[PPT] - Min-Ju Ju Heo *, D. K. Lee*, B. Y. Lee**, C. Y. Park*, June Lee*** PowerPoint Presentation

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Min-Ju Ju Heo*†, D. K. Lee*, B. Y. Lee**, C. Y. Park*, June Lee***

*Seoul National University, **Daegu Catholic University, ***University of Pittsburgh

2018. 08. 07

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01 I Intr troducti tion 02 Ma Mate terial al & Me Meth thod

Field Experiment
Regression analysis
Estimation of the Latent Heat
Evaluation of the Cooling Effect

03 03 Results ts & & D Discussion

Calibration of the Model
Evaluation of the Cooling Effect

04 C Conclusion

I N D E X

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01 01 Intr

trod

ducti

tion

n

(Du et al., 2016) (Syafii et al., 2017) (O’Malley et al,, 2015)

Si Simulat atio ion Sa Satellit ite e image Field measur urem emen ent

Va

Variou

us

s method

ds

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01 01 Intr

trod

ducti

tion

n

Water

Evaporation Latent Heat Sensible Heat

Mechanism

sm of

f coo
oling

g effect in in the w water

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Evaporation Model Equation Reference Mass transfer

𝐹 = (0.4 + 0.199𝑋)(𝑓𝑥𝑏𝑢𝑓𝑠 − 𝑓𝑏𝑗𝑠 ) (Rohwer, 1931)

Energy budget

𝐹 = 1.26 𝑡 𝑡 + 𝛿 (𝑆𝑜 − 𝐻) (Prestley & Taylor, 1972)

Combination

𝐹 = 𝑡 𝑡 + 𝛿 𝑆𝑜 − 𝐻 𝜇 × 86.4 + 𝛿 𝑡 + 𝛿 (0.26(0.5 + 0.54𝑋)(𝑓𝑥𝑏𝑢𝑓𝑠 − 𝑓𝑏𝑗𝑠 ))

(Penman, 1948)

s: slope of saturated vapor pressure-temperature curve at air temperature

Evapor
ration
n Mod
del

In urban an microclimat ate,

‘Precise Evaporation Data' ‘mm/day’

01 01 Intr

trod

ducti

tion

n

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Field Experiment
Regression analysis
Estimation of Latent Heat
Evaluation of Cooling Effect

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02 02 Mat

ateri rial al & & Meth thod

d
Fl

Flow

w Chart

Regression an anal alys ysis

Dalton’s Model Evaporation Model for an hour

Calibration

Field Experiment

Air Temperate Relative Humidity Wind Speed

meteorological data

Net Radiation Water Temp Evaporation

Estimat atio ion of Lat atent Heat at Eva valuat ation of Cooling Effect

Bulk Aerodynamic Formula

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02 02 Mat

ateri rial al & & Meth thod

d
Fi

Field E Exp xperiment

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02 02 Mat

ateri rial al & & Meth thod

d

http://acessopercon.com.br/percon/testo-175h1/ https://www.tempcon.co.uk Measured data Symbols Location Model Measuring range Resolution Accuracy M Evaporation 𝐹𝑝𝑐𝑡 Over the Class A pan BYL-EV250 (Logger: CR1000) 0~240 mm 0.01mm ±0.03mm H Lt Ambient Temperature 𝑈𝑏𝑗𝑠 Over the Class A pan Testo 175H1

20 ~ +55 ℃

0.1 ℃ ±0.4 ℃ Test Ger Relative Humidity 𝑆𝐼 Over the Class A pan Testo 175H1 0 ~100 %RH 0.1 %RH ±2%(2~98 %) RH at +25 ℃ Test Ger Wind Speed 𝑋 Over the Class A pan 03101-L (Logger: CR1000) 0~50m/s 0.5m/s ±0.5m/s C Sc Lt Water Temperature 𝑈 𝑞𝑏𝑜 in the Class A pan HOBO Water Temperature Pro v2

