Abstract

The research is aimed to determine the appropriate insulated materials and the thickness of insulated boxes for keeping in-box temperature around 70 ^oC. The experiments were conducted by taking amount of 500 g river gravels (number 3) to heat in Hot air oven at 100 ^oC for 24 hours before putting in the 0.027 m³ (30x30x30 cm) insulated boxes. The in-box (T1) and out-box (T2) ambient air temperature were recorded by automatic data locker from beginning to the end of experiments. The relationship between time (t) and in-box temperature by graphical techniques in order to select the appropriate insulated material under the criterions of The King's Royally initiative nature-by-nature process, simplicity technology, and low expense (or local materials using for constructing technology), Also, the relations between Q (heat conduction) of temperature differences (in-box and outside box) in varying time (t) as same as the insulated material thickness was evaluated from graphical products of fixing T1 (equivalent to 70 ^oC) and Q of varying ambient air temperature. The results found that rice straw as the appropriate insulated material tether with the minimum rice-straw insulated thickness of 6 cm in which the in-box temperature could be kept long enough for psychrophiles, mesophiles, thermophiles, and hyper-thermopile to complete the digestion of carbohydrates, proteins, celluloses, hemicelluloses, and fibers. Moreover, the research result was also pointed out the values of ambient air temperature (from -10 ^oC to 70 ^oC) is inversely related to thickness of the rice-straw insulated boxes, by taking the minimum thickness of 6 cm for T2 equivalent to 30 ^oC.

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