Anallsis Energi dan Sebaran Suhu pada Gasifier Unggun Tetap

Performance test of Imbert Downdraft Gesifier by using cyclone as an auxiliary for tar filtering has been conducted with three kinds of feeding chips, i. e; borneo wood, tamarind wood and leucena wood. The research has been developed to support as an energy source for combined heat power generation. Gesifier will be coupled to diesel generating set and waste heat from the exhaust gas will be used as energy source for an adsorption type refrigeration system. The test had produced the best combustible gas with the chemical composition CO = 55,59 %, CH4 = 0,14 %, C2H6 = 0,3 % and C3H8= 0, 08 %. The maximum temperature 1142 oC has been found in oxidation zone based on the leucena wood test, meanwhile the calculation result of energy availability for the combustible gas was 60,39 kW and specific energy availability was 0,082 kg/kWh. The test result of temperature distribution along the reactor compare to numerical solution of mathemathicai modelling has got the similar curve. Diterima: 26 Pebruari 2007, Disetujui: 25 Mei 200

Analisis Sistem Heat Pump Kompresi Uap untuk Pengeringan Gabah

As a drying system, heat pump drying with appropriate configuration is potential to safe energy. The objective of this research was to develop vapor compression heat pump system for rough rice drying and to obtain low energy consumption from several system configurations. Therefore, the model of vapor compression heat pump system was designed in which its configuration was modifiable. The result showed that the ratio of specific moisture extraction rate which calculated mechanic and thermal consumption (SMERTot) upon resistive heating dryer for those several configurations was 159 – 329%. The open cycle heat pump drying method with intermittent operation produced the highest specific moisture extraction rate which only calculated thermal energy (SMERT) and SMERTot at 7.06 and 5.06 kg/kWh, respectively. Intermittent operation did not much influence drying rate but significantly reduced energy consumption. Ambient air inlet which placed before evaporator and condenser on a closed cycle could produce different SMERTot i.e. 4.01 dan 3.07 kg/kWh respectively. The utilization of ambient air through forced convection in heat exchanger could increase SMERTot, while the utilization of air flow the dryer from outlet could reduce SMERTot