Greening scenarios - hottest temperature

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architectureiraqaws
Posts: 2
Joined: Wed Feb 22, 2017 9:47 pm

Greening scenarios - hottest temperature

Postby architectureiraqaws » Sat Mar 25, 2017 9:02 am

Hi all,

I have been simulated 3 scenarios for my case study area in Baghdad, Iraq. The first scenario was no green area. I removed all green area. The second scenario was green area as the green area in my case study. The third scenario was more green area. I put more trees around the street. (scenario a = no green , scenario b = green , scenario c = more green )

When simulation done, I found some area in scenarios b and c (green and more green) is hottest then scenario a (no green). I want to know which step or parameters are wrong.

The following files contain my input data, simfile and result map.

Kind Regards,

Aws M. Salman,
Post graduate student,
Architecture Engineering Department, UoT
10066, Baghdad, Iraq.


My input data:
Area 50 *50*18
Grid size 2*2*1
Height for building ----- max = 8m ---- min = 3m
Wall ----- brick aerated ----- thickness 0.3 ----- thermal conductivity 0.3 w/m*k ---- albedo 0.3
Roof ---- Concrete: cast dense --- thickness 0.3 ---- thermal conductivity 1.9 w/m*k ---- albedo 0.3
street ----- asphalt ----- albedo 0.2
pavement ---- concrete pavement gray ---- albedo 0.5
number of nesting grid = 3
soil profile for nesting grid = 00 default unsealed soil
model rotation out of grid north = 45
vegetation ---- simple plant grass 10 cm ---- 3D plants ( tree1 = 3*3*5 height=5m , tree2 = 7*7*8 height=8m , tree3 = 9*9*7 height=7m)
tree1 ---- Citrus Aurantium --- foliage albedo 0.4
tree2 ---- Palm ---- foliage albedo 0.18
tree2 ---- Koelieuteria paniculata laxm ----- foliage albedo 0.7

Simfile :
%---- ENVI-met V4 main configuration file --------------------------
%---- generated with ProjectWizard ----------------------------------
Fileversion =4.0
JobID =Simulation
% Main data .........................................................
Name for Simulation (Text): =area1_green
Area Input File to be used =NewArea.INX
Filebase name for Output (Text): =area1_green
Output Directory: =
Start Simulation at Day (DD.MM.YYYY): =15.07.2015
Start Simulation at Time (HH:MM:SS): =05:00:00
Total Simulation Time in Hours: =44
Wind Speed in 10 m ab. Ground [m/s] =2.0
Wind Direction (0:N..90:E..180:S..270:W..) =315
Roughness Length z0 at Reference Point [m] =0.1
Initial Temperature Atmosphere [K] =315.250
Specific Humidity in 2500 m [g Water/kg air] =7.0
Relative Humidity in 2m [%] =20
% End main data .....................................................
[OUTPUTTIMING]_____________________________________
Output interval main files (min) =60.00
Output interval log files (min) =30.00
Include Nesting Grids in Output (0:n,1:y) =0
[SOLARADJUST] _____________________________________
Factor of shortwave adjustment (0.5 to 1.5) =0.90
[SOILDATA] ______________________________________
Initial Temperature Upper Layer (0-20 cm) [K]=310.00
Initial Temperature Middle Layer (20-50 cm) [K]=300.00
Initial Temperature Deep Layer (below 50 cm)[K]=293.00
Relative Humidity Upper Layer (0-20 cm) =10.00
Relative Humidity Middle Layer (20-50 cm) =50.00
Relative Humidity Deep Layer (below 50 cm) =60.00
[SIMPLEFORCE] _____________________________________
Hour 00h [Temp, rH] = 312.25, 17.00
Hour 01h [Temp, rH] = 309.75, 18.00
Hour 02h [Temp, rH] = 308.25, 18.00
Hour 03h [Temp, rH] = 308.25, 18.00
Hour 04h [Temp, rH] = 307.25, 17.00
Hour 05h [Temp, rH] = 306.75, 17.00
Hour 06h [Temp, rH] = 308.25, 16.00
Hour 07h [Temp, rH] = 311.25, 14.00
Hour 08h [Temp, rH] = 314.75, 13.00
Hour 09h [Temp, rH] = 316.25, 12.00
Hour 10h [Temp, rH] = 318.25, 10.00
Hour 11h [Temp, rH] = 319.25, 10.00
Hour 12h [Temp, rH] = 320.75, 8.00
Hour 13h [Temp, rH] = 322.25, 7.00
Hour 14h [Temp, rH] = 322.75, 7.00
Hour 15h [Temp, rH] = 322.75, 7.00
Hour 16h [Temp, rH] = 321.75, 7.00
Hour 17h [Temp, rH] = 320.75, 7.00
Hour 18h [Temp, rH] = 320.75, 7.00
Hour 19h [Temp, rH] = 318.25, 8.00
Hour 20h [Temp, rH] = 315.75, 9.00
Hour 21h [Temp, rH] = 314.75, 12.00
Hour 22h [Temp, rH] = 313.25, 12.00
Hour 23h [Temp, rH] = 311.75, 13.00
[LBC-TYPES] _______________________________________
LBC for T and q (1:open, 2:forced, 3:cyclic) =2
LBC for TKE (1:open, 2:forced, 3:cyclic) =2
[LBC-TYPES] _______________________________________
LBC for T and q (1:open, 2:forced, 3:cyclic) =2
LBC for TKE (1:open, 2:forced, 3:cyclic) =2
Attachments
scenario  c - more green.jpg
scenario c - more green.jpg (231.14 KiB) Viewed 174 times
scenario  b -  green.jpg
scenario b - green.jpg (227.55 KiB) Viewed 174 times
scenario  a - no green.jpg
scenario a - no green.jpg (218.5 KiB) Viewed 174 times

architectureiraqaws
Posts: 2
Joined: Wed Feb 22, 2017 9:47 pm

Re: Greening scenarios - hottest temperature

Postby architectureiraqaws » Sat Mar 25, 2017 9:14 am

I think my problem is the albedo of trees which I left it as the default

enviadmin
Site Admin
Posts: 1594
Joined: Wed Dec 27, 2006 11:00 pm
Location: Essen/ Germany
Contact:

Re: Greening scenarios - hottest temperature

Postby enviadmin » Sun Mar 26, 2017 10:37 am

You must analyse the fluxes and in particular the wind speed to find an answer to your question

Michael


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