Optimal boiling temperature for ORC installation

Open access

Abstract

In the paper a research on cost-effective optimum design boiling temperature for Organic Rankine Cycle utilizing low-temperature heat sources is presented. The ratio of the heat exchanger area of the boiler to the power output is used as the objective function. Analytical relations for heat transfer area as well power of the cycle are formulated. Evaporation temperature and inlet temperature of the heat source medium as well its mass flow rate are varied in the optimization method. The optimization is carried out for three working fluids, i.e. R 134a, water and ethanol. The objective function (economics profitability, thermodynamic efficiency) leads to different optimal working conditions in terms of evaporating temperature. Maximum power generation in the near-critical conditions of subcritical ORC is the highest. The choice of the working fluid can greatly affect the objective function which is a measure of power plant cost. Ethanol exhibits a minimum objective function but not necessarily the maximum cycle efficiency.

References
  • [1] Hettiarachchi H.D.M., Gloubovic M., Worek W.M., Ikegami Y.: Optimumdesign criteria for an Organic Rankine cycle using low-temperature geothermal heatsources. Energy, 32(2007), 1698-1706.

  • [2] Quoilin S. at others: Thermo-economic optimization of heat recovery organicRankine cycles. Appl. Thermal Eng. 31(2011), 2885-2893.

  • [3] m Pan L. and others: Performance analysis in near-critical conditions of organicRankine cycle. Energy 37(2012), 281-286.

  • [4] Maizza V., Maizza A.: Unconventional working fluids in organic Rankine-cyclesfor waste energy recovery systems. Appl. Thermal Eng., 21(2001), 381-390.

  • [5] Liu B.T., Chien K.-H., Wang C.-C.: Effect of working fluids on organic Rankingcycle for waste heat recovery. Energy 29(2004), 1207-1217.

  • [6] Wei D., Lu X., Lu Z, Gu J.: Performance analysis and optimisation of organicRanking cycle (ORC) for waste heat recovery. Energy Conv. and Manag, 2007, 1113-1119.

  • [7] Saleh B., Koglbauer G., Wendland M., Fischer J.: Working fluids for lowtemperatureorganic Rankine cycles. Energy 32(2007), 1210-1221.

  • [8] Chen H., Goswami D. Y., Stefanakos E. K.: A review of thermodynamic cyclesand working fluids for the conversion of low-grade heat. Renewable and Sustainable Energy Reviews 14(2010), 3059-3067.

  • [9] Fernández F.J., Prieto M.M., Suárez I.: Thermodynamic analysis of hightemperatureregenerative organic Rankine cycles using siloxanes as working fluids. Energy 36(2011), 5239-5249.

  • [10] Khennich M., Galanis N.: Optimal design of ORC systems with a lowtemperatureheat source. Entropy 13(2011), 1-1 x manuscripts; doi:10.3390/ e130x000

  • [11] Wang E.H., Zhang H.G., Fann B.Y., Ouyang M.G., Zhao Y., Mu Q.H.: Study of working fluid selection of organic Rankine cycle (ORC) for engine wasteheat recovery. Energy 36(2011), 5, 3406-3418.

  • [12] Mikielewicz J., Mikielewicz D.: A thermodynamic criterion for selection ofworking fluid for subcritical and supercritical domestic micro CHP. Appl. Thermal Eng. 30(2010), 2357-2362.

  • [13] Refprop 9.0, NIST, 2010.

Archives of Thermodynamics

The Journal of Committee on Thermodynamics and Combustion of Polish Academy of Sciences

Journal Information


CiteScore 2016: 0.54

SCImago Journal Rank (SJR) 2016: 0.319
Source Normalized Impact per Paper (SNIP) 2016: 0.598

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 23 23 14
PDF Downloads 3 3 2