DESIGN OF RADIAL INFLOW TURBINE FOR 1 KW ORGANIC RANKINE CYCLE SYSTEM USING R-245FA AS WORKING FLUID
Organic Rankine Cycle (ORC) is a reliable technology to utilize low and medium thermal energy and has been on development since beginning of 19th century and has rapid development since last few decades. There are couple of ways to optimize ORC, and one of them is to develop an optimized turboexp...
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| Format: | Theses |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/52300 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Organic Rankine Cycle (ORC) is a reliable technology to utilize low and medium
thermal energy and has been on development since beginning of 19th century and
has rapid development since last few decades. There are couple of ways to optimize
ORC, and one of them is to develop an optimized turboexpander.
This thesis will explain in detail the preliminary and detailed design approached
used to design turboexpander for 1 kW ORC with R-245fa as working fluid. The
initial mass flow of working fluid used is 0,3 kg/s with Inlet pressure of 730 kPa
and Outlet of 560 kPa. The inlet temperature of working fluid is 368,87 K. The
designed geometry was transformed into 3D model using CAD software. The
numerical simulation was performed using ANSYS CFX with SST K-? turbulence
model, and Aungier Redlich-Kwong Equation of state to predict the material
properties.
CFD result shown that highest specific power output produced at 16 blades with
20.000 rpm for 998,54 Watt with total to total isentropic efficiency of 78,54%. The
initial designed configuration was not able to obtain the minimum requirement of
1 kW power generation, thus further analysis using different configuration were
needed. The further analysis showing that the highest efficiency achieved with the
configuration of 0,32 kg/s of working fluid mass flow, 16 rotor blade, and rotation
speed of 20.000 rpm. The off design parameter of designed turbine produced power
of 1.382,3 W with total to total isentropic efficiency of 76,44%.
The thesis will also discuss the possible method to produce designed turbine,
material, and additional component used. The designed turbine will use BLDC
motor to replace permanent magnet generator as the generator for 1 kW and 20.000
rpm is hard to obtain in the market. A replica with 1:1 scale was produced using
PLA as material for 3D printing. |
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