NDLI: Elimination of oscillations in a central heating system using pump control

Content Provider	IEEE Xplore Digital Library
Author	Andersen, P. Pedersen, T.S. Stoustrup, J. Svensen, J. Lovmand, B. Bidstrup, N.
Copyright Year	2000
Description	Author affiliation: Dept. of Control Eng., Aalborg Univ., Denmark (Andersen, P.)
Abstract	In central heating systems with thermostatic valve temperature control it is a well known fact that room temperature oscillations may occur when the heat demand becomes low due to the nonlinear behavior of the control loop. This is not only discomforting but it also increases the energy cost of heating the room. Using the pump speed as an active part in control is it shown that the room temperature may be stabilized in a wider interval of heat demand. The idea is to control the pump speed in a way that keeps the thermostatic valve within a suitable operating area using an estimate of the valve position. The position is estimated from the pump terminals, using the pump flow and the pump differential pressure. The concept is tested on a small central heating test bench. The results show that it is possible to stabilize the room temperature even at part load conditions.
Starting Page	135
Ending Page	139
File Size	487422
Page Count	5
File Format	PDF
ISBN	0780355199
ISSN	07431619
DOI	10.1109/ACC.2000.878790
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-06-28
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Heat pumps Centralized control Temperature control Control systems Valves Water heating System testing Resistance heating Heat engines Boilers
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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