THERMAL LAG PERFORMANCE OF A MOBILE DOUBLE WALLED SAWDUST INSULATED METALLIC SILO
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Date
2016-09
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Abstract
A 1000 kg double walled insulated mobile metallic silo was designed and constructed with two mild sheets of 1mm
thickness using sawdust as an insulating material between the metal sheets. The silo has a total height of 1.2m
above the ground level with an internal and external diameter of 0.64 m and 0.68 m respectively and resting on a
platform which has four wheels attached to it for mobility. A preloading assessment was conducted on the silo to
determine the possibility of using sawdust as an insulator in the silo. Comparison was also made between the
single walled aluminium sheet silo placed on a platform and the double walled insulated mobile metallic silo to
determine thermal performance. Temperature readings were taken 3 times for each time interval for 10 days using
a therma waterproof K thermocouple model 232-101. The result showed that the temperature reading was usually
low by 8:30am within the double walled silo having a least temperature of 23.90C, while the highest temperature
for double walled silo was at 12:30pm with 33.60C and the result also showed that the temperature reading was
usually low by 8:30am within the single walled silo having a least temperature of 25.20C while highest
temperature for single walled silo was at 12:30pm having a range of 36.60C. The double walled mobile metallic
silo moved smoothly on a flat untilled road by pushing without a jolting action and undulating movement. In
conclusion, the double walled mobile metallic silo performed better than the single walled silo and has a good
thermal property which is suitable for the storage of grains in tropical region for low income farmer.
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Keywords
Double walled, temperature, thermal time lag, metallic, silo, mobile, Nigeria