| The facing correction rates prescribed in "Heating ventilation and air conditioningdesign standard" are for national scope and the value range for each direction is bigger.However, the difference of sun radiation intensity is very big for different heating areas,the difference between the design results and the actual load may be not consistent byuse of the unified correction range. The related calculation of heat consumptionprescribed in "Civil building energy saving design standards" without taking thedifferences in orientations into account. Therefore, it is necessary to calculate the facingcorrection rates of load and energy saving combined with the distribution of solarenergy resources to improve the accuracy of the design calculation.Based on the solar heat energy levels of regional division and thermotechnicaldesign division standard, the typical cities and palisade structure were selected and theheat retaining theory of palisade structure was analyzed, the heat transfer controlequations of the roof and wall were obtained in this paper. The typical day weather datafor calculating the building facing correction rates of load and energy saving wereobtained by consulting the special meteorological data sets material for the Chinesebuilding thermal environment analysis. The heat consumption of palisade structurecaused by the difference between the comprehensive temperature and outdoor airtemperature was calculated by COMSOL Multiphysics software. The building facingcorrection rates of load and energy saving for the selected typical cities were obtained,and the regional and toward differences of the results were analyzed also. By comparingthe calculated building facing correction rate and the specification regulated data, theresults show: the calculated value are smaller for east, south and west, therefore, the total load is larger according to the specification regulated data. As for the north, thecalculated revised value is larger than the standard value, this is because the normswithout taking the sun radiation into account for north. The fact is that there are sunscattering radiation and ground longwave radiation for north, and so on. Because theoutdoor average temperature of heating season is selected as calculating temperature forthe calculation of the facing correction rates of energy saving, making the differencebetween the indoor and outdoor temperature smaller. Therefore, the building facingcorrection rates of energy saving are larger than that of load in the same area, especiallyfor the horizontal plane.By numerical calculation, the study not only gives the orientation correction factorto the heating load and energy-saving of the external walls and roof, but also provides amethod to calculate the orientation correction factor, which is useful to the actualheating design. |
