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District Heating and Cooling including Combined Heat and Power

Annex IV Project 06

The Research / IEA DHC Annexes / 1993-1996 / Annex IV / Annex IV Project 06

Monitoring and Analysing Temperature Variations in District Heating Systems

Project Downloads


In order to make reasonable estimates of the maximum number of temperature load cycles when designing prestressed and self-induced prestressed preinsulated piping systems, it was proposed that the temperature variations in a number of existing DH systems be monitored and analysed. The result of the project should be a recommendation concerning temperatire load cycles converted to "full temperature cycles during the presumed lifetime".


The following measurements are to be performed for each utility:

  • Supply and return temperatures at production site
  • Suply and return temperatures at house connections

Data is to be collected from systems with multiple supply possibilities, with waste incineration and on house connection to consumers who use night-time set-back.

The data is to be analysed statistically, reduced to a homogenous form and converted to "full temperature cycles".

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