Numerical Simulation For Temperature Control And Energy Saving Of Concrete With Phase Change Materials

Nowadays, the difference has been increasingly enlarged between the need of building comfort and the actual comfort, and it directly leads to that people have to use other facilities to meet their own needs. Consequently, the proportion of building energy consumption is steadily growing in total energy consumption. The application of phase change material(PCM) has become one of the practical solutions for construction, and been extensively discussed and researched. However, because of the limitation of various external environments, the existing research merely focuses on single component or small-sized house, hence the data related to large building are very limited. This paper investigates the actual use effect of PCM for large-scale building under multiple factors, in combination of both experiment and simulation, and it mainly includes as below:(1) Through experimental method to test mechanical properties, thermal performance, and thermostability and thermal reliability after manifold cycles for PCM energy storage concrete, and to monitor and record the effect of thermal regulation in small-sized house model, so as to explore the actual use effect of PCM energy storage concrete.(2) By application of Energy Plus to simulate and compare experimental data, published literature and government data collected, so as to verify reliability of this software when in simulation of PCM, and to make preparation for subsequent performance simulation of PCM in large-scale building.(3) Through simulation method to discover the regulating capability of PCM on temperature inside the building under the influence of various factors, which are mainly phase change temperatures(23?-27?), five climate types, layout location of PCM(three building envelopes), thickness of PCM layer(5mm-20mm) and enthalpy. By multi-angle analysis on the result of simulation to get the law of influence of the PCM on the indoor temperature, so as to design suitable application combination of PCM for practical engineering.(4) Through simulation method, to explore the energy efficienc y of PCM for building energy consumption under the influence of various factors, which are mainly five climate types, layout location of PCM(three building envelopes) and thickness of PCM layer(5mm-20mm). By multi-angle analysis on result attained, to find out the optimal combination of energy-saving effect, and provide guidance s for building energy efficiency design in the future.(5) To more precisely analyze indoor thermal comfort, this paper improves the original PMV equation, and introduces angular coefficient, which considering the distance between the human body and the building envelope, more precisely divides the internal space into different areas, so to explore the influence of PCM on thermal comfort in these areas.