Finite circular fin method for heat and mass transfer characteristics for plain fin-and-tube heat exchangers under fully and partially wet surface conditions

Pirompugd, Worachest; Wang, Chi-Chuan; Wongwises, Somchai

doi:10.1016/j.ijheatmasstransfer.2006.07.017

Cited by 54 publications

(26 citation statements)

References 18 publications

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“…The conditions were selected such that condensation occurred on the entire fin surface. So partial condensation on fins is not included [5,10,25]. The numerical analyses of the fully wetted fins indicate that the heat transfer fin efficiency for wetted fins is similar to that for dry fins, as shown by comparison of Figures 4 and 8.…”

Section: Fully Wetted Fin Conditionsmentioning

confidence: 80%

“…An equivalent convection heat transfer term for fully wet conditions was added to impact the heat transfer, owing to the condensation latent heat. There have been few analyses of the fin efficiency for fully wet conditions, though there have been many studies [22][23][24][25][26][27][28][29] turning to the fin efficiency values. Some design manuals [12] and many experimental studies [24] have used the Schmidt model for dry conditions and the McQuiston model [12,13] for fully wet conditions.…”

Section: Introductionmentioning

confidence: 99%

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Airside fin efficiencies for finned-tube heat exchangers with forced convection

Cheng

Zhang

2011

Sci. China Technol. Sci.

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The heat transfer and mass transfer fin efficiencies were analyzed numerically to show that popular models for heat transfer fin efficiency for circular fins are not always reasonable. The numerical results show that the effective heat transfer area of a circular fin increases several times faster than that of a straight fin for the same tube radius. Then, a simple but accurate heat transfer fin efficiency model was developed and verified by numerical results for a wide range of fin designs. This model predicts the heat transfer fin efficiency with absolute errors of less than 1%. The heat transfer and mass transfer fin efficiencies were found to be quite different for typical air flow with low relative humidity. Thus, these two fin efficiencies should not be assumed to be equal and a mass transfer fin efficiency model was developed, based on the heat transfer fin efficiency model. These heat transfer and mass transfer fin efficiencies are very useful for more accurate prediction for a wide range of practical applications. circular fin efficiency, heat transfer, mass transfer, humid air condensation Citation:Li C, Li J M, Zhang H R. Airside fin efficiencies for finned-tube heat exchangers with forced convection.

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Section: Fully Wetted Fin Conditionsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Airside fin efficiencies for finned-tube heat exchangers with forced convection

Cheng

Zhang

2011

Sci. China Technol. Sci.

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“…However, when the RH ai is about 100%, the Lewis number (Le) decreases as the Reynolds number (Re Dc ) increases. Figure 4a shows the plots of predicted Lewis number (Le) and experimental data by using the correlations of Pirompugd et al (2007;. The correlations gives larger error of Lewis number (Le) ranging from -52 to 23%.…”

Section: Resultsmentioning

confidence: 99%

The Behavior of Lewis Number in Finned Tube Cooling Coils under Highly Moist Inlet Air Conditions

Howongsakun¹,

Theerakulpisut²,

Sujumnongtokul³

et al. 2016

IJTech

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The objective of this research was to study the effects of highly moist inlet air conditions such as temperature, relative humidity, and frontal air velocity on the value of the Lewis number (Le) in the cooling and dehumidifying process of air. A finned tube cooling coil was tested under ranges of temperature, relative humidity and frontal velocity. It was found that the Lewis number (Le) varied within the range of 0.921.62 and that the increase in inlet air relative humidity tends to decrease the Lewis number (Le). Based on the experimental, a correlation for predicting the Lewis number (Le) was also established in this article. The correlation has the mean absolute error (MAE) of 3.04% and covers 98.07% of the data where a discrepancy within ± 10%.

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“…According to the previous studies [14]- [16], it is understood that n t has insignificant effects on both air and refrigerant side heat transfer coefficients and therefore it is assumed to be ignorable. Furthermore, we assume the overall heat transfer coefficient U o is regarded being unrelated to n t , and the friction factor, f, is regard being invariable with n t according to Ref.…”

Section: Determination the Optimal Tube Row Numbermentioning

confidence: 99%

Optimisation of Direct Expansion (DX) Cooling Coils Aiming to Building Energy Efficiency

Liang¹,

Yang²,

Chan³

et al. 2015

JBCPR

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Efficient Air Conditioning (A/C) system is the key to reducing energy consumption in building operation. In order to decrease the energy consumption in an A/C system, a method to calculate the optimal tube row number of a direct expansion (DX) cooling coil for minimizing the entropy generation in the DX cooling which functioned as evaporator in the A/C system was developed. The optimal tube row numbers were determined based on the entropy generation minimization (EGM) approach. Parametric studies were conducted to demonstrate the application of the analytical calculation method. Optimal tube row number for different air mass flow rates, inlet air temperatures and sensible cooling loads were investigated. It was found that the optimal tube row number of a DX cooling coil was in the range of 5 -9 under normal operating conditions. The optimal tube row number was less when the mass flow rate and inlet air temperature were increased. The tube row number increased when the sensible cooling load was increased. The exergy loss when using a non-optimal and optimal tube row numbers was compared to show the advantage of using the optimal tube row number. The decrease of exery loss ranged from around 24% to 70%. Therefore the new analytical method developed in this paper offers a good practice guide for the design of DX cooling coils for energy conservation.

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Finite circular fin method for heat and mass transfer characteristics for plain fin-and-tube heat exchangers under fully and partially wet surface conditions

Cited by 54 publications

References 18 publications

Airside fin efficiencies for finned-tube heat exchangers with forced convection

Airside fin efficiencies for finned-tube heat exchangers with forced convection

The Behavior of Lewis Number in Finned Tube Cooling Coils under Highly Moist Inlet Air Conditions

Optimisation of Direct Expansion (DX) Cooling Coils Aiming to Building Energy Efficiency

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