Improving heat energy measurement using a feed-forward method for low power applications
2004 (English)Conference paper, Presentation (Refereed)
Heat measurement errors cause large revenue discrepancies in the district heating industry. Some of these errors are static and can be estimated using standard error analysis, but the largest error cause is the dynamic load such systems are subject to, as in the case of warm water tapping. The frequency at which heat meters estimate and update the energy is either constant or depends on the flow rate. They are often battery operated and their power consumption is proportional to their estimation frequency. Heat meters with a flow rate dependent estimation frequency are usually based on volume-flow meters. They are widely used in district heating due to their lower estimation frequency, which prolongs their battery life. Such devices are inaccurate especially at low flow rates. A Feed-forward method that measures the heat energy only when changes occur is presented in this paper.This method reduces the heat measurement error due to the dynamics of the system while minimizing the battery power consumption. The Feed-Forward method has been implemented and tested at cross-purposes with flow rate dependent heat meters in a Simulink model of a district heating substation.
Place, publisher, year, edition, pages
Research subject Industrial Electronics
IdentifiersURN: urn:nbn:se:ltu:diva-29645Local ID: 32f927d0-514e-11db-9592-000ea68e967bOAI: oai:DiVA.org:ltu-29645DiVA: diva2:1002869
International Symposium on District Heating and Cooling : 30/08/2004 - 31/08/2004
Godkänd; 2004; Bibliografisk uppgift: Sider: 243-249; 20060929 (ysko)2016-09-302016-09-30Bibliographically approved