Closed Loop Antifreeze Solar Water Heating System

Closed loop active antifreeze systems are the most versatile and failsafe of all the solar supplemental water heating systems.

Closed loop antifreeze solar water heating system.

Installation basics for sdhw systems in hp94 covered aspects of installation common to most solar water heating installations such as collector location and mounting pipe runs soldering and insulation and the control system. Hydronic heating systems must be filled with water to provide the heat transfer fluid htf that makes them work. Lots on installation detail. The down side is two heat sources.

Scaling may also cause valve and pump failures on the potable water loop. Glycol or some equivalent antifreeze fluid fills. A special water heater tank incorporating a heat exchanger works in conjunction with one or more flat plate roof mounted collectors. Closed loop solar water heaters have few limitations with collector placement the collector loop is antifreeze filled and are permanently charged.

Propylene glycol and the new bio green are common antifreeze materials we have several options for exchanging the heat to the clean domestic hot water. Installation basics for solar domestic water heating systems chuck marken and ken olsen. Of closed loop anti freeze sdhw systems hereinafter referred to as closed loop sys tems. Covers closed loop antifreeze systems and drainback systems.

In the case of the closed loop solar heating system the htf is typically a mixture of water and propylene glycol. If freeze protection is an issue than a closed system with anti freeze is a good idea. Heat exchangers in the storage tank eliminate a pump but make eventual tank replacement more. 42 home power 95 sdhw.

All water heaters waste heat energy even when the burner is off and the unit is sitting idle between heating cycles. Most new solar homes feature a variation of one kind or another. Closed systems are often used in second homes or primary residences in areas prone to long power outages. Very good articles on selecting the components for a closed loop solar hot water heating system suitable for cold climates.