As the water source heat pump technology uses surface water as the air conditioning unit cooling and heating source, so it has the following advantages: 1. Is a renewable energy technology water source heat pump is the use of the Earth's water storage of solar energy resources as a source of heat and energy for energy Conversion of heating and air conditioning system. Among the available water bodies are groundwater or rivers, rivers and lakes that are part of the surface, and oceans. Surface soil and water bodies are not only huge solar collectors that collect 47% of the solar radiation energy, more than 500 times the amount of energy used annually by human beings (underground water bodies receive indirect solar radiation energy through the soil) and are A huge dynamic energy balance system, the soil and water on the surface naturally maintain the relative balance of energy acceptance and divergence. This makes it possible to utilize almost infinite solar energy or earth stored therein. So, a water source heat pump uses a technology that is clean and renewable. 2. Energy efficient water source heat pump unit available water temperature in winter is 12-22 ℃, the water temperature is higher than the ambient air temperature, so the heat pump cycle evaporation temperature increases, the energy efficiency ratio also increased. The summer water body is 18-35 ℃, the temperature of the water body is lower than the ambient air temperature, so the condensing temperature of the cooling decreases, making the cooling effect better than the air-cooled and cooling towers, and the unit efficiency is improved. According to the EPA of the United States Environmental Protection Agency, the design and installation of a good water source heat pump can save 30-40% of the heating and cooling air-conditioners on average. 3. Stable and reliable operation The temperature of water body is relatively stable throughout the year, the range of its fluctuation is far less than the change of air. Is a very good heat pump heat source and air conditioning cold source, water temperature is more constant characteristics, making the heat pump operation more reliable and stable, but also to ensure the system's efficiency and economy. There is no air source heat pump in winter defrost and other difficult issues. 4. Significant environmental benefits Water source heat pump uses electricity, which itself is a clean energy source but consumes primary energy and causes emissions of greenhouse gases such as pollutants and carbon dioxide when generating electricity. Therefore, the pollution of energy-saving equipment itself is small. The power consumption of well-designed water-source heat pump units is equivalent to a reduction of more than 30% compared to air-source heat pumps, which is equivalent to a reduction of more than 70% when compared to electric heating. Water source heat pump technology used by the refrigerant, can be R22 or R134A, R407C and R410A alternatives such as co-quality. Water source heat pump units operate without any pollution and can be built in residential areas without burning, without fumes or with waste, without the need to stack fuel waste and without the heat from long distances. 5. A multi-purpose machine, wide range of applications Water source heat pump system can be heating, air conditioning, but also for domestic hot water, a multi-purpose machine, a system that can replace the original boiler plus air conditioning two sets of devices or systems. Especially for buildings with both heating and cooling requirements, water-source heat pumps have obvious advantages. Not only saves a lot of energy, but also with a set of equipment to meet both heating and cooling requirements, reducing the initial investment of equipment. Water source heat pump can be applied to hotels, shopping malls, office buildings, schools and other buildings, small water source heat pump is more suitable for residential heating, air conditioning. Automatic operation of water source heat pump unit due to stable conditions, so you can design a simple system, fewer components, simple and reliable unit operation, low maintenance costs; a high degree of automatic control, the service life of up to 15 years. Of course, like any thing, water source heat pump is not perfect, its application will be constrained. (1) Available Water Source Conditions The water source heat pump can theoretically make use of all water resources. In fact, the cost difference between different water resources utilization is quite large in practical projects. So in different regions whether there is a suitable water source heat pump applications become a key. The current water source heat pump use, the closed system is generally higher cost. The open system, can find the right water to become a source of heat pump restrictions. On the open system, water requirements must meet a certain temperature, water and cleanliness. (2) Restrictions on the Geographical Structure of the Aquifer For the use of underground pumping and recharge, the geologic structure of the site to be used must be taken into account to ensure that wells can be drilled under economic conditions to find suitable sources of water, taking into account the local geology and soil Conditions to ensure that after the tail water can be achieved. (3) The economic efficiency of investment Due to the different basic conditions of water resources caused by different regions, different users and the country's energy policies and fuel prices, the one-time investment and operating costs will vary from user to user. Although, on the whole, water-source heat pumps operate at a higher cost and with lower costs, However, compared with the traditional air-conditioning and cooling heating methods, the water-source heat pump investment economy will be different under different requirements of different regions.