Abstract
1Energy/Exergy analysis of an AHU equipped with heat recovery unit.2Effects of examine PCM through applying the solar collectors.3Integrating solar system with AHU+HRU led to energy-saving by 1832 kWh.
Taking into account a share of 42.4% of total energy usage for buildings, utilizing of energy reduction techniques in this sector will be effective. In this article, transient energetic analysis along with the exergetic study of an air handling unit (AHU) equipped with a heat recovery unit (HRU) were examined. The transient analysis was performed in July by developing a program based on the energy/exergy balance equations. The results showed that owing to using the phase change material (PCM), heat exchange diminished by 545 kWhJuly (8.6% reduction). Owing to using of a heat recovery unit, the cooling load energy demand lowered by 4043 kWhJuly (10% reduction). Although the irreversibility through the cooling experienced a 20% reduction due to the addition of an HRU, but the total irreversibility decreased by only 0.4%. Integrating the solar system with AHU + HRU led to energy-saving by 1832 kWh (11.6% reduction). Moreover, the total irreversibility reduced by 9% due to using the solar system. Finally, it was found that the solar system accounts for 83.62% of the total irreversibility.