Abstract
The performance of three types of heat-pipe heat recovery unit for naturally-ventilated buildings was tested in a two-zone chamber with a horizontal partition. Air velocity was found to have a significant influence on the effectiveness of heat recovery. The effectiveness decreased with increasing air velocity. The effectiveness was also affected by the shape of fins and pipe arrangement. The pressure loss characteristics of heat recovery units were determined using computational fluid dynamics (CFD). It was found that at low velocities for natural ventilation the pressure loss coefficient decreased with increasing air velocity but the total pressure loss increased with the velocity.
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