Accession Number : ADA130356

Title :   Thermal Energy Storage Evaluation and Life Testing.

Descriptive Note : Interim rept. May-Oct 81,


Personal Author(s) : Richter,Robert

PDF Url : ADA130356

Report Date : Jan 1983

Pagination or Media Count : 44

Abstract : Two thermal energy storage (TES) units which were built under a previous contract were tested with a Hi-Cap Vuilleumier cryogenic cooler in the facility of the Hughes Aircraft Corporation. The objective of the program was the evaluation of the behavior of the TES units as well as the determination of the temperature history of the three cold stages of the Vuilleumier cryogenic cooler during cyclic charging and discharging of the TES units. The test results have confirmed that thermal energy storage can provide the necessary thermal power to the hot cylinders of the Vuilleumier cryogenic cooler at the required operating temperatures. Thereby the continuous cooling capability of the cooler during an eclipse when no electrical power is available is being assured. The cold stage temperature amplitudes during a complete charge - discharge cycle of the TES units were only about 10% of the amplitudes which were observed when the Hi-Cap Vuilleumier cryogenic cooler was operating without thermal energy storage backup in a simulated orbit of 54 minutes sun exposure and 18 minutes eclipse time. The themal conductivity of the molten thermal energy storage salt was apparently only a fraction of the thermal conductivity which had been assumed for the prediction of the upper heater temperatures. A redesign of the heater temperatures below 1480 degrees F which is now required for full charging of the TES units within 54 minutes with the present heater design. (Author)

Descriptors :   *Thermal properties, *Energy storage, *Thermal power plants, *Life tests, *Cryogenic storage devices, Phase shift, Test methods, Thermal conductivity, Cooling, Cycles, Thermal utilization, Electric discharges

Subject Categories : Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE