Design and Research on a Heating System with Energy Storage by Pebble-bed in a Passive Solar House

摘要

This paper focuses on the optimum design and operating performance of a pebble-bed energy storage heating system in a passive solar house.To study the characteristics of the heating system, a numerical model for this system is presented and is validated by the experiment data in the literature.Based on the model, the influence of the envelopes of the solar house and the meteorological condition on the system performance is investigated.The results show that the envelopes except the north face with more glazed exterior surfaces can be beneficial to raise the temperature of the solar house.It is found that outdoor temperature may have less impact on the energy stored in the system compared with solar radiation.Furthermore, through optimizing the system design and operation, the solar energy can account for 56％ of the energy requirement in the heating season in Xi'an.Also the suitability of the system in Northwest China is investigated, the outcome demonstrates the external comprehensive temperature should be more than 268K, if 50％ energy saving rate is expected.