Effect of glazing ratio on thermal comfort and heating/cooling energy use

Research output: Contribution to conferencePaper – Annual report year: 2019Researchpeer-review

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Some modern buildings are always designed with large glazing area. Glazing ratio (GR) or window to wall area ratio is an important factor that affects thermal loads. It also has impact on thermal environment because solar radiation through windows and warm/cold window surface temperature in different seasons. In this study, GR of 30% and 100% were compared to see their impact on thermal environment and energy use. The study was performed based on a simple office model equipped with fan-coil system located in Paris. Air temperature based thermostat control and operative temperature based thermostat control were compared for both GR conditions. IDA ICE simulation tool (version 4.8) was used to simulate the operation of a whole year. As expected, with 100% GR, the offices used more heating and cooling energy. Total heating energy increased about 140% to 150% and cooling energy increase 55% to 60%. Compared to 30% GR, thermal comfort became worse. During working hours, the air temperature change became higher with 100% GR. Statistics showed that there were less occupancy hours within ±0.7 (PMV) when 100% GR was used. Thermal conditions of north office were better than south office. In south office, the unsatisfied hours (PMV is higher than 0.7 or lower than -0.7) for south office was close to 10% when GR was 100%. For north office it was about 3%. The results also showed that with operative temperature control thermal comfort can be better for both north and south office in that there were more occupancy hours within in the range of -0.5 and 0.5 (PMV). The energy use with operative temperature control increased about 3% for heating and 6% for cooling compared to air temperature control. Based on the results, operative temperature control would be better to keep comfortable thermal environment for offices with high GR.
Original languageEnglish
Publication date2019
Number of pages8
Publication statusPublished - 2019
Event11th International Symposium on Heating, Ventilation and Air Conditioning - Harbin Institute of Technology, Harbin, China
Duration: 12 Jul 201915 Jul 2019
Conference number: 11


Conference11th International Symposium on Heating, Ventilation and Air Conditioning
LocationHarbin Institute of Technology

    Research areas

  • Glazing ratio, Thermal comfort, Energy use, Fan-coil system, Energy simulation

ID: 189829916