✦ LIBER ✦

Surface efficiency of various types of heat exchangers in an He3He4 dilution refrigerator

✍ Scribed by F.A. Staas; K. Weiss; A.P. Severijns

Publisher: Elsevier Science
Year: 1974
Tongue: English
Weight: 906 KB
Volume: 14
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(74)90225-2

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✦ Synopsis

Using the continuous counterflow heat exchanger as a standard of comparison, the surface efficiencies of the parallel flow heat exchanger and a discrete heat exchanger element are defined and computed. The results are generalized to chains of heat exchanging elements and a method for optimizing the efficiency of such a chain is discussed. The importance and means of avoiding several deleterious effects such as gravitational instabilities, intrinsic heat conductivities, and viscosity are discussed.

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On the choice of tube lengths and diamet

On the choice of tube lengths and diameters in a He3He4 dilution refrigeration system

✍ W. van Haeringen 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 463 KB

A discussion is presented on the problem of choosing the lengths and the diameters of the various tubes in a He 3-He a dilution refrigeration system, which are directly connected to the mixing chamber(s). The treatment is based on recently obtained explicit solutions of the differential equations de