A Developed Method for Energy Saving Prediction of Heat-and Energy Recovery Units

In heat and energy exchangers frosting decreases the effectiveness of the exchangers. In a previous research effectiveness data were investigated experimentally considering the frosting effect [1]. Using these tested effectiveness data and ambient temperature/enthalpy duration curves annual heating energy consumption of ventilation systems were predicted in three different climate European locations. During this investigation two common frosting protection techniques were also considered: outdoor air preheating and outdoor airflow bypassing (supply side closing). The evaluation shows the outdoor air preheating technique results higher energy saved than the supply side closing. Furthermore if the indoor air quality demands are lower using a sensible heat recovery unit is satisfactory and the investment cost is lower.