A new air cooling system by steam power cycle coupled with the positive and negative sequence refrigerating cycle (hereinafter called ‘combined cycle air cooling system’ or CCACS) was presented in order to handle the shortcoming of the actual air cooling system. The designers could make a choice between the ammonia compression refrigerating cycle (ACRC) and ammoniacal-liquor absorption refrigerating cycle (ALARC) according to the load bearing characteristic of turboset and climatic condition of unit installed sit. Moreover the components and process flow diagram of ACRC and ALARC of combined cycle air cooling system was briefly illustrated in order to facilitate type selection. The performance evaluation criteria of CCACS was established and contrastive analysis between the performance evaluation of ACRC and ALARC was done. An analog computation example show that the ALARC has many advantages, such as, all the performance evaluations, the energy consumption, energy level and so on, the ALARC is suitable to be installed in higher temperature area.

国家重点基础研究发展计划项目(973项目)(2007CB206904)；中国华能集团公司科学技术项目(HNKJ08-H32)。