分布式发电（DG）系统是一种可以降低建筑物运行成本的现场发电系统。分布式发电系统比集中式系统效率更高，因为它们在现场发电和消耗电力。该系统由一台内燃机、一台发电机、一台空调机组和一个热水储罐组成，并带有附加的次要部件。利用天然气，发动机产生可用的能量，并通过发电机转化为电能。发动机还产生可用的（或浪费的）热量，这些热量通过联合冷却、热量和功率（CCHP）系统传输到热水储水箱。 发动机排出的额外热量通过热交换器加热建筑物。发电机产生的电力用于为空调机组供电，并为电器提供电力。本研究的目的是确定主要设备的最佳尺寸，以满足典型住宅建筑的年能源需求。优化DG系统主要设备的尺寸将产生足够的数据，使实施变得切实可行。引用:ASHRAE论文:2015年ASHRAE年会，佐治亚州亚特兰大

A distributed generation (DG) system is an on-site power generating system that can reduce the operating cost of a building. DG systems are more efficient than centralized systems because they generate and consume power on-site. The system modeled is a combination of an internal combustion engine, an electric generator, an air conditioning unit, and a hot water storage tank, with additional minor components. Using natural gas, the engine generates usable energy which is converted to electricity through a generator. The engine also produces usable (otherwise wasted) heat, which is transferred to the hot water storage tank by the combined cooling, heat, and power (CCHP) system. Additional heat rejected from the engine passes through a heat exchanger in order to warm the building.The electricity generated by the generator is used to power the air conditioning unit and provide power for appliances. The purpose of the study was to determine the optimum size of the main equipment to supply the annual energy demand of a typical residential building. Optimizing the size of the main equipment of a DG system would produce enough data that make implementation practical.