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Simulation Study of Discharging PCM Ceiling Panels through Night-time Radiative Cooling PCM天花板夜间辐射散热的模拟研究
进行了一项模拟研究,以检验使用光伏/热(PV/T)板和无釉太阳能集热器通过夜间辐射冷却生产冷水的可能性。在冷却期间(5月1日至9月30日),三个不同城市(哥本哈根、丹麦、米兰、意大利和希腊雅典)的办公室使用冷水作为冷却介质。为了给办公室降温,使用了包括相变材料(PCM)在内的辐射天花板。雅典和米兰的工作温度在EN 15251(23)的III类范围内- 26°C,73.4-78.8°F),分别占81%和82%的入住率,而在哥本哈根,63%的入住率在同一范围内。夜间辐射冷却为哥本哈根提供22%,为米兰提供10%,为雅典提供4%的冷却能量,用于排放PCM。哥本哈根在模拟期间的总发电量为94.4 kWh/m²(29900 Btu/ft²),而米兰和雅典的总发电量分别为96.7 kWh/m²(30700 Btu/ft²)和111.7 kWh/m²(35400 Btu/ft²)。结果表明,在北方气候条件下,夜间辐射供冷是为办公楼提供空间供冷的一种令人满意的解决方案。 通过实施遮阳系统和更精确的控制策略,可以提高装置的性能。引用:2016年年度会议,密苏里州圣路易斯,会议论文
A simulation study was conducted to examine the possibility of using PhotoVoltaic/Thermal (PV/T) panels and unglazed solar collectors for producing cold water through night-time radiative cooling. The cold water was used as the medium for cooling an office in three different cities (Copenhagen, Denmark, Milan, Italy and Athens, Greece) during the cooling period (1st of May - 30th of September). For cooling the office, radiant ceiling panels including Phase Change Material (PCM) were used. In Athens and Milan the operative temperature was within the range of Category III of EN 15251 (23 - 26°C, 73.4 - 78.8 °F) for 81% and 82% of the occupancy period respectively, while in Copenhagen it was within the same range for 63%. Night-time radiative cooling provided for Copenhagen 22%, for Milan 10% and for Athens 4% of the cooling energy required for discharging the PCM. The total electricity produced in Copenhagen for the simulated period was 94.4 kWh/m2(29900 Btu/ft2), while for Milan and Athens it was 96.7 kWh/m2(30700 Btu/ft2) and 111.7 kWh/m2(35400 Btu/ft2)respectively. It was concluded that night-time radiative cooling can be a satisfying solution for providing space cooling to office buildings in northern climates. The performance of the installations could be improved by implementing a solar shading system and a more precise control strategy.
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