Energy of water is one of the renewable energy that can be converted into electrical energy without pollution. Rotation, torque, and power generated by the water wheel can be used directly both for irrigation pumping and for running a rice mill even move the alternator and electrical generators. The purpose of this study was to find the best water wheel performance indicated by torque, rotation, and power as well as the relative speed of the water at the side of the blade. The results obtained in the preliminary test were the average water velocity of 2.50 m/s, the average rotation shaft of 79.78 rpm, the average torque on the shaft of 58.98 Nm, the average power of 510,67 W. The second results were also obtained as given the results and discussion section. It was found that the best water wheel performance based on the analysis was shown in the second test results.

This study aims to: (1) make briquettes from rice husk and straw with some mixture proportions, (2) determine the heating value (HHV) and the compressive strength of the produced briquettes (3) determine the physical properties of the produced briquettes through the proximate analysis and determine the best briquettes mixture, and (4) know the possibility of using rice husk and straw as briquette fuel for steam boilers. The produced briquettes contained 85% of rice husk charcoal and straw, and adhesive subtance consisting of clay (10%) and strach (5%). The briquettes were made with five mixture proportions with an average mass ratio of 260 gramsduce briquettes briquette type E as the best. The examination of heating value reveals that the higher the percentage of staw in the mixture, the lower the briquette heating value will be; while the testing of compressive strength reveals that the higher the percentage of straw in the mixture, the higher the briquette compressive strength will be. Based on the proximate analysis, it is found that generally the produced briquettes have fulfilled the briquette standard quality. The results of calculations analysis reveal that there is a possibility to use briquettes made of rice husks and straw as steam boilers the ratio between the fuel mass flow rate and vapor mass flow rate is 0.231.