Transcritical CO2 power cycle – Effects of regenerative heating using turbine bleed gas at intermediate pressure

Mondal, Subha; De, S. K.

doi:10.1016/j.energy.2015.04.103

Cited by 33 publications

(5 citation statements)

References 25 publications

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“…This low-grade waste heat may be used to produce electricity if suitable conversion technologies are available. Organic Rankine cycle [2][3][4], Organic flash cycle [5][6][7], transcritical CO 2 power cycles [8][9][10] are some of the possible technologies that can be used to produce the secondary energy from low-grade heat. Due to the absence of pinch limitation, a trilateral cycle is preferred to recover low grade waste heat of the industrial flue gas free from SO 2 .…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Low-Grade Heat Driven Trilateral Cycle With Single-Stage Impulse Turbine

Sahana,

Mondal

2023

BEST

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Trilateral cycle (TLC) is preferred for low-grade heat recovery due to the absence of pinch limitation. In the present study performance of a trilateral cycle is evaluated using R245fa, R1234ze (Z) and R1233zd (E) as working fluids. A single-stage impulse turbine is considered as the turbomachine of the cycle. During the analysis, instead of considering fixed isentropic efficiency of the turbine, velocity triangles are considered for the estimation of the turbine power output. The study indicates that the TLC operating with R1234ze (Z) as well as R1233zd (E) yields power output which is comparable to that of the TLC using R245fa. Thus, for the TLC, R1234ze (Z) or R1233zd (E) may be used as the possible drop-in replacement of R245fa.

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Section: Introductionmentioning

confidence: 99%

Analysis of a Low-Grade Heat Driven Trilateral Cycle With Single-Stage Impulse Turbine

Sahana,

Mondal

2023

BEST

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“…Many thermodynamics cycles are applicable in the temperature below 350 8C, like the CO 2 transcritical power cycle, Organic Rankine Cycle (ORC) and Trilateral Flash Cycle (TFC), instead of high-temperature steam Rankine Cycle (RC) [1,[3][4][5]. CO 2 has a low critical temperature, which makes it appropriate for utilizing a low heat sourcegeothermal [6,7]. CO 2 power cycles are widely used in air conditioning, heat pumps, refrigerating systems, and power cycles [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Ahmed

Imre

2021

Pollack

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Thermodynamic efficiency is a crucial factor of a power cycle. Most of the studies indicated that efficiency increases with increasing heat source temperature, regardless of heat source type. Although this assumption generally is right, when the heat source temperature is close to the critical temperature, increasing the heat source temperature can decrease efficiency. Therefore, in some cases, the increase in the source temperature, like using improved or more collectors for a solar heat source can have a double negative effect by decreasing efficiency while increasing the installation costs. In this paper, a comparison of the CO2 subcritical cycle and the Trilateral Flash Cycle will be presented to show the potential negative effect of heat source temperature increase.

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“…Rising fuel prices and increasing electricity consumption are driving the research into more efficient electricity and heat generation sources [2,3,11,13,16,18], additional limits are created by CO 2 emission reduction requirements [4,14,20,21,25]. Energy used for space and domestic water heating constitutes 1/3 of the total energy used in industrialized countries like Poland.…”

Section: Introductionmentioning

confidence: 99%

Analysis of nodalization effects on the prediction error of generalized finite element method used for dynamic modeling of hot water storage tank

Wołowicz

Kupecki

Wawryniuk

et al. 2015

Archives of Thermodynamics

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The paper presents dynamic model of hot water storage tank. The literature review has been made. Analysis of effects of nodalization on the prediction error of generalized finite element method (GFEM) is provided. The model takes into account eleven various parameters, such as: flue gases volumetric flow rate to the spiral, inlet water temperature, outlet water flow rate, etc. Boiler is also described by sizing parameters, nozzle parameters and heat loss including ambient temperature. The model has been validated on existing data. Adequate laboratory experiments were provided. The comparison between 1-, 5-, 10- and 50-zone boiler is presented. Comparison between experiment and simulations for different zone numbers of the boiler model is presented on the plots. The reason of differences between experiment and simulation is explained.

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Transcritical CO2 power cycle – Effects of regenerative heating using turbine bleed gas at intermediate pressure

Cited by 33 publications

References 25 publications

Analysis of a Low-Grade Heat Driven Trilateral Cycle With Single-Stage Impulse Turbine

Analysis of a Low-Grade Heat Driven Trilateral Cycle With Single-Stage Impulse Turbine

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Analysis of nodalization effects on the prediction error of generalized finite element method used for dynamic modeling of hot water storage tank

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