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Analysis degrees superheating refrigerant R141b on evaporator

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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.

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Abbreviations

Ň UD :

Nusell Number

D:

Diameter (m)

h:

Coefficient Heat Transfer (\(\frac{w}{m^2K}\))

g:

Acceleration of gravity (\(\frac{m}{s2}\))

β:

Coefficient of convection (\(\frac{1}{{}^{\circ}C}\))

:

Kinematic viscosity (\(\frac{m2}{s}\))

α :

Thermal diffusivity (\(\frac{m2}{s}\))

LMTD:

Immerseld Head Exchanger

T s :

Cylinder temperature saturation (°C)

T ∞ :

Ambient temperature (storage tank temperature) (°C)

T c :

our Fluid temperature out (°C)

T cin:

Inlet fluid temperature (°C)

q"s :

Flux Heat (\(\frac{w}{m2}\))

q s :

Power (\(\frac{kJ}{s}\))

Re:

Reynolds number

T H :

Heating fluid temperature (°C)

T W :

Wall temperature (°C)

G:

Flux mass (\(\frac{kg}{m2s}\))

ρ :

Density (\(\frac{kg}{m3}\))

Cp:

Specific heat (\(\frac{kJ}{kgK}\))

μ :

Dynamic water viscosity vapor (Pa.s)

Pr:

Prandll Number

T:

Temperature (°C)

P :

Pressure (Pa)

P S :

Saturation Pressure (Pa)

T f :

Temperature film (°C)

As:

Area of cylinder (m2)

V:

Velocity (m/s)

h f :

Enthalpy Sat.Liquid (kJ/kg)

h g :

Enthalpy Evap (kJ/kg)

h f :

Enthalpy Sat.Vapor (kJ/kg)

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Acknowledgments

This experiment powered by Lembaga Pengolahan Dana Pendidikan (LPDP), the Kementrian Riset Teknologi dan Pendidikan Tinggi (RISTEKDIKTI), and Dinas Pendidikan Angkatan Laut (DISDIKAL) to support finance. Prof. DR. Ir.Eng Prabowo, M.Eng as a promoter and DR Bambang Sudarmanta, ST, MT as co-promoter. Also for the Engineering, and Combustion and Fuel Engineering Department, the laboratory team of the Institut Teknologi Sepuluh Nopember (ITS) and the Sekolah Tinggi Teknologi Angkatan Laut (STTAL), Surabaya Indonesia which provides facilities to support this research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember Surabaya (ITS), Surabaya, Indonesia

    Muhamad Yunus Abdullah,  Prabowo & Bambang Sudarmanta

  2. Department of Mechanical Engineering, Sekolah Tinggi Teknologi Angkatan Laut (STTAL), Surabaya, Indonesia

    Muhamad Yunus Abdullah

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  1. Muhamad Yunus Abdullah
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  2. Prabowo
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  3. Bambang Sudarmanta
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Correspondence to Muhamad Yunus Abdullah.

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Abdullah, M.Y., Prabowo & Sudarmanta, B. Analysis degrees superheating refrigerant R141b on evaporator. Heat Mass Transfer 57, 829–841 (2021). https://doi.org/10.1007/s00231-020-02963-1

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