Abstract
In this work, implicit method is used to solve the building heat transfer equations in order to improve the speed and stability of calculation. It only takes 161.906 s to calculate the annual data when the time step is 6 min in the specific calculation example. In addition, the effective heat capacity method is used to independently model the building module containing phase change materials (PCMs), which can accurately simulate the temperature distribution of each node inside PCMs. Therefore, the temperature changes of different nodes in PCM and the utilization efficiency of PCM can be analyzed. Radiative heat transfer in buildings can be considered separately so that it can be distinguished from convective heat transfer. The radiation characteristics of the envelopes can also be modified, which means that smart windows can be studied by changing the radiation characteristics of the transparent envelope. Combined with these calculation characteristics, a software called BuildingEnergy is proposed. At present, the reliability of the software has been proved by ANSI/ASHRAE Standard 140–2001. A set of experimental device was set up in Hefei (China), and through the comparison with the simulation results, it was found that the software has high reliability under both active and passive mode. Moreover, it has a high accuracy in simulating the performance of phase change materials and vanadium dioxide films in buildings.
NSTL
Elsevier