Evaluation And Optimization Analysis For Phase Change Energy Storage Materials Utilized In Buildings

Nowadays,with the serious contradiction between people's urgent demand for building comfort and increasingly tight energy supply,as well as the the deterioration of environment,green building as new conception and related technology research,development and promotion were gradually taken seriously.Reasonable application of phase change material(PCM)with good heat storage performance was expected to improve this problem.Most of the existing researches about PCM only focus on the material performance and simple application effect,which was limited in scientific significance and practical engineering as lack of the corresponding application on large&medium-sized buildings and reasonable economic analysis.Based on the principle of phase change energy storage,1-D walls heat transfer equations and room heat balance equations,this paper systematically revealed the thermal performance and energy efficiency of PCM utilized in buildings through material testing,model experiments and numerical simulation methods,analyzed the mechanism of PCM thermal performance and energy efficiency differences influenced by material characteristics,layout schemes and external disturbances,built a multivariate evaluation model based on material thermal parameters,heat transfer performances of constructions and the application effects of PCM utilized in buildings,proposed a PCM life cycle cost evaluation methodology with multi-objective based on the energy external costs.This paper filled the data gaps of the present researchs about PCM application,and provided some guidances for PCM application and promotion.The main research contents included as follows:(1)This paper used DSC,TGA and thermal cycling experiment to test material mechanical properties,thermal performances,thermostability and thermal reliability for PCM to explore the practicability and applicability of PCM utilized in buildings.(2)By application of wall-model experiment and finite element analysis method,this paper revealed the thermal performances and heat transfer rules to verify the feasibility and application of PCM and PCM components.(3)Adopted the combination of model experiments and numerical simulation methods for multi-factor optimization analysis for PCM functional performance to explore the influence of multiple factors to PCM application effect,such as material properties,layout schemes,and external disturbances for the optimal schemes,so as to provide guidances for building energy saving design.(4)To more precisely evaluate PCM energy-saving potential and economic benefits,dynamic life cycle cost(LCC)analysis model was taken in this paper.The concept of energy consumption external costs were introduced in LCC analysis for the first time,for better analysising,evaluating and optimizing PCM application in buildings from the perspective of the whole social economic development and environmental protection.