Precision air conditioning for Textile Laboratories Branca
After a long time experience in laboratory projects, Branca Idealair starts-up new developments and realizations of accreditated textile testing laboratories equipped with the Branca climatic units able to assure constant climatic conditions 24 hours per day allowing the uniformity of conditions in every point of the lab both for the preparation of textile materials and for the reproducibility of tests carried out.
The most accurate control on chemical and physico-mechanical properties for textile products is definitely the Keyword of the Modern Textile Industry that has to reach highest levels of Quality for textile products in an extremely competitive international trades. Tests and analyses on textile materials require to be carried out in a air conditioned room, thus obtaining test results more precise, more comparable and obviously repeatable at International Level.
Before submitting any textile materials under examination, samples need to be collected to a suitable pre-conditioning and after then they must be stored inside a room at a Standard Atmosphere for a certain period according to the features of textile material and also for the specific tests that has to be carried out.
For Textile Laboratories, the norm ISO 139 defines that the "Standard Atmosphere" has to be fixed at a reference temperature of 20 °C and a relative humidity of 65%; additionally the norm sets the following limits or tolerances for thermo-hygrometric variability:
Laboratory temperature and R.H.(%) should be recorded periodically with a continuous data collection recorder or data-logger keeping under control the previous acceptable limits upper cited. The monitor of room conditions should be analyzed by independent probes from those used for air conditioning control (ISO 139 par. 5.2); these sensors must be compatible with technical details of requested parameters and the uncertainties of measurement tolerances specified for analog variables.
In other Textile application fields includes a complementary Standard Atmosphere characterized by a Temperature of 23°C and a R.H. of 50%.
The Standard ISO 139 provides that the temperature spatial variations inside a Textile laboratory must be kept inside the specified tolerances upper cited and should be checked periodically through the mapping of the laboratory with a certified psychro-meter; in order to obtain spatial variations contained inside closed tolerances it is essential to have an air conditioning system that is able to convey the air into the laboratory at a very low speed, less or equal than 0,15 m/s.
At International level, the British Standards BS 4194: 1967 provides two types of tolerances inside a laboratory fixing the constant Temperature at 20°C and the constant Relative humidity at 65%:
TOLERANCE 'TYPE 1'
TOLERANCE 'TYPE 2'
For the American Standards, the norm ASTM D123-58 requires that Standard Atmosphere for textile materials is set at:
All the Standards on textile materials define admitted ranges of Temperature(°C) and R.H.(%) inside the laboratories, but they must highlight that the air conditioning systems, which have to maintain these acceptable limits, must operate with a closer variable control on Temperature too.
The temperature variations (in equal amount of water vapour) generate variations in the R.H. (%) too in particular when the heating and cooling performances cause the decrease of the R.H. (%) .
EXAMPLE: A Textile laboratory requires a Temperature of 20°C and RH of 65% to perform the tests on universal testing machines, but the ambient conditions are not stable and all tests results have a statistical trend graph deviations; what causes the unstable conditions of the laboratory?
A Temperature variation of ± 1°C leads to a RH variation of ± 4%, then it is absolutely necessary to reduce the Temperature oscillations the closest as possible instead of those prescribed by the regulations. It is also essential that an air conditioning system controls the temperature and RH with a P.I.D. adjustment in order to have a real value of temperature and RH within tolerances.
STA Branca Idealair offers two options in relation to the needs of the Customer:
Solution "A": AIR CLIMATIC UNIT
To obtain an overall coverage of all requirements required by the Standards and to reach and maintain constant laboratory conditions within acceptable limits; the air conditioning across the CLIMATIC ELEMENT TYPE is able to ensure at every laboratory volume the following thermo-hygrometric variables:
Please specify the "Laboratory air volume (m3)" that has to be conditioned:
Solution "B": CLIMATIC UNIT SIMPLEX - Branca Idealair
For a partial compliance with the requirements described by the norms, the air conditioning system is based on the Climatic Element "SIMPLEX" that, without any particular constraint on the structure of the laboratory, is able to guarantee the following thermohygrometric parameters:
Solution "C": STANDARD ATMOSPHERE - Branca Idealair
The optimal solution for the conditioning of any type of testing sample with uniformity of temperature and relative humidity. Designed for customers who have no need to condition a laboratory with considerable dimensions but however they need to condition their samples or products.
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