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Modeling On-Site Utility Systems Using "APLUS"
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Most energy saving schemes on industrial sites lead to reductions in the steam and/or power demands on an on-site utility system. Accurate knowledge of the marginal and incremental costs of the available levels of steam and shaft power from such systems is, therefore, essential for the correct economic evaluation of proposed retrofit schemes. Knowledge of marginal costs is also essential for continuous optimal operation of on-site utility systems. "APLUS" is an IBM-PC based software package developed for evaluation of marginal and incremental costs of on-site utilities. "APLUS" allows the user to configure steam/power systems using sets of predefined icons. Once a flowsheet has been configured, the program can be used to solve the heat and mass balance and to generate accurate marginal costs. An overview of the package and examples illustrating its applications are presented in this paper.
Ranade, S. M.; Jones, D. H.; Shrec, S. C. (1988). Modeling On-Site Utility Systems Using "APLUS". Energy Systems Laboratory (http://esl.eslwin.tamu.edu). Available electronically from