The mechanism of the drying process is the process of heat transfer and mass transfer that takes place simultaneously. The pressure of the water vapor in the acid gelugur is higher than that on the surface interface of the gums and air acids. Intensity solar radiation averages around 300-590w / m2 and Ambient Temperature 28,830C. The hot air condition in the drying box averages 320C. The content of total citric acid gelugur acid was 1.2787% with 3mm slice thickness and 1.3981% with a 5mm slice thickness. Drying is done from 08.00-17.00 am with a hot air flow rate of 1.5m/s.
The use of agricultural solid waste is one alternative source of energy substitutes, generally made into charcoal briquettes. In making charcoal briquettes, binder is needed to bind charcoal particles. In this study used vehicle lubricating oil was used as an alternative binder. Charcoal briquettes 600 mesh from corn cobs and coconut shell waste are made on the composition of raw materials of 75% corn coke charcoal, 25% coconut shell charcoal with a total weight of 100 grams. In each mixture, SAE 40 used lubricating oil was given with variations of 5 ml, 10 ml and 20 ml. Then each raw material weighing 16 grams was put into a mold measuring 2.2 cm in diameter and 6.33 cm high and pressurized by using a hydraulic press for 15 minutes until the briquette was formed. The results of the study showed that adding 20 ml of used lubricating oil gave the best characteristics of charcoal briquettes.
One of the sources of electricity technology is solar cell. in principle solar cell converts solar energy into electrical energy, here a simple solar cell made of copper that is designed simply with copper material containing oxide is made into the negative side of the solar cell and positive as a copper palat which does not contain oxide / is not baked on electric stove in the design of this simple solar cell where the copper cross section area containing oxide with a size of 25cm x 30cm and the size of copper plate that does not contain oxide with U-shaped is 29cm x 32cm and coated with glass as a reflector with a size of 32cm x 34cm where in solar design This simple cell was conducted for 2 days during a solar cell experiment for 2 days with the highest voltage of 4.4 V, which is on the first day and the voltage on the second day gets the highest voltage of 4.0 V with the intensity different light.
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