Research On Incentive Mechanisms For Green Retrofitting Of Existing Buildings Under The PPP Mode

With the continuous progress of the Chinese economy and technology,the design and construction technology in the field of architecture have rapidly developed.The energy efficiency of new buildings has gradually improved,meeting the current requirements for energy conservation and emission reduction.However,the large stock of existing buildings is often accompanied by high energy consumption and poor indoor environment.In order to promote the achievement of the "dual carbon" goal in the construction industry,effective green retrofitting measures for existing buildings should be taken to reduce their operational energy consumption and carbon emissions.However,due to the self-owned or rented nature of existing buildings,there are problems such as uncertain benefits and long investment payback periods for green retrofitting projects.Financing issues have hindered the scale development of the green retrofitting market for existing buildings.The introduction of the PPP mode in green retrofitting projects for existing buildings can play the role of market entities to drive the development of green retrofitting for existing buildings.However,there are problems such as low investment enthusiasm of social capital and poor profitability in the development process of green retrofitting for existing buildings.Setting up effective incentive mechanisms to encourage social capital to actively participate in PPP projects for green retrofitting of existing buildings is of great significance through government regulation strategies to coordinate the interests of all parties.Firstly,based on the principal-agent theory and the characteristics of PPP projects for green retrofitting of existing buildings,explicit and implicit incentive models were constructed respectively by linking government incentives with the performance output of social capital,and a reputation mechanism was introduced for comparative analysis.The effort level of social capital in the implicit incentive model under the reputation effect was increased,resulting in a good incentive effect for social capital,and the government can obtain higher comprehensive benefits by fully utilizing the implicit incentive effect of the reputation effect and maintaining a stable cooperative relationship with social capital.Secondly,using evolutionary game theory,a threeparty evolutionary game model was constructed,including the government,social capital,and owners.The stability analysis and solution of the evolutionary game system were conducted by constructing the expected revenue functions and replicator dynamics equations for each participating party.MATLAB software was used to simulate the evolution paths of the game entities,and the dynamic evolution paths and stable strategies of the government,social capital,and owners in the green retrofitting market of existing buildings in China were analyzed.Finally,based on the analysis of the game entities and the simulation of the model,an incentive mechanism for green retrofitting of existing buildings under the PPP mode was established,and the basic framework of the incentive mechanism was established.Corresponding incentive policies were formulated for different development stages to construct a full-stage incentive mechanism for green retrofitting of existing buildings under the PPP mode.Targeted measures were proposed to provide a reference for the formulation of relevant policies.