When you are doing building design research, it is not necessary to do the full annual weather file simulation and to get the monthly reports.
I always use the 5 zone model to determine the intensity of the external loading. If you have displayed the surface temperature, and window heat gain/loss rate, you may spotted the difference right away.
Internal loads can be viewed by displaying report variable schedule values. These only needs to be displayed once to make sure that the schedules and the object values are correctly entered. I noticed that you are using the seasonal control. If you are not using water plant based design, the type 4 thermostat control will give you more comfort and saving during the transition season days.
Then you can concentrate of the building surfaces and window orientation and shades.
I use the ventilation object as the alternative to using full AFN, and the use of economizer in HVAC. If the indoor temperature does not exceed the OD temperature in the hottest day, the building will not need HVAC for cooling. Heating is usually a matter of good insulation.
The design of your building is very good. Maximum window exposure to the South. Minimum to the North and West. The building ground temperature was set at 18°C. This will help to lower the temperature in Summer.
Glad to know that good insulation do reduce energy usage. I believe that the use of air conditioning equipment for cooling should be slowly eliminated in the new buiding design. Special purpose buildings may have air-conditioning, and it should not be one standard for all.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Mon, 30 Jul 2012 11:32:18 -0700
Subject: Re: [EnergyPlus_Support] Problem with low heting values from e+
From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Monday, July 30, 2012 7:25 PM
Subject: RE: [EnergyPlus_Support] Problem with low heting values from e+
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Primary EnergyPlus support is found at:
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The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
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I always use the 5 zone model to determine the intensity of the external loading. If you have displayed the surface temperature, and window heat gain/loss rate, you may spotted the difference right away.
Internal loads can be viewed by displaying report variable schedule values. These only needs to be displayed once to make sure that the schedules and the object values are correctly entered. I noticed that you are using the seasonal control. If you are not using water plant based design, the type 4 thermostat control will give you more comfort and saving during the transition season days.
Then you can concentrate of the building surfaces and window orientation and shades.
I use the ventilation object as the alternative to using full AFN, and the use of economizer in HVAC. If the indoor temperature does not exceed the OD temperature in the hottest day, the building will not need HVAC for cooling. Heating is usually a matter of good insulation.
The design of your building is very good. Maximum window exposure to the South. Minimum to the North and West. The building ground temperature was set at 18°C. This will help to lower the temperature in Summer.
Glad to know that good insulation do reduce energy usage. I believe that the use of air conditioning equipment for cooling should be slowly eliminated in the new buiding design. Special purpose buildings may have air-conditioning, and it should not be one standard for all.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Mon, 30 Jul 2012 11:32:18 -0700
Subject: Re: [EnergyPlus_Support] Problem with low heting values from e+
Dear Dr Li! yes i do have
the e+ v6 file.
the only difference for
this file is the multi core field and the minimum iterations on building field (that have been removed from v7
file to be able to run it one the v6).
This building is not a real one
case. it is the base of a modelling concept so that's why it is in this simple
form for the moment.
The weird in this file is that in
one zone there are no heating loads for winter months. this is unrealistic the
B,C,D and E climate zones of Greece.
I tried to give a very big
infiltration rate 3 ach just to test it but still the same problem.
I made some test without
internal gains, without windows, without heating systems just to see the
temperatures, I remover the insulation and still the house does not give
realistic results.
T
hank you for your time
Dear Jeremiah
This are good modifications
but i have to find the problem on the simple model at the moment so to be able
to understand the reason of such a behavior. As for the v6 version it gives
about the same results.
Thank you for your time
Best regards
K.O.
From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Monday, July 30, 2012 7:25 PM
Subject: RE: [EnergyPlus_Support] Problem with low heting values from e+
Do you still have the IDF in Version 6.0? I know that the input format has change for many objects in version 7.10. Just curious.
The number I gave you was for one floor. Two floors together would be about 3.0 kw for heating or cooling.
It is not very practical to use a single zone building for solar related study. Monthly report is also not very suitable to find simulation problems.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Sun, 29 Jul 2012 14:42:31 -0700
Subject: Re: [EnergyPlus_Support] Problem with low heting values from e+
From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Sunday, July 29, 2012 10:10 PM
Subject: RE: [EnergyPlus_Support] Problem with low heting values from e+
The number I gave you was for one floor. Two floors together would be about 3.0 kw for heating or cooling.
It is not very practical to use a single zone building for solar related study. Monthly report is also not very suitable to find simulation problems.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Sun, 29 Jul 2012 14:42:31 -0700
Subject: Re: [EnergyPlus_Support] Problem with low heting values from e+
Dear Dr. Li
Thank you for your answer. I agree with your results but a house as this one in
Greece
is expected to have mach more heating capacity from the calculated (5-8 kW system).In other buildings
simulation (but in version 6 of e+) I had no problems with the results but in this one I cannot accept
so low heating capacity as a correct values. I have discussed this problem with
some other e+ users in Greece
and they had the same problem but could not find the reason.
So I'm looking either an error of mine or something that I could not find at this stage.
From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Sunday, July 29, 2012 10:10 PM
Subject: RE: [EnergyPlus_Support] Problem with low heting values from e+
I did not look at the IDF in detail. The simmulation with the DesignDay objects added was error free.
The summary report showed the floor area as 72 m2. The heating and cooling rates were around 1.5 kw for the Winter and SUmmer design days.. These capacity can be met with a portable unit.
You were using annual simulation, and the result simply means that you may not need HVAC system.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
CC: kontante@xxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Sun, 29 Jul 2012 09:16:04 -0700
Subject: [EnergyPlus_Support] Problem with low heting values from e+
The summary report showed the floor area as 72 m2. The heating and cooling rates were around 1.5 kw for the Winter and SUmmer design days.. These capacity can be met with a portable unit.
You were using annual simulation, and the result simply means that you may not need HVAC system.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
CC: kontante@xxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Sun, 29 Jul 2012 09:16:04 -0700
Subject: [EnergyPlus_Support] Problem with low heting values from e+
Dear E+ users
I
am having problem to understand why e+ gives very low heating values to the
attached model.
It's a simple 2floor domestic house with an ideal system and
some classic internal load (people, lights, equipment) and an infiltration.
The results give a value of 0.07 kWh/m2 witch is not realistic. I have checked
the internal load, I have changed a climate files but still cannot get
realistic values.
The only thing that I can imagine is the thermal mass
but I have checked the material properties as well could you suggest any
other parameter that I might have not check, or if you had a similar problem to
propose me a solution
Thank you in regards
K.O.
__._,_.___
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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