18. Key Technology and Economic Analysis of Using Fujiang River Water as the Cooling and Heating Sources for Air Conditioning System

In order to use the river water, a new renewable energy, as the cooling and heating sources for the air conditioning system, the temperature, quality and quantity of water in the downstream of Fujiang River is analyzed; it is believed that it is suitable to use the properly processed river water as the cooling and heating sources for the air conditioning system. The floor area ratio in the riverside is relatively high and the building coverage ratio is large, and its horizontal and vertical distances to Fujiang River are short; therefore, those favorable conditions contribute to the application of the river water source heat pump air conditioning system. With a residential community in downstream of Fujiang River as the research object, the system mode and water intake method for the water resource heat pump air conditioning system are analyzed; it is believed that it is advantageous to adopt the open system and direct water intake method; referring to the existing performance model of the heat pump unit, the operation of the water resource heat pump system is optimized with the aim of high energy efficiency; it is further believed that the energy efficiency ratios in the heating and cooling seasons reach 4.12 and 4.42 respectively. Compared with the conventional air conditioning system, the energy cost saving rate for adopting the river water source heat pump unit is 23.78%. The harmful gas emission reductions are as follows: CO₂: 3450.09t/a, SO₂:14.58t/a, NO₂:5.73t/a, smoke dust: 100.12t/a, with reduction amplitudes of 66%, 54%, 55% and 53% respectively. The application of river water source heat pump unit for water intake and discharge in the downstream of Fujiang River has little influence on water in Fujiang River. The research provides reference for the application of river water source heat pump air conditioning system in the downstream of Fujiang River.