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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

A Study on Prediction of Solar Insolation and Its Effects on Building Heating Loads

Get access (open in a dialog) DOI: 10.1615/IHTC15.ees.009019
pages 2289-2297

要約

For the energy saving and optimal control of HVAC systems, it is essential to predict hourly heating and cooling loads of a building. Heating and cooling loads are mainly dependent on building structure, solar insolation, outdoor temperature and humidity. In this paper, the simplified methods predicting hourly solar insolation and building heating loads are proposed, and it is investigated how the prediction error of solar insolation influences the heating loads. Clearness index equation for the prediction of solar insolation is proposed only using sky condition and relative humidity which are forecasted from the meteorological administration. The predicted insolation shows fairly good agreement with the measured data. Heating loads are generally divided into the four categories; that is, transmission, solar, infiltration and internal heat gain. Building characteristic coefficients for each loads are proposed and derived from the building design data. Benchmarking buildings are selected in order to validate the proposed method, and heating loads of the present study are compared with those simulated by EnergyPlus. The hourly and daily variations of heating loads are similar each other, and the effect of the prediction errors of the solar insolation on heating loads calculation is found to be relatively small.