ECADEMY

Autoadapt in depth

Grundfos-autoadapt-heating-task7

Adaptive selection of control-curves for domestic circulators

Carsten Skovmose Kallesøe*, Niels Bidstrup*, Manfred Bayer

Abstract

Speed controlled circulators for domestic heating system have been on the market since the early nineties. The majority of these circulators have built-in pump control curves, which adjust the speed and thereby the pressure to the actual flow and heat demand. Circulators normally have a variety of pump control curves to accommodate for variations in heating systems. This can further improve comfort and reduce energy consumption. To benefit from this option the right setting of the circulator pump control curve must be done after it is installed. In most cases this is not possible, because information about the particular heating system is not available. This paper describes a new control method - AUTOADAPT, which automatically adapts the setting of the circulator to the heating system where it is installed. Circulators with AUTOADAPT function measure and analyse the heating system characteristics during operation and adjust the setting of the pump control curve accordingly. Field test results from Germany have shown that in 75% of the cases the AUTOADAPT had chosen a setting same comfort level and lower energy consumption.

* Grundfos Management A/S, Poul Due Jensens Vej 7, DK-8850 Bjerringbro, Denmark (e-mail {ckallesoe,nbidstrup}@grundfos.com)

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