Introduction：Beijing Sheng Jin Jia Yuan project is east to the Financial Street downtown, North to Zhongguancun economic; overlook the west of Xishan scenic spot. The community has an area of 43,400 square meters, with total construction area of 136,000 square meters. We provided all heat exchangers include: two set of heat exchangers, one set of soften water unit, one soften water tank and one condensation water recycling unit in 2007.