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Joint-Frequency Bins versus Conventional Bin Weather Data in Analysis of HVAC System Operation
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Often in simplified energy analysis the use of bin weather data is employed for a more time efficient and better organized analysis than using the full 8760-hour annual weather data. It has been suggested that joint-frequency bins be used instead of conventional bin data. Joint-frequency bins of dry bulb temperature and humidity ratio and conventional bin data are used in the analysis of the operation of four different HVAC systems in a prototype building using weather data from four climatic regions. In the case of 10% ventilation air, the analysis shows less than 3% difference in cooling between the use of the different bin methods. An increase of ventilation air to 40% increases the percent difference up to 10% difference in cooling requirements. From this study the use of joint-frequency bins has relative added value to the analysis of HVAC system operation depending on whether the system is dominated by ventilation loads.
Jones, A.; Baltazar, J. C.; Claridge, D. E. (2009). Joint-Frequency Bins versus Conventional Bin Weather Data in Analysis of HVAC System Operation. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from