14 June 2002
b. Standard Solar Energy System. Although fundamental principles for many
types of systems have been discussed, the type of system best suited for water heating
will use flat-plate, liquid-based collectors, water storage, and a propylene glycol/water
solution as the heat transfer fluid. Control systems should use simple differential
temperature control with built-in diagnostics. This type of system will be the most
reliable and effective in meeting the Services' needs and design/construction practices.