Effects Of Solar Control (a Case Study Of Domitory Buildings In Mautech)

ABSTRACT
Buildings supposed to shield their occupant from the perturbing solar radiation which especially in the hot dry climate of Yola pose problems of high indoor temperatures, thermal and visual discomfort among others. But to what extend does the Architectural solar control measures viz; shading, building orientation with respect to cardinal direction, and design or planning affect cooling. The current study examined effect of exploiting these strategies on passive cooling in dormitory buildings in MAUTECH with the aim of enhancing passive cooling through solar control. The study is a Case Study research and the unit is dormitory buildings in MAUTECH from which sample was drawn (the 5 hostel) for the purpose of the study. six rooms were chosen Purposively from each of 4 building purposively selected from the deliberately chosen Kabir Umar Hostel; oriented to N/S and E/W with and without vegetation in their courtyard that are identical in all parameters such as; area, geometry, windows design, glazing area and transmittance and from them the necessary Quantitative data was obtained Using Testo 405 thermal anemometer and the readings for air temperature and air speed was observed for indoor, outdoor and courtyard of the 24 and also of the hostel common room at morning, afternoon, and evening for 14days. The collected data was presented and analyze statistically by calculating the mean and standard deviation and reduction in % for each rooms and compared and from there conclusions was drawn.  The results showed that the reduction in heat gain varies with time of day and the temperature of rooms in building oriented N/S with vegetation compared to that of E/W without vegetation is reduced significantly and that orientation with respect to cardinal direction does not affect the mean ventilation coefficient. At the time of measurements, it was also revealed that the effectiveness of the hostel design in term of passive cooling doesn’t meet the required level hence recommended for retrofitting by insulating external wall and roof, increase sizes of window openings, etc.