With the increasing awareness of energy conservation, environmental protection, and emission reduction in the country and society, various energy-saving and environmentally-friendly products have rapidly emerged in the central air-conditioning market sales, and a series of products such as centrifugal heat pump units, sewage source screw units, and water sources have emerged. New products such as online groups. Under the vigorous promotion of Hitachi, Midea, EK and other brands, the water source multi-line unit received greater attention in 2011 and became one of the most popular products in the domestic central air conditioning market in 2011.

　　 Water source multi-unit air-conditioning system is a multi-unit air-conditioning system in which water is used as a source of cold and heat. It is composed of water side, main engine and indoor side. The cold and heat source side is the same as the water source heat pump system, using water as the energy transport medium; the indoor side is the same as the multi-line system, using refrigerant as the energy transport medium.

The water source multi-connected air conditioning system successfully combines water source heat pump technology, multi-line technology and such as DC variable frequency drive technology, R410A environmentally friendly refrigerant, etc., which combines air-cooled multi-connected variable frequency air conditioners and water-cooled chillers. Technical advantages, through high-efficiency plate heat exchangers and intermediate medium circulating water, the use of heat from low-grade heat sources such as the ocean, soil, industrial waste heat, and urban sewage for cooling and heating, greatly saving energy.

In the market, currently, Hitachi, McQuay, Samsung, Midea, Mitsubishi Electric, EK and other brands have launched water-source multi-connected air-conditioning units. Take Hitachi, which is currently more active in the water-source multi-connected market, as an example, following the acquisition of Pangu After the recognition of Daguan and other well-known real estate projects, Hitachi Water Source Multi-line Group has recently emerged in the Zhenjiang Financial Building project in Jiangsu Province. The winning bid amount of close to 25 million has also become one of the major domestic orders of Water Source Multi-line Group. The project will be officially put into use in May next year.

　　 Zhenjiang Financial Building is located in the center of the core urban area of ​​the new district, south of Gangnan Road and west of Yinshan Road. It is the first landmark building constructed in the central business district. The total investment of the project is about 350 million yuan. The total height of the building is 100 meters. The ground is composed of a 24-story high-rise office building and three groups of 3-story financial and office podium buildings. There are two underground floors, which are staff restaurants, garages, equipment rooms and partial air defense. Up to more than 60,000 square meters. Such large-scale buildings with diverse and dense use areas inevitably impose strict standards and requirements on central air-conditioning suppliers that provide heating and cooling services.

The Hitachi water source frequency conversion multi-connected central air conditioner that won the bid for the Zhenjiang Financial Building project is a conventional 8-20 HP product, which is suitable for a variety of climate environments and a wide range of water sources. The heat pump technology can effectively utilize the urban low-temperature pipe network, rivers and lakes. Low-grade heat sources such as sea water source, sewage source and soil source are used for building cooling and heating. During operation, there is no smoke and pollution, low noise and no water consumption, which truly realizes the clean use of renewable energy.