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A platform for research: civil engineering, architecture and urbanism
Optimum window-opening control for naturally ventilated buildings with phase change materials in the hot and humid climate of Indonesia
https://orcid.org/0000-0001-7505-0916
Abstract This study aims to determine the optimum window-opening control that maximizes annual thermal comfort using ventilative cooling, i.e., night and comfort ventilation, in naturally ventilated buildings where phase change materials (PCMs) are used. A thermal energy simulation (TES) coupled with an airflow network model was constructed to evaluate the comfort ventilation and thermal storage effects of the PCMs by controlling the window-opening patterns. The EnergyPlus-based coupled TES model was validated by comparing with the field measurement results of a full-scale experimental building in Indonesia. The root-mean-square errors of the temperature and air speeds at the center of the target building ranged from 0.2 to 0.5 °C and 0.1–0.2 m/s, respectively. The accuracy of the coupled TES was similar to that of computational fluid dynamics coupled with the heat balance analysis, which can simulate the spatial distributions of temperature and air speeds. The annual simulation results showed that prioritizing the thermal storage effect of the PCMs in the morning and comfort ventilation in the afternoon increases the thermal comfort period. For the optimum window-opening control to maximize thermal comfort in the hot and humid climate, an indoor temperature of 27 °C can be considered a criterion to open the windows for comfort ventilation in addition to night ventilation for the thermal storage effect. When this criterion was applied, the thermal comfort period in the room with PCMs increased to 83.3 %. Accordingly, the reduction in electricity consumption for space cooling was 41 % less than that in a control room without PCMs.
Highlights A coupled TES model evaluating thermal comfort was constructed. The coupled TES calculated wind speed accurately with the light calculation load. The proposed system using PCM achieved thermal comfort period of 83 % for a year. An optimum window-opening control to maximize annual thermal comfort was clarified. Indoor temperature of 27 °C and nighttime can be criteria to open window.
Optimum window-opening control for naturally ventilated buildings with phase change materials in the hot and humid climate of Indonesia
https://orcid.org/0000-0001-7505-0916
Abstract This study aims to determine the optimum window-opening control that maximizes annual thermal comfort using ventilative cooling, i.e., night and comfort ventilation, in naturally ventilated buildings where phase change materials (PCMs) are used. A thermal energy simulation (TES) coupled with an airflow network model was constructed to evaluate the comfort ventilation and thermal storage effects of the PCMs by controlling the window-opening patterns. The EnergyPlus-based coupled TES model was validated by comparing with the field measurement results of a full-scale experimental building in Indonesia. The root-mean-square errors of the temperature and air speeds at the center of the target building ranged from 0.2 to 0.5 °C and 0.1–0.2 m/s, respectively. The accuracy of the coupled TES was similar to that of computational fluid dynamics coupled with the heat balance analysis, which can simulate the spatial distributions of temperature and air speeds. The annual simulation results showed that prioritizing the thermal storage effect of the PCMs in the morning and comfort ventilation in the afternoon increases the thermal comfort period. For the optimum window-opening control to maximize thermal comfort in the hot and humid climate, an indoor temperature of 27 °C can be considered a criterion to open the windows for comfort ventilation in addition to night ventilation for the thermal storage effect. When this criterion was applied, the thermal comfort period in the room with PCMs increased to 83.3 %. Accordingly, the reduction in electricity consumption for space cooling was 41 % less than that in a control room without PCMs.
Highlights A coupled TES model evaluating thermal comfort was constructed. The coupled TES calculated wind speed accurately with the light calculation load. The proposed system using PCM achieved thermal comfort period of 83 % for a year. An optimum window-opening control to maximize annual thermal comfort was clarified. Indoor temperature of 27 °C and nighttime can be criteria to open window.
Optimum window-opening control for naturally ventilated buildings with phase change materials in the hot and humid climate of Indonesia
https://orcid.org/0000-0001-7505-0916
Abstract This study aims to determine the optimum window-opening control that maximizes annual thermal comfort using ventilative cooling, i.e., night and comfort ventilation, in naturally ventilated buildings where phase change materials (PCMs) are used. A thermal energy simulation (TES) coupled with an airflow network model was constructed to evaluate the comfort ventilation and thermal storage effects of the PCMs by controlling the window-opening patterns. The EnergyPlus-based coupled TES model was validated by comparing with the field measurement results of a full-scale experimental building in Indonesia. The root-mean-square errors of the temperature and air speeds at the center of the target building ranged from 0.2 to 0.5 °C and 0.1–0.2 m/s, respectively. The accuracy of the coupled TES was similar to that of computational fluid dynamics coupled with the heat balance analysis, which can simulate the spatial distributions of temperature and air speeds. The annual simulation results showed that prioritizing the thermal storage effect of the PCMs in the morning and comfort ventilation in the afternoon increases the thermal comfort period. For the optimum window-opening control to maximize thermal comfort in the hot and humid climate, an indoor temperature of 27 °C can be considered a criterion to open the windows for comfort ventilation in addition to night ventilation for the thermal storage effect. When this criterion was applied, the thermal comfort period in the room with PCMs increased to 83.3 %. Accordingly, the reduction in electricity consumption for space cooling was 41 % less than that in a control room without PCMs.
Highlights A coupled TES model evaluating thermal comfort was constructed. The coupled TES calculated wind speed accurately with the light calculation load. The proposed system using PCM achieved thermal comfort period of 83 % for a year. An optimum window-opening control to maximize annual thermal comfort was clarified. Indoor temperature of 27 °C and nighttime can be criteria to open window.
Optimum window-opening control for naturally ventilated buildings with phase change materials in the hot and humid climate of Indonesia
Kitagawa, Haruka (author) / Asawa, Takashi (author) / Hirayama, Yukari (author)
Building and Environment ; 245
2023-10-02
Article (Journal)
Electronic Resource
English
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