Design and testing of a 340 kW Organic Rankine Cycle system for Low Pressure Saturated Steam heat source

In the current paper, under the condition of different flue gas temperatures and constant flue gas thermal power, the influence of different organic working fluids on the efficiency of sub-critical organic Rankine cycle system were studied. The efficiency and other parameters of the simple system were calculated. The results show that the efficiency of sub-critical organic Rankine cycle system could reach maximum when the parameters of the working fluids in the expander inlet are dry-saturation. Flammability, toxicity, ozone depletion and other factors of the working fluids should be considered in the organic Rankine cycles. R245fa is considered a better choice for low-temperature heat source power generation, and the efficiency of the system is about 10.2%; for the high-temperature heat source, R601a can be considered; however, due to its high flammability, novel working fluids should be further discovered for power generation.

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Analytical Study on Performance of a 250-kW Organic Rankine Cycle System under Off-Design Heat Source Temperatures by the Flow Rate Control Approach

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.764-765.186 ◽

2015 ◽

Vol 764-765 ◽

pp. 186-190

Author(s):

Ben Ran Fu

Keyword(s):

Heat Source ◽

Flow Rate ◽

Rate Control ◽

Organic Rankine Cycle ◽

Rankine Cycle ◽

Working Fluid ◽

Control Approach ◽

Cycle System ◽

Flow Rate Control ◽

Net Power Output

A 250-kW organic Rankine cycle system comprised of a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and operational control strategy by the flow rate control approach of the working fluid R245fa. The net power output was 243 kW, and the system thermal efficiency was 9.5% under design conditions. The analytical results demonstrated that the flow rate of the working fluid increased with increasing the heat source temperature (TW,in); higher TW,in yielded better heat transfer performance of the designed preheater as well as a higher requirement for the evaporator’s heat capacity; and the net power output increased linearly with increasing TW,in.

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Experimental Investigation of a 560 Watt Organic Rankine Cycle System using R134a as Working Fluid and Plat Solar Collector as Heat Source

International Journal of Electrical, Energy and Power System Engineering ◽

10.31258/ijeepse.4.3.169-172 ◽

2021 ◽

Vol 4 (3) ◽

pp. 169-172

Author(s):

Awaludin Martin ◽

Muhammad Nur

Keyword(s):

Energy Source ◽

Solar Energy ◽

Heat Source ◽

Organic Rankine Cycle ◽

Rankine Cycle ◽

Maximum Efficiency ◽

Working Fluid ◽

Energy Sources ◽

Small Scale ◽

Cycle System

New and renewable energy sources such as solar, geothermal, and waste heat are energy sources that can be used as a source of energy for Organic Rankine cycle system because the organic Rankine cycle (ORC) requires heat at low temperatures to be used as energy source. The experimental of Organic Rankine Cycle (ORC) systems with solar energy as a heat source was conduct to investigate a small-scale ORC system with R134a as a working fluid by varying the heat source at temperature 75⁰C-95⁰C. The experiment resulted a maximum efficiency, power of system is 4.30%, and 185.9 Watt, where the temperature of heat source is 95⁰C, the pressure and temperature of steam inlet turbine is 1.38 MPa and 67.9oC respectively. Solar energy as the main energy source in the ORC system can reduce energy use up to 49.9% or 4080.8 kJ where the temperature of the water as the heat source in the evaporator is 51°C.

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