A dynamic model of hollow ventilated interior wall integrated with solar air collector

摘要

The integration of solar air collector with hollow ventilated interior wall (SAC-HVIW) has the potential of reducing heating energy use and improving thermal comfort during nighttime for residential buildings on Tibetan Plateau. Currently, the lack of dynamic model of SAC-HVIW limits its application. In this paper, a dynamic resistance and capacity network model of SAC-HVIW is developed to evaluate the thermal performance. A 3R2C model with resistance and capacity values theoretically identified is used for the modeling of the building, and together with the Number of Transfer Units method for the modeling of HVIW. Meanwhile, dimensionless analysis and numerical simulation are applied to derive the dimensionless equation of thermal performances of SAC. This dynamic model is individually validated by experimental and simulation results, with relatively small errors of SAC air temperature rise, HVIW outlet air temperature and indoor air temperature. The validated model is further used to conduct a case study to evaluate the thermal performance of room with SAC-HVIW in terms of improving the indoor air temperature and the thermal efficiency of SAC. The presented model is beneficial to the design and the application of this integrated system in the future.