Parametric study and performance evaluation of an organic Rankine cycle (ORC) system using low-grade heat at temperatures below 80 °C

Kim, Dong Kyu; Lee, Ji Sung; Kim, Jinwoo; Kim, Mo Se; Kim, Min Soo

doi:10.1016/j.apenergy.2016.12.026

Cited by 54 publications

(13 citation statements)

References 24 publications

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“…The pressure difference is also achievable by other methods. One concept is to use the gravity of the working fluid, i.e., enough height difference between evaporator and condenser [45]. Although the height brings about a pressure difference, the required value becomes a barrier in several applications.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Wang

Jiang

et al. 2019

Energies

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Small-scale organic Rankine cycle (ORC) systems driven by solar energy are compared in this paper, which aims to explore the potential of power generation for domestic utilisation. A solar thermal collector was used as the heat source for a hot water storage tank. Thermal performance was then evaluated in terms of both the conventional ORC and an ORC using thermal driven pump (TDP). It is established that the solar ORC using TDP has a superior performance to the conventional ORC under most working conditions. Results demonstrate that power output of the ORC using TDP ranges from 72 W to 82 W with the increase of evaporating temperature, which shows an improvement of up to 3.3% at a 100 °C evaporating temperature when compared with the power output of the conventional ORC. Energy and exergy efficiencies of the ORC using TDP increase from 11.3% to 12.6% and from 45.8% to 51.3% when the evaporating temperature increases from 75 °C to 100 °C. The efficiency of the ORC using TDP is improved by up to 3.27%. Additionally, the exergy destruction using TDP can be reduced in the evaporator and condenser. The highest exergy efficiency in the evaporator is 96.9%, an improvement of 62% in comparison with that of the conventional ORC, i.e., 59.9%. Thus, the small-scale solar ORC system using TDP is more promising for household application.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Wang

Jiang

et al. 2019

Energies

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“…A current challenge is to identify new market applications for this energy [11,12]. Indeed, the efficient use of heat at low temperatures is limited to a few applications such as power generation from ORC [13,14], which has poor efficiency at low temperatures, heating of horticultural greenhouses [12], preheating steps in industrial processes [15,16], and heat supply for anaerobic digestion of biomass [17]. Due to the geographical location of the power units (i.e., generally close to residential buildings and municipal infrastructures, integrated to district heating networks), it is seldom possible to develop such "unavoidable" heat waste recovery systems.…”

Section: Low-grade Heat Recovery (T < 70 • C)mentioning

confidence: 99%

Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses

et al. 2019

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The aim of this paper is to improve the operating share of a biomass cogeneration unit by using unavoidable heat waste heat recovered from a district network heating used for drying woody biomass’ return water (law-grade temperature heat). The optimal operating conditions of a drying unit added to the system were estimated from an energy and a financial point of view, applying four objective functions (drying time, energy consumption, energy balance, and financial performance of the cogeneration unit). An experimental design methodology used heat for the implementation of these functions and to obtain an operating chart. Numerical modelling was performed to develop a simulation tool able to illustrate the unsteady operations able to take into account the available waste heat. Surprisingly, the model shows that the right strategy to increase the financial gain is to produce more warm water than necessary and to consequently dispose higher quantities of unavoidable heat in the network’s return water, which heat up the drying air at a higher temperature. This result contrasts with the current approaches of setting-up cogeneration units that are based on the minimization of the heat production.

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“…out to create the same pressure difference by replacing the EDP with other kind of virtual pump without consuming the electricity e.g. gravity driven pump [27], thermal driven pump (TDP) [28], and combined driven pump. However, these virtual pumps could improve the thermal efficiency while bringing some other problems or limitations e.g.…”

Section: Introductionmentioning

confidence: 99%

Techno-economic analysis on a small-scale organic Rankine cycle with improved thermal driven pump

Jiang

Wang

Roskilly

2020

Energy Conversion and Management

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Thermal driven pump is usually defined as a thermodynamic way which plays a similar role to replace common electricity driven pump. In this paper, a concept of improved thermal driven pump series is introduced to small-scale organic Rankine cycle and the up-limit thermal efficiency is explored by using discrete dividing method. Results indicate that power outputs of organic Rankine cycle by using thermal driven pump V2 range from 158.8 W to 343.1 W which are improved by up to 73.5% when compared with that using previous type V1. Energy and exergy efficiencies using improved type V2 and V3 increase from 0.018 to 0.043 and from 0.145 to 0.246, respectively. The largest increment could reach 40.5% and the highest value could account for 85% of the up-limit performance.Influencing factors i.e. mass ratio and pump efficiency are defined to further evaluate the performance in the possible applications. One remarkable inspiration is that organic Rankine cycle by using improved thermal driven pump may be an alternative solution to conventional type which could achieve the better techno-economic performance only under the conditions of dividing number smaller than 4 and the scale less than 10 kW.

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Parametric study and performance evaluation of an organic Rankine cycle (ORC) system using low-grade heat at temperatures below 80 °C

Cited by 54 publications

References 24 publications

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation

Recovery of Low-Grade Heat (Heat Waste) from a Cogeneration Unit for Woodchips Drying: Energy and Economic Analyses

Techno-economic analysis on a small-scale organic Rankine cycle with improved thermal driven pump

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