Numerical model of sprayed air cooled condenser coupled to refrigerating system

Youbi-Idrissi, M.; Macchi-Tejeda, Hélène; Fournaison, Laurence; Guilpart, J.

doi:10.1016/j.enconman.2007.01.025

Cited by 47 publications

(13 citation statements)

References 12 publications

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“…˚C and Twb=9.11 ˚C), the results for 20 µm and 50 µm droplet diameters as well as the corresponding empirical predictions are shown in Figure 4-4 using equation (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19). The results…”

Section: Model Verification Using Single Droplet Evaporationmentioning

confidence: 99%

“…A number of experimental studies [15,19,33,37] and computational fluid dynamics models [5,33,38,42,43,45,118] have been carried out on spray cooling performance. Spray is a two-phase flow phenomenon and experience several actions when injected into air including heat, mass and momentum transfer.…”

Section: Spray Simulationsmentioning

confidence: 99%

“…Although spray cooling system is industrially in use [3,4], and a considerable amount of literature has been published about cooling inlet air by spray in different practice, mainly gas turbine fogging and air conditioning [5,6], cooling the air entering NDDCTs by water spray is sparse in the literature [7,8].…”

Section: Paper Content 1 Introductionmentioning

confidence: 99%

“…Inlet air spray cooling has many applications such as gas turbine fogging and air conditioning [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In certain instances, dry cooling tower performance can be enhanced during high ambient air temperature periods by pre-cooling of the inlet air by spraying atomized water into the inlet air. Despite spray cooling system being in industrial use [3,4], and a considerable amount of literature having been published about inlet air pre-cooling by spray in different practice, mainly gas turbine fogging and air conditioning [5,6], cooling the air entering NDDCTs by water spray is sparse in the literature [7,8]. The motivation of this work is to understand spray cooling process and improve spray cooling systems for inlet air pre-cooling in NDDCTs to maximise cooling performance.…”

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confidence: 99%

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Modelling and experimental study of spray cooling systems for inlet air pre-cooling in natural draft dry cooling towers

Alkhedhair¹

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Geothermal energy is a promising renewable energy to be used for baseload electricity. Most potential sites with high geothermal temperature are mostly located in remote areas where water is limited. This is besides water scarcity and environmental protection, which made dry cooling systems a better alternative solution for heat rejection of power plants. Furthermore, natural draft cooling towers have the advantage of avoiding parasitic losses introduced by the fans at mechanical draft cooling towers. However, power plants utilizing dry cooling technologies experience a significant reduction in power generation during high ambient temperature periods. This reduction often goes along with the peak power demand which results in a great loss for the power plant owners. In certain instances, dry cooling tower performance can be enhanced during these periods by pre cooling of the inlet air by spraying atomized water into the inlet air.The present study introduces the use of spray cooling for inlet air pre-cooling in natural draft cooling towers. Spray cooling is investigated in this study due to its simplicity, low capital cost, ease of operation and maintenance, and capability of increasing power plant efficiency while consuming only a small amount of water compared to wet cooling towers or other evaporative cooling methods. Although spray cooling has found successful applications in process coolers and gas turbine inlet air cooling, the large scale applications in power industry have been limited.Several issues limit the application in power industry. The main one is the incomplete evaporation of water droplets which can cause corrosion and scaling of heat exchanger surface. Incomplete evaporation also increases operational cost due to water consumption. To the best of our knowledge, a detailed investigation of the spray cooling performance in natural draft dry cooling towers operating environment has not yet been performed. The aim of the current work is to optimise a spray cooling system for inlet air pre-cooling in natural draft dry cooling towers.In the present study, an Eulerian-Lagrangian 3-D numerical model was developed which is capable of simulating evaporating water sprays produced by real nozzles. In order to reproduce real nozzle characteristics in the simulation, a new adaptable method for hollow-cone spray representation in Eulerian-Lagrangian numerical models was developed. This allows real nozzles characterised during experiments to be included in the simulation, thereby correctly accounting for radial evolution of droplet size distribution and air/droplets momentum exchange. The CFD model was applied to calculate local droplet transport and evaporation, and spray cooling efficiency at different operating conditions for spray cooling systems optimisation under typical Natural Draft Dry Cooling Tower conditions.iii Experimental measurements from a wind tunnel test rig simulating Natural Draft Dry Cooling Tower inlet flow conditions have been performed in order to investigate droplet transport...

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