Solar Thermal System Performance
The U.S. DOE provided supplemental funding to this project to purchase a new style, indirect, drain-back solar thermal system from Wagner & Co (Secusol). This type of drain-back solar thermal system eliminates extra components and installation labor needed for a closed loop, pressurized, glycol system. Can a solar drain-back thermal system, proven to work in warmer climates, be designed to function properly in the colder northern climate and compete with the conventional solar thermal system?
Solar System Descriptions
Rheem SolPak - Conventional Glycol HX
Wagner SECUSOL - Glycol Drain-Back (Two Tank System)
Comparing Solar System Performance
The expected annual Solar Fraction (SF) from SRCC for Syracuse, NY is 0.56. The Rheem solar system is widely used throughout New York State and achieved an SF of 0.47. The Wagner drain back-solar system performed without any cold weather related issues or breakdowns and achieved an SF of 0.46, virtually the same as the Rheem system.
These plots show the typical performance of both solar systems on a clear, sunny, spring day.