This course focuses on understanding the basic concept and engineering theory of mechanical systems in buildings so as to provide students not only with the elementary knowledge required for advanced courses in mechanical system engineering, but also with the basic information for the engineering consulting in electrical system & fire protection, structural design and construction. In this course we will study the basic concepts of air flow in buildings and viscous flow in duct and pipes which include the following: pressure, fluid properties, basic physical laws of fluid mechanics, internal flow of pipe, pressure losses in liquid and air system, prime movers(pump & fan), and flow measurement. This course will also examine the application methods of mechanical systems in buildings such as the design and control of piping and air system and TAB(Testing, Adjusting & Balancing).