Today lots of research and application of solar heating are focused on continuously occupied buildings, such as residential buildings. This paper studies solar heating for intermittently occupied buildings such as offices, classrooms, workshops which generally are unoccupied during nights and weekends. If we stop space heating during nights, energy for space heating will be reduced. In the paper, a simple building is assumed and a solar assisted space heating system is designed for it. Hourly simulations during the whole winter are conducted under various conditions, such as different building envelopes, different control strategies and so on. The results show that whether stopping heating during nights in solar heating buildings can save conventional auxiliary energy compared to continuous heating depends on the control strategies and types of envelopes.
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