Technical feasibility of a gravity-type pumpless ORC system with one evaporator and two condensers

Gao, Peng; Wang, Z.X.; Wang, L.W.; Lu, H.T.

doi:10.1016/j.applthermaleng.2018.09.049

Cited by 12 publications

(2 citation statements)

References 22 publications

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“…In 2011, Yamada et al 15 proposed a micro‐scale pumpless Rankine cycle (PRC) which had no liquid pump and appeared as intermittent power generation. Later in 2013, lots of experiments were made by Yamada et al 16 to test the generation performance of the intermittent PRC system, which showed that the average output power was about 20 W. In the same year, Li et al 17 proposed a gravity‐driven ORC, selecting PF5060 as working fluid, but the minimum height required for compressing was about 20.9 m. To realize the small‐scale PRC, Gao et al established an intermittent PRC system with R245fa as working fluid in 2015 18 and a modified PRC system in 2018, 19 which obtained the maximum shaft power (361.0 W) at 95°C hot water temperature and the thermal efficiency range (2.4%‐3.1%) at 80°C to 95°C heat source temperature. In 2019, Lu et al 20 experimentally investigated a 100 W‐scale PRC.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a cascading power cycle without electric pumps for recovering waste heat from vanadium slag

et al. 2021

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In this article, a novel cascading power cycle (CPC) driven by waste heat in a wide temperature range is proposed for promoting the energy grade, heat source recovery rate and cycle performance, which is consisted of a pumpless absorption power cycle and a pumpless organic Rankine cycle, taking ammonia-water and R245fa as working fluids, respectively. Based on an 800 t/d rotary kiln, the air of 300 C to 350 C from the solid-gas heat exchanger is recovered for power generation and the calcining process. Gravity-assisted thermally driven "pump" (GTP) substitutes the conventional electric driven pump to realize "pumpless." The two sub-cycles are analyzed with the T-s diagram. Moreover, multi-objective optimization is adopted to obtain an optimal decision by comprehensively considering system efficiency and net work. The optimization results of the CPC-GTP are concluded as 47.52% exergy efficiency, 130.90 kW total net work, 16.53% thermal efficiency and 82.58% heat recovery rate, with the evaluation index value of 97.01%.

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Section: Introductionmentioning

confidence: 99%

Analysis of a cascading power cycle without electric pumps for recovering waste heat from vanadium slag

et al. 2021

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“…To lessen the influence of the pump on the ORC property, a novel concept was proposed-pumpless ORC. Gao et al [34] raised the gravity-type pumpless ORC to ensure the stability and continuity of the system shaft power output. Bao et al [35] believed that an ORC system without a pump can achieve a more compact and efficient arrangement, which can improve the system's net efficiency.…”

Section: Introductionmentioning

confidence: 99%

Investigating the System Behaviors of a 10 kW Organic Rankine Cycle (ORC) Prototype Using Plunger Pump and Centrifugal Pump

et al. 2020

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Based on a 10-kW organic Rankine cycle (ORC) experimental prototype, the system behaviors using a plunger pump and centrifugal pump have been investigated. The heat input is in the range of 45 kW to 82 kW. The temperature utilization rate is defined to appraise heat source utilization. The detailed components' behaviors with the varying heat input are discussed, while the system generating efficiency is examined. The exergy destruction for the four components is addressed finally. Results indicated that the centrifugal pump owns a relatively higher mass flow rate and pump isentropic efficiency, but more power consumption than the plunger pump. The evaporator pressure drops are in the range of 0.45-0.65 bar, demonstrating that the pressure drop should be considered for the ORC simulation. The electrical power has a small difference using a plunger pump and a centrifugal pump, indicating that the electric power is insensitive on the pump types. The system generating efficiency for the plunger pump is approximately 3.63%, which is 12.51% higher than that of the centrifugal pump. The exergy destruction for the evaporator, expander, and condenser is almost 30%, indicating that enhancing the temperature matching between the system and the heat (cold) source is a way to improve the system performance.

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Modelling and numerical simulation of a novel Pumpless Rankine Cycle (PRC)

Gkimisis

Arapkoules²,

Vasileiou

et al. 2020

Applied Thermal Engineering

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Technical feasibility of a gravity-type pumpless ORC system with one evaporator and two condensers

Cited by 12 publications

References 22 publications

Analysis of a cascading power cycle without electric pumps for recovering waste heat from vanadium slag

Analysis of a cascading power cycle without electric pumps for recovering waste heat from vanadium slag

Investigating the System Behaviors of a 10 kW Organic Rankine Cycle (ORC) Prototype Using Plunger Pump and Centrifugal Pump

Modelling and numerical simulation of a novel Pumpless Rankine Cycle (PRC)

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