Organic Brayton Cycles with solid sorption thermal compression for low grade heat utilization

Dutta, Pradip; Kumar, Pramod; Ng, Kim Choon; Murthy, S. Srinivasa; Srinivasan, Kandadai

doi:10.1016/j.applthermaleng.2013.08.036

Cited by 12 publications

(8 citation statements)

References 12 publications

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“…This demerit can be overcome if compression can be achieved by means other than turbine work. Dutta et al [24] proposed a novel scheme wherein the compression is achieved using low grade thermal energy, which in this case can be from a field of flat plate or evacuated tubular collectors. The adsorption route was proposed for this process which is based on the phenomena of pressure and temperature dependent adsorption characteristics of some highly microporous activated carbons for CO 2 .…”

Section: Co2 Subcritical Brayton Cycle With Thermal Compressionmentioning

confidence: 99%

Carbon dioxide based power generation in renewable energy systems

Kumar

Srinivasan

2016

Applied Thermal Engineering

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After a substantial impact on refrigeration, carbon dioxide (CO 2 ) is gaining considerable attention as a working fluid for thermal power generation. This can be attributed mainly to its excellent heat transfer properties and compactness of components arising from its high density. It has the merit of being amenable to operation in sub-, trans-or super-critical Brayton cycle modes. However, inhibiting factors are high pressures needed when operated in trans-or supercritical cycles and the work of compression eroding most of the work of expansion in subcritical cycle operation. Some of the lacunae of CO 2 such as high work of compression can be alleviated by using non-mechanical means such as thermal compression using the adsorption technique either for partial compression in high pressure Brayton cycles or for total compression in low pressure cycles. CO 2 has also been proposed as an additive to flammable hydrocarbons such that their flammability can be suppressed and yet retaining their other desirable thermodynamic qualities. This review explores the potential and limitations of thermodynamic © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ cycles where either CO 2 is used alone or as a component in mixture of working fluids. Inter alia,it also highlights the issues of regulation of load management using the efficiency-specific power output plane. When used as a blending component, pinch point in the regenerators affects the cycle performance. The objective is to identify research and developmental challenges involving CO 2 as a working fluid specifically for solar power generation.

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Section: Co2 Subcritical Brayton Cycle With Thermal Compressionmentioning

confidence: 99%

Carbon dioxide based power generation in renewable energy systems

Kumar

Srinivasan

2016

Applied Thermal Engineering

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“…The concept of Brayton cycle with thermal compression was introduced by Dutta et al. [1]. After comparing several working fluids they recommended that carbon dioxide (CO 2 ) can be a working fluid.…”

Section: Introductionmentioning

confidence: 99%

“…The obvious weakness of subcritical Brayton cycle is that the work of compression consumes more than 60% of the work of expansion [3]. Analysis of Dutta et al [1] was limited to merely the heat source being available at 100 o C, both for thermal compression and expansion. Obviously, at such low temperatures the thermal efficiencies are deplorably low (<5%).…”

Section: Introductionmentioning

confidence: 99%

“…This approach is also logical extension of methodology used in sorption refrigeration for augmenting the refrigerant pressure [4][5][6][7]. Garg et al [3] showed that, in the case of CO2, optimum compression ratios required for low pressure CO 2 Brayton cycles are ~2, which is easily obtainable with reasonable uptake efficiencies of adsorption thermal compressors [1]. As a next step post compression, the enthalpy of CO 2 can be raised with another heat source for which concentrating solar collectors can be used.…”

Section: Introductionmentioning

confidence: 99%

“…This paper explores the potential and limitations of this approach and characterizes it through a few performance indicators such as specific work output per unit mass of adsorbent and thermal efficiency based on exergy component of the heat. For the sake of proving the concept, this analysis focuses on thermal compression through solid sorption route with Maxsorb III as the adsorbent analogous to the previous work of Dutta et al [1].…”

Section: Introductionmentioning

confidence: 99%

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Solar driven carbon dioxide Brayton cycle power generation with thermal compression

Kumar

Dutta

Murthy

et al. 2016

Applied Thermal Engineering

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Solar thermal power generation by and large uses Rankine cycles with organic working fluids or steam when highly concentrated solar source is used. Brayton cycle is seldom used because the work of compression forms a major fraction of turbine output. We investigate removal of this lacuna by adopting thermal compression using the adsorption route. Here we propose a two source operated cycle with the low temperature source used for thermal compression and the high temperature source to increase the inlet temperature of the working fluid to the turbine. We adopt carbon dioxide as the working fluid in view of its excellent heat transfer properties and environmentally friendly disposition. Activated carbon is used as the adsorbent in the thermal compression process. It is shown that, though the First law thermal efficiency does not show the real merit of the cycle, the exergetic efficiency is substantially high even for low side operating pressures in the range of 15-25 bar. In particular, where the waste heat is available around 100 o C and concentrated solar power is available even at 200-300 o C, exergetic efficiencies in excess of 25 % can be realised. When other advantages such as dispensing with one whole segment of moving parts (compressor) are taken into account, the running costs of such a cycle can be so low that it would be a

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Activated carbon–carbon dioxide based two stage adsorption compression Brayton cycle power generation

Srinivasan

Dutta

2019

Adsorption

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Organic Brayton Cycles with solid sorption thermal compression for low grade heat utilization

Cited by 12 publications

References 12 publications

Carbon dioxide based power generation in renewable energy systems

Carbon dioxide based power generation in renewable energy systems

Solar driven carbon dioxide Brayton cycle power generation with thermal compression

Activated carbon–carbon dioxide based two stage adsorption compression Brayton cycle power generation

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