Accession Number : AD0920029

Title :   Split Stirling cycle Cryogenic Refrigerator.

Descriptive Note : Final technical rept. 1973-1974,

Corporate Author : AIR PRODUCTS AND CHEMICALS INC ALLENTOWN PA

Personal Author(s) : Longsworth, Ralph C.

Report Date : FEB 1974

Pagination or Media Count : 74

Abstract : The object of this program was to develop a Split-Stirling cycle cooler capable of producing .6 watts of refrigeration in a 120 F ambient with 28 Vdc input power of less than 90 watts. System weight objective is less than 3.5 pounds, separation between expander and compressor is 18 in. and the unit is to be nearly inaudible. One of the primary goals of the program was to develop a cooler that would be simple to construct and have low production cost. The approach was to develop a compressor incorporating linear motors and use this to actuate a miniature pneumatically actuated expander. The separate expander permits greater flexibility in incorporating it in an IR detector system and also permits isolation of the compressor vibration. The development of the compressor with linear motors proved to be very difficult. The program was carried to the point where enough of the problems were resolved so that a fair evaluation could be made of the future potential of this approach. Comparison of this compressor system with others under development at the contracting agency showed that it was not worth pursuing further development of this unit for this application. At this time the prototype unit demonstrated the practicality of the basic cycle and independent tests of the expander indicated it was operating well.

Descriptors :   *STIRLING CYCLE), (*REFRIGERATION SYSTEMS, (*CRYOGENICS, REFRIGERATION SYSTEMS), REGENERATIVE COOLING, THERMODYNAMICS, THERMODYNAMIC CYCLES, GAS COMPRESSORS, EXPANSION, HEAT EXCHANGERS, SYSTEMS ANALYSIS, PERFORMANCE(ENGINEERING), INTEGRATED SYSTEMS, INFRARED DETECTORS, LINEAR SYSTEMS, PISTONS, ELECTRIC MOTORS, PROTOTYPES, FEASIBILITY STUDIES, VIBRATION, QUIET, CONTROL SYSTEMS, COMPUTERIZED SIMULATION, COSTS, NIGHT VISION DEVICES.

Subject Categories : Air Condition, Heating, Lighting & Ventilating
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE