Una camera a termoigrometria controllata, a tre celle separabili, per misure di permeabilità al vapore

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Abstract

    [automatically translated] In this work it is described the design and realization of a new equipment for the experimental measures the vapor permeability of the materials. It 'been dimensioned, built and instrumented an air-conditioned box, according to the requirements of European legislation that deals with these trials. Such work is meant to represent the practice of discounting, as well as the continuation of a long series of studies addressed by forming a first set of equipment for vapor permeability tests on wood samples. Taking up these themes, the work covered by the following dissertation addresses a specific redesign of the previous air-conditioned rooms, in order to give a definitive realization, able to allow the execution of the tests of the vapor permeability of more materials of different types simultaneously. The new air-conditioned box, in fact, gives the possibility to carry out tests of this kind of three materials, independently, subject to the same climatic conditions. It is provided, furthermore, with the choice of all the components necessary for correct operation of the apparatus, with reference to the instruments relating to the acquisition of experimental data and those relating to the continuous control of the main parameters in play. The study of the thermo-hygrometric conditions of the air surrounding an object is very important in order to assess the effect of the latter is likely to cause any rapid deviations from the equilibrium conditions (between the object and the surrounding environment) of temperature and humidity; paying particular attention to the control of relative humidity, as is known, in different situations, the changes of this parameter lead to often irreparable damage to works of art, influencing, also, dimensions and shapes of the objects (the organic materials capable of absorbing water swell when the relative humidity increases and shrink when, instead, it decreases, with consequent deformations, variations of weight and breakage of the fibers), chemical processes (high values of relative humidity promote chemical reactions of weakening of organic fibers, textile and paper type, and discoloration of the dyes on silks, cottons and wool), biological processes (environments at temperatures above 20 ° C with humidity on more than 65% do facilitate the formation of mold, that the survival of many harmful insects). It can be said that the presence of liquid between the fibers of the material causes damage (corrosion of metals, formation of mold, rot of wooden parts); such damage can also become destructive, in the moment in which the water absorbed in the insulating layer comes to freezing. biological processes (environments at temperatures above 20 ° C with relative humidity over 65% do facilitate the formation of mold, that the survival of many harmful insects). It can be said that the presence of liquid between the fibers of the material causes damage (corrosion of metals, formation of mold, rot of wooden parts); such damage can also become destructive, in the moment in which the water absorbed in the insulating layer comes to freezing. biological processes (environments at temperatures above 20 ° C with relative humidity over 65% do facilitate the formation of mold, that the survival of many harmful insects). It can be said that the presence of liquid between the fibers of the material causes damage (corrosion of metals, formation of mold, rot of wooden parts); such damage can also become destructive, in the moment in which the water absorbed in the insulating layer comes to freezing.
    Original languageItalian
    Title of host publicationMemoria a stampa Università degli Studi di Palermo, Dipartimento di Ricerche Energetiche ed Ambientali (D.R.E.AM.)
    Number of pages15
    Publication statusPublished - 2002

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