40 ~ +70 ℃

0.02 ℃ ±0.2 ℃ O C C 𝑈𝑞𝑝𝑜𝑒 in the Pond Net radiation flux 𝑆𝑜𝑞𝑏𝑜 Over the Class A pan CNR4 net radiometer (Logger: CR1000) Spectral range: 300 to 2800 (shortwave) nm Spectral range: 4500 to 42000 (longwave) nm 5 to 20 µV/W/m² (Sensitivity) ±100 W/ ㎡ C Sc Lt 𝑆𝑜𝑞𝑝𝑜𝑒 Over the Pond

Fi

Field E Exp xperiment

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02 02 Mat

ateri rial al & & Meth thod

d

𝐹 = (𝑏 + 𝑐𝑋)(𝑓𝑥𝑏𝑢𝑓𝑠 − 𝑓𝑏𝑗𝑠) (1)

Dalton’s s model

Regr

gress ssion

n analysi

sis

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02 02 Mat

ateri rial al & & Meth thod

d

𝑅𝑓 = 𝜍𝑥𝑏𝑢𝑓𝑠λ𝐹𝑞𝑝𝑜𝑒

∗

1 3600 ℎ𝑝𝑣𝑠 𝑡𝑓𝑑𝑝𝑜𝑒 ∗ 1 1000 𝑛𝑛 𝑛

(2)

Latent t Heat Flux

𝑀𝐹 = 𝑅𝑓𝐵 ∗ 3600

𝑡𝑓𝑑𝑝𝑜𝑒 ℎ𝑝𝑣𝑠

(3)

Latent t Heat Energy gy

Est

stimation

n of
f the L

Latent He Heat

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𝜍𝑏

02 02 Mat

ateri rial al & & Meth thod

d

Cooling Effect

(Du et al., 2016);

𝛦𝑈 =

𝑀𝐹 𝑑𝑏𝑛𝑏

(5)

𝜍𝑏 𝑑𝑏

ℎ

𝑛𝑏 = 𝜍𝑏𝐵ℎ

(4)

Evaluation
n of
f the C

Coo

oling

g Effect

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03 03 Resu

sult lts s an and Dis iscuss ssio ion

Obse

served D Data

Max : 0.258 mm at 6 PM on Oct. 29 Most evaporation from 3PM to 7PM

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03 03

The resu

sult of the v verification for 𝑓𝑤𝑏𝑞𝑝𝑠𝑏𝑢𝑗𝑝𝑜 𝑛𝑝𝑒𝑓𝑚

𝐹∗=(0.01127+0.00432W)(ewater−eair)

(4)

Resu sult lts s an and Dis iscuss ssio ion

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03 03

Evaluation
n the coo
oling

g effect

Mean 54.63 W/㎡ Max 131.71 W/㎡ Min 24.68 W/㎡

Resu sult lts s an and Dis iscuss ssio ion

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03 03

Evaluation
n the coo
oling

g effect

Resu sult lts s an and Dis iscuss ssio ion

Max Mean Min 100m 5.88 2.41 1.1 200m 1.7 0.7 0.32 300m 0.79 0.33 0.15 400m 0.46 0.19 0.09 500m 0.3 0.12 0.06 740m 0.14 0.06 0.03 (Unit: ℃)

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04 04

Eva

valuat ation of cooling effect o t of wat ater body t through precise eva vaporat ation meas asurement

Smal

all effect a t around 9 AM / l lar arge e effect ar t around 3 PM

The

The cooling effect in t in th this site te i is 0 0.7 d degrees i in av averag age (Assuming th the r ran ange o

f 200 m)

Co Conclu lusi sion

n
Summary

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04 04

Wat

ater c circulat ation betw tween th the p pond an and p pan an

Lac

ack of an anal alys ysis of a a ran ange of th the cooling effect

Considerat

ation

n of sto

torag age heat at

Applicat

ation to to va various site tes

Co Conclu lusi sion

n
Limitation
n and Fu

Future rese search

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Funding: This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) [grant number 18AUDP-B102560-04]

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