Fluids and parameters optimization for a novel cogeneration system driven by low-temperature geothermal sources

Guo, Tao; Wang, H.X.; Zhang, S.J.

doi:10.1016/j.energy.2011.02.005

Cited by 152 publications

(52 citation statements)

References 55 publications

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“…That is, ξ < 0: a wet fluid, ξ~0: an isentropic fluid, and ξ > 0: a dry fluid. Isentropic fluid R245fa was selected as the working fluid based on its good cycle performance [9,10] and eco-friendly characteristics [35], and it has been widely used in ORCs up to now and is researched quite well [36]. However, the global warming potential (GWP) of working fluid is not considered in this research.…”

Section: System Description and Assumptionsmentioning

confidence: 99%

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

Jiao

Tian

et al. 2017

Entropy

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Taking net power output as the optimization objective, the exergy loss distribution of the subcritical Organic Rankine Cycle (ORC) system by using R245fa as the working fluid was calculated under the optimal conditions. The influences of heat source temperature, the evaporator pinch point temperature difference, the expander isentropic efficiency and the cooling water temperature rise on the exergy loss distribution of subcritical ORC system are comprehensively discussed. It is found that there exists a critical value of expander isentropic efficiency and cooling water temperature rise, respectively, under certain conditions. The magnitude of critical value will affect the relative distribution of exergy loss in the expander, the evaporator and the condenser. The research results will help to better understand the characteristics of the exergy loss distribution in an ORC system.

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Section: System Description and Assumptionsmentioning

confidence: 99%

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

Jiao

Tian

et al. 2017

Entropy

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“…A combined power generation and direct use in process or district heating applications such as a cogeneration system, is thus recommended to improve the geothermal energy utilization while avoiding a susceptible thermal pollution of the environment caused by the geothermal fluid being discarded as waste heat at relatively high temperature [4,28].…”

Section: Sensitivity Analysismentioning

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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“…And, the environment affect from the geothermal power plant was lower than the fossil power plant which was similarly Brophy [5], Kose [6] and Dagdas [7]. For the simulation studies, the selection of suitable working fluids for the organic rankine cycle (ORC) system was the hot issue which had many reports to study this topic such as Hettiarachchi et al [8], Schuster et al [9], Guo [10], Sauret et al [11], Liu et al [12], Edrisi et al [13], Li et al [14], and Rodriguez et al [15]. It was found that the suitable working fluid of those results were different because the system conditions of each study were different.…”

Section: Introductionmentioning

confidence: 99%

Geothermal Energy Potentials and Technologies in Thailand

Chaiyat¹,

Chaychana²,

Singharajwarapan³

2017

J Fundam Renewable Energy Appl

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This paper presents a concept for using the geothermal energy in Thailand. The geophysical properties and the suitable technologies are considered; moreover the prototypes of the suitable technology have been constructed and tested the system performances. The potential of 97 hot springs in Thailand are classified into three groups as high, moderate and low potential. Organic rankine cycle is selected for 12 high potential hot springs to generate electricity 3,909 kWe. Absorption chiller and 8 moderate potential hot springs could be produced the total cooling capacity 304 kW and the payback period is 22 months. Central drying room and 8 moderate potential hot springs could be used in the heating process at 406 kW and the payback period is 15 months. Drying room integrated with vapor compression heat pump is represented for boosting 26 low potential hot springs. The upgrading heat around 2,002 kW could be used for drying the agricultural products 200 Ton/d which the payback period is 29 months. It could be found that the geothermal energy potential in Thailand could be developed from 46 hot springs to be used for heat and power at around 6.6 MW.

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Fluids and parameters optimization for a novel cogeneration system driven by low-temperature geothermal sources

Cited by 152 publications

References 55 publications

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

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

Geothermal Energy Potentials and Technologies in Thailand

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