Simulation And Study Of Hot Water System Based On Solar Chemical Heat Pump

With the rapid development of China’s economy,energy consumption cannot be ignored as an increasingly prominent problem,and the ecological and environmental problems are still very serious.In response to the nation’s call for "green water,green mountains,and golden mountains and silver mountains;green water,green mountains are golden mountains and silver mountains," which improves energy efficiency and energy conversion efficiency,renewable energy has developed rapidly in recent years.As the emerging clean energy in the 21 st century,its utilization technology is becoming more and more mature.However,because solar energy is affected by factors such as its instability and discontinuity,so its application will still be limited.The traditional vapor compression heat pump reduces the primary energy utilization rate,because it requires the work of a compressor and cannot use thermal energy as a direct drive energy source.A chemical heat pump hot water system based on solar energy and solid phase calcium chloride dimethanol complex which can also achieve heating and cooling at the same time was designed in this paper by analying of solar energy utilization and chemical heat pump.Chemical heat pump,as a device that converts thermal energy into chemical energy,absorbs and releases heat through the state change of matter in a reversible reaction.It does not require a compressor to perform work,so it is a new type of energy-saving technology with high efficiency and environmental protection.The system uses the heat provided by the solar collector as the main energy source,and uses the chemical reactions occurring in the reactor to power the system cycle without the need to consume mechanical energy,which achieves the energy savings.In order to improve the uniformity of the heat flux density of the solar energy and avoid the heat loss of the solar energy,the branch of the liquid methanol reservoir is designed,thereby achieving the energy storage and the full utilization of the solar energy.The design of the dual reactor ensures the continuous operation of the system based on previous improvements.From the perspective of thermodynamics,this paper uses Simulink simulation modeling and CFD simulation to analyze the heat transfer characteristics of the reactor and the cycle performance of the system.The simulation model is used to obtain the heat transfer capacity of the condenser and evaporator under the corresponding parameters,as well as the performance coefficient of the system.The mathematical model was established to analyze the reactor by CFD,and the influence rules of specific heat capacity,thermal conductivity and initial temperature on the reactor temperature distribution were obtained.The heat transfer characteristics and temperature field change laws of the reactor during the working process were analyzed.In order to verify the accuracy of the simulation results and better explore the working characteristics of the reactor,this research designed and constructed an experimental bench based on the desorption reaction.Take several points in the reactor for temperature collection to get the temperature of each measurement point at different times.The experimental data was fitted to obtain the temperature change curves of different measurement points with time,and the results were compared with the simulation curves to verify the accuracy of the simulation results.The solar chemical heat pump hot water system designed in this paper has high economic and environmental benefits.It will promote the further research and promotion of solar energy applications and chemical heat pump technology through the analysis and research of the system.