Abstract: A new concept of thermoeconomic life is put foreword in this paper,and the problem of what time to replace present energy systems so as to achieve maximal economic benefit is Studied based on the concept.The decision model suitable to unitary energy systems is presented,specifically,the idea and method of determining thermoeconomic life of compound energy systems is put foreword.The decision model of compound systems is also built,which forms the decision theory of thermoeconomic life of energy systems.Two examples of applying the theory to a unitary system and compound system show that replacing the systems at their thermoeconomic life is obviously beneficial.The theory presented in this paper can be applied generally to improving and guiding the operation and replacement of energy systems.

摘要： 提出了热经济寿命的新概念 ,基于此研究能量系统在何时更新其热经济性最佳的问题 ,并建立了单元系统的热经济寿命确定模型 ,尤其提出了复合系统确定热经济寿命的方法和决策模型 ,从而形成了能量系统热经济寿命的决策理论 .一个能量系统更新的实例 ,表明在它的热经济寿命时更新系统 ,可使系统创造更大的经济收益 .本文的工作为能量系统的设备更新提供了一种普遍适用的理论和方法 .