December 15, 20241 yr I was going through this list: https://database.passivehouse.com/en/components/list/ventilation_small Does anyone know what the reference temp is for the heat recovery percentage ? Edited December 15, 20241 yr by sonicboom
December 15, 20241 yr It's in the certification criteria - https://database.passivehouse.com/en/components/#certification-methods-info The effective dry heat recovery efficiency [is measured with] with balanced mass flows at external temperatures of between – 15 and + 10°C and dry extract air (ca. 20 °C) Presumably the worst reading is taken. However Heat Recovery Efficiency, as the name suggests, only measures heat recovered. On that basis a unit with expensive-to-run fans can look better than one with highly efficient ones. The Efficiency Ratio is the key figure that allows you to compare units like-for-like, taking into account the electricity used as well as the heat recovered.
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