environmental conditions for human occupancy specify the combinations of indoor environmental and personal factors that produce acceptable thermal conditions for most occupants within a space (ASHRAE, 2013). Furthermore, assuming slow air movement (less than 12m per minute) and 50% indoor relative humidity, the operative temperatures recommended by ASHRAE range from 20°C to 23°C in the winter, and from 23°C to 26.6°C in the summer. The temperature range is related to the change in clothing depending on the season.
6.5.6 CONCLUSION FROM COMPARISON After comparing the results with the ASHRAE standards, the enclosed heating system proved to be the most efficient as the system was able to discharge heat within the thermal comfort range for 5 hours on average. The ventilated system was only able to discharge heat within the thermal comfort range for 2 hours. After comparing the results from the cooling system, the ventilated system proved to be the most efficient as the system proved to provide cooled air between the range of 23°C and 26.6°C for 12 hours on average compared to the 5 hours of cooled air provided from the enclosed system.
6.6 APPLICATION OF SOLAR HEATING/ COOLING SYSTEM The solar heating system is proposed to be installed on housing units either as a retrofit or as part of a newly built housing unit. For this section, a 24.3m³ (3000mm x 3000mm x 2400m) housing unit will be used as an example. Calculation of rock bed required: 24.3m³ x 0,25m³ (Rock) = 6.075m³ Calculation of solar air heater: 0,5m² x 24.3m³ = 12,15m² The solar air heater can be constructed in separate panels to make up the required size of the panel or constructed in one large panel.
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