A passive evaporative cooling heat sink (PECHS) enhances the TEG output capacity. The PECHS has excellent evaporative cooling capability and energy-free water transport characteristics. We established a theoretical model of the PECHS cooled TEG, and investigated the influence of the key parameters on the TEG output capacity. The key parameters include the TEG hot-side temperature (TH = 50–150 °C), ambient relative humidity (RH = 0–100%), ambient temperature (Tamb = 0–40 °C), fin height (Lf = 10–60 mm), fin thickness (tf = 1–3 mm), and fin number (M = 7–17). And this research provides a reliable reference example for the subsequent practical application of utilizing PECHS to enhance the TEG output capacity.

Portable air cleaners have the advantage that they can be placed in different parts of the building and used where air purification is required. Portable air cleaners can help reduce airborne contaminants, including particles containing viruses. The placement of the air cleaner has a huge impact on the indoor airflow patterns. Effective placement of air purifiers improves cleaning efficiency and allows for rapid particle removal, which in turn significantly affects occupant exposure to particles.

Topology optimization is considered to be a promising strategy to design conformal cooling channel in injection molding process as its high degree of geometric freedom. In this research, a complete cycle of development of conformal cooling channel designation by using thermal-load based topology optimization is constructed by using the Python. The code mainly consists of the finite element solver of Multiphysics equations, objective function modeling, sensitivity analysis and pseudo-density iterative algorithms. Meanwhile, conjugate heat transfer simulation is implemented in COMSOL Multiphysics to study the performance of optimal conformal cooling channels in injection mold comparing with traditional parallel-shaped channels. The results show that topology optimal cooling channels have relatively lower pressure drop, lower maximum temperature difference and higher cooling efficiency then parallel-shaped channels.