| Solar and geothermal energy are clean and renewable energy, they are verywidely distributed on earth and how they can be more effective development andutilization of them has become a hot global hotspot, the building is one of theimportant fields of application.As the domestic hot water consumption occupy a largeproportion of energy consumption in the civil construction, the use of renewableenergy to produce domestic hot water is worth studying.By analyzing the advantages and disadvantages of single-source heat pump andaccording to the climatic characteristics of Changsha, the paper proposed the designand operation mode of the hybrid solar-ground source heat pump hot water system toproduce domestic hot water stable and efficient, then carried out its runningsimulation study.At first, the paper use a student dormitory hot water system in Changsha for thestudy, briefly introduced the design process of the electric auxiliary heating solar hotwater systems and ground source heat pump hot water system, including hot waterdemand determination and calculation of main equipment selection process. Thenprovided a brief introduction on software for the system simulation in this article andestablished these two hot water system models based on the software simulationplatform, then conducted a long-term running simulation study on them. The articleobtained the optimized design parameters of these two hot water systems andconcluded the results of these two hot water systems are not suitable for long-term,energy-efficient and stable running for medium and large sized hot water projectsthrough simulation analysis.Secondly, the paper proposed and described the structure, characteristics,working principle, running conditions and control methods of the hybrid solar-groundsource heat pump hot water system, established simulation model of the system.Theoptimization of matching solar collector area with heat pump capacity is the keyissues that affecting the hybrid system’s performance, the paper used the method ofcalculating the cost to analyze, carried out matching simulation study on the hybridsystem and got the optimized matching scheme,then carried out the optimized designstudy of using the underground heat exchanger to store solar heat in summer and gotthe optimum heat storage temperature conditions. Finally, the paper compared the hybrid solar-ground source heat pump hot watersystem with ground source heat pump hot water system and electric auxiliary heatingsolar water system on the analysis of energy-saving, environmental protection andeconomic efficiency. Then calculated the initial investment and annual operating costof different hot water systems, using the comprehensive evaluation index of annualcost to evaluate the economic benefits of three programs, concluded the hybrid solar-ground source heat pump hot water system is the optimal program in economic, andthen calculated the dynamic investment recovery period of using it. |
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