Non-destructive methods for assessment of district heating pipes: a pre-study for selection of proper methods

Paper in proceeding, 2017

Many energy companies are facing renewal of their district heating and cooling (DHC) network. However, there are no non destructive methods to determine the performance of existing pre-insulated pipes during operation. A pre-study has led to a selection of a couple of non-destructive methods that will be further evaluated and tested in field and in laboratory. Two non-destructive methods, individually or in combination, are considered interesting for further studies. A cooling method and a method for evaluation of the temperature coefficient of resistance (TCR), which aims at using the existing copper wire in pre-insulated pipes.