The building sector accounts for more than 40% of the global energy consumption. This consumption may be lowered by reducing building energy requirements and using renewable energy in building energy supply systems. Solar air-conditioning systems (SACS) are a promising solution for the reduction of conventional energy in buildings. The storage, especially the cold storage, plays an important role in SACS for unstable solar irradiation. In this paper, we took the absorption refrigerating unit as an example, and the solar air-conditioning system of an office building in Beijing was simulated. The accuracy of this model was verified by comparing with the SACS operation data. Moreover, based on the simulation data, the cold storage capacity of the solar air-conditioning system in different climatic regions was studied. The cold storage capacities of SACS in 20 cities distributed in different climate regions were studied systematically. The results simulated by our proposed model will be beneficial to the SACS design, and will enlarge the application of SACS. 建筑业能耗占全球总能耗的40%以上。通过减少建筑本身的负荷需求和在建筑供能系统中使用可再生能源的方式可以降低这部分能耗。太阳能空调系统（Solar air-conditioning system 以下简称SACS）是一种用于减少建筑行业常规能源应用的有效方法。为了解决太阳能的不稳定性，SACS蓄能部分，尤其是蓄冷装置是十分重要的。在本文中，作者以北京某办公建筑的太阳能空调系统为例，对系统进行了模拟分析。通过与实测数据对比，模型的准确性得到了很好地验证。基于模拟模型，对不同气候区太阳能空调蓄冷装置的蓄冷量进行了分析，并系统的对不同气候区的20个城市SACS系统的制冷能力进行了详细地研究。我们的计算结果将有利于辅助SACS在中国各地设计与推广。