Study on thermodynamic system characteristics of thermoelectric units under variable operating conditionsZiwei Zhong, Lingkai Zhu, Wei Zheng, Zhiqiang Gong, Panfeng Shang, Junshan Guo, Jun Liu and Yanpeng ZhangE3S Web Conf., 375 (2023) 01003DOI: https://doi.org/10.1051/e3sconf/202337501003