Comparison of Heat Recovery Ventilator Frost Control Techniques in the Canadian Arctic: Preheat and Recirculation

Air-to-air heat/energy recovery ventilators can effectively reduce the cost associated with ventilating a home. However, high indoor moisture levels, in conjunction extreme temperature differences between outdoor and air cause frost accumulation mechanical equipment, leading to performance degradation or failure. In this research, demonstration house using heat ventilation system Iqaluit, Nunavut, Canada was used compare of two control techniques: recirculation electrical preheat. The advantages disadvantages each method are outlined highlight need adapt southern strategies ensure functionality Arctic. equipped ventilator (HRV) built-in technology defrost HRV, as well electric preheaters that be instead prevent formation. Between December 2018 April 2019 system’s monitored for seven weeks while either experiments showed equipment consumed more absolute energy preheat than technique. when recirculation, experienced losses throughout system, causing whole building consume due an increase consumption by home’s heating system. Moreover, quantity restricted made superior option design. use enabled 35% lower on per volume basis. Contrary some belief preheating is poor approach ventilators, research finds efficient provide if controlled well.