In order to improve the temperature efficiency of the pump-driven loop heat pipe system and explore the technical feasibility of replacement of the single-loop pump-driven loop heat pipe system by the multi-loop pump-driven loop heat pipe system for energy recovery from exhaust air in public buildings

a single-loop and a triple-loop pump-driven loop heat pipe system prototype were developed.An experimental setup was built to contrast the heat transfer characteristics between the single-loop system and the triple-loop system under summer and winter working conditions based on the principle of heat transfer temperature difference uniformity.Results indicated that performance of the triple-loop system was better.Compared with the single-loop system

the temperature efficiency of the triple-loop system was improved by 22.6% under winter working condition when the temperature difference between indoor and outdoor air was 31.9℃ because the temperature difference uniformity was much better

while the temperature efficiency changed little under summer working condition.