Comprehensive application of air energy in underground space of a super large project

An underground space project with a total floor area of more than 0.7 million square meters in Xi’an has an average underground depth of more than 10 meters. In order to make full use of the air energy in the underground space, the ventilation of the underground space is systematically discharged to the outdoor unit side of the air-source heat pump and the air inlet side of the cooling tower. The outdoor air of the air conditioning unit is precooled in summer and preheated in winter through the horizontal civil duct laid underground. Through the establishment and calculation of a theoretical model, analyses energy-saving and economic potential of air energy utilization in underground space. The measured data after the project operation are in good agreement with the analysis results.