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National electricity needs are always increasing, for that the efficiency of power plants needs to be maintained and expected to be improved. To maintain the efficiency of the power plant, it is necessary to feed water system as a provider of feed water before entering the boiler in good condition and one of the equipment is the High Pressure Heater (HPH). In Paiton Power Plant there are HPH numbers 5.6 and 7. This research aims to compare the efficiency of power plants and the losses caused when pltu operates in hph 7 inservice and outservice conditions. The research method used is a simulation in the simulator room of PLTU PT. PJB UP Paiton 1 & 2. From the data obtained then done calculations. Research produces the efficiency value of PLTU when in HPH 7 inservice condition is 33.40% and when outservice is 29.20%. The need for coal to increase the temperature lost due to HPH 7 outservice amounted to 11.11 Tons / hour, so that the losses caused by the increase in coal flow amounted to Rp 1,204.896.000 per year.

Energy needs in Indonesia are increasing day by day due to population growth and economic growth. To meet the increasing energy needs, it is necessary to develop a variety of alternative energies such as: biomass, solar energy, wind energy, water energy, which are still few that utilize One of the machines that use renewable energy is the Stirling motor. A stirling motor is a type of motor that has an external combustion engine that does not require much maintenance and does not emit a lot of pollutants because it only requires a source of thermal energy to run it. In other words, solar energy can also be utilized. The method developed is the use of solar energy which is concentrated by a parabolic reflector to the hot cylinder of the Stirling engine to convert heat energy into motion energy. The purpose of this study was to determine the effect of variations of several fin dimensions and variations in the number of fins on a displacer with aluminum material. This study uses an experimental method to describe the performance of the stirling engine prototype using various dimensions of cooling fins and variations in the number of fins. The results showed that the gamma stirling engine using 6 fins, and a diameter of 38 mm, showed the best results with a time of 43 minutes with an intensity of solar radiation of 188.2 W/m² to drive the stirling engine with a speed of 189 rpm and a torque of 0.87 N. mm. The difference in temperature produced in the hot cylinder and cold cylinder is 115˚C with a thermal efficiency of 44.13%.

Based on previous research, research on the development of solar distillation models is needed. Development of absorbent plates (absorber) using cast concrete material with fin, wave and flat models as a comparison. The fin and wave absorber plates can expand the surface, thereby increasing the intensity of solar radiation received by the absorber. Cast concrete is a porous material that can absorb sea water and make a thin layer, making it easier for the evaporation process and can improve solar distillation performance In this study using the experimental method. Solar still research by examining the surface of a cast concrete absorber plate. The surface of the absorbent plate used is the fin, wave and flat / conventional models. Cast concrete uses stone, iron sand, PCC cement and water. The study used variations in water volume The research resulted in the surface shape of the fin model can increase the productivity of fresh water and the efficiency of solar still using a plate absorbent fin model is higher than the wave and flat models. A smaller volume of sea water can increase productivity higher than a larger volume of sea water.