![]() The 24-hour average value of the absolute mean bias indicates the likely magnitude of the error in any particular case. The results of the comparisons of simulated and measured performance indicate that the predictions from all three engines are not significantly different. This information is intended for practitioners who are concerned about transitioning between simulation tools with different engines and for managers of utility programs leveraging these tools for evaluating and/or projecting measure savings to be incentivized under their programs. These results provide useful information regarding the accuracy of these engines in predicting the cooling and heating load elements of whole building energy performance. Seven conventional overhead mixing ventilation scenarios were tested and each engine was found to have a similar level of agreement with the measurements of space-level heating and sensible cooling loads. These engines are commonly used in the United States for building energy code compliance, federal, state, and utility incentives programs, as well as energy efficient design of new buildings and energy retrofit of existing buildings. Detailed measurements of FLEXLAB performance, including indoor temperatures and heat fluxes and air-flow and water more » flow rates and temperatures in the Heating, Ventilating and Air Conditioning (HVAC) system, together with hourly weather data, were recorded and used in analyzing the simulation results from EnergyPlus v8.8, DOE-2.2 v3.65 and DOE-2.1e v127. The specific test conditions included some of those prescribed in ANSI/ASHRAE Standard 140 - Standard Method of Test for the Evaluation of Building Energy Analysis Computer Programs. The aim of the project reported here was to better understand the level of accuracy of three building energy simulation (BES) engines (‘engines’) - EnergyPlus™, DOE-2.1e, and DOE-2.2 - by identifying and investigating significant deviations between the performance predicted by these engines and actual performance as measured in the FLEXLAB® test facility at Lawrence Berkeley National Laboratory (LBNL). These included BLAST, DOE2, ESP, SERIRES, S3PAS, TASE, and TRNSYS. = programs selected by the participants to represent the best state-of-the-art detailed simulation capability available in the United States and Europe.
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