The Operation Strategy Of Solar Assisted Water-Source Heat Pump Heating System

With the development of building energy conservation, utilization of new, efficient, clean and renewable energy is imperative. With the characteristics of highly efficiency and clean, Water-Source Heat Pump,is widely known as a renewable energy technology. Unfortunately, in most northern cities in China, low-grade water temperature is sometimes too low to greatly reduce the coefficient of heat pump's operation performance. One solution for adding additional heat is to improve system evaporation temperature, energy efficiency of the system will be increased at the same time. In most parts of China, Solar Energy is abundant. Therefore, efficiency of energy use can be increased by using solar energy assisting Water-Source Heat Pump and this would bring in energy efficiency in system. This paper aims to propose high-efficiency operation strategy which combines with the short-term heat storage and Water-Source Heat PumpFirstly, this paper presents a kind of Solar Assisted Water-Source heat pump heating system on the basis of The indirect expansion solar assisting Water-Source Heat Pump, operation mode of the system is analyzed. Solar system collector and heat storage tank measures are determined in the following parts.Secondly, the short-term joint regenerative energy system, run two systems policies are proposed specific to the short-term joint regenerative energy system,which are the shortest time heat storage strategies and solar direct supply policy priority respectively. Analysis methods are demonstrated in the following parts:according to the typical annual solar radiation data in the calculation of the heating season, the cumulative maximum, minimum, and average solar radiation intensity, and in the span of, in accordance with the principles of arithmetic series, more than a typical day. Where in the daily cumulative radiation lower than typical daily average only the shortest heat storage strategy is discussed while higher than the average of typical day is three operation methods are discussed and compared. Three operating strategies are compared serving system efficiency target.In addition, TRNSYS simulation platform build system modeling is used basing on above methods. Key parameters in the model is set to conform to the practical engineering projects. Comparison of solar collectors, heat storage system simulation and test data, rationality of the model. Simulation results is verified.The simulation results demonstrated that show system running policy greatly influenced by solar irradiance and system configuration.Finally, using COP as an evaluation indicator, this article analysis the impacts of collector area and the heat storage tank capacity on the running policy, and the effects of direct supply of start-up temperature on the strategy as well. This paper aims to provide reference Short-term heat storage of solar assisting Water-Source Heat Pump system in different system configurations and tactics weather conditions.