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Nuclear reactors are one of the long-term energy fulfillment solutions. Efforts to increase operating power density at various type of nuclear reactors are programs that are being developed to improve the economic properties of a reactor. The use of nanofluids allows nuclear reactors to operate more optimally through increased critical heat flux (CHF) and increased retention capability of nuclear reactors to accidents. Thermal conductivity is a nanofluids property that intensively studied because it has not been obtained an accurate model. In this paper a nanofluid thermal conductivity model was developed by involving all possible heat transfer mechanisms. But the modification only focuses on the mechanism of nanoconvection. According to this model the thermal conductivity of nanofluids depends on the volume fraction of nanoparticles, particle diameter, viscosity, density, and temperature.

This research was conducted to design public street lighting photovoltaic, based on SNI 7391:2008 concerning specifications of public street lighting in urban areas with several parameters that were considered by poles, lights used, intensity of light needed, number of lights needed and supporting equipment for public street lighting photovoltaic. Currently, Jenderal Sudirman road in the city of Pangkalpinang along 1.5 km uses electricity from PLN with 30 units of 150 watt SON lamps and 11 lux light intensity. The design obtained for street lighting photovoltaic while still meet SNI for light intensity, obtained supporting equipment for solar street lighting, namely 31 unit of 8 meter octagonal poles with specifications of 40 watt LED lights for each cross arm, 1 unit of 100 Wp solar panels, unit of 100 Ah VRLA batteries and 1 unit of solar charger controller (10A, 12V / 24V).

Batik cual is one of the leading textile products in the Bangka Belitung Islands. In their production processes resulted dye pollutan in wastewater. Most batik cual industries use synthetic dyes such as remazol brilliant blue royal which can damage the environment if discharge without further treatment. Electrocoagulation is a method that can be used as a first step in processing batik cual wastewater. In this paper, we analyze the relationship between the number of aluminium electrodes used in the electrocoagulation process and the quality of the water produced and the energy used. Wastewater quality parameters observed included pH level, number of dissolved particles, conductivity level and turbidity. Through this comparison, it can be obtained information related to the key parameters of electrocoagulation to increase its efficiency. The optimum result obtained when using six electrodes in the electrocoagulation process.

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