Three-heat-reservoir thermal Brownian refrigerator and its performance limits Congzheng Qi, Lingen Chen, Yanlin Ge, Wenhao Yang and Huijun Feng Eur. Phys. J. Plus, 137 10 (2022) 1187 Published online: 27 October 2022 DOI: 10.1140/epjp/s13360-022-03415-x