Abstract
Heat recovery ventilator and energy recovery ventilator (HRVs/ERVs) save energy load in buildings by reusing the heat from exhaust air. However, when HRVs/ERVs are operated in winter season, condensation may occur in heat exchange process causing negative influence not only on occupants but also on the performance of the system; mold and bacteria are developed through condensation causing respiratory diseases to occupants, and frosts may be developed once the condensation meets the air with the temperature under the freezing point causing the efficiency of exchangers to drop dramatically or even the breakdown of the whole system. Many methods to prevent condensation or frost have been suggested however preheating may be the simplest and the most certified method to guarantee the performance of the HRVs/ERVs systems. In this paper, variable factors for sizing the capacity of preheating coils have been verified. Also, the appropriate preheating capacity of HRVs/ERVs for different regions in Korea have been suggested based on the frost threshold temperature and the design procedure for various conditions.
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