Link to document:
Status
Electronic Resource
Call number
Publication
DOE ET 20422 1_; Report; April 1979.
Language
Library's review
ABSTRACT:
Thermal energy storage concepts using hydrocarbon oils are being considered by the Department of Energy in first generation solar thermal power feasibility studies and plant development efforts. Martin Marietta Aerospace, Denver Division, investigated the thermal degradation
Thermal energy storage concepts using hydrocarbon oils are being considered by the Department of Energy in first generation solar thermal power feasibility studies and plant development efforts. Martin Marietta Aerospace, Denver Division, investigated the thermal degradation
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characteristics of Exxon's Caloria HT-43 oil under this program. The program has been accomplished under two phases of effort. Phase I has studied the thermophysical effects of oil degradation in a partially vented storage tank at 316 degrees C (600 degrees F) for a period of 1000 hours. Phase II has examined the effect of a sidestream processor (vacuum distillation column) on oil degradation in a vented storage tank. Test results indicate that the thermal degradation process is autocatalytic. Therefore, both tank venting and oil reprocessing can actually reduce the degradation rate. The experimentally determined degradation rates under the two phases of effort were in Phase I-2.4 percent by weight per week and in Phase II-0.1 percent by weight per week. However, computed fluid replenishment rates were in Phase I and II, 1.1 and 0.8 percent respectively. Improved processor designs could substantially lower the 0.8 percent per week observed for the Phase II sidestrearn processor. Show Less