Characteristics and Methods of Thermal Design of Evaporative Cooler

Mizushina, Tokurō; Ito, Ryuzo; Miyashita, Hisashi

doi:10.1252/kakoronbunshu1953.32.55

Cited by 18 publications

(14 citation statements)

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“…[2] tested an evaporative cooler with three different tube diameters (12.7 mm, 19.05 mm and 40 mm) and presented the heat and mass transfer coefficients. In another research [3], they considered the effect in variation of spray water temperature inside the tower while ignoring the evaporation of the spray water. Niitsu et al [4,5] tested tube banks of plain and finned tubes and suggested a correlation between the heat and mass transfer coefficients and diameter and air mass velocity, also ignoring the effect of the spray water flow rate.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance analysis of heat exchanger for closed wet cooling tower using heat and mass transfer analogy

2010

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In closed wet cooling towers, the heat transfer between the air and external tube surfaces can be composed of the sensible heat transfer and the latent heat transfer. The heat transfer coefficient can be obtained from the equation for external heat transfer of tube banks. According to experimental data, the mass transfer coefficient was affected by the air velocity and spray water flow rate. This study provides the correlation equation for mass transfer coefficient based on the analogy of the heat and mass transfer and the experimental data. The results from this correlation equation showed fairly good agreement with experimental data. The cooling capacity and thermal efficiency of the closed wet cooling tower were calculated from the correlation equation to analyze the performance of heat exchanger for the tower.

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Section: Introductionmentioning

confidence: 99%

Thermal performance analysis of heat exchanger for closed wet cooling tower using heat and mass transfer analogy

2010

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“…Previous work on plain tubes includes empirical data for evaporative fluid coolers. The thermal performance was subjected to mathematical and experimental analysis in the early work of Parker and Treybal [1], Mizushina et al [2,3], and Niitsu et al [4]. A model was presented by Erens [5] to predict the performance of a plain tube evaporative liquid cooler with plastic fills.…”

Section: Introductionmentioning

confidence: 99%

Performance investigation of plain and finned tube evaporatively cooled heat exchangers

Hasan¹,

Sirén²

2003

Applied Thermal Engineering

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The performance of two evaporatively cooled heat exchangers is investigated under similar operating conditions of air flow rates and inlet hot water temperatures. The heat exchangers are plain and plate-finned circular tube types which occupy the same volume. Spray water, which is circulated in a closed circuit, is injected onto the exposed surfaces of the tubes and fins. The contact between air and spray water results in evaporative heat transfer. The tubes are copper, 10 mm o.d. The finned configuration is constructed by introducing 0.5 mm thick copper plates between the tubes, with a total area ratio of four. A substantial increase in heat transfer takes place for the plate-finned tubes. The increase is 92-140% for air velocities from 1.66 to 3.57 m s À1 . A model is used to calculate the thermal performance of the plain and finned tubes assuming a constant spray water temperature in the heat exchanger. The wet-finned surfaces show low fin efficiency compared with dry surfaces. An energy index defined as the ratio of volumetric thermal conductance to air pressure drop per unit length is found to be close for the two heat exchangers. This reveals higher thermal utilisation of the occupied volume by the finned tubes with the same energy index.

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“…The two curves are overlapping, thus validating the proposed fouling model. Mizushina et al (1968), Webb (1984) and Dreyer (1988); however, it should be noted that water evaporation is not neglected in the present formulation.…”

Section: Fouling Growth Modelmentioning

confidence: 97%

The impact of fouling on performance evaluation of evaporative coolers and condensers

Qureshi

Zubair

2005

Int. J. Energy Res.

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SUMMARYFouling of evaporative cooler and condenser tubes is one of the most important factors affecting their thermal performance, which reduces effectiveness and heat transfer capability with time. In this paper, the experimental data on fouling reported in the literature are used to develop a fouling model for this class of heat exchangers. The model predicts the decrease in heat transfer rate with the growth of fouling. A detailed model of evaporative coolers and condensers, in conjunction with the fouling model, is used to study the effect of fouling on the thermal performance of these heat exchangers at different air inlet wet bulb temperatures. The results demonstrate that fouling of tubes reduces gains in performance resulting from decreasing values of air inlet wet bulb temperature. It is found that the maximum decrease in effectiveness due to fouling is about 55 and 78% for the evaporative coolers and condensers, respectively, investigated in this study. For the evaporative cooler, the value of process fluid outlet temperature T p,out varies by 0.66% only at the clean condition for the ambient wet bulb temperatures considered.

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Characteristics and Methods of Thermal Design of Evaporative Cooler

Cited by 18 publications

References 0 publications

Thermal performance analysis of heat exchanger for closed wet cooling tower using heat and mass transfer analogy

Thermal performance analysis of heat exchanger for closed wet cooling tower using heat and mass transfer analogy

Performance investigation of plain and finned tube evaporatively cooled heat exchangers

The impact of fouling on performance evaluation of evaporative coolers and condensers

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