Abstract
Energy has become the backbone of humanities daily activities. Heating, ventilating, and air conditioning systems (HVAC), which consume around 39% of energy in the residential sector, have turned into an essential constituent for providing fresh air, especially after COVD-19, not only in hospitals but also in any simple construction. Thus, decreasing this percentage or recovering part of the energy lost is an essential issue in today’s energy management scenarios. In this context, the present manuscript suggests a comprehensive review, classifications, critical analysis, and potential recommendations for energy recovery in air conditioning systems. It classifies energy recovery into two main categories: using lost energy for external uses, such as heating domestic water, or with other devices; and using lost energy for internal uses, such as the hot airflow which can be reused again for increasing efficiency of HVAC. In addition, this paper presents a summary of previous research and undertakes a review of the devices used for recovering energy. Furthermore, this review identifies superior devices in terms of climate and weather conditions. These objectives are accomplished by investigating around 190 published papers to conclude that energy recovery devices show a considerable effect on energy consumption in HVAC, mainly the heat pipe, fixed plate, and rotary wheel devices.
Highlights
Energy has always been an essential requirement for the existence of all living organisms, as it is essential for growth, movement, maintenance, and creating work
The results showed that a total amount of 2885 kWh can be saved yearly; this amount can be raised to 7023 kWh per year if eight-rows HPHX was used
The volumetric flow rate is increased, and a higher amount of energy recovery is expected as the face velocity is increased, but this results in a higher-pressure drop in the coil, which decreases the effectiveness
Summary
Energy has always been an essential requirement for the existence of all living organisms, as it is essential for growth, movement, maintenance, and creating work. Agency (IEA) predicted that by 2050, global energy consumption will increase by 50% [3,4], and buildings will account for the largest source of emissions due to the rapid growth in industries. The reduction of energy loss leads to developing a new strategy that arranges the use of energy, and, most importantly, ensures that power, which would otherwise have been lost, is made use of and provides benefits [7]. This strategy is called recovering lost energy [8]
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