Development of new methodologies for evaluating the energy performance of new commercial buildings

摘要

The concept of Measurement and Verification (M&V) of a new building continues to becomemore important because efficient design alone is often not sufficient to deliver an efficient building.Simulation models that are calibrated to measured data can be used to evaluate the energy performance ofnew buildings if they are compared to energy baselines such as similar buildings, energy codes, and designstandards. Unfortunately, there is a lack of detailed M&V methods and analysis methods to measureenergy savings from new buildings that would have hypothetical energy baselines. Therefore, this studydeveloped and demonstrated several new methodologies for evaluating the energy performance of newcommercial buildings using a case-study building in Austin, Texas.First, three new M&V methods were developed to enhance the previous generic M&Vframework for new buildings, including: 1) The development of a method to synthesize weathernormalizedcooling energy use from a correlation of Motor Control Center (MCC) electricity use whenchilled water use is unavailable, 2) The development of an improved method to analyze measured solartransmittance against incidence angle for sample glazing using different solar sensor types, includingEppley PSP and Li-Cor sensors, and 3) The development of an improved method to analyze chillerefficiency and operation at part-load conditions.Second, three new calibration methods were developed and analyzed, including: 1) A newpercentile analysis added to the previous signature method for use with a DOE-2 calibration, 2) A new analysis to account for undocumented exhaust air in DOE-2 calibration, and 3) An analysis of the impactof synthesized direct normal solar radiation using the Erbs correlation on DOE-2 simulation.Third, an analysis of the actual energy savings compared to three different energy baselines wasperformed, including: 1) Energy Use Index (EUI) comparisons with sub-metered data, 2) Newcomparisons against Standards 90.1-1989 and 90.1-2001, and 3) A new evaluation of the performance ofselected Energy Conservation Design Measures (ECDMs).Finally, potential energy savings were also simulated from selected improvements, including:minimum supply air flow, undocumented exhaust air, and daylighting.