Accession Number : ADA185258

Title :   Development of a Low Noise 10 K J-T Refrigeration System.

Descriptive Note : Technical progress rept. 15 Aug 86-15 Feb 87,

Corporate Author : MMR TECHNOLOGIES INC MOUNTAIN VIEW CA

Personal Author(s) : Little, William A

PDF Url : ADA185258

Report Date : 15 Feb 1987

Pagination or Media Count : 9

Abstract : This report summarizes work on the development of a low noise Joule-Thomson, microminiature refrigeration system, designed for 10 K operation. Two events have occurred since the last report which have had an important influence on the confirmation through a series of experimental measurements of the remarkable cooling power at 80 K to 90 K of the nitrogen-hydrocarbon gas mixtures discussed briefly in the previous report. These experiments confirmed that these mixtures could give a refrigeration an order of magnitude greater than that attainable with argon or nitrogen at the same input pressures. In addition, it was recognized that this high efficiency allowed one to use a heat exchanger of substantially smaller surface area and a compressor designed for operation at much lower pressures. This lower pressure operation would greatly reduce the wear of the piston seals and thereby prolong the life of the system. It was also discovered in the course of these measurements that the use of the gas mixtures resulted in virtually clog-free operation of the refrigerators.

Descriptors :   *REFRIGERATION SYSTEMS, MICROMINIATURIZATION, ALUMINUM OXIDES, MODELS, PHASE DIAGRAMS, LOW TEMPERATURE, SUPERCONDUCTIVITY, HEAT EXCHANGERS, ENTHALPY, ENTROPY, CARBON DIOXIDE, NITROGEN, HYDROCARBONS, TETRAFLUOROETHYLENE RESINS, BROMIDES, FIRE RESISTANT MATERIALS, REFRIGERANTS, REFRIGERANT COMPRESSORS, LOW PRESSURE, SCRUBBERS, LOW NOISE

Subject Categories : Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE