Maximising the working fluid flow as a way of increasing power output of geothermal power plant

Borsukiewicz-Gozdur, A.; Nowak, W.

doi:10.1016/j.applthermaleng.2006.11.013

Cited by 60 publications

(22 citation statements)

References 6 publications

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“…For every working fluid, depending on its thermodynamic properties, the optimal value of the temperature drop of the slag washing water in the vaporizer ( vap T ∆ )that gives the maximum power can be determined [9]. Here in order to simplify the analysis the same temperature drop ℃ 20 = ∆ vap T was assumed for all working fluids.…”

Section: Fig 2 T-s Process Diagram Of the Organic Rankine Cyclementioning

confidence: 99%

Organic Rankine cycle power plant by low-temperature slag washing water of blast furnace

Chen¹,

Liu²,

Xiao³

2016

Proceedings of the 2016 International Conference on Civil, Transportation and Environment

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Abstract. Three typical organic fluids for Organic Rankine power cycles utilizing low-temperature slag washing water of blast furnace is presented. With the aim of making the best use of the energy contained in a stream of 60-80ºC slag washing water of blast furnace. The available heat flux of R125 is the highest, and the value of the minimum can reach 70%. When the temperature of initial slag washing water temperature is lower than 70ºC , the work fluids R125 and R245fa have the equal theoretical power and higher than the work fluid R143a.

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Section: Fig 2 T-s Process Diagram Of the Organic Rankine Cyclementioning

confidence: 99%

Organic Rankine cycle power plant by low-temperature slag washing water of blast furnace

Chen¹,

Liu²,

Xiao³

2016

Proceedings of the 2016 International Conference on Civil, Transportation and Environment

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“…Conventional power station technology is not suitable for heat sources with temperatures between 80 °C and 120 °C. According to the literature, there is an optimum evaporation temperature of the working fluid, which depends on the quantity of the recycled geothermal water, at which the capacity of the Clausius-Rankine is the highest [15]. The Kalina process [16] which is a process using a mixture of ammonia and water seems to be the only alternative to ORC.…”

Section: Geothermal Plants Using Orcmentioning

confidence: 99%

“…Due to the fact, that the used working fluid is after the expansion still in the area of superheated vapour, it is used in the regenerator (18) in order to preheat the liquid working fluid. After being desuperheated, the vapour is condensed in a condenser (15) which is cooled back with air or water from a cooling tower (16). The feed pump (17) rises the pressure of the working fluid and forces the fluid again trough the heat exchangers.…”

mentioning

confidence: 99%

Energetic and economic investigation of Organic Rankine Cycle applications

Schuster

Karellas

Kakaras

et al. 2009

Applied Thermal Engineering

418

174

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“…An investigation on the optimal design of the binary cycle power plants for maximum power output was discussed by Borsukiewicz-Gozdur and Novak [12] who maximized the working fluid flow to increase the power output of the geothermal power plant while repeatedly returning a fraction of the geothermal fluid downstream of the evaporator to completely vaporize the working fluid prior expanding in the turbine. Madhawa et al [7] presented a costeffective optimum design criterion based on the ratio of total heat transfer area to the net power output, as the objective function, for the basic ORC employing low temperature geothermal resources.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis and performance optimization of organic rankine cycles for the conversion of low-to-moderate grade geothermal heat

Yekoladio

Bello‐Ochende

Meyer

2015

Int. J. Energy Res.

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The present study considers a thermodynamic analysis and performance optimization of geothermal power cycles. The proposed binary-cycles operate with moderately low temperature and liquid-dominated geothermal resources in the range of 110 o C to 160 o C, and cooling air at ambient conditions of 25 o C and 101.3 kPa reference temperature and atmospheric pressure, respectively. A thermodynamic optimization process and irreversibility analysis were performed to maximize the power output while minimizing the overall exergy destruction and improving the First-and Second-law efficiencies of the cycle. Maximum net power output was observed to increase exponentially with the geothermal resource temperature to yield 16-49 kW per unit mass flow rate of the geothermal fluid for the nonregenerative ORCs, as compared to 8-34 kW for the regenerative cycles. The cycle First-law efficiency was determined in the range of 8-15% for the investigated geothermal binary power cycles. Maximum Second-law efficiency of approximately 56% was achieved by the ORC with an IHE. In addition, a performance analysis of selected pure organic fluids such as R123, R152a, isobutane and n-pentane, with boiling points in the range of -24 o C to 36 o C, was conducted under saturation temperature and subcritical pressure operating conditions of the turbine. Organic fluids with higher boiling point temperature, such as n-pentane, were recommended for non-regenerative cycles. The regenerative ORCs, however, require organic fluids with lower vapour specific heat capacity (i.e. isobutane) for an optimal operation of the binary-cycle.

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Maximising the working fluid flow as a way of increasing power output of geothermal power plant

Cited by 60 publications

References 6 publications

Organic Rankine cycle power plant by low-temperature slag washing water of blast furnace

Organic Rankine cycle power plant by low-temperature slag washing water of blast furnace

Energetic and economic investigation of Organic Rankine Cycle applications

Thermodynamic analysis and performance optimization of organic rankine cycles for the conversion of low-to-moderate grade geothermal heat

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