Gas Turbine Intake Air Hybrid Cooling Systems and a New Approach to Their Rational Designing

Yang, Zongming; Radchenko, Mykola; Radchenko, Andrii; Mikielewicz, Dariusz; Radchenko, Roman

doi:10.3390/en15041474

Cited by 21 publications

(12 citation statements)

References 55 publications

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“…So as refrigeration and heat consumption has seasonal or periodical character it is preferably to use rest excessive refrigeration for cooling engine cyclic air [13,14]. Such in-cycle trigeneration [15,16] makes it possible to keep engine operation at stabilized lowered temperature with high thermodynamic efficiency and produce addition electricity leading to arising electricity ant total efficiency as result.…”

Section: Introductionmentioning

confidence: 99%

Innovative approaches and modified criteria to improve a thermodynamic efficiency of trigeneration plants

Radchenko,

Forduy

et al. 2024

Journal of Energy Systems

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Trigeneration plants (TGP) desired for combined production of electricity, heat and refrigeration are highly flexible to follow current loading. But their highest efficiency might be possible only when heat production coincides with its consumption, which is generally impossible in traditional TGP with applying the absorption lithium-bromide chiller (ACh) converting the heat, released from combustion engine in the form of hot water, into refrigeration. Usually, the excessive heat of hot water, not consumed by ACh, is removed to the atmosphere through emergency radiator. However, the well-known methods of TGP efficiency assessment do not consider those heat losses and give the overestimated magnitudes of efficiency for conventional TGP with ACh. The application of booster ejector chiller (ECh), as an example, for utilization of the residual waste heat, remained from ACh and evaluated about 25%, has been proposed to produce supplementary refrigeration for cooling cyclic air of driving combustion engine to increase its electrical efficiency by 3-4 %. In the case of using the supplementary refrigeration for technological or other needs the heat efficiency of TGP will increase to about 0.43 against 0.37 for typical TGP with ACh as example. The new modified criteria to assess a real efficiency of conventional TGP, based on ACh, are proposed which enable to reveal the way of its improvement through minimizing the heat waste. Such combined two-stage waste heat recovery system of TGP can be considered as the alternative to the use of back-up gas boiler to pick up the waste heat potential for conversion by ACh to meet increased refrigeration needs.

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Section: Introductionmentioning

confidence: 99%

Innovative approaches and modified criteria to improve a thermodynamic efficiency of trigeneration plants

Radchenko,

Forduy

et al. 2024

Journal of Energy Systems

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“…So far as the effect, achieved due to cooling sucked air and evaluated by CDH number as a primary criterion, depends on the temperature of cooled air limited by difference between the temperatures of air cooled and coolant at the air cooler outlet accordingly, it could be enhanced by heat transfer intensification. The latter, in its turn, enables deeper air cooling by applying, for instance, the coolants of different temperature (chilled water, boiling refrigerant) in two-stage hybrid air coolers 35,46 fed by coolants from WHRCh of combined types, for instance absorption-ejector chillers (AECh). 10…”

Section: Introductionmentioning

confidence: 99%

“…11,33 The latter becomes possible due to combustion of waterfuel emulsion that makes possible to apply low temperature condensing surfaces. 13,34,35 Besides, the harmful emissions can be reduced through exhaust gas ecological recirculation. 36 In both cases, the exhaust gas heat can be converted into refrigeration for cooling engine intake air, primary evaluated by cooling degree hour (CDH) numbers.…”

Section: Introductionmentioning

confidence: 99%

“…45 So far as the effect, achieved due to cooling sucked air and evaluated by CDH number as a primary criterion, depends on the temperature of cooled air limited by difference between the temperatures of air cooled and coolant at the air cooler outlet accordingly, it could be enhanced by heat transfer intensification. The latter, in its turn, enables deeper air cooling by applying, for instance, the coolants of different temperature (chilled water, boiling refrigerant) in two-stage hybrid air coolers 35,46 fed by coolants from WHRCh of combined types, for instance absorption-ejector chillers (AECh). 10 In order to increase heat flux at reduced temperature difference in heat exchangers, leading to decrease the sizes of heat exchangers and corresponding energy spent to cover their aerodynamic resistance at lowered leaving temperature of cooled air simultaneously, the various methods of heat transfer intensification 47,48 and advanced heat exchangers 47,49,50 and injector circulation contours 10 are proposed.…”

Section: Introductionmentioning

confidence: 99%

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A novel degree-hour method for rational design loading

