Diagnostic protocol for thermal performance of district heating pipes in operation. Part 1: Estimation of supply pipe temperature by measuring temperature at valves after shutdown
Journal article, 2021

This study evaluates temperatures measured at district heating (DH) valves in manholes and their usability for non-destructively assessing the thermal performance of buried DH pipes. The study was conducted as a field test in which part of a DH network was shut down and the temperature decline in the valves was analysed in terms of absolute temperature and thermal response time from the DH pipe to the top of the valve. The calculated and measured supply pipe temperatures by the drainage valves were in good agreement, with 1% deviation. The valve measurement analysis from this study shows that the drainage valve has good potential to serve as a measurement point for assessing the thermal status of a DH network. However, the shutdown valve measurements were greatly affected by the manhole environment.

District heating network

Non-destructive testing

Valve

Polyurethane

Thermal response time

Cooling method

Author

Peter Lidén

Chalmers, Architecture and Civil Engineering, Building Technology

Bijan Adl-Zarrabi

Chalmers, Architecture and Civil Engineering, Building Technology

Carl-Eric Hagentoft

Chalmers, Architecture and Civil Engineering, Building Technology

Energies

1996-1073 (ISSN)

Vol. 14 16 5192

Subject Categories

Energy Engineering

Other Civil Engineering

Building Technologies

DOI

10.3390/en14165192

More information

Latest update

9/8/2021 1