Green Village (KRL) is one of the programs to realize Bogor Green and Clean Regency. KRL Berani Asri RW 15 Cileungsi Kidul was formed to carry out the production, management and utilization independently. Has several problems such as environmentally friendly awareness, not yet optimal waste management, the economic potential of organic and non-organic waste. P2M Mechanical Engineering Study Program IT PLN aims to provide alternative solutions so that KRL Berani Asri is independent in waste management. The method of implementation is socialization, training on waste management, composting, and making plastic chopper machines. The results of the P2M are 67.8% of resident have knowledge about waste management, 61.7% have good waste management behaviour, and 53.8% of residents say that KRL Berani Asri does not yet have waste management infrastructure. The use of appropriate technology has an impact on increasing compost production from 50 bags to 200 bags per week, and the production of plastic that has been sold from 10 kg to 100 kg per week

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Abstract. Global warming is the result of the use of Chloro Fluoro Carbon (CFC) and Hydro Flouro Carbon (HFC) refrigerants. CFC and HFC refrigerants are not environmentally friendly in air conditioning systems. Researchers conducting the research to find an alternative refrigerant with hydrocarbon and the use of liquid suction heat exchanger (LSHX) subcooling in the vapor compression refrigeration system. One kind of LSHX is heat exchanger between tube to tube. Retrofit refrigerant is used to find a replacement refrigerant for R22, R134a, R404A with R600, and mixture refrigerant R290/R600a in the ratio 50:50. From the analysis are conclude that the increases of degree of subcooling temperature significantly affects to the effectiveness of LSHX, increase the refrigeration capacity and also refrigeration capacity index, increase the compressor of work, compressor work of index, COP and COP index. The parameters of the indicators that mixture the refrigerant R290/R600a in the ratio of 50:50 can be used as a substitution for R404A and R22, while the R600 refrigerant can be used as a substitution for R134a in the vapor compression refrigeration system with LSHX.

Gasification process is strongly influenced by the gasifier reactor to produce syngas. This study aims to design and make an updraft type of gasifier reactor without blower so that it does not require electric power in its operation, but use power from engine suction. This gasifier design is suitable for small scale power plants which are not connected to the main electricity network (off-grid system) in rural and remote areas. Materials used in manufacturing the gasifier reactor are consist of type 304 3 mm stainless steel, 3 mm diameter of stainless steel pipe, 3 mm iron plate, and fire cement. The experiment and test results show that the highest efficient and the most optimal biomass in the gasification process is coconut shell charcoal, because coconut shell charcoal has a dense structure and at the time of the experiment, coconut shell charcoal was filled 15 cm below the gas outlet pipe hole. From the economic value of the gasifier reactor that has been produced, the lowest cost result is diesel with EFB charcoal, because in this experiment EFB is the biomass that is not purchased. The additional use of empty bunches of charcoal is able to save 50% diesel usage