What you should look for in the heating season:
Is the temperature of the solar-heated air (red curve) higher than the temperature of the outside air (blue curve)? This temperature rise and the quantity of air drawn into the building determine the amount of free, solar energy (Btu) delivered by the system.

Is the fan running?
The gray curve tells you – high inlet air velocity means the fan is on. Controls for this installation turn on the fan only when temperature conditions are met. With no ventilation air requirement in this large, low-occupancy, clean-manufacturing building, InSpire is used only as a heating system. Consider the added benefit when a continuous supply of fresh air is needed to meet building code requirements!

Is the room temperature (magenta curve) increasing?
In this installation, the change is slow. The building volume is very large, and the fans are sized to mix in one volume change every two hours. This is an important consideration when sizing a system.

What is the overall benefit?
The InSpire Solar Air Heating System has been adopted as the primary heat source for this building, thus eliminating our heating cost entirely. For high-occupancy buildings with demand for consistent temperatures, InSpire can be used to supplement existing heating systems, and greatly offset your heating cost.

How does the InSpire® Wall system help during the cooling season? Read More