Research on mitigation of the urban heat island phenomenon by external insulation
(Part2) Monitoring and verification on the effects of retrofitting with an external insulation layer
( )
Hideki SHIBAIKE Hideumi WAKI
Kyoto Institute of Technology
The purpose of this study is to illustrate performances of external insulation systems for mitigation of the Urban Heat Island phenomenon. Monitored heat balances on two horizontal roofs refurbished by vulcanized rubber membrane are presented. One has an exterior insulation layer of PE form in 0.03 m thickness and the other has none. Correlations between measured and simulated convective heat fluxes are in an acceptable range. In the sunny daytime, the convective heat release is increased for the exterior insulation roof by 20.8 W/m². In the nighttime, the convective heat flux is captured for the exterior insulation roof.
1
( UHI )
1
UHI
UHI
UHI
2
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T-CC (2 )
[( ) 資料A2 空気調和・衛生工学会近畿支部学術研究発表会論文集（201３年3月）
Figure.3 Correlation between measured and estimated convective heat fluxes
RTR-53] (Figure.1)
1
( 0.91m) ( 8.4%
76.7%)
× 1)
4
No.14(CFS: ) No.11(EIFS: ) Table.2~3 (Figure.3)
Figure.4~7
EIFS 6.1K
20.8W/m² 40.8W/m²
UHI
5
× WUFI
Pro Ver5.12)
No.1~19 WUFI Pro
CFS EIFS
Incident solar radiation (W/m²) 386.4 334.2 Longwave net radiation -136.4 -111.9 Outdoor air temperature (K) 19.7 22.1
Surface temperature 27.3 33.4
Equation.(1) (W/m²) -96.8 -117.6
Equation.(2) -109.1 -149.9
Equation.(1), W/m² -0.9 20.0
Equation.(2), W/m² 3.2 49.8
Run# Measuring Period Section Interval (m) No.01 08/29 16:00 ~ 08/31 18:17 E1.BLD 1 No.02 08/31 18:30 ~ 09/03 16:30 E2.BLD 1 No.03 09/11 17:00 ~ 09/12 14:20 E2.BLD 1 No.04 09/12 14:50 ~ 09/14 11:50 E2.BLD 10 No.05 09/14 12:10 ~ 09/14 19:31 E2.BLD 1 No.06 09/14 19:50 ~ 09/15 14:00 E2.BLD 10 No.07 09/25 14:20 ~ 09/15 17:30 E2.BLD 10 No.08 09/25 20:00 ~ 09/28 07:50 E2.BLD 10 No.09 10/03 14:15 ~ 10/03 18:32 E2.BLD 1 No.10 10/03 19:30 ~ 10/07 23:20 E2.BLD 10 No.11 10/08 18:10 ~ 10/15 14:10 E2.BLD 10 No.12 10/15 14:40 ~ 10/16 16:00 E2.BLD 10 No.13 10/16 16:30 ~ 10/20 04:10 E1.BLD 10 No.14 10/20 14:50 ~ 10/25 19:20 E1.BLD 10 No.15 10/25 19:40 ~ 10/29 01:50 E1.BLD 10 No.16 10/29 12:20 ~ 11/04 03:10 E1.BLD 10 No.17 11/05 19:10 ~ 11/10 17:30 E1.BLD 10 No.18 11/10 18:00 ~ 11/15 03:30 E1.BLD 10 No.19 11/16 12:30 ~ 11/20 20:00 E1.BLD 10
Table.1 Measurement schedule
Figure.1 Measuring devices
Table.2 Diurnal averages of measured items for sunny days
Table.3 Nocturnal averages of measured items for sunny days
Figure.2 Retrofitted roof sections with and without exterior insulation layer E2 EIFS
E1 CFS
CFS EIFS
Figure.4 Incident and reflected solar radiation
0""
200""
400""
600""
800""
10/20" 10/22" 10/24" 10/26"
Radia%on(W/m²)
mm/dd
Incident"solar"radia5on"
Refrected"solar"radia5on"
Figure.5 Longwave net radiation and storage heat flux
8400""
8200""
0""
200""
400""
10/20" 10/22" 10/24" 10/26"
(W/m²)
mm/dd
Longwave"net"radia5on"
Storage"heat"flux"
Figure.6 Surface and outdoor air temperature
0""
20""
40""
60""
10/20" 10/22" 10/24" 10/26"
Temperature(K)
mm/dd
Surface"temperature"
Outdoor"air"temperature"
Figure.7 Measured and eq.(2) values of sensible heat flux
8800""
8600""
8400""
8200""
0""
200""
10/20" 10/22" 10/24" 10/26"
Sensible9heat9flux9(W/m²)
mm/dd
Measured" Eq.(2)"
0""
200""
400""
600""
800""
10/09" 10/11" 10/13" 10/15"
Radia%on(W/m²)
mm/dd9
Incident"solar"radia5on"
Reflected"solar"radia5on"
8400""
8200""
0""
200""
400""
10/09" 10/11" 10/13" 10/15"
(W/m²)
mm/dd
Longwave"net"radia5on"
Storage"heat"flux"
0""
20""
40""
60""
10/09" 10/11" 10/13" 10/15"
Temperature(K)
mm/dd
Surface"temperature"
Outdoor"air"temperature"
8800""
8600""
8400""
8200""
0""
200""
10/09" 10/11" 10/13" 10/15"
Sensible9heat9flux9(W/m²)
mm/dd
Measured" Eq.(2)"
CFS EIFS
CFS EIFS
CFS EIFS
CFS EIFS
Figure.9 Correlation between measured and simulated convective heat fluxes
Figure.10 Simulated temporal profiles of heat release amounts including HVAC energy consumptions for two retrofitted roofs Jurges
( ) (1.6)
2.2
0.7 0.8
2010~12 3
Figure.8 No.14,11
WUFI Pro Figure.9
( )
Figure.10
(1+1/COP) 6
UHI WUFI Pro
UHI
1) 12
632 pp.1209-1215 2008.
2) H.M. Künzel Simultaneous heat and moisture transport in building components Dissertation. Stuttgart: Univ. of Stuttgart 1994.
3) 4 6
2006.
8400""
8200""
0""
200""
10/9" 10/11" 10/13" 10/15"
Sensible9heat9flux(W/m²)9
mm/dd9
Calculated" Measured"
8400""
8200""
0""
200""
10/20" 10/22" 10/24" 10/26"
Sensible9heat9flux(W/m²)9
mm/dd9
Calculated" Measured"
Figure.8 Measured and WUFI calculated series of sensible heat flux for CFS
y"="0.6309x"
R²"="0.65019
8600""
8400""
8200""
0""
200""
8600"" 8400"" 8200"" 0"" 200""
Calculated9(W/m²)9
Measured9(W/m²)99
y"="1.3146x"
R²"="0.97013
8600"" 8400"" 8200""Measured9(W/m²)990"" 200""
CFS EIFS
850""
0""
50""
100""
150""
200""
250""
300""
00:00" 06:00" 12:00" 18:00" 00:00"
Exhausted9Heat9Flux9(W/ m²)9
hh:mm9
EIFSo" CFSo"
COP=4.5
CFS EIFS
