In order to determine the effects of the phase change material filled glass window (PCMW) on building energy consumption in the hot summer and cold winter area of China

dynamic heat transfer process and heat transfer parameters of the PCM filled glass window and the hollow glass window (HW) exposed to different non-steady boundary conditions related to the climatic characteristic of the sunny and rainy days both in summer and winter were investigated. The experiments of the dynamic heat transfer process of PCMW and the hollow glass window (HW) in a representative sunny summer day were conducted

and the one dimensional numerical simulations under the same condition were conducted. The temperatures of the interior surfaces of the two kinds of window were obtained. The results of experiment and simulation were in good agreement. Then the validated numerical model was used to simulate the dynamic heat transfer processes of the two kinds of windows at more different weathers which were representative both in summer and in winter

the temperature and heat flux fluctuations on the interior surfaces of the two glass windows were analyzed based on simulation results. According to the obtained results

it was concluded that in the representative sunny summer day

the peak temperature on the interiorsurface of the PCMW (glauber's salt) reduced by 10.2℃

and the heat entered the building through the PCMW (glauber's salt) reduced by 39.5%

comparing with the hollow glass window. However

in the representative rainy summer day

the representative sunny winter day and the representative rainy winter day

the dynamic thermal performance of the PCMW (glauber's salt) was unsatisfactory as it cannot decrease the building energy consumption. Long period measurements and monitoring of the PCMW will be further researched to validate long term performance prediction based on numerical simulation.