USE OF WATER VAPOUR PERMEABLE FABRICS IN TENTS

Authors
  1. Cain, B.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The usefulness of a tent used in cold weather depends upon, among other things, the condensation of water vapour of the tent walls as this condensate can wet occupants' insulating garments, increase the tent weight and increase the tent's packed volume. In this report, the heat and moisture transport across a single fabric layer as might occur in a tent is studied by means of a simple, numerical model. The effects of water-vapour permeability of the fabric, interior air temperature and relative humidity and the ambient temperature on the condensation rate within the tent are examined. It was found that small decreases in the water-vapour permeability of the fabric layer can result in large increases in the condensation rate at the wall. The results indicate that a substantial portion of the water vapour within a very humid tent atmosphere escapes through the tent walls in all but the coldest ambient conditions for fabrics with low water-vapour resistance. TRUNCATED
Report Number
DREO-TN-90-27 — Technical Note
Date of publication
15 Oct 1990
Number of Pages
31
DSTKIM No
91-01274
CANDIS No
68483
Format(s):
Hardcopy;Originator's fiche received by DSIS

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