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Development of a Water-to-Water Heat Pump COP Optimizer


J. Karjalainen

Master Thesis, SS16 (10496)

This master's thesis explores the energy saving potential of an online COP optimizer for a water-to-water heat pump application in simulation. Based on a literature review of existing optimization methods for HVAC plants, a model-free extremum seeking control scheme is selected. Following the selection of the optimization approach, a three-input multivariable perturbation-based extremum seeking controller is developed on top of a variable speed decoupling-MIMO feedback control scheme, and is tested with a heat pump model from the Thermolib-toolbox in Matlab/Simulink. The extremum seeking algorithm attempts to guide the system to an optimal combination of condenser and evaporator pump speeds and compressor speed based on the total power consumption of the water-to-water heat pump while tracking the heating demand. The performance of the optimization scheme is benchmarked against the mere feedback controller in several di erent simulation cases. The results of the simulation study show up to 12.2% COP improvement and up to 11% electricity saving by the extremum seeking controller scheme in comparison to the benchmark.

Supervisors: Ralph Evins (EMPA), John Lygeros


Type of Publication:

(12)Diploma/Master Thesis

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2016:IFA_5460
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