TRANSFORMASI ENERGI CAHAYA MATAHARI MENJADI ENERGI TERMAL PADA BAHAN PASIR, TANAH, DAN BATA MERAH

Abstract

Energi alternative very require to handle crisis of energi. One of the source of energi alternative is solar energy. Energy of sunshine can be turned into thermal energy. Observation early yielding the fact that sand, red brick and soil experience of change of temperature after getting irradiating during selected a time gap. Estimated there is relation between change of temperature absorber with accepted light intensity during a time gap. This eksperimen use solar system of energy simple aim to get profile of transformation light energy of sun become thermal energy able to be permeated by sand materials, red brick and soil. Profile of transformation got from third absorber that is sand, red brick and soil with made box of fairish wood 20 x 10 x 10 cm arranged in layers by sterofoam and alumunium foil. Used system that is closed and opened system (by and without fiberglass) getting sunshine directly and reside in in room. Change of light intensity and temperature perceived during 4,5 hour outside and in room with perception each 15 minute during 6 day. Perception closed system executed on 12 - 14 August 2008 while open system on 15, 16, 18 August 2008. Research result indicate that happened increase of temperature during absorber get direct sunshine and absorber can maintain energy till selected time interval before finally is equal to ambient temperature. Sand earn solar energy become compared to bigger energy thermal red brick and soil. Red brick have ability maintain compared to higher energy both other materials. Factor influencing is difference of specific heat capacity , thermal conductivity and type of materials. Result specific heat capacity of sand type equal to 1744,2 J /kg K, soil 1423,5 J /kg K and red brick 975,5 J /kg K. Value specific haet capcity sand bigger that is 0,1756 W /m K, while soil 0,1343 W /m K, red brick 0,0921 W /m K. Excelsior materials thermal conductivity hence progressively lower ability of materials of saved energy.