Longterm Solar Heat Storage in an Underground Water Cistern Retrofitted with Thermal Insulation. Second Technical Progress Report

摘要

The performance of the cistern was tested by measuring storage and surrounding soil temperatures over extended periods of time as heat was added from a solar collector (summer, fall, and winter) or environmental coolness was added (via cold air blown into the cistern) in winter. From these measurements, storage time-constants of the order of 6 months were inferred and verified. (ERA citation 06:010703)