Automatic temperature and humidity regulation – Humidity control
Patent
1997-05-06
1999-08-03
Tanner, Harry B.
Automatic temperature and humidity regulation
Humidity control
236 493, 236 91C, 236 91F, 165251, F24F 0000
Patent
active
059313765
DESCRIPTION:
BRIEF SUMMARY
This application is a national stage application, according to Chapter II of the Patent Cooperation Treaty. This application claims the priority date of Nov. 7, 1994, for Swiss Patent Application No. 03 312/94-3.
The invention relates to a device for air-conditioning control in an air-conditioned room having textile machines in a textile operation.
In spinning operations, air conditioning systems for controlling the temperature and the relative humidity in the spinning room, which is equipped with various textile machines, is an absolute precondition for normal production operation. During the processing of fibers to form yarn, a relative humidity is to be maintained in a narrow band width range of 40% rH to 50% rH, whereas the processing of yarns to form fabrics and knitted products requires a rather higher air humidity of 60% rH to 80% rH. However, condensation must never occur, and on the other hand the air humidity is also not to fall below 30% rH, even for a brief period. Since as is known the relative humidity and the temperature are related to each other according to the so-called Mollier diagram, it is moreover necessary for the temperature of the air in the room likewise to be controlled within a narrow band width by the air conditioning system. The highest requirements on the air conditioning are placed by the combination of modern ring spinning machines and spooling machines. The two machines are set up directly alongside each other in the spinning room, but require different air conditioning. The ring spinning machine is particularly sensitive to the relative humidity of the air: an air humidity of more than 50% rH leads to the formation of fiber laps on the drafting mechanism cylinders and top rollers of the drafting mechanism. On the other hand, too dry an environment promotes the formation of fiber lint, which can cause disturbances at various locations on the ring spinning machine. For its part, the spooling machine prefers a compliant yarn with a low tendency to snarling, and hence a rather moist climate. In the case of this machine, it is a case of preventing the shifting of fibers along the filament and production of filament loops and snarls, which can lead to disturbances in the spooling machine.
The combination of ring spinning machine and spooling machine also places high requirements on the air conditioning in relation to the loading on the air. The ring spinning machine, with its open spinning points, continuously emits fibers to the environment. In order to protect the health of the operating personnel, the ambient air must therefore be exchanged frequently. In addition, both machines dissipate a considerable power loss to the environment, with the result that the air in the spinning room must be fundamentally cooled by the air conditioning system, be it by means of moistening or additionally by means of cooling units.
With the introduction of high-capacity ring spinning machines, which have over 1000 spindles and spindle speeds of 20,000 revolutions/minute and more, more than 25 air changes per hour are necessary under the conditions mentioned. The existing air conditioning systems are as a result loaded to their limits. Investigations have in particular shown, for example in the dissertation "Energiesparmassnahmen in einer vollinformatisierten spinning mill!, published at the beginning of 1994 by Rolf Friedrich Bergrath at the Technical University of Zurich (Diss.ETH-No. 10657), that the control loops are only capable of following rapid changes in the air circuits to an unsatisfactory extent. This leads to uncontrollable oscillations and swings in the temperature and the relative humidity of the air in the room, which within minutes can cause a large number of thread breakages or laps on the spinning machines, so that under certain circumstances the latter even have to be switched off.
The present invention is therefore based on the object of offering a device for air-conditioning control in an air-conditioned room having textile machines, in particular ring spinning and spoolin
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Luwa AG
Tanner Harry B.
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