EVAPORATOR DESIGN ON A 1 KW ORGANIC RANKINE CYCLE POWER PLANT

• Main Author: Zuldhian, Tegar
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/86340
• Institution: Institut Teknologi Bandung

The Organic Rankine Cycle (ORC) is a thermodynamic cycle that can operate at relatively low temperatures compared to the Rankine cycle, making it suitable for generating electricity using low-grade heat sources, such as waste heat from other thermodynamic cycles or other heat sources. An evaporator is a type of heat exchanger that functions to produce steam. The steam generated by the evaporator can be used as the working fluid to drive an ORC turbine. This research focused on the design of evaporator shell and tube heat exchanger for a 1 kW ORC power plant using R-245fa as the working fluid. The flow rate of the working fluid in the cycle was 0.3 kg/s, with the evaporator inlet conditions at 67 ºC and pressure of 730 kPa in the liquid phase. The Kern method was used to obtain the initial design of the evaporator. This initial design was then used as the basis for designing a standard TEMA evaporator using ASPEN HYSYS software. Subsequently, the ASPEN evaporator design wasnumerically simulated using ANSYS Fluent software to evaluate the evaporator's performance in producing steam. The evaporator design in this study consists of copper tubes with a diameter of 1 inch (25.4 mm) and a length of 3048 mm, arranged in a 90° - square tube pattern and a K-type (kettle) shell with a diameter of 438.15 mm with an overall heat transfer coefficient (Uoverall) of 67,8 W/m2K. The results of ANSYS Fluent simulation showed that the working fluid undergoes a phase change from liquid to vapor during the operating time of the evaporator.