Abstract
Heat pipe heat exchangers (HPHE) are highly efficient heat exchangers employed in heat recovery systems. They are suitably applied for energy recovery in HVAC systems especially in tropical countries where incoming fresh air at high ambient temperatures could be precooled by the cold exhaust air streams. They are also finding an increasing application in boiler flue-gas heat recovery systems for preheating incoming combustion air. HPHEs may also be employed for heat recovery from the hot exhaust air in timber drying kilns. This paper describes work on the hysteresis effect during start up and cooling down of thermosyphon elements in an HPHE, using R-22, R-134a and water as working fluids.
Published Version
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