ANL/RBC: A COMPUTER CODE FOR THE ANALYSIS OF RANKINE BOTTOMING CYCLES, INCLUDING SYSTEM COST EVALUATION AND OFF-DESIGN PERFORMANCE

ABSTRACT:
ANL/RBC is a FORTRAN computer program which calculates cycle performance and the sizes and costs of system components for Rankine Bottoming Cycles. This computer program is an expanded/modified version of an earlier undocumented computer program, originally developed by J. L. Krazinski of

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ANL and used for the comparison study reported in Ref. 1. As an option the code can be used to calculate performance for a given system for "off-design" conditions, which are defined below. The basic system model consists of a user- defined Rankine cycle, which extracts heat from a source gas stream, (e.g., the exhaust stream of a prime-mover), and rejects heat to a coolant stream. The gas flow rate and gas inlet temperature are assumed to be known fixed quantities. Using input data which define the working fluid and cycle conditions (e.g., turbine inlet pressure and temperature, condensing temperature, component efficiencies, etc.) the code calculates the power output of the Rankine cycle and the sizes of the heat exchangers for the cycle. An option is provided to calculate the costs of the various system components, using cost data supplied by the user. The code allows a number of cases to be run at one time, for different conditions of turbine inlet temperature and pressure. These different turbine inlet conditions may be specified by the user for each case, or calculated automatically for a user specified mesh over ranges of pressure and temperature.

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