Radchenko

Mikielewicz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Cooling degree-hours (CDH) received the broadest application in evaluation of the ambient air cooling efficiency in power engineering (engine intake air cooling systems) and air conditioning. The current CDH numbers are defined as a drop in air temperature multiplied by associated time duration of performance and their summarized annual number is used to estimate the annual effect achieved due to sucked air cooling in power plants based on combustion engines (fuel saving, power output increment) and in air conditioning (refrigeration energy generation according to needs). A majority of approaches to designing ambient air cooling systems is proceeding from the cooling capacity of the chillers selected to provide a maximum current or annual CDH number with corresponding maximum current or annual effect (additional energy produced or fuel consumption reduction) in site climate location. But such approaches lead to inevitable oversizing the chillers and cooling systems in the whole. The analysis of intake air cooling efficiency in site varying climatic conditions, accompanied by quite a simple numerical simulation, enabled to reveal the potential of its enhancement and evaluate numerically the results of each step of designing in logical sequence. The new approaches to cooling system rational designing were introduced, that enables to synthesize and substantiate innovative principal decisions to exclude unproductive waste of installed (design) cooling capacity in actual operation. The innovative findings of methodological approaches include the use of the rate of annual CDH number increment as an indicator for selecting the optimum and rational values of design cooling capacity. The optimum cooling capacity corresponds to maximum rate of summarized annual CDH increment and maximum level of thermal loading accordingly, which provides minimum sizes of the chiller. In reality, it is a minimum permissible value of cooling capacity of the chiller installed and the overall ambient air cooling system. The rational cooling capacity, that enables to achieve practically maximum value of annual CDH and avoid chiller oversizing, is determined as the second, local, maximum of the rate in the summarized annual CDH over the range above the first one, global, maximum. A rational design cooling capacity determined by applying the novel methodology allows to decrease the ambient air cooling system sizes by 15 to 20% compared with traditional designing issuing from the peaked thermal load during a year. With this practically a maximum annual effect in fuel saving (energy generation or others) can be achieved too.

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“…Waste heat utilization in most power plants is limited to using waste gas heat for heat production in steam boilers, which is seasonal [10,11]. The high cost of replacing existing power plants with modern steam and gas turbines is challenging [12,13]. In addition, the modern power plant's efficiency depends on climatic conditions and decreases significantly with increasing ambient temperature: every 10 • C increase in air temperature at the engine's inlet causes an increase in fuel consumption from 0.5 to 0.7% [14,15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermopressor with Incomplete Evaporation for Gas Turbine Intercooling Systems

Løvås

Konovalov

et al. 2022

Energies

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One of the promising ways to increase fuel and modern gas turbine energy efficiency is using cyclic air intercooling between the stages of high- and low-pressure compressors. For intercooling, it is possible to use cooling in the surface heat exchanger and the contact method when water is injected into the compressor air path. In the presented research on the cooling contact method, it is proposed to use a thermopressor that implements the thermo-gas-dynamic compression process, i.e., increasing the airflow pressure by evaporation of the injected liquid in the flow, which moves at near-sonic speed. The thermopressor is a multifunctional contact heat exchanger when using this air-cooling method. This provides efficient high-dispersion liquid spraying after isotherming in the high-pressure compressor, increasing the pressure and decreasing the air temperature in front of the high-pressure compressor, reducing the work on compression. Drops of water injected into the air stream in the thermopressor can significantly affect its characteristics. An increase in the amount of water increases the aerodynamic resistance of the droplets in the stream. Hence, the pressure in the flow parts of the thermopressor can significantly decrease. Therefore, the study aims to experimentally determine the optimal amount of water for water injection in the thermopressor while ensuring a positive increase in the total pressure in the thermopressor under conditions of incomplete evaporation. The experimental results of the low-consumption thermopressor (air consumption up to 0.52 kg/s) characteristics with incomplete liquid evaporation in the flowing part are presented. The research found that the relative water amount to ensure incomplete evaporation in the thermopressor flow part is from 4 to 10% (0.0175–0.0487 kg/s), without significant pressure loss due to the resistance of the dispersed flow. The relative increase in airflow pressure is from 1.01 to 1.03 (5–10 kPa). Based on experimental data, empirical equations were obtained for calculating the relative pressure increase in the thermopressor with evaporation chamber diameters of up to 50 mm (relative flow path length is from 3 to 10 and Mach number is from 0.3 to 0.8).

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Gas Turbine Intake Air Hybrid Cooling Systems and a New Approach to Their Rational Designing

Cited by 21 publications

References 55 publications

Innovative approaches and modified criteria to improve a thermodynamic efficiency of trigeneration plants

Innovative approaches and modified criteria to improve a thermodynamic efficiency of trigeneration plants

A novel degree-hour method for rational design loading

Investigation of Thermopressor with Incomplete Evaporation for Gas Turbine Intercooling Systems

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