| Reducing the building energy consumption plays a significant role in completing the energy conservation and emissions reduction target of the whole society. Improving the thermal insulation performance is an important way to save building energy. Phase change material (PCM) which is filled in the windows can increase the heat capacity of the windows. As a result, the PCM-filled window has the function of adjusting the cooling load and heating load of the building. However, as more and more researches are conducted on the double-pane windows filled with PCM (DW+PCM), despite of the above-mentioned advantages, some problems related to the DW+PCM appeared, including the overheating risk in the summer daytime, the unnecessary heat released into the building during the discharge period of PCM, the increasing heat load of the building beacause of the big thermal conductivity and so on. In order to solve the above problems, a novel triple-pane window filled with PCM (TW+PCM) is put forward on the basis of DW+PCM. PCM is filled in the outer cavity and air in the inner one. Experiments and simulations to investigate the thermal properties of the TW+PCM are conducted and energy analysis related to TW+PCM are made by eQUEST.Firstly, comparative experiments of TW+PCM and refernece windows (DW+PCM and TW) are conducted. Temperature and heat flux on the interior surface of the above widows in summer days are obtained. Result shows that the TW+PCM had the function of reducing the air temperature fluctuation indoors and the cooling load. In the sunny summer day, The peak temperature on the interior surface of the TW+PCM reduces by 2.7℃ and 5.5℃ respectively,which means the overheating risk has been controlled, and heat entered the building through the TW+PCM reduces by 16.6% and 28% respectively, compared with DW+PCM and TW. In the rainy summer day, the peak temperature on the interior surface of the TW+PCM has a little reducement, and heat entered the building through the TW+PCM reduces by 14.7% and increases by 4.5%, compared with DW+PCM and TW respectively.Secondly, on the basis of experiment research, the numerical models of TW+PCM, DW+PCM and TW are established to investigate the dynamic thermal performance of themselves. The simulation result of FLUENT presents that in the representative summer days. TW+PCM can reduce the peak temperature on the interior surface, avoilding the overheating risk, and decrease temperature fluctuation indoors and cooling load. In the representative winter days, the temperature fluctuation on the interior surface reduces apparently and the heat flux on the interior surface has an apparent reducement compared with the DW+PCM. The heating energy consumption increases. The heat flux on the interior surface has a little increasement compared with the TW especially in the night. Additionally, the influence of location of the PCM layer in the thermal properties of the TW+PCM is also investigated.Finally, in order to investigate the influence of TW+PCM in building energy consumption. Energy analysis of a residential construction contained the above three windows is made. Result shows that the coiling energy consumption of the building adopting TW+PCM reduces by 9.45% and 3.06%, the heating energy consumption reduces by 9.5% and 18.33%, the annual energy consumption reduces by 4.55% and 8.16, compared with the building adopting TW and DW+PCM respectively. The TW+PCM can achieve heat insulation in summer and heat conservation in winter, which has a good energy saving potential. |
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