A Lake Water Source Heat Pump System Heating Characteristics And Energy Conservation Research

With the rapid development of the economic in China, the situation of energy becomes more and more severe. Because of the high consumption and increasing requirement, there is a contradiction between supply and requirement. Furthermore, the waste of energy in our country still seriously and our awareness of energy conservation and energy management is weak, so there haven't have an effective energy monitoring system yet. To face the serious condition, implementing an effective measure of saving energy is an important way to improve the capacity of supplying clean energy, especially renewable energy. At the same time, it reduces the pressures of resources, ecological and environmental, improving the efficiency of energy.It takes the main teaching building of Chongqing University as an example and makes the lake water source heat pump which has been reformed to be a subject of study in this article.Focus of the energy-saving project of air-conditioning system is less, it makes a detailed description of the energy saving transformation design of the main teaching building,especially for the heat source design of lake source heat pump system, drainage, water access and the treatment design. It's give an important .reference to other project.Through the data of Test to analysis the winter heating characteristics of the lake source heat pump, it can get a curve of the machine's efficiency based on the load rate, the accessing water temperature and the returned hot water temperature. It's the basis of energy efficiency prediction, pump frequency conversion control and the energy saving effect of the heating system.The five forms of joint operation performance curve equation of pump are deduced. It analyses the water pump connection form in the actual project and sure the two operation ways of water pump operation characteristics. It quantitative analyses the pump flow, energy consumption, efficiency. It contrasts of the energy saving with the valve adjusting mode and determines the energy saving rate under different speed. It explains the operation characteristic and energy-saving of the water pump connection form after the reform and provides the reference for other energy saving reconstruction projects to adopt the water pump connectionThrough the theoretical calculation, it analyses the water quality, quantity and water temperature conditions. By using the fluent simulation software, the cold lake drainage cause temperature change is simulated. Simulation established the physical model of water and the mathematics model, and the simulation of boundary conditions and initial conditions are confirmed. To simulate the temperature of the water and the quantity of the water effect on temperature field of the lake, it is concluded the right way to recover the lake water temperature. It provides the reference for the operation of water source heat pump in winter.Based on the measured data and the theoretical analysis, the water source heat pump system, the electric heating boiler system, air cooled heat pump system and boiler system four schemes are contrasted on energy-saving economic. From the test conditions and the heating season working condition, the energy consumption and the system efficiency system are contrasted. On the two conditions, the energy saving, energy saving rate and the heating efficiency of the water source heat pump system are the biggest, and the operating costs and carbon dioxide emissions are the least of the three. The lake water resource heat pump system initial investment is less, and it covered a small area .It explained that the water source heat pump system transformation lake realized the primary purpose of energy-saving reform, and have achieved good economic and environmental benefits.