Share

THE SIGNIFICANCE OF WATER VAPOUR DIFFUSION FOR COLD LINE INSULATION USING CLOSED CELL ELASTOMERIC MATERIALS.

Author(s) : WOESS H. P.

Summary

ELASTOMERIC FOAMS ARE USED ON COLD LINES NOT ONLY AS THERMAL INSULATORS TO MINIMISE HEAT GAIN AND PREVENT SURFACE SWEATING. AN EQUALLY IMPORTANT FUNCTION IS THEIR ABILITY TO ACT AS BARRIERS AGAINST THE DIFFUSION OF WATER VAPOUR. THE OBJECTIVE OF THE PAPER IS TO CALL ATTENTION TO THE SECOND FUNCTION AND THE MATERIAL PROPERTIES CONTROLLING IT. THE STANDARD TESTS FOR MEASURING WATER-VAPOUR PERMEABILITY UNDER ISOTHERMAL CONDITIONS ARE CONTRASTED WITH TYPICAL COLD-LINE APPLICATIONS, WHERE WATER-VAPOUR DIFFUSION IS DRIVEN BY THE TEMPERATURE GRADIENT. THE MATERIALS SHOULD HAVE A WATER-VAPOUR-DIFFUSION RESISTANCE OF AT LEAST 2,500 TIMES THAT OF AIR IN ORDER TO PROVIDE ADEQUATE AND COST-EFFECTIVE PROTECTION AGAINST MOISTURE ABSORPTION.

Details

  • Original title: THE SIGNIFICANCE OF WATER VAPOUR DIFFUSION FOR COLD LINE INSULATION USING CLOSED CELL ELASTOMERIC MATERIALS.
  • Record ID : 1990-1400
  • Languages: English
  • Publication date: 1989/08/01
  • Source: Source: CLIMA 2000, Sarajevo
    vol. 1; 399-407; 4 ref.
  • Document available for consultation in the library of the IIR headquarters only.

Indexing