Exergetic comparison of two different cooling technologies for the power cycle of a thermal power plant

Blanco-Marigorta, Ana M.; Sanchez-Henríquez, M. Victoria; Peña-Quintana, Juan A.

doi:10.1016/j.energy.2010.09.033

Cited by 58 publications

(16 citation statements)

References 12 publications

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“…Thus, it is necessary to supply substantially more air than water to provide the same thermal capacity for heat removal from the condenser, which is accompanied by a large parasitic fan power requirement. Blanco-Marigorta et al (2011) found that with a steam condensation temperature of 37°C, this results in an exergetic efficiency of just 26% for an air cooled condenser, compared to 63% for a wet condenser. This thermal capacity difference results in ACCs requiring a higher initial temperature difference (ITD = T steam,in -T air,in ) than water cooling systems with cost-effective designs.…”

Section: Air-cooled Condenser Challengesmentioning

confidence: 99%

Achieving near-water-cooled power plant performance with air-cooled condensers

Bustamante

Rattner

Garimella

2016

Applied Thermal Engineering

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Power plants using air-cooled condensers suffer a 5 -10% plant-level efficiency penalty compared to plants with once-through cooling systems or wet cooling towers. In this study, a model of a representative air-cooled condenser (ACC) system is developed to explore the potential to mitigate this penalty through techniques that reduce the air-side thermal resistance, and by raising the air mass flow rate. The ACC unit model is coupled to a representative baseload steam-cycle power plant model. It is found that water-cooled power-plant efficiency levels can be approached by using enhanced ACCs with a combination of significantly increased air flow rates (+68%), reduced air-side thermal resistances (−66%), and air-side pressure losses near conventional levels (+24%). Emerging heat-transfer enhancement technologies are evaluated for the potential to meet these performance objectives. The impact of ambient conditions on ACC operation is also examined, and two hybrid wet/dry cooling system technologies are explored to improve performance at high ambient temperatures. Results from this investigation provide guidance for the adoption and enhancement of air-cooled condensers in power plants.

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Section: Air-cooled Condenser Challengesmentioning

confidence: 99%

Achieving near-water-cooled power plant performance with air-cooled condensers

Bustamante

Rattner

Garimella

2016

Applied Thermal Engineering

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“…The required heat for the first cell is provided either by a solar field composed of static compound parabolic collectors (CPC) and a storage system composed of two tanks of 24 m 3 capacity or by a double-effect absorption heat pump (DEAPH; using LiBr-H 2 O as absorption fluid) manufactured by Entropie in 2005 as part of the AQUASOL project framework. Assessment of the MED plant driven by hot water as the thermal energy source gave a PR of between 10.5 and 11, with a TBT of 64-67 C. These conditions were the most optimal for the first-effect tube bundle (Blanco et al 2011). Figure 1.8 shows the components of the AQUASOL system at the PSA.…”

Section: Multi-effect Distillationmentioning

confidence: 99%

Concentrating Solar Power and Desalination Plants

Palenzuela¹,

Alarcón-Padilla²,

Zaragoza³

2015

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“…Exergy analysis has been applied in various power studies [24][25][26]. Exergetic analysis for a regenerative Brayton cycle with isothermal heat addition and isentropic compressor and turbine [27] is available.…”

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Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator

Roux

Bello‐Ochende

Meyer

2011

Energy

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The small-scale open and direct solar thermal Brayton cycle with recuperator has several advantages, including low cost, low operation and maintenance costs and it is highly recommended. The main disadvantages of this cycle are the pressure losses in the recuperator and receiver, turbomachine efficiencies and recuperator effectiveness, which limit the net power output of such a system. The irreversibilities of the solar thermal Brayton cycle are mainly due to heat transfer across a finite temperature difference and fluid friction. In this paper, thermodynamic optimisation is applied to concentrate on these disadvantages in order to optimise the receiver and recuperator and to maximise the net power output of the system at various steady-state conditions, limited to various constraints. The effects of wind, receiver inclination, rim angle, atmospheric temperature and pressure, recuperator height, solar irradiance and concentration ratio on the optimum geometries and performance were investigated. The dynamic trajectory optimisation method was applied. Operating points of a standard micro-turbine operating at its highest compressor efficiency and a parabolic dish concentrator diameter of 16 metres were considered. The optimum geometries, minimum irreversibility rates and maximum receiver surface temperatures of the optimised systems are shown. For an environment with specific conditions and constraints, there exists an optimum receiver and recuperator geometry so that the system produces maximum net power output.

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Exergetic comparison of two different cooling technologies for the power cycle of a thermal power plant

Cited by 58 publications

References 12 publications

Achieving near-water-cooled power plant performance with air-cooled condensers

Achieving near-water-cooled power plant performance with air-cooled condensers

Concentrating Solar Power and Desalination Plants

Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator

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