Indonesia is country that owns large enough source of geothermal energy. One effort can be done by utilizing geothermal energy as source for electrical energy generation. To produce a source of electrical energy using ORC using water (H₂O) as a working fluid. In this research ORC system uses Refrigerant R-141b as a work fluid for water experiment (H₂O) used at Rankine cycle at general. There are 4 (four) main component ORC system namely Turbines, Condensers, Evaporators, and pumps. This experiment focused on Evaporator because it produces degrees superheating as energy source. Superheating steam is produced by Evaporator to turn Turbines and generators. Effect of degrees superheating phase change from liquid to vapor by analyzing Heat Transfer Coefficient. The filled evaporator is heated using a burner at temperature 105 °C,100 °C, 95 °C, and 90 °C. From result of experiments with increasing temperature, hot at same time temperature will increase Coefficient heat transfer and can produce higher heat. Changes in degrees heat from liquid to vapor phase become visible from simulation results. Refrigerant R-141b as a work fluid because of it volatile at low temperatures (T < 150 °C) and utilizes waste heat with low enthalpy.

印度尼西亚是拥有足够大地热能源来源的国家。通过利用地热能作为产生电能的来源，可以做出一种努力。使用水（H ₂ O）作为工作流体，使用ORC产生电能。在本研究中，ORC系统使用制冷剂R-141b作为水实验的工作流体（H ₂O）通常用于兰金循环。有4（四）个主要组成的ORC系统，即涡轮机，冷凝器，蒸发器和泵。该实验着重于蒸发器，因为它产生度过热作为能源。蒸发器产生过热蒸汽，从而使涡轮机和发电机转动。通过分析传热系数，研究了过热度从液体到蒸汽的相变的影响。使用燃烧器在105°C，100°C，95°C和90°C的温度下加热填充的蒸发器。根据温度升高的实验结果，同时加热会增加系数传热并产生更高的热量。从液相到气相的热度变化可以从模拟结果中看出。由于制冷剂R-141b在低温下易挥发（T <