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- W2605222212 abstract "Abstract Weather conditions account for a major source of deviation between simulation results and actual energy performance of buildings. Typical meteorological year (TMY) weather data are commonly used to evaluate building energy demand at design stage. However, such data might overestimate or underestimate the energy demand of buildings considerably depending on the building designs. Also, TMY does not capture the yearly weather variations which is important for evaluating the potential energy savings and penalties for specific energy efficient measures in the long run. This paper conducts a large-scale building performance simulation (3906 simulations) to explore the uncertainty in energy performance incurred in deploying the TMY file and to quantify the discrepancy in energy performance with those evaluated under 30 years of actual weather data for a variety of cool roof designs in Montreal, Canada (a cold climate). A parametric study of energy performance of the buildings with 14 roof insulation values and 9 solar reflectance values (covering both cool roofs and dark roofs) under Canadian Weather Year for Energy Calculation (CWEC) weather data and 30 actual weather data from 1960 to 1989 is conducted. The simulated results based on the 30 years actual weather data are compared to those based on the CWEC data to quantify the differences by root-mean-square deviation (RMSD) evaluation. The findings suggest that: (1) there is a deviation from 3% to 29% between the predicted energy performance under CWEC and that under actual weather data; (2) highest roof insulation level has the least overestimation in space conditioning energy demand; (3) cool roof with the least roof insulation level has the largest overestimation in space conditioning energy demand; and (4) the majority of cool roof designs estimated by CWEC tends to be overestimated which leads to more conservation designs. This paper demonstrates the importance to evaluate the long term performance of the cool roof by taking into account actual weather data. And it also quantifies the potential overestimation in energy demand and offers designers a reference at early design stage of cool roof in the cold climate" @default.
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- W2605222212 date "2017-06-01" @default.
- W2605222212 modified "2023-09-26" @default.
- W2605222212 title "Energy performance of cool roofs under the impact of actual weather data" @default.
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- W2605222212 doi "https://doi.org/10.1016/j.enbuild.2017.04.006" @default.
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