Hi, Jason
I was only pointing out your matching and what I was doing were all ways to find the differences between the roof and ground floor.
I did mention that if your match worked, then the 2 and 4 floors are not required.
Adding 2 and 4 floors are just ways of getting more information from the building. Roof is solar radiation dependent, ground is effected by ground cooling and basement. Attic may actually be the top floor. There may be equipment up there as well. Building ground surface temperature is unknown. (a monthly average number or zone temperature minus two degrees.) The different may be too large, so I added two buffer floors.
Sorry, if you think I was disagreeing with your method.
After you have the IDF, you can always load it in the SketchUp and get a builtiful picture.
I hae not mentioned any coding method, as there are so many different alternatives for the floors and ceilings.
You can even use IdealLoadsAirSystem for the mid floors and multiply with an nefficiency number to get a quick answer.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jason.alan.kirkpatrick@xxxxxxxxx
Date: Mon, 21 Nov 2011 11:42:26 -0800
Subject: Re: [EnergyPlus_Support] Re: What is the best modelling strategy ? I need help to clarify this issue!!!
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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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I was only pointing out your matching and what I was doing were all ways to find the differences between the roof and ground floor.
I did mention that if your match worked, then the 2 and 4 floors are not required.
Adding 2 and 4 floors are just ways of getting more information from the building. Roof is solar radiation dependent, ground is effected by ground cooling and basement. Attic may actually be the top floor. There may be equipment up there as well. Building ground surface temperature is unknown. (a monthly average number or zone temperature minus two degrees.) The different may be too large, so I added two buffer floors.
Sorry, if you think I was disagreeing with your method.
After you have the IDF, you can always load it in the SketchUp and get a builtiful picture.
I hae not mentioned any coding method, as there are so many different alternatives for the floors and ceilings.
You can even use IdealLoadsAirSystem for the mid floors and multiply with an nefficiency number to get a quick answer.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jason.alan.kirkpatrick@xxxxxxxxx
Date: Mon, 21 Nov 2011 11:42:26 -0800
Subject: Re: [EnergyPlus_Support] Re: What is the best modelling strategy ? I need help to clarify this issue!!!
The reason I was saying to do the surface matching in the way that I specified was along the lines of what Jean was saying:
EnergyPlus doesnt actually duplicate the multiplied floor, it just multiplies out the loads. from a solar standpoint, (I think) it just makes the zone x number times bigger in the X and Y directions. for this reason, if you match a multiplied floor surface with a non-multiplied floor surface, you will get errors due to non matching floor areas that do not satisfy the conservation of energy. therefore if I use a floor multiplier and want to match the floor and want to account for heat transfer between floors, I want to make sure that my multiplied floors ceiling is matched to the multiplied floors floor.
Since the ground floor ceiling and top floor floor are not being multiplied, they make a good match for each other IF the loads / temperatures are similar to the rest of the building.
As for visual display for presentations, I agree with Jim that it's helpful to duplicate the multiplied floor in order to take a screenshot image that looks like the real building without multipliers. Sometimes with detailed models it is helpful to just duplicate the perimeter and plenum zones so as to not bog down the GUI (openstudio, designbuilder, etc)
EnergyPlus doesnt actually duplicate the multiplied floor, it just multiplies out the loads. from a solar standpoint, (I think) it just makes the zone x number times bigger in the X and Y directions. for this reason, if you match a multiplied floor surface with a non-multiplied floor surface, you will get errors due to non matching floor areas that do not satisfy the conservation of energy. therefore if I use a floor multiplier and want to match the floor and want to account for heat transfer between floors, I want to make sure that my multiplied floors ceiling is matched to the multiplied floors floor.
Since the ground floor ceiling and top floor floor are not being multiplied, they make a good match for each other IF the loads / temperatures are similar to the rest of the building.
As for visual display for presentations, I agree with Jim that it's helpful to duplicate the multiplied floor in order to take a screenshot image that looks like the real building without multipliers. Sometimes with detailed models it is helpful to just duplicate the perimeter and plenum zones so as to not bog down the GUI (openstudio, designbuilder, etc)
__._,_.___
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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