The selection criteria of working fluids for solar thermal organic Rankine cycle and the features of R245fa as a working fluid are analyzed. A thermodynamic analysis of photovoltaic / thermal organic Rankine cycle system and the influence of evaporation temperature of working fluid in the evaporator coupled with solar panels are conducted. The results show that the performance of the solar photovoltaic/thermal organic Rankine cycle can be improved by optimizing the evaporation temperature, and 130°C is an appropriate evaporation temperature.

A solar thermal organic Rankine cycle (ORC) power generation system model established using R245fa as the working fluid and coupled with a solar photovoltaic generator is introduced. Thermal efficiency and exergy efficiency of the model both with and without a heat regenerator are calculated and compared. Results show the solar organic Rankine cycle system with a heat regenerator has higher thermal and exergy efficiency than the system without a heat regenerator, providing better performance in practice. This result provides a basis for further application and improvement of solar photovoltaic and the solar thermal organic Rankine cycle.

A new species of softshell turtle (Pelodiscus jiangxiensis sp. nov.) is described based on five specimens from Jiangxi, China. Phylogenetic analysis of mitochondrial sequences indicated that the new species is the sister lineage to a Pelodiscus clade that includes two currently recognized species, namely P. axenaria (Zhou, Zhang & Fang, 1991) from Hunan and P. huangshanensis Gong et al. 2021 from Anhui. Morphologically, the new species is most similar to P. axenaria but can be distinguished by its plain, yellowish white plastron, the absence of the single dark gray central figure, and a distinct carapace pattern. The description of this species increases the number of recognized Pelodiscus species to seven, of which six are distributed in China and four are endemic.