Electrolytic hydrogen production and energy conversion performance based on non-imaging solar system constructed with congruent concentrating surface

Conventional solar Compound Parabolic Concentrator (CPC) has the problem of uneven distribution of the density of solar radiation energy flow reaching the surface of the absorber, which affects the stable energy output and conversion efficiency of the concentrator system. For this purpose, this paper constructed a congruent concentrating surface Optimized Multi-Section -CPC (OM-CPC) with greatly improved energy flow density uniformity, and coupled it with photovoltaic modules and Proton Exchange Membrane (PEM) water electrolyzer to carry out the energy co-generation conversion performance study. The energy conversion performance of the Concentrating Photovoltaic/thermal (CPV/T) -Battery-PEM electrolyzer system is analyzed and validated using a combination of model construction, experimental testing and numerical solution. The results show that the theoretical and experimental average hydrogen production rates of the integrated system are 70.2 ml/min and 69.5 ml/min, respectively, the theoretical maximum hydrogen production efficiency is 55.41 %, the experimental maximum is 54.59 %, and the theoretical and experimental conversion efficiency of the integrated system solar radiation-H2 can reach 7.53 % and 7.46 % respectively. This suggests that the CPV/T-Battery-PEM electrolyzer integrated system shows potential engineering applications in renewable energy electrolysis of water to green hydrogen and energy co-generation and storage.