This paper proposes a novel PEMFC-based combined cooling, heating and power (CCHP) system with independent control of refrigeration and dehumidification, which is used in data centers with strict requirements on temperature and humidity. The effects of operating parameters of PEMFC (current density, hydrogen and oxygen pressure) and refrigeration system (hot water distribution ratio, mass flow of cooling water and chilled water) on the 4E (energy, exergy, economy and environment) are investigated. Meanwhile, multiobjective optimization of the above parameters is carried out. The results show that a high inlet pressure is beneficial to improve system efficiency and reduce annual greenhouse gas (GHG) emissions. An increase in the chilled water mass flow increases system efficiency and reduces annual GHG emissions, while an increase in the cooling water mass flow yields the opposite results. Moreover, an increase in the proportion of hot water entering the adsorption chiller causes system efficiency and the annual GHG reduction to initially decrease and then increase. Compared with the unoptimized system, the energy efficiency, exergy efficiency, system cost, GHG emission reduction, electric power, cooling power, heating power and dehumidification rate of the system increase by 5.5%, 0.77%, 10%, 21.27%, 12.87%, 5.37%, 45.73% and 1.53%, respectively.

本文提出了一种新型的基于 PEMFC 的冷热电联供 (CCHP) 系统，该系统具有独立控制的制冷和除湿功能，用于对温度和湿度有严格要求的数据中心。研究了 PEMFC 的运行参数（电流密度、氢氧压力）和制冷系统（热水分配比、冷却水和冷冻水的质量流量）对 4E（能量、火用、经济和环境）的影响。同时，对上述参数进行多目标优化。结果表明，高入口压力有利于提高系统效率和减少年度温室气体 (GHG) 排放。冷冻水质量流量的增加可提高系统效率并减少年度温室气体排放，而增加冷却水质量流量会产生相反的结果。此外，进入吸附式冷水机组的热水比例增加，导致系统效率和年温室气体减排量先减后增。与未优化系统相比，系统的能效、火用效率、系统成本、温室气体减排、电力、制冷功率、加热功率和除湿率分别提高5.5%、0.77%、10%、21.27%、12.87% 、5.37%、45.73% 和 1.53%。