Analysis and optimization of the low-temperature solar organic Rankine cycle (ORC)

Delgado-Torres, Agustín M.; Garcı́a-Rodrı́guez, Lourdes

doi:10.1016/j.enconman.2010.06.022

Cited by 343 publications

(91 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although there have been many studies concerning the effect of a number of system parameters on the ORC system performance [2,5,9,[13][14][15][16][17][18], a detailed analysis of the effect of the heat source conditions on the heat transfer characteristics and system performance has rarely been performed. In this work, an analysis study of the heat transfer characteristics and system performance of a 250 kW ORC system at off-design heat source flow rates was conducted by the pressure control approach, i.e., changing the evaporating pressure to meet the particular system requirements when the heat source flow rate varies from the design value.…”

Section: Introductionmentioning

confidence: 99%

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Liu

2014

Proceedings of 1st International E-Conference on Energies

View full text Add to dashboard Cite

An organic Rankine cycle system with a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and operational control strategy. R245fa was used as a working fluid. The net power output is 243 kW and the system thermal efficiency is 9.5% under the design conditions. For an off-design heat source flow rate (m W ), the operating pressure was controlled to meet the condition that the R245fa reached the saturation liquid and vapor states at the outlet of the preheater and evaporator, respectively. The analytical results demonstrated that the operating pressure increased with increasing m W ; a higher m W yielded better heat transfer performance of the preheater and required a smaller evaporator heat capacity; and the net power output and system thermal efficiency increased with increasing m W . The net power output increased by 64.0% while the total heat transfer rate increased by only 9.2% for the studied range of m W . To conclude, an off-design operation is studied for a heat source flow rate which varied from -39.0% to +78.0% from the designed rate, resulting in -29.2% to +16.0% and -25.3% to +12.6% variations in the net power output and system thermal efficiency, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Liu

2014

Proceedings of 1st International E-Conference on Energies

View full text Add to dashboard Cite

show abstract

“…This omnipresence and feasibility of utilization in small-scale power cycles promote decentralized applications of these energy sources. The organic Rankine cycle (ORC) is one of the promising cycles used to extract thermal energy from various energy sources such as solar, biomass and geothermal [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of a binary geothermal power plant

Ghasemi

Paci

Tizzanini

et al. 2013

Energy

View full text Add to dashboard Cite

6A model is developed for an existing organic Rankine cycle (ORC) utilizing a low temperature geothermal source. The model is implemented in Aspen Plus ® and used to simulate the performance of the existing ORC equipped with an air-cooled condensation system. The model includes all the actual characteristics of the components. The model is validated by approximately 5000 measured data in a wide range of ambient temperatures. The net power output of the system is maximized. The results suggest different optimal operation strategies based on the ambient temperature. Existing literature claims that no superheat is optimal for maximum performance of the system; this is confirmed only for low ambient temperatures. For moderate ambient temperatures (T amb ≥ 1.7 ) superheat maximizes net power output of the system. The value of the optimal superheat increases with increasing ambient temperature.The optimal operation boosts the total power produced in a year by 9%. In addition, a simpler and semi-analytic model is developed that enables very quick optimization of the operation of the cycle. Based on the pinch condition at the condenser, a simple explicit formula is derived that predicts the outlet pressure of the turbine as a function of mass flow rate of working fluid.

show abstract

“…The use of solar energy as the heat source for the ORC unit is the most investigated field. Delgado-Torres and Garcia-Rodriguez [23] performed an analysis and optimization of a low-temperature solar organic Rankine cycle. The optimization has been done taking the net overall efficiency of the solar power cycle as the objective function while the top temperatures of the solar cycle are considered up to 150°C using four different solar collector models.…”

Section: Introductionmentioning

confidence: 99%

Biogas Engine Waste Heat Recovery Using Organic Rankine Cycle

Benato

Macor

2017

Energies

View full text Add to dashboard Cite

Abstract:Italy is a leading country in the biogas sector. Energy crops and manure are converted into biogas using anaerobic digestion and, then, into electricity using internal combustion engines (ICEs). Therefore, there is an urgent need for improving the efficiency of these engines taking the real operation into account. To this purpose, in the present work, the organic Rankine cycle (ORC) technology is used to recover the waste heat contained in the exhaust gases of a 1 MW el biogas engine. The ICE behavior being affected by the biogas characteristics, the ORC unit is designed, firstly, using the ICE nameplate data and, then, with data measured during a one-year monitoring activity. The optimum fluid and the plant configuration are selected in both cases using an "in-house" optimization tool. The optimization goal is the maximization of the net electric power while the working fluid is selected among 115 pure fluids and their mixtures. Results show that a recuperative ORC designed using real data guarantees a 30% higher net electric power than the one designed with ICE nameplate conditions.

show abstract

Analysis and optimization of the low-temperature solar organic Rankine cycle (ORC)

Cited by 343 publications

References 27 publications

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Modeling and optimization of a binary geothermal power plant

Biogas Engine Waste Heat Recovery Using Organic Rankine Cycle

Contact Info

Product

Resources

About