Fundamental experiment of pumpless Rankine-type cycle for low-temperature heat recovery

Yamada, Noboru; Minami, Takahiro; Sies, Mohamad Farid

doi:10.1016/j.energy.2010.12.007

Cited by 56 publications

(18 citation statements)

References 19 publications

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“…But restricted to the manufacturing process, the limit pressure of the scroll expander is relatively low, and it is generally lower than 1.5 MPa. The extra power consumption of the working fluid pump in the small‐scale (rated power lower than 5 kW) ORC system is generally a large proportion of or even more than the system total power output, which results in low or negative net energy efficiency . To tackle this problem, Li et al proposed a gravity driven small‐scale ORC system for cogeneration applications in 2013.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on a small-scale pumpless organic Rankine cycle with R1233zd(E) as working fluid at low temperature heat source

Wang

et al. 2019

Int J Energy Res

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Summary This paper focuses on the novelty pumpless organic Rankine cycle (ORC) and its choice of working fluids. Based on the selection criteria, the refrigerant of R1233zd(E) is firstly chosen and investigated in the pumpless ORC system. In the system, the feed pump is removed, and the refrigerant flows back and forth between two heat exchangers, which act as the evaporator or condenser, respectively. The impacts of the heating water temperature and loads on the system performance are studied to find out the best operating conditions. The low‐grade heat source is simulated by an electric boiler. The temperature of the heat resource ranges from 80°C to 100°C with the interval of 5°C. The temperature of the cooling water inlet is 10°C and is kept constant. The largest average power output is 127 W under the condition of 100°C heating water with nine loads. Because the cycle efficiency with heating steam temperature of 100°C cannot be determined, the highest energy and exergy efficiencies are 3.5% and 17.1%, respectively, for heating water of 95°C with seven loads. The experimental results show that the energy and exergy efficiencies increase with the increase of the heating temperature. The power and current outputs increase when the loads increase under the condition of the constant heating water temperature, whereas the voltage output decreases meanwhile. The generating time increases when the loads increase. This phenomenon is mainly caused by the increasing evaporating pressure and decreasing condensing pressure when the loads increases.

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Section: Introductionmentioning

confidence: 99%

Experimental study on a small-scale pumpless organic Rankine cycle with R1233zd(E) as working fluid at low temperature heat source

Wang

et al. 2019

Int J Energy Res

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“…(12) and (14). Finally, the energy load for each component of the LT loop was calculated, giving the net power output of the LT loop ð _ W n;LT Þ through…”

Section: Combined System Performance Analysismentioning

confidence: 99%

“…Guo et al investigated the performance of a novel cogeneration system that consisted of a low temperature, geothermallypowered ORC subsystem, an intermediate heat exchanger subsystem, and a heat pump subsystem [12,13]. Yamada et al carried out a basic experiment using a new pumpless organic Rankine cycle for power generation from a low-temperature heat source [14]. Vaja and Gambarotta described a specific thermodynamic analysis in order to efficiently match an ORC to that of a stationary internal combustion engine.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a novel system combining a dual loop organic Rankine cycle (ORC) with a gasoline engine

Wang

Zhang

Zhao

et al. 2012

Energy

134

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a b s t r a c tAn organic Rankine cycle (ORC) can be used to harness the wasted heat from an internal combustion engine. In this paper, the characteristics of a novel system combining a gasoline engine with a dual loop ORC which recovers the waste heat from both the exhaust and coolant systems is analyzed. A high temperature loop recovers the exhaust heat while a low temperature loop recovers both the residual high temperature loop heat and the coolant heat. The performance map of a gasoline engine is measured on an engine test bench and the heat quantities wasted by the exhaust and coolant systems are calculated and compared within the engine's entire operating region. Based on this data, the working parameters of a dual loop ORC are defined, and the performance of a combined engine-ORC system is evaluated across this entire region. The results show that the net power of the low temperature loop is higher than that of the high temperature loop, and the relative output power improves by from 14 to 16% in the peak effective thermal efficiency region to 50% in the small load region, and the absolute effective thermal efficiency increases by 3e6% throughout the engine's operating region.

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“…As well known that numerical method is suitable for a varied application and solution is got fast. But, unfortunately, solution with numerical method is impacted with quality of grid and discrete scheme and so on [8][9][10]. Thus the entire program nowadays could not have accuracy and stable solution.…”

Section: Introductionmentioning

confidence: 99%

Added Mass of Beam Vibration On Fluid With Finite Amplitude

Liu¹,

Miu²

2016

Proceedings of the 2016 International Conference on Civil, Structure and Environmental Engineering

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Abstract:As the strong non-linear characteristic of Naveir-Strokes equation, the theory of fluid-structure interaction (FSI) has a slow progress. This paper solves a two-dimensional FSI problem in which a Euler-beam vibrating in fluid. The beam satisfies Euler-Benelli beam assumption and fluid is a non-vertox, non-viscosity fluid. On the basic of above assumption and with Fourier series method, the governing equation is reduced and the theoretical solution is obtained. From the solution, the frequency of beam vibration is in accordance with the nature frequency of the beam vibrating with a "added mass". And on the axis direction of beam, velocity and pressure is a simple harmonic quantity, on the normal direction of beam, velocity and pressure is in a quantity in the exponent. On the field of time, all the physical quantity are the harmonic function. Besides, the numerical simulation was carried out and the result agreed with theory predictor.

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Fundamental experiment of pumpless Rankine-type cycle for low-temperature heat recovery

Cited by 56 publications

References 19 publications

Experimental study on a small-scale pumpless organic Rankine cycle with R1233zd(E) as working fluid at low temperature heat source

Experimental study on a small-scale pumpless organic Rankine cycle with R1233zd(E) as working fluid at low temperature heat source

Performance analysis of a novel system combining a dual loop organic Rankine cycle (ORC) with a gasoline engine

Added Mass of Beam Vibration On Fluid With Finite Amplitude

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