Application of Three-Dimensional Distorted Tube Energy Recovery Device in Summer Air-Conditioning Fresh Air System

Under the background of "double carbon", heat pipe heat exchangers are widely used in fresh air systems to reduce the energy consumption of air conditioning systems in buildings. In this study, combined with the actual operating conditions of an air conditioning and fresh air integrated machine, a new type of high-efficiency energy recovery device based on a three-dimensional distorted tube is developed. The energy recovery effects of different parameters are calculated and simulated to determine the optimal parameters, and the indoor air distributions before and after the retrofit are simulated. During the summer season, the three-dimensional distorted tube with a pitch of 60 mm and a long axis to short axis ratio of 1.3 is used, along with a square opening for the air inlet and outlet of the energy recovery device, resulting in the highest energy recovery rate of 77.11%. Under the premise of achieving the same refrigeration effect, compared to the baseline air conditioners, remarkably, it saves nearly 35% of the power consumption. In addition, after the addition of the energy recovery device, the indoor temperature fluctuation becomes small, and the thermal comfort is improved.