This paper investigates the energy performance of a double-skin solar facade component with BIPV for winter weather (Building Integrated Photovoltaics). It concentrates on isolating the pre-heat contribution from the facade in a January week, and on evaluating the thermal contribution from the BIPV. Further, the electrical contribution from the BIPV is compared with the electrical load required for a fan to move the air from the air-handling unit into the offices. The critical winter week performance was tested using the ESP-r. The results have shown a potential for reducing the energy needed to heat offices during office hours corresponding to the daylit period. It was also found that the addition of the BIPV reduced solar heat gain; but that the thermal contribution from the PV cells partially offset this loss. In addition, the PV was found to provide 75% of the electrical load for fans in the January week.
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