CCHP系统能提高能源利用率，满足用户冷热电负荷需求，是解决能源与环境问题的重要技术途径。本文提出一种基于双效吸收式冷热水机的CCHP系统，通过双效吸收式冷热水机即可同时满足用户的冷热负荷需求，结构简单，能减少投资与安装面积。文章以能源利用率和单位?成本最优建立了目标函数，通过MATLAB调用Aspen Plus中的模型进行多目标优化。结果表明：CCHP制热工况的能源利用率为119%，?效率为56.4%，单位?成本为0.562元/kWh；CCHP制冷工况的能源利用率为88.6%，?效率为49.7%，单位?成本为0.639元/kWh。

CCHP system can improve energy efficiency and meet the needs of consumers' cooling, heating and power load. It’s an important way to solve the energy and environment problem. In this paper, a CCHP system based on double-effect absorption chillers and water heaters is proposed. The double-effect absorption chillers and water heaters can meet the cooling and heating load requirements of consumers at the same time. The structure is simple and can reduce investment and installation area. In this paper, the objective function is established based on energy efficiency and cost optimization, and the model in Aspen Plus is called by MATLAB for multi-objective optimization. The results show that the energy utilization rate of CCHP heating condition is 119%, exergy efficiency is 56.4%, and unit exergy cost is 0.562yuan / kWh. The energy utilization rate of the CCHP refrigeration condition is 88.6%, the exergy efficiency is 49.7%, and the unit exergy cost is 0.639yuan/kWh.