Experimental Study of Evaporative Cooler

Mizushina, Tokurō; Ito, Ryuzo; Miyashita, Hisashi

doi:10.1252/kakoronbunshu1953.31.469

Cited by 19 publications

(29 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the correlations for the data presented in Fig. 7 are [2]. The correlation for the current work falls between that concluded from measurements for a CWCT prototype using the computational model [9] and Niitsu et al [4].…”

Section: Resultssupporting

confidence: 85%

“…Fig. 5 shows a scatter of a s from the measurement data, which could also be noticed in the data presented by Mizushina et al [2] and Dreyer and Erens [7]. The latter authors attributed it to high sensitivity of a s to variations of spray water temperature.…”

Section: Resultssupporting

confidence: 72%

“…Available empirical correlations are in the broad range for the value of a s . For plain circular tubes and C=D ¼ 1:78 kg s À1 m À2 , the value of a s (W m À2 K À1 ) is 2544 according to Mizushina et al [2], 1696 according to Parker and Treybal [1], and 1290 according to Niitsu et al [4]. The latter authors presented a correlation for finned tubes which gives a s ¼ 744 W m À2 K À1 , while the Leidenfrost and Korenic correlation [12] for finned in-line tube evaporative condensers gives a s ¼ 2920 W m À2 K À1 .…”

Section: Resultsmentioning

confidence: 99%

“…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%

See 3 more Smart Citations

Performance investigation of plain and finned tube evaporatively cooled heat exchangers

Hasan¹,

Sirén²

2003

Applied Thermal Engineering

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance investigation of plain and finned tube evaporatively cooled heat exchangers

Hasan¹,

Sirén²

2003

Applied Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…Mizushina et al [2] characterized three heat transfer geometries, corresponding to different tube diameters, determining empirical heat and mass transfer coefficients correlations for each one.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on air side heat and mass transfer phenomena in evaporative condensers

Fiorentino¹,

Starace²

2017

IJHT

View full text Add to dashboard Cite

The evaporative cooling is an energy saving technology and for this reason is widely used both in industrial and civil fields. The heat and mass transfer phenomena occurring inside their tube banks are hard to study and even if many researchers have faced them, further activities need to be carried out. For this reason, this work aims at investigating with an experimental approach the evaporative condensers performance at the tube scale, focusing on the air side where more complex physical interactions occur. A test rig has been set up made of a rectangular transparent channel where electrical heaters simulate the refrigerant side and embedded Pt100 Resistance Temperature Detectors controlled by a PID set and keep constant a given outer surface temperature. Water and air operating conditions are controlled as well, and this allows to carry out a sensitivity analysis depending on all the parameters influencing those thermo-fluid dynamic phenomena. The results show that the cooling rate decreases with the air relative humidity and dry bulb temperature, while increases with water flow rate and temperature. For the testing cases the maximum improvements deriving from increasing water flow rate and temperature are of 37 % and 14 % respectively.

show abstract

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

Qureshi

Zubair

2005

Int. J. Energy Res.

View full text Add to dashboard Cite

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.

show abstract

Experimental Study of Evaporative Cooler

Cited by 19 publications

References 0 publications

Performance investigation of plain and finned tube evaporatively cooled heat exchangers

Performance investigation of plain and finned tube evaporatively cooled heat exchangers

Experimental investigations on air side heat and mass transfer phenomena in evaporative condensers

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

Contact Info

Product

Resources

About