A novel layout of air-cooled condensers to improve thermo-flow performances

Chen, Lei; Yang, Linlin; Du, Xiaoze; Yang, Yongping

doi:10.1016/j.apenergy.2015.11.062

Cited by 73 publications

(28 citation statements)

References 27 publications

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“…Lei Chen et al [2], studied the performance of the Horizontal ACCs and conclude that the off-axis flows and reverse flows in the upwind condenser cells result in the poor aerodynamic characteristics of axial flow fans, deteriorated thermos flow performances of ACCs and increased turbine back pressure of power generating units. They proposed vertically arranged of ACCs and conclude that the thermo-flow performances are greatly improved due to weakened inlet flow distortions and minimize the reverse flows and also the wind direction improves the performance of the axial flow fan and reduces the turbine back pressure at any wind speed Xiaoze Du et al [3], develop the ANN back pressure prediction model for the direct air-cooled power generating unit.…”

Section: Literature Review Salta and Kroger [1]mentioning

confidence: 99%

A Critical Review on Operating Condition for the Performance of Air Cooled Condenser Used in Thermal Power Plant

2017

IJAERD

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Section: Literature Review Salta and Kroger [1]mentioning

confidence: 99%

A Critical Review on Operating Condition for the Performance of Air Cooled Condenser Used in Thermal Power Plant

2017

IJAERD

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“…Understanding and predicting the factors or mechanisms that can reduce the heat rejection rate of an ACSC is therefore essential. Lei Chen [10] giving more attentions to the impacts of the A-frame plume chamber and axial flow fan configurations, as well as the crosswinds on the thermo-flow performances of air-cooled condensers. He stated that the off-axis flow distortion basically results in the performance deterioration of air-cooled condensers in the absence of winds, which is the weakness of the current air-cooledcondenser layout in nature.…”

Section: Introductionmentioning

confidence: 99%

Review on Wind Effect and Axial Fan Performance of Air Cooled Condenser for a Thermal Power Plant

2017

IJAERD

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“…According the Goodarizi's numerical results, by applying this novel geometry, the cooling performance of the NDDCT can be increased by 10% when crosswind speed is 10 m/s. Yang et al also proposed a novel NDDCT design where bilaterally and triangularly arranged heat exchanger bundles would restrain the crosswind effect [118][119][120]. According to their results, under specific crosswind speeds and directions, the performance could be increased.…”

Section: Cooling Tower Geometry and Heat Exchanger Arrangementmentioning

confidence: 99%

“…By improve the circumferential no-uniformity and the complexity of the air flow inside the tower, the air mass flow rate through the cooling tower can be increased by 36% when the crosswind speed is 20m/s. Chen et al [119] proposed a novel vertical arrangement of air-cooled heat exchanger to improve the thermosflow performance of the heat exchangers by utilize the wind power.…”

Section: Introductionmentioning

confidence: 99%

“…The typically arid climates in the likely locations for renewable thermal power plants such as Concentrating Solar Thermal (CST) provide the motivation for dry cooling technology optimised for renewable power generation [28,32,119,155]. Due to their low maintenance cost and simple structures, natural draft dry cooling towers (NDDCT) offer a feasible and cost effective option for such applications [5,6,25,40].…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study of small natural draft dry cooling tower for concentrating solar thermal power plant

Li¹

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The typically arid climates in the likely locations for renewable thermal power plants such as Concentrating Solar Thermal (CST) power plants provide the motivation for dry cooling technology applications. Natural draft dry cooling tower (NDDCT) with low maintenance cost and no parasitic power consumption offers a feasible and cost effective option for such applications. Compared with the conventional coal fired and nuclear power plants, the size of the CST power plant proposed for Australian regional communities is much smaller. However, the existing cooling tower design is optimised for large steam power plants, and is not optimal for these renewable power plants. (2) The performance of the experimental tower was tested at two constant heat loads of 600 kW and 840 kW, respectively, with various ambient temperatures. The 1D numerical model was refined and validated with the experimental data. The thermodynamic model of a 1 MW CST power plant running with sCO2 cycle was developed and integrated with the updated cooling tower model. Significant differences were observed between the steam Rankine and sCO2 cycles in terms of the effect of the ambient temperature on power generation. The differences between steam Rankine and sCO2 Brayton cycle in this context were analysed and discussed.(3) Two potential cooling issues with small NDDCT, the crosswind and the cold inflow, were identified and the detail experimental data were presented. The crosswind effect on small cooling tower is different from the conventional big cooling towers. With the increase of the crosswind speed, the overall cooling performance of the small NDDCT first decreases and then increases. The mixed convection theory and the Richardson Number were proposed to explain this phenomenon. On the other hand, repeated cold inflow events were observed during the tests, which cause a significant decrease of the air temperature inside the cooling tower. The water outlet temperature can be increased up to 3°C as a result of the cold inflow effect. Further analysis of the mechanism shows that the cold air incursion at the top of the cooling tower could decrease the driving force and also form an extra flow resistance for the airflow through the heat exchanger.(4) Based on the working mechanism of the air-cooled heat exchanger and the crosswind effect on NDDCT, this study proposed a new method to increase the cooling performance of NDDCT under crosswind conditions by optimizing the water mass flow rate in the air-cooled heat exchangers. By optimising the water distribution, the water outlet temperature of each heat exchanger is more uniform and the adversely influence of the crosswind can be effectively relieved.The findings in this paper can lay an important foundation for future small cooling tower design and operation.

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A novel layout of air-cooled condensers to improve thermo-flow performances

Cited by 73 publications

References 27 publications

A Critical Review on Operating Condition for the Performance of Air Cooled Condenser Used in Thermal Power Plant

A Critical Review on Operating Condition for the Performance of Air Cooled Condenser Used in Thermal Power Plant

Review on Wind Effect and Axial Fan Performance of Air Cooled Condenser for a Thermal Power Plant

Numerical and experimental study of small natural draft dry cooling tower for concentrating solar thermal power plant

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