Erhart, Tobias Gabriel and Eicker, Ursula and Infield, David (2013) Influence of condenser conditions on organic rankine cycle load characteristics. Journal of Engineering for Gas Turbines and Power, 135 (4). ISSN 0742-4795Full text not available in this repository. (Request a copy from the Strathclyde author)
A 7 MWth combined heat and power plant (CHP) based on an organic Rankine cycle (ORC) with 5.3 MWth and 1 MWel nominal output is analyzed. A district heating system serves as heat sink; the entire system is heat-led. Two examples for winter and summer operation are shown. The observed characteristics of the condenser are compared to results of a theoretical model. Variable mass flows, temperature levels (72 °C–95 °C) and temperature spreads result in varying condensation temperatures and pressure levels in the condenser (90 mbar to 150 mbar). High mass flows on the secondary side and related low temperature spreads improve the heat transfer and increase the condensation rate in the condenser. The monitoring data support the findings of a steady-state condenser model. As a consequence, advantageous load profiles according to the pressure characteristic of the system can be reached. Live steam pressure, pressure difference across the turbine, and flow rate increase. The effect on the electric efficiency is one percentage point in summer and 1.5 percentage points in winter, which translates to a difference in the electric yield of the cycle of about 10%. Furthermore, the data show that the transient sink conditions cause unsteady operation for the entire cycle.
|Keywords:||condenser conditions, organic, rankine cycle load characteristics, Electrical engineering. Electronics Nuclear engineering, Energy Engineering and Power Technology, Mechanical Engineering, Nuclear Energy and Engineering, Fuel Technology, Aerospace Engineering|
|Subjects:||Technology > Electrical engineering. Electronics Nuclear engineering|
|Department:||Faculty of Engineering > Electronic and Electrical Engineering|
|Depositing user:||Pure Administrator|
|Date Deposited:||20 Jun 2013 10:21|
|Last modified:||24 Mar 2017 08:40|