Solar Facade Module for Nearly Zero Energy Building. Extended Test Period

The study presented in this paper is a continued research of preceding tests of small-scale passive solar wall module to explore 1) the behaviour of solar wall module in various setups for an extended 48-hour period of time, and 2) the performance of solar module with and without fine metal wires as heat exchange enhancers. Eight different solar wall module setups were assembled and tested in a precisely controlled environment. The study reassures observations and conclusions made in previous research and provides new conclusions. Modules that can harvest more solar radiation in the charging phase are exposed to higher heat losses at the discharge phase to the external environment. Module setups that reach stable heat flow fast and respectively melt PCM volume effectively, create a problem of not managing to harvest more of the available solar radiation.