The pipe-embedded window is a double window structure with pipes embedded inside the cavity to adjust the temperature. The preliminary studies showed that it can significantly reduce the cooling load of buildings with natural cooling sources such as the water from cooling towers in summer. However, the research on the influencing factors of the pipeembedded window is insufficient. In this paper, the numerical calculation models are established for a pipe-embedded window and a traditional

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... The influence of climatic factors, such as the natural cooling source temperature and outdoor air temperature on the thermal performance of the pipe-embedded window are studied. Based on these, the building energy efficiency is analysed. The results show that the thermal resistance of the pipeembedded window is basically constant. A linear relationship has been found between the inner surface heat flux, pipe heat flux, interlayer mean air temperature and the outdoor air temperature, mean water temperature or solar radiation intensity. The solar radiation intensity, water temperature, outdoor air temperature is ranked from most to least influence. The location of pipe has little effect on the temperature field and heat transfer of a pipe-embedded window. In summer, the difference between inner-glass and outer-glass insulation is small.