Under the effects of climate change and overexploitation, heat absorbing building materials are used extensively in the present urban environment, the impervious pavements are increased greatly, and the area of green belt is insufficient, the urban ambient temperature rises year after year, and the extensive application of air conditioning increases the energy consumption, leading to the vicious circle of heat in cities. In recent years, how to build a sustainable environment and a comfortable life is discussed and sought by various countries. The underground cold/geothermal application depends on groundwater temperature stability and flow velocity. A constant groundwater temperature can provide cooling source or heating source for the building walls effectively, and a stable groundwater velocity decides whether the heat source can diffuse in time, so as to keep the heat exchange stable. In this study, two experiment rooms were established in an all-sunlight environment for small pilot tests of the underground water cooling system; a 60-meter deep functional well was built to for a long-term measurement of the temperature of underground water, and it was integrated with the underground water cooling system to find out the best flow (0.1m3/h). As for the collection of the conditional parameters, the conditional setting for the computer flow field analysis was offered so as to make a more accurate simulation of an overall thermal environment. Fluent– CFD adopted in the study could simulate the temperature transmission among the sun, the underground water cooling system as well as the indoor and outdoor space. The results show that the distribution of cooling pipeline influences the heat transfer effect; the system with excessive spacing causes heat transfer, so that the inner wall temperature rises. The analysis also shows that if the cooling pipes are dense enough, the temperature difference between pipes is only 0.5℃, the overall temperature range is 27.5 to 28℃. The simulation analysis shows that the maximum temperature of L0 (temperature between pipelines is 27℃) is lower than the maximum temperature of Section LL (temperature between pipelines is 28℃), meaning the heat will not be transferred from the outer wall to the interior in this state. In terms of the thermal insulation wall with a cooling pipeline, the east and west walls have slight effect on the heat source in the building, the heat is mainly from the rooftop at noon. And the inner-outer wall temperature difference is almost 4℃ after the cooling system is mounted, the inner wall temperature remains stable. According to research results of the all-sunlight environment, this study analyzed the setting of the groundwater thermals barrier system, with the hope of finding out the main conditions for improving the thermal environment and enhancing comfort as well as giving substantial information to design or management institutions. Heat enters the indoor space through thin building shells like walls and windows and would increase the indoor temperature of buildings, reduce comfort and directly influence the energy consumption of air conditioning. According to the analysis of the ground water cooling system, we can know the thermal distribution and transmission and find out the best system. The results will be of great help for the future establishment and management of ground water cooling system and be taken as reference information for planners.

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