Configuration optimization of a membrane-based total heat exchanger with cross-corrugated triangular ducts considering thermal economy and entropy generation

Membrane-based total heat exchanger with cross-corrugated triangular ducts is a new structure, and the changing-section channels in the heat exchanger would make fluid undergo periodic contraction and expansion, which provides an effective approach for strengthening convective heat and mass transfer. Numerous studies proved that the geometric structure have great influence on performance of this type of heat exchanger core, whereas studies about structure optimization considering both thermal irreversibility and economic benefits are rare. In the present study, the total economic return and total entropy generation rate are analyzed as two objective functions simultaneously to evaluate thermal economic and thermal irreversibility performance respectively. A global sensitivity analysis was conducted to select the more sensitive paraments from the six key geometric design parameters: the channel height H, apex angle theta, channel number of each layer on fresh air side n(f), channel number of each layer on exhaust air side n(e), and the total number of plates n(h). They are optimized by the multi-objective particle swarm optimization (MOPSO) algorithm by taking into account entropy generation minimization (EGM) and economic return maximization. The convergence and stability analysis of the algorithm is proposed and the result informs a good application. The optimal geometric design scheme is obtained from the Pareto set according to the normalization method. A parameters analysis was also conducted to study the influence of geometric parameters on the thermal irreversibility and thermal economy performance of the heat exchanger.

Automated summary

This study investigates a new structure of membrane-based total heat exchanger with cross-corrugated triangular ducts to enhance convective heat transfer. The research focuses on optimizing the geometric design parameters while considering thermal irreversibility and economic benefits. Multiple objective functions are used to evaluate the performance of the heat exchanger, and a global sensitivity analysis is conducted to select the most influential parameters for optimization.