Hi, Ryan
You should post the full paper by Dr. Ooi for the group, if he does not object.
Dr. Ooi may be responding to your specific questions in the short reply below.
The ground temperature data are in the .stat file with the TMY data for both Sweden and Singapore.
However, Sweden is seasonal and building requires heating in Winter. There is no heating requirement in Singapore. Naturally vented building has no HVAC equipment So please read with care.
The suggestions in my previous post was also not completely explained, because only the latitude was used for the cosine law without saying why. The profile was due to the tilt of the earth axis, from the obiting plane which gives the Summer and Winter conditions. I simplified the calculation by using the difference which has two variables.
For detailed research, one looks at many other factors as well, such as ocean current direction, the relation of the location on the land mass, wet and dry raining seasons, etc. Dr. Ooi researched on many of these and may not have included all of them in the published paper.
There is no one simple rule for multi location use. Changing the name of the topic will not get you a quick answer.
When you are designing a lake side Summer cottage in Canada do you really need to simulate it with annual TMY?
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: azianzheep@xxxxxxxxx
Date: Sun, 20 Jan 2013 19:53:04 +0000
Subject: [EnergyPlus_Support] Re: Ground temperature of Singapore
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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You should post the full paper by Dr. Ooi for the group, if he does not object.
Dr. Ooi may be responding to your specific questions in the short reply below.
The ground temperature data are in the .stat file with the TMY data for both Sweden and Singapore.
However, Sweden is seasonal and building requires heating in Winter. There is no heating requirement in Singapore. Naturally vented building has no HVAC equipment So please read with care.
The suggestions in my previous post was also not completely explained, because only the latitude was used for the cosine law without saying why. The profile was due to the tilt of the earth axis, from the obiting plane which gives the Summer and Winter conditions. I simplified the calculation by using the difference which has two variables.
For detailed research, one looks at many other factors as well, such as ocean current direction, the relation of the location on the land mass, wet and dry raining seasons, etc. Dr. Ooi researched on many of these and may not have included all of them in the published paper.
There is no one simple rule for multi location use. Changing the name of the topic will not get you a quick answer.
When you are designing a lake side Summer cottage in Canada do you really need to simulate it with annual TMY?
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: azianzheep@xxxxxxxxx
Date: Sun, 20 Jan 2013 19:53:04 +0000
Subject: [EnergyPlus_Support] Re: Ground temperature of Singapore
Hi Group,
I would like to post a recommendation Dr. Ooi sent to me privately. For me, THIS is the answer I was looking for. An easy and systematic way to find the ground temperature for unconditioned buildings. I think Dr. Ooi will not mind me sharing this email:
----------------------------------------------------------
Hi,
For indoors that are not conditioned, you can use the 12 monthly average ground temperatures in the stat file, which is one of the 3 files that comes with the download of .zip weather file. These IWEC weather files are available for Singapore and, i believe Sweden too.
Enter these 12 temperatures for Jan...Dec fields in the Site:GroundTemperature:BuildingSurface object.
Of course there is daily fluctuation of temperature, but for the ground, this is not much
For buildings that are not conditioned, there is no need to use the Slab utitlity.
Hope this helps
ooi
----------------------------------------------------------
In case anyone doesn't know, Dr. Ooi has done a lot of research on EnergyPlus ground temperatures. He has written a paper on it and is the author of the EneryPlus excercises "3D heat transfer with ground" for introducing ground modelling.
So I open it up to the Yahoo Group to decide if this is CASE CLOSED for ground temperatures for unconditioned buildings. Or we can discuss Dr. Ooi's recommendation and compare it to your own methodology.
I looked into the STAT monthly averages, they are supposedly the 0.5 m depth ground temperature. Although when I tried calculating that using the Hillel (1982) method, I got a slightly different result.
Ryan
I would like to post a recommendation Dr. Ooi sent to me privately. For me, THIS is the answer I was looking for. An easy and systematic way to find the ground temperature for unconditioned buildings. I think Dr. Ooi will not mind me sharing this email:
----------------------------------------------------------
Hi,
For indoors that are not conditioned, you can use the 12 monthly average ground temperatures in the stat file, which is one of the 3 files that comes with the download of .zip weather file. These IWEC weather files are available for Singapore and, i believe Sweden too.
Enter these 12 temperatures for Jan...Dec fields in the Site:GroundTemperature:BuildingSurface object.
Of course there is daily fluctuation of temperature, but for the ground, this is not much
For buildings that are not conditioned, there is no need to use the Slab utitlity.
Hope this helps
ooi
----------------------------------------------------------
In case anyone doesn't know, Dr. Ooi has done a lot of research on EnergyPlus ground temperatures. He has written a paper on it and is the author of the EneryPlus excercises "3D heat transfer with ground" for introducing ground modelling.
So I open it up to the Yahoo Group to decide if this is CASE CLOSED for ground temperatures for unconditioned buildings. Or we can discuss Dr. Ooi's recommendation and compare it to your own methodology.
I looked into the STAT monthly averages, they are supposedly the 0.5 m depth ground temperature. Although when I tried calculating that using the Hillel (1982) method, I got a slightly different result.
Ryan
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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