Research
Effect of Relative Humidity on Oven Temperature of A Locally Design Solar Carbinet Dryer
Abstract - Among other atmospheric factors, relative humidity of the air plays an important role in the drying by solar radiation. The effect of relative humidity over oven temperature was investigated in this work. This study reveals that is a relationship between relative humidity and temperature.From the work done it has been found out that the higher the temperature the lower the relative humidity and hence the faster the drying rate of the material. It was also observed that the time, at which the maximum temperature was obtained, the relative humidity was minimum. Throughout the period of the research the oven temperature was higher than the ambient temperature while the ambient relative humidity is higher than the oven relative humidity.
Appraisal of Wind Energy Potential in Zaria Metropolis
Daily wind speed and directions obtained using wind vane and anemometer for a period of ten years (1995- 2004) were acquired from meteorological station located at longitude 07 o 41′ E and latitude 11o08′ W, altitude of 686 m in Nigerian college of aviation technolog Zaria. The readings were usually taken twice in a day, at 10.00 am and at 4.00 pm. The results showed a relative dominance of N-E. With 7251 direction counts recorded throughout the years N-E windhas3317 direction counts representing 45.75%, S-W 33.4%, N-W, 11.75% S-E 7.94% E, 0.68%; W, 0.30% S, 0.08% and N, 0.07%. The maximum wind speed of 3 m/s was obtained at a height of 10 m above the earth surface. There is an evidence of speed increase with height above the earth surface. The average extractable wind power per unit area wasnot less than 9 w/m2 in the area . It was also observed that dry season (N-E wind period), normally runs from the month of November to February whereas the rainy season (S-W wind period), and runs from the month of May to September.
