Analysis degrees superheating refrigerant R141b on evaporator
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ORIGINAL
Analysis degrees superheating refrigerant R141b on evaporator Muhamad Yunus Abdullah 1,2 & Prabowo 1 & Bambang Sudarmanta 1 Received: 10 December 2019 / Accepted: 15 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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. Keywords Evaporator . Immersed heat exchanger . ORC . Superheating
Nomenclature ŇUD Nusell Number D Diameter (m) h Coefficient Heat Transfer (mw2 K ) m g Acceleration of gravity (s2 ) 1 β Coefficient of convection (°C ) m2 Kinematic viscosity ( s ) α Thermal diffusivity (m2 s ) LMTD Immerseld Head Exchanger Ts Cylinder temperature saturation (°C) T∞ Ambient temperature (storage tank temperature) (°C) Tc our Fluid temperature out (°C) Tcin Inlet fluid temperature (°C) w q"s Flux Heat (m2 ) kJ qs Power ( s )
* Muhamad Yunus Abdullah [email protected] 1
Department of Mechanical Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember Surabaya (ITS), Surabaya, Indonesia
2
Department of Mechanical Engineering, Sekolah Tinggi Teknologi Angkatan Laut (STTAL), Surabaya, Indonesia
Re TH TW G ρ Cp μ Pr T P PS Tf As V hf hg hf
Reynolds number Heating fluid temperature (°C) Wall temperature (°C) kg Flux mass (m2s ) kg Density (m3 ) kJ Specific heat (kgK ) Dynamic water viscosity vapor (Pa.s) Prandll Number Temperature (°C) Pressure (Pa) Saturation Pressure (Pa) Temperature film (°C) Area of cylinder (m2) Velocity (m/s) Enthalpy Sat.Liquid (kJ/kg) Enthalpy Evap (kJ/kg) Enthalpy Sat.Vapor (kJ/kg)
1 Introduction Fluid flow and heat transfer experiments have been done out by researchers before. One of the studies conducted on heat transfer testing is ORC (1–10). ORC system uses water fluid (H2O) as its working fluid already completed in many previous studies. In this experiment replaces on water (H2O) with
Heat Mas
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