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Journal of Building Physics
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The Wick-concept for Thermal Insulation of Cold Piping

Vit Koverdynsky

Brno University of Technology, Institute of Building Services, Veveri 95, Brno, 662 37, Czech Republic, vit.kov{at}email.cz

Vagn Korsgaard

Department of Civil Engineering, Technical University of Denmark, 2800 Lyngby, Denmark

Carsten Rode

Department of Civil Engineering, Technical University of Denmark, 2800 Lyngby, Denmark

The wick-concept for thermal insulation of cold piping is based on capillary suction of a fiber fabric to remove excess water from the pipe surface by transporting it to the outer surface of the insulation. From the surface of the insulation jacket, the water will evaporate to the ambient air. This will prevent long-term accumulation of moisture in the insulation material. The wick keeps the hydrophobic insulation dry, allowing it to maintain its thermal performance. The liquid moisture is kept only in the wick fabric.

This article presents the principle of operation of cold pipe insulation using the wick-concept in either of two variations: the self-drying or the self-sealing system. Experiments have been carried out using different variations of the two systems to investigate the conditions for exploiting the drying capabilities of the systems, and the results are presented. The results show that the variations of these types of insulation systems work for pipes with a temperature above 0 C and for ambient conditions within common ranges for industrial applications.

Key Words: Insulation • wick-concept • cold piping • moisture accumulation • refrigeration • air conditioning

Journal of Building Physics, Vol. 29, No. 4, 313-327 (2006)
DOI: 10.1177/1744259106061131
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