Abstract
One of the most significant drawbacks of tankless gas water heaters is the difficulty of controlling the outlet hot water temperature as changes in water demand cannot be predicted. These sudden changes of hot water flow rate, associated with the system inhered delays, origins temperature overshoots and undershoots that severely affect the comfort perception by the user. In the present work, a linear MPC design is employed for the stabilization of a constrained nonlinear process with time-varying delay, however, control performance degrades significantly when operating far from the linearization operating point. The idea is to design multiple linear MPC controllers, each with its linear state-space model and constant time delay, describing process dynamics at a specific level of operation. Gain scheduling MPC presents improved performance when compared with classic PID and combined feedforward-feedback controllers, reducing the settling time up to two thirds.
Published Version
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