Search found 108 matches

by helge
Tue Mar 31, 2020 3:14 pm
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Singwalls and reflected shortwave radiation(IVS on)
Replies: 7
Views: 103

Re: Singwalls and reflected shortwave radiation(IVS on)

Dear Jack, yes, currently we do not differentiate between the two "sides" of single walls in our outputs. The reason you see higher values for reflected SW radiation beneath the single wall is that the sum or reflected sw radiation from the lower hemisphere (mainly ground) is higher than f...
by helge
Thu Feb 06, 2020 10:31 am
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Questions about radiation results
Replies: 13
Views: 124

Re: Questions about radiation results

Dear Benjamin,

what exactly are your boundary conditions? Are you using full forcing? Some of our radiation outputs are relative to a normal surface (always perpendicular to the incoming direct shortwave radiation).

Best
Helge
by helge
Tue Jan 21, 2020 10:12 am
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Formula of PPD
Replies: 8
Views: 105

Re: Formula of PPD

Dear ENVI-met, Thank you both for your answers. Is the calculation result of wind speed in the four indexes of wind speed, temperature, radiation, and PMV more reliable when the temperature is below zero? Best wishes, Pat Dear Pat, in general all newer indices (PET, UTCI) will result in much more r...
by helge
Thu Jan 09, 2020 10:54 am
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Spray water
Replies: 42
Views: 834

Re: Spray water

Dear all,

Thank you very much for your input - this is very helpful for us!
We are have been looking into this issue and ran some test simulations.
Attached you will find an updated preliminary version (the input is in g/s). We are happy to receive feedback from you

Best
Helge
by helge
Mon Dec 09, 2019 10:39 am
Forum: ENVI-met 4 (Main Simulation Model)
Topic: u-value and internal temp. of walls
Replies: 11
Views: 150

Re: u-value and internal temp. of walls

Dear Aaya,

the two walls are hard to compare. Their thickness is very different... How long did your simulation run? Is the building and the building volume inside identical?
We would need some more information.

Best
Helge
by helge
Fri Sep 20, 2019 9:24 am
Forum: Albero
Topic: LAD and percentage of solar radiation transmission
Replies: 1
Views: 110

Re: LAD and percentage of solar radiation transmission

Hi Stella,

the transmittance of direct radiation is calculated using raytracing and a extinction coefficient:

extinctionCoeff = e^(-0.5 * (1-transmittance of leaves) * LAD[x,y,z] * (length of ray))

Best
Helge
by helge
Sat Sep 14, 2019 7:07 am
Forum: LEONARDO 4
Topic: Does Leonardo have the ability to display illuminance?
Replies: 1
Views: 116

Re: Does Leonardo have the ability to display illuminance?

Dear AARRII,

no lux is not simulated sorry

Best
Helge
by helge
Tue Aug 13, 2019 1:40 pm
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Questions on simulations using the full forcing possibility
Replies: 19
Views: 346

Re: Questions on simulations using the full forcing possibility

Dear A-),

Thank you for the feedback we will have a look into it by simulating a small test area and will get back to you.

Best Helge
by helge
Mon Aug 12, 2019 10:57 am
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Questions on simulations using the full forcing possibility
Replies: 19
Views: 346

Re: Questions on simulations using the full forcing possibility

Dear A-) We had a look at your FOX-Files: the 20:00:00 and 20:30:00 values from 02th August were missing. We strongly believe your values are in the "lambert" format. The radiation data is not relative to a horizontal surface but rather to a surface that is always perpendicular to the sun....
by helge
Thu Jul 18, 2019 1:22 pm
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Strange results with DEM implementation.
Replies: 18
Views: 526

Re: Strange results with DEM implementation.

tobiemorak wrote:Dear Helge,
Thanks for your reply
Please uise the link below:

https://www.dropbox.com/sh/4lbuqgu37uko ... IfTna?dl=0

Tobi


Dear Tobi,

thank you for sending the files, I also need you database since the trees are not the system trees :)

Best
Helge
by helge
Thu Jul 18, 2019 1:15 pm
Forum: Albero
Topic: 3D Trees
Replies: 1
Views: 111

Re: 3D Trees

We have a video tutorial for this online:
https://www.youtube.com/watch?v=oQ6a4-Q2hAA

Best
Helge
by helge
Thu Jul 18, 2019 1:11 pm
Forum: Albero
Topic: how to change the LAD value ?
Replies: 2
Views: 113

Re: how to change the LAD value ?

Are you sure you have write access on that drive?

Best
Helge
by helge
Thu Jul 18, 2019 7:40 am
Forum: ENVI-met 4 (Main Simulation Model)
Topic: Strange results with DEM implementation.
Replies: 18
Views: 526

Re: Strange results with DEM implementation.

Dear Tobi,

I have never seen this phenomenon, please try uploading the simx and inx files somewhere and share the link (maybe via wetranfer).

Best
Helge
by helge
Tue Jul 16, 2019 2:08 pm
Forum: LEONARDO 4
Topic: radiation fiels
Replies: 4
Views: 146

Re: radiation fiels

Dear heba,

it depends on what you want to have a look at. If it's all longwave fluxes summed up its: Q_LW sum all fluxes
The fields: Q_LW upper hemisphere, Q_LW lower hemisphere give you the longwave radiation received from the top and bottom half sphere.

Best
Helge
by helge
Tue Jul 16, 2019 2:05 pm
Forum: Beginner's Corner
Topic: Mean Radiant Temperature
Replies: 1
Views: 108

Re: Mean Radiant Temperature

Dear Claudia,

the MRT is calculated by:

tmrt = 4th root of ((1 / bolzman constant) * (longwave received radiation + 0.7 / 0.97 * (diffuse shortwave received radiation+ direct shortwave received radiation))

Best
Helge

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