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Temperature control for a long distance cooling channel using a microcomputer

โœ Scribed by N. Tamada; S. Tomiyama; T. Sekine

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
614 KB
Volume
21
Category
Article
ISSN
0011-2275

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โœฆ Synopsis

Conventional control systems developed so far for long distance cooling channels, are not yet capable of local-temperature control, local-pressure control or sequential control, since thermodynamic properties of supercritical hefium show an order of magnitude change and strong nonlinearity for applied pressure and temperature of cables and magnets.

In this paper, a new temperature control method for long distance cooling channels using a microcomputer is proposed. This method is controllable without the necessity to consider the thermodynamic properties of supercritical helium, because a type of learning control method is adopted.

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Testing was carried out with different specimens and the following observations were made. The specimen reached liquid nitrogen temperature in three minutes. No frosting occured on the surface of the aluminium containers nor on the tensiometer grips. This is because the pressurized nitrogen gas pr