Thermodynamic optimisation and analysis of four Kalina cycle layouts for high temperature applications

Modi, Anish; Haglind, Fredrik

doi:10.1016/j.applthermaleng.2014.11.047

Cited by 66 publications

(25 citation statements)

References 19 publications

(29 reference statements)

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“…The fluid file contains a refit of the ammonia equation of state that is compatible with the latest excess Helmholtz mixture model. The new ammonia-water mixture formulation is more stable and faster [14] while giving outputs that are very close to that of the earlier Tillner-Roth and Friend [10] formulation (REFPROP 9.0). For pure component transport properties, the same database is used while the critical mixture properties (temperature, pressure, and density) are evaluated using the experimentally established formulations by Sassen et al [15].…”

Section: Transport Propertiesmentioning

confidence: 59%

An Assessment of Transport Property Estimation Methods for Ammonia–Water Mixtures and Their Influence on Heat Exchanger Size

et al. 2015

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Transport properties of fluids are indispensable for heat exchanger design. The methods for estimating the transport properties of ammonia-water mixtures are not well established in the literature. The few existent methods are developed from none or limited, sometimes inconsistent experimental data sets, conducted for the liquid phase only. These data sets are usually confined to low concentrations and temperatures, which are much less than those occurring in Kalina cycle boilers. This paper presents a comparison of various methods used to estimate the viscosity and the thermal conductivity of ammonia-water mixtures. Firstly, the different methods are introduced and compared at various temperatures and pressures. Secondly, their individual influence on the required heat exchanger size (surface area) is investigated. For this purpose, two case studies related to the use of the Kalina cycle are considered: a flue-gas-based heat recovery boiler for a combined cycle power plant and a hot-oil-based boiler for a solar thermal power plant.The different transport property methods resulted in larger differences at high pressures and temperatures, and a possible discontinuous first derivative, when using the interpolative methods in contrast to the corresponding state methods. Nevertheless, all possible mixture transport property combinations used herein resulted in a heat exchanger size within 4.3 % difference for the flue-gas heat recovery boiler, and within 12.3 % difference for the oil-based boiler.

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Section: Transport Propertiesmentioning

confidence: 59%

An Assessment of Transport Property Estimation Methods for Ammonia–Water Mixtures and Their Influence on Heat Exchanger Size

et al. 2015

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“…It was found to be more stable and with fewer convergence failures, without significantly compromising on the accuracy of the calculations [22]. …”

Section: Methodsmentioning

confidence: 98%

“…Since its , for waste heat recovery [4][5][6][7], for exhaust heat recovery in a gas turbine modular helium reactor [8], in combined heat and power plants [9,10], coupled with a coal-fired steam power plant for exhaust heat recovery [11], as a part of Brayton-Rankine-Kalina triple cycle [12], and in solar power plants [13,14]. For high temperature applications, the Kalina cycles have been investigated to be used as gas turbine bottoming cycles [15][16][17][18], for industrial 15 waste heat recovery, biomass based cogeneration and gas engine waste heat recovery [19], for direct-fired cogeneration applications [20], and in concentrating solar power (CSP) plants [21,22]. There have been discussions regarding the feasibility of using ammonia-water mixtures at high temperatures due to the nitridation effect resulting in the corrosion of the equipment.…”

Section: Introductionmentioning

confidence: 99%

Part-load performance of a high temperature Kalina cycle

Modi

Andreasen

Kærn

et al. 2015

Energy Conversion and Management

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The Kalina cycle has recently seen increased interest as an alternative to the conventional steam Rankine cycle. The cycle has been studied for use with both low and high temperature applications such as geothermal power plants, ocean thermal energy conversion, waste heat recovery, gas turbine bottoming cycle and solar power plants. The high temperature cycle layouts are inherently more complex than the low temperature layouts due to the presence of a distillation-condensation subsystem, three pressure levels and several heat exchangers. This paper presents a detailed approach to solve the Kalina cycle in part-load operating conditions for high temperature (a turbine inlet temperature of 500• C) and high pressure (100 bar) applications. A central receiver concentrating solar power plant with direct vapour generation is considered as a case study where the part-load conditions are simulated by changing the solar heat input to the receiver. Compared with the steam Rankine cycle, the Kalina cycle has an additional degree of freedom in terms of the ammonia mass fraction which can be varied in order to maximize the part-load efficiency of the cycle. The results include the part-load curves for various turbine inlet ammonia mass fractions, and the fitted equations for these curves.

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“…The composition of the ammonia-water mixture could be varied by changing the ammonia mass fraction which is defined as the ratio of the mass of ammonia in the mixture to the total mass of the mixture. Since its introduction, several uses for the Kalina cycle have been proposed such as in a geothermal power plant, for waste heat recovery, and in solar power plants [13].…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Absorption Power Cycle Depending on Source Temperatures

Kim¹

2015

JOCET

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Abstract-The absorption power generation systems using ammonia-water mixture as a working fluid are proven to be the feasible method for utilizing a low-temperature heat source in the form of sensible energy. In this paper, an exergy analysis is carried out for an absorption power generation system of Kalina cycle using ammonia-water mixture as the working fluid for efficient conversion of low-temperature heat source. Effects of the ammonia mass fraction and the heat source temperature are parametrically investigated on the exergy destruction of each component of the system and the exergy efficiency of the system. Results show that the exergetical performance is greatly affected by the heat source temperature and the ammonia mass fraction of the working fluid.

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Thermodynamic optimisation and analysis of four Kalina cycle layouts for high temperature applications

Cited by 66 publications

References 19 publications

An Assessment of Transport Property Estimation Methods for Ammonia–Water Mixtures and Their Influence on Heat Exchanger Size

An Assessment of Transport Property Estimation Methods for Ammonia–Water Mixtures and Their Influence on Heat Exchanger Size

Part-load performance of a high temperature Kalina cycle

Exergy Analysis of Absorption Power Cycle Depending on Source Temperatures

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