How Solar Direct Injection
Solar Direct Injection [SDI] can provide 80-90% of a well-insulated structure’s heat requirements depending on the winter, and 60-70% on a lesser insulated structure.
SDI is the principal of injecting solar thermal heat into your 4-6” concrete slab to store heat from a solar thermal collector array. You can store heat for your building; home or business, without need a storage tank or you can add a storage tank. This system also can additionally produce DHW or Domestic hot water for home or business consumption. See diagram. If you have a slab with appropriate tubing in it, upper or adjacent floors with gypcrete can be heated additionally.
- Requires & uses a concrete slab to store heat generated by solar thermal collectors.
- The concrete slab needs to be insulated.
- Domestic hot water can also be created by the same solar collectors (requires a DHW tank – DHW is not stored in the slab.)
- Collector angle is typically 60˚-75˚, depending on latitude.
- Wall mounting on south facing walls is most economical location though free standing is a perfect option.
- Collectors can be mounted on a close by south building wall, with heat delivered below grade to a separate structure.
- In snow country the collector array need to have freeboard above snow level to drop snow.
- Off the self-available controls allow for numerous control options.
- Digital programming.
- Automatic over heat protection & heat dump in warm seasons.
- Auto switchover to back up heat sources with either gas or electric fired boilers or heat pumps.
Here's a sample schematic of how Solar Direct Injection works: