Abstract
Solar air collectors (SACs) are a type of solar thermal collectors that use solar radiation to actively deliver warm air into buildings. Typically deployed onto surfaces of a building with a southerly aspect, the technology has a proven record and great potential as an available and cost-effective means of space heating. This chapter presents an economic study of both unglazed transpired solar air collector (UTSAC) and back-pass solar air collector (BPSAC) systems, taking into account the internal rate of return and installation cost, based on large-scale test setups and measured performance data. Measurements of temperature, wind velocity, and solar irradiance were taken at multiple air-mass flow rates for both systems. The payback period of the UTSAC and BPSAC are found to be 3.85 and 3.12 years respectively for the case studied. While the UTSAC is shown to be around 28% more efficient, the capital investment cost for the BPSAC is around 41% lower.
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