Experimental characterization of an additively manufactured heat exchanger for dry cooling of power plants

Arie, Martinus; Shooshtari, Amir; Ohadi, Michael M.

doi:10.1016/j.applthermaleng.2017.09.140

Cited by 107 publications

(19 citation statements)

References 22 publications

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“…Pin fin heat exchangers have also been studied experimentally [22][23][24], and the geometric print fidelity and surface roughness were shown to have a large effect on performance; accurate production of sharp-edged solid features below 0.5 mm could not be achieved. Arie et al [25] investigated an air-water heat exchanger fabricated with multiple metal alloys using DMLS; despite significant fabrication inaccuracies, the devices led to increases in gravimetric heat transfer density. Polymer heat exchangers fabricated using additive manufacturing technologies have also been studied [26,27], due to their favorable chemical and corrosion resistance, as well as light weight.…”

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confidence: 99%

A permeable-membrane microchannel heat sink made by additive manufacturing

Collins

Weibel

Pan

et al. 2019

International Journal of Heat and Mass Transfer

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Microchannel heat sinks are capable of removing dense heat loads from high-power electronic devices with low thermal resistance, but suffer from high pressure drops due to the small channel dimensions. Features that reduce the pressure drop, such as manifolds, increase fabrication complexity and are constrained by traditional subtractive manufacturing approaches. Additive manufacturing technologies offer improved design freedom and reduced geometric restrictions, expanding the types of features that can be produced and integrated into a heat sink. In this work, a novel permeable membrane microchannel (PMM) heat sink geometry is proposed and fabricated using direct metal laser sintering (DMLS) of an aluminum alloy (AlSi10Mg). In this PMM design, the cooling fluid is forced through thin, porous walls that act as both conducting fins and membranes that allow flow through their fine internal flow features for efficient heat exchange. The design leverages the ability of this fabrication process to incorporate complex, arbitrarily curved structures having internal porosity to enhance heat transfer and reduce pressure drop across the heat sink. The PMM heat sink geometry is benchmarked against a low-pressure-drop manifold microchannel (MMC) heat sink. A reduced-order model is used to explore the relative performance trends between the designs. Both heat sinks are experimentally characterized at flow rates of 50-500 mL/min using deionized water as the working fluid. At a constant pumping power of 0.018 W, the permeable membrane microchannel design offers both lower thermal resistance (17% reduction) and lower pressure drop (28% reduction) compared to the manifold microchannel heat sink.

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confidence: 99%

A permeable-membrane microchannel heat sink made by additive manufacturing

Collins

Weibel

Pan

et al. 2019

International Journal of Heat and Mass Transfer

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“…In the experimental part (block micro-channels), the studied parameters are duct inlet air velocities (2,5,7,12,20,40, 60 m/s) in the channels, and the heater powers (1, 2, 3, 4 and 5 W). The inlet air velocity changed with fixed power for each case.…”

Section: Resultsmentioning

confidence: 99%

“…Wall heat flux (5-120) kW/m 2 , mass flux 50-300 kg/m 2 s and system pressure 8.5-12.5 bar. [7] Studied design, fabrication, and experimental characterization of a novel additively manufactured air-water heat exchanger for dry cooling of power plants. The heat exchanger consists of manifold-microchannels on the air side and rectangular channels on the water side in a cross-flow configuration.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study to Enhance of Heat Transfer Coefficient in Air Flow Using Microchannel

Jalil

Aziz

Kadhim

2018

JUBES

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Experimental and numerical study of fluid flow and heat transfer in microchannel airflow is investigated. The study covers changing the cooling of micro-channel for the velocities and heater powers. The dimensions of the microchannel were, length = 0.1m, width = 0.001m, height = 0.0005 m. The experimental and numerical results were compared with the previous paper for velocities up to 20 m/s and heater powers up to 5 W and the comparison was acceptable. In this paper, the results were extended numerically for velocities up to 60 m/s. The numerical solution used finite volume (SIMPLE algorithm) to solve Navier Stokes equations (continuity, momentum and energy). The results show that the heat transfer coefficient increases up to 220 W/m

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“…Nowadays, direct dry cooling technology with remarkable water‐saving characteristics has been widely adopted in coal‐fired or renewable energy power plants located in arid regions 1–3 . In the direct dry cooling system (DDCS), a large amount of ambient air is forced to cool the exhaust steam from the turbine by axial flow fans, so the cooling capacity varies with the environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Operation strategies of axial flow fans in a direct dry cooling system under various meteorological conditions

et al. 2021

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For a direct dry cooling system, the turbine back pressure fluctuates with the meteorological conditions. Moreover, the operation of axial flow fans plays an important role in the cooling performance of air‐cooled condensers (ACC). It is of significant use to study the operation strategies of axial flow fans under various ambient conditions. Based on typical 2 × 660 MW direct dry cooling power generating units, the ACC model coupled with the turbine thermodynamic characteristics is developed, by which the thermo‐flow performances of the ACC are predicted in the dominant wind direction, and then the standard coal consumption is calculated. The results show that the increased ambient temperature and wind speed, or the reduced fan rotational speed leads to the high turbine back pressure. At the low ambient temperature and wind speed, the standard coal consumption rate of the unit can be reduced by reducing the speed of axial flow fans appropriately, with the maximum drop in coal consumption rate reached 0.734 g/(kWh) when the ambient temperature is 10°C without wind. If the wind speed exceeds 12 m/s or the ambient temperature reaches 25°C, 110% of the rated fan rotational speed is recommended.

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Experimental characterization of an additively manufactured heat exchanger for dry cooling of power plants

Cited by 107 publications

References 22 publications

A permeable-membrane microchannel heat sink made by additive manufacturing

A permeable-membrane microchannel heat sink made by additive manufacturing

Experimental and Numerical Study to Enhance of Heat Transfer Coefficient in Air Flow Using Microchannel

Operation strategies of axial flow fans in a direct dry cooling system under various meteorological conditions

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