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Reducing Building Energy Costs Using Optimized Operation Strategies for Constant Volume Air Handling Systems
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Building energy consumption can be substantially reduced after implementing what we call Extended O&M Measures. The Extended O&M Measures are a scientific refinement of traditional O&M measures. Specifically, they involve resetting the cooling deck or heating deck temperature according to the ambient temperature such that maximum energy efficiency can be achieved without compromising indoor air quality and comfort. Extended O&M Measures optimize system performance as a whole rather than focusing on the malfunction of individual component. Our study involving five medical and institutional buildings at the University of Texas Medical Branch (UTMB). Galveston shows that Extended O&M Measures can reduce chilled water and condensate costs by $517,800/yr or 19% of the total building energy cost ($2.7 million dollars). This potential percentage savings is comparable to the LoanSTAR measured thermal energy savings in 10 buildings at another University of Texas campus where constant air volume systems have been converted to variable volume systems. Though in the later case fan electricity consumption is also reduced but with some investment cost. On the other hand, Extended O&M Measures do not require any retrofit or investment cost. Extended O&M Measures have been implemented in one of the five buildings, and the measured savings are consistent with predicted savings. It seems that the Extended O&M Measures are an excellent alternative to converting constant volume systems to variable volume systems, especially if there are no retrofit funds available.
Liu, M.; Athar, A.; Reddy, A.; Claridge, D. E.; Haberl, J. S.; White, E. (1994). Reducing Building Energy Costs Using Optimized Operation Strategies for Constant Volume Air Handling Systems. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from