ABSTRACT
A fundamental graph-and-math based methodology to develop engineering-economic models of cogeneration systems is reported here. This report has two parts. In Part 1, the CHP Demand and Supply plane is developed; Technology T and System S lines are introduced; and several design and evaluation considerations are discussed. Part 2 (forthcoming) will describe the states of nature of an interconnected CHP system and will prescribe a set of linear equations for the economic modeling of Combined-Heat-and-Power plants. As a whole, the underlying models will be instrumental to build further cogeneration system analysis, design, evaluation and optimization models and programs. Future articles will report further developments.