6.1.4 CONCLUSION The ventilated experiment concludes that the system requires human intervention after the solar energy is not available from 16:00 pm. The system needs to be closed from 16:00 pm till 8:00 to limit the heat loss from the rock bed heat collector. Smaller rocks or gravel can be used during the same experiment to heat the core of the rock faster, which will also increase the heat loss rate of the rocks. The study will test the heat storage capacity of the rocks utilised in part 1 of the full experiment, further in part 2 by testing the possibility of seasonal charging to heat the core of the rocks and not only the surface. 6.2 FULL EXPERIMENT - PART 2: ENCLOSED HEATING SYSTEM 6.2.1 INTRODUCTION The enclosed system will focus on the heating system’s performance by circulating the air through the solar heating system and rock bed heat collector to limit the amount of heat loss. The system will not be able to provide fresh air into the interior space/ room. Figure 57 illustrates the typical diagram of the enclosed heating system. The air within the solar heating system continues to recirculate through the system, which will heat the already heated air through the solar energy from the solar air heater.
Figure 57: Diagram of enclosed heating system
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