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Calculating Energy and Demand Retrofit Savings for Stroman High School: Interim Report
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As part of the LoanSTAR program, Stroman High School in Victoria Texas underwent two retrofits: a) an absorption chiller was changed to an electric vapor compression chiller, and b) an EMCS system was installed after about 5 months in the post retrofit period. Moreover, retrofit savings calculation was complex since pre-retrofit data consisted only of monthly utility data while hourly monitored data are available for the post-retrofit period. The retrofit savings in electricity and gas were computed by two different approaches: Unnormalized Utility Bill Comparison and Weather and Schedule Normalized Utility Bill Comparison Using Post-Retrofit Daily Models. (For purpose of simplicity, in this report, we will refer them as Level-0 and Level-1, respectively.) This report describes these approaches and discusses how well the retrofit savings predicted by both approaches compare with each other. It also describes the procedure for determining demand savings.
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Liu, Y.; Reddy, T. A.; Katipamula, S.; Claridge, D. E. (1992). Calculating Energy and Demand Retrofit Savings for Stroman High School: Interim Report. Energy Systems Laboratory (http://esl.tamu.edu), Texas A&M University; Department of Mechanical Engineering, Texas A&M University. Available electronically from