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A simple automatic device for controlling levels of liquid nitrogen within two pre-set limits

✍ Scribed by H.L. Chhatwal; N. Chaudhuri

Publisher: Elsevier Science
Year: 1973
Tongue: English
Weight: 191 KB
Volume: 13
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(73)90122-7

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✦ Synopsis

word of caution may be in order. The ratio of the densities of the liquid to that of the gas is much lower for helium than for other fluids for equilibrium conditions at the same pressure. This might require that the quality term in the expression using mixture properties be modified or, if not, less reliable results be accepted for helium.

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An automatic device for controlling level of liquid nitrogen within two pre-set limits

✍ H.L. Chhatwal; N. Chaudhuri 📂 Article 📅 1972 🏛 Elsevier Science 🌐 English ⚖ 179 KB

refrigeration power. Q' is linearly proportional to temperature difference AT = T o -T, where T o is the setting temperature and T is the actual temperature. For small AT, the input of the regulator Vi q is proportional to AT. IC-1 transforms Vin to (Vin + Vo)½ due to the square characteristic of di