When using IdealLoadsAirSystem, real equipment are not involved.
In fact I never use real HVAC equipment, because any equipment added would use more energy than that with IdealLoadsAirSystem calculation.
In Singapore, I do not need to worry about heating. Therefore, roof design, external shades and equipment heat control are the main factors. I do not need to follow the ASHRAE comfort guideline.
The final design in my work is always with no HVAC equipment for the building.
I do not consider the use of renewable energy as environment friendly.
Directly solar heating for DHW, as example, is "green" energy. Solar PV pannels has already a lot of energy used in the manufacturing process, and is less 'Green".
========================
There are many useful information in the Summary report to verify the building size, material used, construction, facing direction, etc. When you have building related errors, the HTML file is where you can spot the problems. (incorrect vertor direction. Small wall pieces added by the third party software. )
When you are in the phase of checking the schedules, controllers, etc. The timestep values should be used. Simplify the controls and schedules used in simulation. I can have four variations of a schedule in each simulation, using the four seasons. The names does not matter. The OD temperature used determine whether you are in cooling or heating mode.
The Winter and Summer design day Data cover only the two extreme conditions. That is the reason why I added the Custom1 and Custom2 for the Spring and Autumn conditions.
I know that the rain and snow flags in the DesignDay object do not represent the real situation. You need to look for the different combinations in the weather file. Add three days before the selected days in order to allow the initialization to settle, or do a multiple repeat in the same simulation to verify the results.
====================
Regarding the sizing information in the table report, do use with care. Some are autosized, some are clculated and some are user entered values.
Many fields in the table report are zero, until an annual simulation is run successfully.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: kwalkerman@xxxxxxxxx
Date: Sun, 13 Nov 2011 10:25:37 -0500
Subject: Re: [EnergyPlus_Support] zone load simulation with energy plus
__._,_.___
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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__,_._,___
In fact I never use real HVAC equipment, because any equipment added would use more energy than that with IdealLoadsAirSystem calculation.
In Singapore, I do not need to worry about heating. Therefore, roof design, external shades and equipment heat control are the main factors. I do not need to follow the ASHRAE comfort guideline.
The final design in my work is always with no HVAC equipment for the building.
I do not consider the use of renewable energy as environment friendly.
Directly solar heating for DHW, as example, is "green" energy. Solar PV pannels has already a lot of energy used in the manufacturing process, and is less 'Green".
========================
There are many useful information in the Summary report to verify the building size, material used, construction, facing direction, etc. When you have building related errors, the HTML file is where you can spot the problems. (incorrect vertor direction. Small wall pieces added by the third party software. )
When you are in the phase of checking the schedules, controllers, etc. The timestep values should be used. Simplify the controls and schedules used in simulation. I can have four variations of a schedule in each simulation, using the four seasons. The names does not matter. The OD temperature used determine whether you are in cooling or heating mode.
The Winter and Summer design day Data cover only the two extreme conditions. That is the reason why I added the Custom1 and Custom2 for the Spring and Autumn conditions.
I know that the rain and snow flags in the DesignDay object do not represent the real situation. You need to look for the different combinations in the weather file. Add three days before the selected days in order to allow the initialization to settle, or do a multiple repeat in the same simulation to verify the results.
====================
Regarding the sizing information in the table report, do use with care. Some are autosized, some are clculated and some are user entered values.
Many fields in the table report are zero, until an annual simulation is run successfully.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: kwalkerman@xxxxxxxxx
Date: Sun, 13 Nov 2011 10:25:37 -0500
Subject: Re: [EnergyPlus_Support] zone load simulation with energy plus
Hi Dr. Lee,
Good point about running files only for the design day. Often when I am trouble-shooting I run a file only for the design days, or sometimes, once the file is free of errors, but still not operating the way I want, I run one week in each season.
Regarding summary reports: In addition
On Sunday, November 13, 2011, YuanLu Li <yli006@xxxxxxxxxxx> wrote:
>
>
> Good suggestion, Karen.
>
> However, I am not sure what are displayed in the summary report when only running the designDay simulation. The table will show the total values of a week, month or a year..
>
> Summary report are not useful for looking at building eneragy usage performance details, such as heat through a window due to solar radiation at different time of a day.
>
> Summary report is useful for user interested in long term annual or monthly energy usage, such as a LEED certificate.
>
> The summary report would show heating and cooling eneray usage at different columns or rows, but there is no information on when they were used at detailed time step level.
>
> I use DesignDay simulation most of the time, and the simulation is set up for the four selected days which represent the four seasons.
>
> When I receive and IDF from this group, the first thing I do is to change the run control to run DesignDay only. Almost 100% of the IDF are running in weather file mode. It is wast of time to run an annual simulation, while the IDF is still full or warnings and errors.
>
> I do not need a weather file for the location, when running only DesignDay simulation.
>
> Dr. Li
>
>
> ________________________________
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: kwalkerman@xxxxxxxxx
> Date: Sat, 12 Nov 2011 19:28:48 -0500
> Subject: Re: [EnergyPlus_Support] zone load simulation with energy plus
>
>
> I also recommend running your simulation for heating and cooling design days and looking at the summary reports. You'll need to create an output object in order for the simulation to create the summary report:
>
> Output:Table:SummaryReports,AllSummary,,,,,,,,,,,,,,;
> --
> Karen
>
> On Sat, Nov 12, 2011 at 6:39 PM, Bei Zhang <darkeyes_bz@xxxxxxxxx> wrote:
>
>
>
> Dr.Li,
> thank you very much!
