Development of supercritical water heat-transfer correlation for vertical bare tubes

Mokry, Sarah; Pioro, Igor; Farah, Amjad; King, Krysten; Gupta, Sahil; Peiman, Wargha; Kirillov, P. L.

doi:10.1016/j.nucengdes.2010.06.012

Cited by 240 publications

(155 citation statements)

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“…Re Pr   (9) and thatof the supercritical water/steam side isobtained by [35], As shown in Fig. 2, the molten salt flows from upside to underside while the water/steam flows in the reverse direction.…”

Section: Numentioning

confidence: 91%

Off-design performance of concentrated solar heat and coal double-source boiler power generation with thermocline energy storage

Zhang

et al. 2017

Applied Energy

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. 6. Such a hybrid system is promising for future applications. AbstractIntegration of solar thermal energy into a coal-fired power station is a promising technology for many coal-dependent countries. This work revealed the off-design performance of such a dual heat source boiler power generation from a system-level modelling approach. As an example study, heat from a solar power tower (SPT)was integrated into a 660 MW supercritical coal-firing power unit, and two integration schemes were considered. A system level analytical model was established that

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Section: Numentioning

confidence: 91%

Off-design performance of concentrated solar heat and coal double-source boiler power generation with thermocline energy storage

Zhang

et al. 2017

Applied Energy

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“…The strong variation of the properties in this region may lead to several effects related to the fluid acceleration, high specific heat layer, buoyancy (for vertical channels), etc., which can deteriorate or enhance locally/globally the heat transfer [49]. In order to reproduce these phenomena, several authors introduced correction factors in the Nusselt correlation [50][51][52].…”

Section: Heat Exchangersmentioning

confidence: 99%

Technical and economic optimization of subcritical, wet expansion and transcritical Organic Rankine Cycle (ORC) systems coupled with a biogas power plant

Dumont

Dickes

Роса

et al. 2018

Energy Conversion and Management

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A B S T R A C TGenerally, > 40% of the useful energy (cooling engine and exhaust gases) are wasted by a biogas power plant through the cooling radiator and the exhaust gases. An efficient way to convert this waste heat into work and eventually electricity is the use of an organic Rankine cycle (ORC) power system. Over the last few years, different architectures have been widely investigated (subcritical, wet expansion and trans-critical). Despite the promising performances, realistic economic and technical constraints, also related to the application, are required for a meaningful comparison between ORC technologies and architectures. Starting from the limited literature available, the aim of the present paper is to provide a methodology to compare sub-critical, transcritical and wet expansion cycles and different types of expanders (both volumetric and turbomachinery) from both technical and economic point of view, which represent one of the main novel aspects of the present work. In particular, the paper focuses on the thermo-economic optimization of an ORC waste heat recovery unit for a 500 kWe biogas power plant located in a detailed regional market, which was not investigated yet. By means of a genetic algorithm, the adopted methodology optimizes a given economic criteria (Pay-Back Period, Net Present Value, Profitability Index and Internal Rate of Return) while respecting technical constraints (expander limitations) and thermodynamic constraints (positive pinch points in heat exchangers, etc.).The results show that optimal ORC solutions with a potential of energy savings up to 600 MWh a year and with a pay-back period lower than 3 years are achievable in the regional market analysed.

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“…The results from the measurements are compared with heat transfer correlations from the literature [26][27][28][29] for both operating conditions. Only the heat transfer correlation derived by Nariai et al [26] is applicable for helical coil tubes in the operational range of 20 bar < p < 35 bar, 150 kg/m 2 ·s < G < 850 kg/m 2 ·s.…”

Section: Comparison Of the Experimental Nusselt Number With Heat Tranmentioning

confidence: 99%

“…Additionally, two heat transfer correlations of Dittues-Boelter type, derived by Jackson and Fewster [28] and Mokry et al [29] for the supercritical fluids (water, CO2) are used for the comparison of the experimental Nusselt number obtained at supercritical heat transfer measurements. These two heat transfer correlations are developed for horizontal and vertical flow and are one of the most accurate heat transfer correlations derived for supercritical heat transfer fluids and have a wide application range.…”

Section: Comparison Of the Experimental Nusselt Number With Heat Tranmentioning

confidence: 99%

“…These two heat transfer correlations are developed for horizontal and vertical flow and are one of the most accurate heat transfer correlations derived for supercritical heat transfer fluids and have a wide application range. The heat transfer correlation derived by Mokry et al [29] was used in the design procedure of the helical coil heat exchanger and is valid for 200 kg/m²·s < G < 1500 kg/m²·s. The results are presented in Figure 8.…”

Section: Comparison Of the Experimental Nusselt Number With Heat Tranmentioning

confidence: 99%

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Experimental Assessment of a Helical Coil Heat Exchanger Operating at Subcritical and Supercritical Conditions in a Small-Scale Solar Organic Rankine Cycle

et al. 2017

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Abstract:In this study, the performance of a helical coil heat exchanger operating at subcritical and supercritical conditions is analysed. The counter-current heat exchanger was specially designed to operate at a maximal pressure and temperature of 42 bar and 200 • C, respectively. The small-scale solar organic Rankine cycle (ORC) installation has a net power output of 3 kWe. The first tests were done in a laboratory where an electrical heater was used instead of the concentrated photovoltaic/thermal (CPV/T) collectors. The inlet heating fluid temperature of the water was 95 • C. The effects of different parameters on the heat transfer rate in the heat exchanger were investigated. Particularly, the performance analysis was elaborated considering the changes of the mass flow rate of the working fluid (R-404A) in the range of 0.20-0.33 kg/s and the inlet pressure varying from 18 bar up to 41 bar. Hence, the variation of the heat flux was in the range of 5-9 kW/m 2 . The results show that the working fluid's mass flow rate has significant influence on the heat transfer rate rather than the operational pressure. Furthermore, from the comparison between the experimental results with the heat transfer correlations from the literature, the experimental results fall within the uncertainty range for the supercritical analysis but there is a deviation of the investigated subcritical correlations.

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Development of supercritical water heat-transfer correlation for vertical bare tubes

Cited by 240 publications

References 4 publications

Off-design performance of concentrated solar heat and coal double-source boiler power generation with thermocline energy storage

Off-design performance of concentrated solar heat and coal double-source boiler power generation with thermocline energy storage

Technical and economic optimization of subcritical, wet expansion and transcritical Organic Rankine Cycle (ORC) systems coupled with a biogas power plant

Experimental Assessment of a Helical Coil Heat Exchanger Operating at Subcritical and Supercritical Conditions in a Small-Scale Solar Organic Rankine Cycle

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