A　calculation　method　of　an　air-to-air　thermosyphon　heat　exchanger　was　reported　in　this　paper.　The　face　velocity,　number　of　rows　and　inclination　angle　of　heat　exchanger　were　tested　and　studied　in　an　air　enthalpy　type　psychrometric　calorimeter　including　indoor　and　outdoor　chambers.　The　error　of　the　calculation　method　and　experimental　data　was　within　15%.　Thus,　the　calculation　method　can　be　applied　in　engineering　design　of　the　air-to-air　thermosyphon　heat　exchanger.　©,　2014,　Chemical　Industry　Press.　All　right　reserved.