732 Cogenmaster

Limaye and Balakrishnan (1989) of Synergic Resources Corporation have developed COGENMASTER. It is a computer program to model the technical aspects of alternative cogeneration systems and options, evalu ate economic feasibility, and prepare detailed cash flow statements.

COGENMASTER compares the CHP alternatives to a base case system where electricity is purchased from the utility and thermal energy is generated at the site. They extend the concept of an option by referring not only to different technologies and operating strategies but also to different ownership structures and financing arrangements. The program has two main sections: a Technology and a Financial Section. The technology Section includes 5 modules:

• Technology Database Module

• Sizing Module

• Operating Module

The Financial Section includes 3 modules:

• Financing Module

• Cash Flow Module

• Pricing Module

In COGENMASTER, facility electric and thermal loads may be entered in one of three ways, depending on the available data and the detail required for project evaluation:

— A constant average load for every hour of the year.

— Hourly data for three typical days of the year

— Hourly data for three typical days of each month

Thermal loads may be in the form of hot water or steam; but system outlet conditions must be specified by the user. The sizing and operating modules permit a variety of alternatives and combinations to be considered. The system may be sized for the base or peak, summer or winter, and electric or thermal load. There is also an option for the user to define the size the system in kilowatts. Once the system size is defined, several operation modes may be selected. The system may be operated in the electric following, thermal following or constantly running modes of operation. Thus, N sizing options and M operations modes define a total of NxM cogeneration alternatives, from which the "best" alternative must be selected. The economic analysis is based on simple payback estimates for the CHP candidates versus a base case or do-nothing scenario. Next, depending on the financing options available, different cash flows may be defined and further economic analysis-based on the Net Present Value of the alternatives—may be performed.

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