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Solar Air Heating Efficiency Versus Temperature Rise

When designing any solar air heating system, one must be aware that as solar collector efficiency increases, actual temperature rise of the heated air decreases. This is due to a basic law of physics - more heat is lost as the temperature differential increases. With this in mind, what should a designer consider when designing a SolarWall® heating system?

The first consideration is the purpose of the heated air; is it for space heating or pre-heating large amounts of ventilation air or for a process application? Space heating generally requires air to feel warm and be heated to a higher level, in the 40+°C (105+°F) range whereas ventilation or fresh air only has to be heated to room temperature typically 21°C (70°F).

SolarWall single stage system efficiency & temp charts (high air flows & low temp rise)

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