A Comparison on the Use of different working fluids in an Application of Tesla Turbine and Centrifugal Turbine in Organic Rankine Cycle

ABSTRACT This paper aims to compare the use of Isopentane, Refrigerant 22 (R22) and Refrigerant 134a (R134a) as working fluid expanding in an application of Tasla turbine and Centrifugal Turbine in Organic Rankine Cycle (ORC). The working fluid has fixed point below boiling water and works in low-temperature sources between 80-120 °C which can be produced from waste heat, solar-thermal energy and geothermal energy etc. The experiment on ORC using Tesla turbine and Centrifugal Turbine reveals that the suitability of high pressure pump for working fluid has result on the efficiency of work. In addition, Thermodynamics theory on P-h diagram also presents the effect of heat sources’ temperature and flow rate on any work. Thus, the study and design on ORC machine has to concern mainly on pressure pump, flow rate and optimized temperature. Result of experiment and calculation of ORC using Isopentane efficiency is  30% better than R22 and R134a estimate. Result experiment and calculate ORC Machine using centrifugal Turbine efficiency is better than Tesla turbine 28% but Tesla Turbine is much cheaper and easily structure. Further study on the machine can be developed throughout the county due to its low cost and efficiency. The Tesla Turbine is cheaper and easily structure than other turbines which can be applicable on Organic Rankine Cycle Machine. Further study on the machine can be developed throughout the county due to its low cost and efficiency.