To address issues such as uneven airflow distribution, reduced dust collection efficiency, and different filter bag lifespans in multi-chamber bag filters, computational fluid dynamics (CFD) simulations were employed to analyze the internal flow field and propose optimization strategies. The results revealed that, although there were differences in velocity and pressure fields across the chambers, the overall distribution patterns showed certain similarities. In the original filter model, disordered airflow from the high-velocity inlet led to significant discrepancies in airflow distribution, especially along the chamber sidewalls, top corners, and central regions, resulting in considerable variation in the airflow handled by individual filter bags. Furthermore, high velocities at the bottom of the filter bags caused severe wear, complicating bag detection and replacement. Therefore, an optimization approach involving three vertical descending deflectors in the hopper was proposed. Five optimization schemes were developed to improve airflow organization before it reached the filtration area. To validate the feasibility of the proposed design and the accuracy of the numerical model, experiments were conducted using a 1:10 scaled-down model. According to the simulation results, the optimal scheme reduced the inlet and outlet pressure drop by 11.2%, while improving airflow uniformity by 40–50%, leading to a more balanced airflow distribution and increased operational efficiency.

The solar-assisted electric boiler water heating systems adopted in student apartments at universities have some shortcomings, such as unsuitable system designs, unstable water supply temperature, and excessive power consumption. As discussed in this paper, the hot water supply system was reformed, and two apartments with the same building area, same solar collector area, and similar water consumption were selected to be used in comparative experiments. The auxiliary heat source for one of the apartments was changed from an electric boiler to three air source heat pumps, and a constant temperature water tank was added to form a double-tank water supply system. In addition, the operation strategy was adjusted. The other apartment was not modified. The energy consumption, solar fraction, water supply quality and economy of the two systems were analyzed and compared. The results showed that the transformation plan is reasonable and feasible. The solar fraction of the reformed system was significantly improved. The water supply temperature of the original system ranged from 35 °C to 60 °C, but it was shown to stabilize between 40 °C and 50 °C after the transformation. The average power saving rate of the reformed system reached 72.70%, and this economic benefit is highly significant. Additionally, the TRNSYS simulation software was used to model and optimize the control of the system.