The influence of windbreak wall orientation on the cooling performance of small natural draft dry cooling towers

Lu, Yuanwei; Gurgenci, Hal; Guan, Zhiqiang; He, Suoying

doi:10.1016/j.ijheatmasstransfer.2014.09.012

Cited by 53 publications

(35 citation statements)

References 24 publications

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“…A small natural draft cooling tower of 20 m was developed by the University of Queensland for small-scale renewable power plants for remote Australian communities [3]. Issues with the design of small natural draft cooling tower have been addressed by Lu et al [4,5].…”

mentioning

confidence: 99%

Selected Papers From the 17th IAHR (International Association for Hydro-Environment Engineering and Research) International Conference on Cooling Tower and Heat Exchanger

Hooman

Guan

Gurgenci

2016

Heat Transfer Engineering

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mentioning

confidence: 99%

Selected Papers From the 17th IAHR (International Association for Hydro-Environment Engineering and Research) International Conference on Cooling Tower and Heat Exchanger

Hooman

Guan

Gurgenci

2016

Heat Transfer Engineering

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“…In some simulations, the porous media model is selected to model the pressure drop of the heat exchanger [56,73,74]. This model can prevent the possibility of vortices occurring near the radiator, allowing air flow through heat exchanger only vertically.…”

Section: Cfd Simulationmentioning

confidence: 99%

“…However, the second method can be applied in the lab-scale tests and numerical modelling where the cooling tower can be made to run with constant hot water inlet temperature. pronounced in short cooling towers [6,42,56,73,74]. If we refer to the speed at which the crosswind effect starts reversing as the critical speed, for a 20 m cooling tower, the critical wind speed is about 5 m/s [79].…”

Section: Crosswind Effect On the Nddcthmentioning

confidence: 99%

“…One reason the models fail at high crosswind speeds is that they assume all hot air to exit the cooling tower only from the tower top. However, according to a number of articles [6,73,74,77,79,89], a significant fraction of hot air is sucked out of the cooling tower from the tower inlet at high crosswind speeds.…”

Section: Eq (2-21)mentioning

confidence: 99%

“…Under crosswind condition, the windbreak wall can effectively obstruct the direct attack of crosswind to the interior flow field, it can change the direction of the crosswind and force the wind flow through the heat exchanger. Kroger [76,103] [6,43,74,89], using both CFD modelling and lab-scale tests. They reported that under certain crosswind speeds, the performance of the NDDCT can be significantly increased and the negative effect of crosswind can be turned into a performance enhancement.…”

Section: Internal Windbreak Wallmentioning

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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Condenser cooling technologies for concentrating solar power plants: a review

Aseri

Sharma

Kandpal

2021

Environ Dev Sustain

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The influence of windbreak wall orientation on the cooling performance of small natural draft dry cooling towers

Cited by 53 publications

References 24 publications

Selected Papers From the 17th IAHR (International Association for Hydro-Environment Engineering and Research) International Conference on Cooling Tower and Heat Exchanger

Selected Papers From the 17th IAHR (International Association for Hydro-Environment Engineering and Research) International Conference on Cooling Tower and Heat Exchanger

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

Condenser cooling technologies for concentrating solar power plants: a review

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