飞速发展的计算机技术和信息技术带来了建筑设计技术的革命，同时也为空调系统的设计提供了有益的工具。本文结合三维建模技术与建筑信息模型新理念，进行家用中央空调系统设计软件开发的研究。 论文研究以家用中央空调设计流程为主线，结合SketchUp软件强大的三维参数模型功能，并借助SketchUp软件平台、运用Ruby语言和网络语言进行编程，对SketchUp软件进行二次开发，初步实现了家用中央空调系统负荷计算、设备选型及建模的三维参数化设计三大功能。主要结论如下： （1）在对SketchUp应用环境和网络数据研究论证的基础上，建立了三维参数化家用中央空调设计软件的基本理论，覆盖了初始参数输入、建筑冷负荷计算、设备自动选型和插件界面四部分的软件框架。软件编程的前期设计中，综合考虑了三维参数化建模技术、建筑信息模型技术和网络技术。 （2）应用建筑信息模型的理念，在网络环境中实现了参数输入功能和设备选型功能，统一了数据结构，构建了网络模型数据库和参数数据库，并编程实现了网络数据库与本地软件的双向参数传递功能。 （3）基于SketchUp网络环境平台，完成了家用中央空调系统设计的软件开发，并把软件应用到实例中加以验证。结果表明：与其他空调设计软件相比，采用本软件可以提高空调系统负荷计算的效率，减少空调系统设备选型设计时间。 （4）本文编写的家用中央空调设计插件，使设计思想迅速转变为直观的三维模型，从而打破了传统设计方式对设计人员的思想束缚。基于网络的建筑信息模型的软件设计思想，对暖通、结构、给排水等建筑设计软件开发有一定的参考价值。

The rapid development of computer technology and information technology has brought revolution in building design technology, also supplied a useful tool for the design of air-conditioning system at the same time. In this paper, three-dimensional modeling and the new ideas of building information model being combined, carried out on the research of home central air-conditioning system design software development. The main line of the research is design process of Home central air-conditioning, combined with the features of powerful three-dimensional parametric model in SketchUp, and with the software platform of SketchUp,use Ruby and network programming language, a secondary development is applied to SketchUp software. Initial realized three functions: home central air-conditioning system load calculations, equipment selection and modeling three-dimensional parametric design capabilities. The main conclusions are as follows: (1) Based on the research of the application environment with SketchUp and network-based data. Established the basic theory of three-dimensional parametric design software of home central air-conditioning system. Covered the initial parameter input, building cooling load calculation, equipment automatic selection and plug-in interface. The early stage of the software programming design considering the three-dimensional parametric modeling, building information modeling technology and network technology. (2) Implemented parameters input and equipment selection functions in a network environment, by application the concept of the building information model. Unified data structure, built a network model database and a parameter database and programmed a transfer function of network database and local software. (3) Complete software development of Home central air-conditioning system design with Web-based environment, and proved the functions through application. The result show that using the software can improve the air conditioning system load calculations work efficiency and reduce the selection time of air-conditioning system equipment design. (4) The design plug-in of Home central air-conditioning make intuitive design rapid change three-dimensional model, thus breaking the traditional designs on the designer's ideological restraints. Building information model based software design, has some reference value to HVAC, structure, drainage and other architectural design software development.