  In the present work we elaborate the innovative design of the solar air
heater and justify it by a Computational Fluid Dynamics (CFD) simulation,
implementing and experimentally testing a sample. We propose to use this device
for maintenance of constant ambient conditions for thermal comfort and low
energy consumption for indoor environments, inside greenhouses, passive houses,
and to protect buildings against temperature fluctuations. We tested the
functionality of our sample of the solar air heater for 50 weeks and obtained
an agreement between the results of the numerical simulation, implemented using
OpenFOAM (an open source numerical CFD software) and the experimental results.
