中文摘要：

针对热电冷联产系统的特殊性，利用等效焓降理论和吸收式制冷机的性能方程，通过理论分析和数学推导，建立一套全面热电冷联产系统的经济性定量计算数学模型。通过引入“广义供热”抽汽概念，将抽汽直接连接用于制冷的热电冷联产系统的热力系统内扰动的经济性诊断方法同凝汽机组、供热机组的经济性诊断方法统一。给出单效吸收式制冷机局部定量分析近似讨算方法，解决了工程上吸收式制冷机局部定量分析计算时的简化计算问题，提出的近似计算方法在精度和计算量方面均具有一定的优势，既解决了吸收式制冷机变工况计算问题，又满足实际机组经济性诊断的需要，实例计算证明了理论模型和诊断方法的准确、简捷性。

英文摘要：

According to the specific characteristic of the heating cooling power cogeneration （trigeneration） plant, a fairly complete thermo-economic diagnostic mathematical model of heating cooling power cogeneration plant was established based on equivalent enthalpy drop theory and absorption chiller performance equation, an idea of extending the thermo-economic diagnostic to heating cooling power cogeneration plant was provided. When extracted steam links to absorption chiller directly, the economy diagnostic mathematical model of thermal system for this kind of trigeneration was unified into condensing unit and cogeneration unit by introducing the concept of ＂generalized heating＂. With the use of absorption chiller performance model, an approximate calculation method was derived for the absorption chiller unit with a quantitative analysis of the effect of operating parameters on the absorption chiller performance. The formula is simple, physically clear and accurate enough. Its correctness was verified by calculation examples and model predictions were compared against performance data from experiments with favorable results.