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

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

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

01 01 Intr trod oducti tion on  Va Variou ous s method ods Field measur urem emen ent Satellit Sa ite e image Simulat Si atio ion (O’Malley et al,, 2015) (Du et al., 2016) (Syafii et al., 2017)

01 Intr 01 trod oducti tion on  Mechanism sm of of coo ooling g effect in in the w water Evaporation Water Sensible Heat Latent Heat

01 01 Intr trod oducti tion on  Evapor oration on Mod odel Evaporation Equation Reference Model Mass transfer 𝐹 = (0.4 + 0.199 𝑋 )( 𝑓 𝑥𝑏𝑢𝑓𝑠 − 𝑓 𝑏𝑗𝑠 ) (Rohwer, 1931) Energy ‘mm/day’ 𝑡 𝑡 + 𝛿 ( 𝑆 𝑜 − 𝐻 ) (Prestley & Taylor, 1972) 𝐹 = 1.26 budget 𝑡 + 𝛿 𝑆 𝑜 − 𝐻 𝑡 𝛿 𝐹 = × 86.4 + 𝑡 + 𝛿 (0.26(0.5 Combination ( Penman , 1948 ) 𝜇 + 0.54 𝑋 )( 𝑓 𝑥𝑏𝑢𝑓𝑠 − 𝑓 𝑏𝑗𝑠 )) s: slope of saturated vapor pressure-temperature curve at air temperature In urban an microclimat ate, ‘Precise Evaporation Data'

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

02 Mat 02 ateri rial al & & Meth thod od  Fl Flow ow Chart Regression Estimat atio ion of Field Experiment an anal alys ysis Lat atent Heat at Bulk Aerodynamic meteorological data Dalton’s Model Formula Air Temperate Relative Humidity Calibration Wind Speed Evaporation Evaporation Model Water Eva valuat ation of Net for an hour Temp Cooling Effect Radiation

02 02 Mat ateri rial al & & Meth thod od  Fi Field E Exp xperiment

02 02 Mat ateri rial al & & Meth thod od Measured Measuring Symbols Location Model Resolution Accuracy M data range  Fi Field E Exp xperiment 𝐹 𝑝𝑐𝑡 Evaporation Over the BYL-EV250 0~240 mm 0.01mm ±0.03 mm H Class A pan (Logger: Lt CR1000) 𝑈 𝑏𝑗𝑠 Ambient Over the Testo 175H1 -20 ~ +55 ℃ 0.1 ℃ ± 0.4 ℃ Test Temperature Class A pan Ger 𝑆𝐼 Relative Over the Testo 175H1 0 ~100 %RH 0.1 %RH ±2 %(2~98 Test Humidity Class A pan %) RH at Ger +25 ℃ 𝑋 Wind Speed Over the 03101-L 0~50m/s 0.5m/s ±0.5 m/s C Class A pan (Logger: Sc CR1000) Lt 𝑞𝑏𝑜 Water 𝑈 in the Class HOBO -40 ~ +70 ℃ 0.02 ℃ ± 0.2 ℃ O Temperature A pan Water C Temperature C 𝑈 𝑞𝑝𝑜𝑒 in the Pond Pro v2 𝑆𝑜 𝑞𝑏𝑜 Net Over the CNR4 net Spectral range: 5 to 20 ±100 W/ C radiation Class A pan radiometer 300 to 2800 µV/W/m² ㎡ Sc flux (Logger: (shortwave) nm (Sensitivity) Lt 𝑆𝑜 𝑞𝑝𝑜𝑒 Over the CR1000) Spectral range: Pond 4500 to 42000 https://www.tempcon.co.uk (longwave) nm http://acessopercon.com.br/percon/testo-175h1/

02 Mat 02 ateri rial al & & Meth thod od  Regr gress ssion on analysi sis Dalton ’ s s model (1) 𝐹 = (𝑏 + 𝑐𝑋)(𝑓 𝑥𝑏𝑢𝑓𝑠 − 𝑓 𝑏𝑗𝑠 )

02 02 Mat ateri rial al & & Meth thod od  Est stimation on of of the L Latent He Heat 1 ℎ𝑝𝑣𝑠 1 𝑛𝑛 (2) Latent t Heat Flux ∗ 𝑅 𝑓 = 𝜍 𝑥𝑏𝑢𝑓𝑠 λ 𝐹 𝑞𝑝𝑜𝑒 ∗ 𝑡𝑓𝑑𝑝𝑜𝑒 ∗ 3600 1000 𝑛 𝑡𝑓𝑑𝑝𝑜𝑒 (3) Latent t Heat Energy gy 𝑀𝐹 = 𝑅 𝑓 𝐵 ∗ 3600 ℎ𝑝𝑣𝑠

02 Mat 02 ateri rial al & & Meth thod od 𝜍 𝑏 𝜍 𝑏  Evaluation on of of the C Coo ooling g Effect ℎ 𝑑 𝑏 (4) 𝑛 𝑏 = 𝜍 𝑏 𝐵ℎ 𝑀𝐹 (5) 𝛦𝑈 = 𝑑 𝑏 𝑛 𝑏 Cooling Effect (Du et al., 2016);

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

03 03 Resu sult lts s an and Dis iscuss ssio ion  The resu sult of the v verification for 𝑓𝑤𝑏𝑞𝑝𝑠𝑏𝑢𝑗𝑝𝑜 𝑛𝑝𝑒𝑓𝑚 𝐹 ∗ =(0.01127+0.00432W)(ewater−eair) (4)

03 03 Resu sult lts s an and Dis iscuss ssio ion  Evaluation on the coo ooling g effect Mean 54.63 W/ ㎡ Max 131.71 W/ ㎡ Min 24.68 W/ ㎡

03 03 Resu sult lts s an and Dis iscuss ssio ion  Evaluation on the coo ooling g effect (Unit: ℃) 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

04 04 Conclu Co lusi sion on  Summary  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 of 200 m)

04 04 Conclu Co lusi sion on  Limitation on and Fu Future rese search  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 on of sto torag age heat at  Applicat ation to to va various site tes

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

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