Study On The Thermodynamic Behavior And Application Evaluation Of The Integrated Photovoltaics-heat Pump Systems(Air Condition)

The energy consumption is very high although the energy rescouses is rich i n China. The traditional fossil energy resources in China can only meet the requirement for 30 years according to the current energy consumption situation. As the domination industry in the economic structure of our country, the connstruction industry acco unts for more than 1/4 of the total energy consumption. The total number of all kinds of buildings grow exchenmly and the energy consumption is always restricted to a high level for the rapid process of urbanization in China. According to the fourth assessment report of the Intergovernmental Panel on Climate Change（IPCC）, the global warming trend in the last hundred years is largely due to the development of the city. Therefore, the development of the city, the growth of the quantity of the building not only brings the unprecedented energy pressure, also has caused the huge threat to our survival environment. It is urgent to find a substitute for the traditional fossil energy, and to reduce the consumption of building energy consumption. The research shows that the energy consumption of air conditioning and hot water and other construction equipment in the building occupies more than 75% of the whole building energy consumption. It can achieve the purpose of reducing the energy consumption, reducing the CO₂ emissions and protecting the ecological environment by combining the renewable green energy with the construction equipment.However, how to combine the renewable green energy with the building equipment? What are the thermodynamic behavior charactoristics between the renewable energy, the building equipment and the environment ? What kinds of rules should be obeyed when the integrated system is beening design? How to evaluate the integrated system when it is applied? None of theses problems has been solved well at present.The study on the thermodynamic behavior and application evaluation of a kind of PV integrated air-source heat pump systemwas conducted in this article. Specifically, the work were done as follow.（1） The present research on photovoltaic theory and application, heat pump theory and application, and the theory and application of the coupling system were reviewed. The problems still exist have been found out.（2） In order to solve the existed problems, a kind of new concept scheme of air-source heat pump system drived by distributed PVwas proposed in this article. Based on this concept, a set of suitable experimental demonstration system was also been established.（3） To study the thermodynamic behavior of the integrated system, different methods were applied to model the power generation performance of photovoltaic cells（max PV transfer coefficient） in the early stage, and a comparison between them was conducted. Finally, a kind of thermodynamic model based on the dimensionless method was used to model of the photovoltaic cells.（4） Then the thermodynamic models（including exergy consumption model, exergy consumption economic model and CO₂ emission model） of the the PV integrated air-source heat pump system were established based on the above dimensionless model.The related experimental data from the experimental system were used to make validation analysis. It was a good method to describe the thermodynamic behavior charactoristics of the integrated system. The evaluation on the efficacy of the integrated s ystem in central-south China regionwasmade based on the above thermodynamic models. The relavated methodsor rules should be obeyedwhen the integrated system was beening design, were also proposed.（5） In the end, the methods were proposed to calculate the requested amount of the PV power of a sigle building and a whole city at the condition with best thermodynamic performance. The indexes of the potention of PV of a single building and a whole city were introducedrespectively according to the above calculation methods of the requested amount of the PV power of a sigle building and a whole city at the condition with best thermodynamic performance.Finally, the energy-saving evaluation methods of the single building and whole city were built based on the PV potention index.The research results of this article can solve the existed problems mentioned above. The research methods applied in this article can provide a reference for the research, design and application of diferent kinds of integrated system in differen t places, and for the PV application potention and green building evaluation in different cities.