close to some chosen setpoints. Comparisons are made between the output responses obtained from the state feedback controller with and without integral action.

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