>
> ________________________________
> From: YuanLu Li <yli006@xxxxxxxxxxx>
> To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
> Sent: Saturday, November 12, 2011 12:09 PM
> Subject: RE: [EnergyPlus_Support] zone load simulation with energy plus
>
>
> If you display hourly output values, the displayed number is averaged over the previous hour period.
>
> In a cold night, the system is heading the zone in the morning just before the sun comes out. The sun beam entering the building through a window can increase the temperature very fast, at 440W per square meter of window area. When this is happinging during the same reporting hour period, it is normal to see heating and cooling values at the same time.
>
> With shorter timestep reporting periods, you may see the values not displayed in the same period.
>
> I am not sure of the exact variable name. Zone heating rate and zone cooling rate display the heating and cooling power required to heat and cool the zone to the theremsstat set temperature. They are in the .rdd file.
>
> Dr. Li
>
>
> ________________________________
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: darkeyes_bz@xxxxxxxxx
> Date: Sat, 12 Nov 2011 16:26:34 +0000
> Subject: [EnergyPlus_Support] zone load simulation with energy plus
>
>
> Hello,
> I want to use energy plus to simulate the thermal load of a multiple zone building.
> Currently in the HVAC templates, I built a HVAVtemplate:Thermostat and five HVAVtemplate:zone:IdealLoadAirSystem for five zones.
> SO in the output:variable, which variable describes the thermal load of each zone?
> Is that the Ideal loads air heating rate/ ideal loads air cooling rate? I am not sure whether I should use this, since I found that even for an individual zone, there could be a heating rate and cooling rate at the same time at certain time period.
> Thank you very much!
>
>
>
>
>
>
>
>
>
Good point about running files only for the design day. Often when I am trouble-shooting I run a file only for the design days, or sometimes, once the file is free of errors, but still not operating the way I want, I run one week in each season.
Regarding summary reports: In addition to providing yearly energy use, they also provide sizing summaries for each piece of equipment in the model, which would be helpful to the original poster.
--
Karen
Regarding summary reports: In addition
On Sunday, November 13, 2011, YuanLu Li <yli006@xxxxxxxxxxx> wrote:
>
>
> Good suggestion, Karen.
>
> However, I am not sure what are displayed in the summary report when only running the designDay simulation. The table will show the total values of a week, month or a year..
>
> Summary report are not useful for looking at building eneragy usage performance details, such as heat through a window due to solar radiation at different time of a day.
>
> Summary report is useful for user interested in long term annual or monthly energy usage, such as a LEED certificate.
>
> The summary report would show heating and cooling eneray usage at different columns or rows, but there is no information on when they were used at detailed time step level.
>
> I use DesignDay simulation most of the time, and the simulation is set up for the four selected days which represent the four seasons.
>
> When I receive and IDF from this group, the first thing I do is to change the run control to run DesignDay only. Almost 100% of the IDF are running in weather file mode. It is wast of time to run an annual simulation, while the IDF is still full or warnings and errors.
>
> I do not need a weather file for the location, when running only DesignDay simulation.
>
> Dr. Li
>
>
> ________________________________
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: kwalkerman@xxxxxxxxx
> Date: Sat, 12 Nov 2011 19:28:48 -0500
> Subject: Re: [EnergyPlus_Support] zone load simulation with energy plus
>
>
> I also recommend running your simulation for heating and cooling design days and looking at the summary reports. You'll need to create an output object in order for the simulation to create the summary report:
>
> Output:Table:SummaryReports,AllSummary,,,,,,,,,,,,,,;
> --
> Karen
>
> On Sat, Nov 12, 2011 at 6:39 PM, Bei Zhang <darkeyes_bz@xxxxxxxxx> wrote:
>
>
>
> Dr.Li,
> thank you very much!
>
> ________________________________
> From: YuanLu Li <yli006@xxxxxxxxxxx>
> To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
> Sent: Saturday, November 12, 2011 12:09 PM
> Subject: RE: [EnergyPlus_Support] zone load simulation with energy plus
>
>
> If you display hourly output values, the displayed number is averaged over the previous hour period.
>
> In a cold night, the system is heading the zone in the morning just before the sun comes out. The sun beam entering the building through a window can increase the temperature very fast, at 440W per square meter of window area. When this is happinging during the same reporting hour period, it is normal to see heating and cooling values at the same time.
>
> With shorter timestep reporting periods, you may see the values not displayed in the same period.
>
> I am not sure of the exact variable name. Zone heating rate and zone cooling rate display the heating and cooling power required to heat and cool the zone to the theremsstat set temperature. They are in the .rdd file.
>
> Dr. Li
>
>
> ________________________________
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: darkeyes_bz@xxxxxxxxx
> Date: Sat, 12 Nov 2011 16:26:34 +0000
> Subject: [EnergyPlus_Support] zone load simulation with energy plus
>
>
> Hello,
> I want to use energy plus to simulate the thermal load of a multiple zone building.
> Currently in the HVAC templates, I built a HVAVtemplate:Thermostat and five HVAVtemplate:zone:IdealLoadAirSystem for five zones.
> SO in the output:variable, which variable describes the thermal load of each zone?
> Is that the Ideal loads air heating rate/ ideal loads air cooling rate? I am not sure whether I should use this, since I found that even for an individual zone, there could be a heating rate and cooling rate at the same time at certain time period.
> Thank you very much!
>
>
>
>
>
>
>
>
>
__._,_.___
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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