[EnergyPlus_Support] Re: Design Day V.S. Schedule

["Jean marais" <jeannieboef@xxxxxxxxx>]

Where does eplus take its solar radiation data from for said location every hour?

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> The design day definition is separate from the weather files.  The 
> only thing it will take from the weather file is the location 
> (lat/long/time zone/elevation).
> 
> And whatever other warnings are posted.
> 
> At 12:32 AM 7/13/2011, Jean marais wrote:
> 
> >When specifying the Design Day, I specify quite a few variables that 
> >will "override" the normal weather file variables for specified date 
> >e.g. wind velocity is set to a constant. What I don't see are 
> >options for radiation (4 kinds). Does e+ pull any hourly variables 
> >from the weather file for set date, that are not specified in the 
> >Design Day object?
> >
> >I have thus far assumed this to be the case.
> >
> >--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
> > >
> > >
> > > Hi, QiangMin Table is useful to get an overall view of the 
> > result. Meters, etc. are useful only for those who are interested 
> > in preparing 'Green' reports. Solar loading on the building is a 
> > daily cyclic property.  It cannot be separated into hourly value 
> > from the daily, monthly averaged values.
> > >
> > > This is why I am not very interested in the reports and annual 
> > simulation, when trying to design a comfortable building with 
> > natural ventilation. By the way, there will not be any monthly 
> > results in the table, if you do not do an annual 
> > simulation.========================= I high lighted some fields in 
> > the DesignDay object in the other mail. For your building, because 
> > the roof overhang is shielding the windows, you may not get any 
> > solar beam to beam through windows except in the morning and 
> > afternoon periods, when the sun altitude angle is low.  If you plot 
> > this variable, you will see two peaks during one day, on the 
> > windows facing South.  The North facing windows will see these 
> > during the Summer. I used  March 21,  June 21, September 21, 
> > December 21 in the four DesignDay object for the four seasons.  If 
> > you want to have special schedules, you can use CustomDay1, 
> > SUmmerDesignDay, CustomDay2, WinterDesignDay for them. The maximum 
> > temperature occured on July 21 2 pm, because it is an diffused heat 
> > transfer effect from the ground and cloud to the environment 
> > outdoor air.  This is a statistical value. The OA temperature etc. 
> > can be selected from the stat file, or the epw weather file for the 
> > location.  These controls the convection heat balance on the 
> > exterior surfaces.  Do not forget to turn on the skyclearance to 
> > unity in Winter.  This controls the solar beam into the windows and 
> > change the MRT in the room. Blinds inside the window will reduce 
> > the solar heating, but not as afficient as the external 
> > one.  Interior window temperature may not be the window glass 
> > temperature. The rate tells you how strong is the sun, the energy 
> > gives you the total heat transmitted.  You can sum this on the 
> > spread sheet to get the monthly solar beam heating component. In 
> > building design, the annual value is not very useful.  When you 
> > rotate the building, the window area and orientation are the 
> > controlling factor.   In order to reduce the two peaks, you add 
> > vertical fins on two sides of the windows.  Changing the glass 
> > position would also help. (recessed and bay window.)  With natural 
> > ventilation, an open window can work like a fin and  reduces the 
> > beam into the room.=================All surface temperature are 
> > reported.  You can find these in the .rdd file.  Use timestep to 
> > list and plot them. You can reduce the number of variables 
> > displayed using the .rvi file to selected from the .eso file, 
> > provided the variables are requested in the IDF.  The 
> > advancedOutput directory under the exampleFiles directory has an 
> > exercise to show you the use of .rvi to get hourly, daily, monthly 
> > listing.=========================The heating and cooling load is 
> > calculated by summing all the zone surfaces and obtain a heat 
> > balanced condition.  The internal heat is added, and then get a 
> > mean temperature.  If this temperature is higher than the set 
> > point, a volume of air is exchanged with the cooled air, until the 
> > set point is met.  Then the air change will still go on, if the fan 
> > is on, but the temperature of the cooled air would be different, 
> > because the coolin>  To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > > From: zqianmin@
> > > Date: Tue, 12 Jul 2011 16:51:40 -0700
> > > Subject: Re: [EnergyPlus_Support] Design Day V.S. Schedule
> > >
> > >
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> > >
> > >       Thank you so much for your help!
> > > I have a question about the report output. I want to take a look 
> > at the solar heat gain through all the fenestration, and heat gain 
> > through walls in different orientations to understand how 
> > energyplus calculate the cooling load. But I couldn't find these in 
> > my summary report. I selected all summary and monthly in 
> > output:Table: summary reports.
> > >
> > > Regards,Qianmin
> > >
> > > On Tue, Jul 12, 2011 at 1:52 PM, YuanLu Li <yli006@> wrote:
> > >
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> > >
> > > Hi, QiangMin
> > >
> > > ==================SizingPeriod:DesignDay,
> > >     SACRAMENTO Ann Clg .4% Condns DB=>MWB,  !- Name
> > >     38.4,                    !- Maximum Dry-Bulb Temperature {C}
> > >     18.6,                    !- Daily Dry-Bulb Temperature Range {deltaC}
> > >
> > >     20.6,                    !- Humidity Indicating Conditions at 
> > Maximum Dry-Bulb
> > >     101229.,                 !- Barometric Pressure {Pa}
> > >     2.4,                     !- Wind Speed {m/s}
> > >     260,                     !- Wind Direction {deg}
> > >
> > >     1.00,                    !- Sky Clearness
> > >     0,                       !- Rain Indicator
> > >     0,                       !- Snow Indicator
> > >     21,                      !- Day of Month
> > >
> > >     7,                       !- Month
> > >     SummerDesignDay,         !- Day Type
> > >     0,                       !- Daylight Saving Time Indicator
> > >
> > >     WetBulb;                 !- Humidity Indicating Type
> > >
> > > There are more fields below this line in the later version of EPlus.
> > > For temperature profile, comfort typw, RH, etc.
> > >
> > >
> > > ======================SummerDesignDay and WinterDesignDay are the 
> > name of the schedules which you would like to use with the Sizing 
> > object. (day types 9 and 10) Because the weekdays, etc. are related 
> > to the real situations, EPlus provided four extra conditions for 
> > you to do the simulation.  In your schdules, if you wanted to use a 
> > week day to do the simulation, simply replace SummerDesignDay with, 
> > say, Monday.
> > >  The Day of Month and Month specify the solar angle or earth tilt 
> > angle.  The Daylight saving time adjust the local time, as the 
> > solar noon and local time noon is changed by one hour.  You may 
> > change these to other days and define special schedules and call 
> > them CustomDay1 and CustomDay2 (daytypes 11 and 12).
> > >  You can use as many DesignDay object as you want.  However, you 
> > may need to use unique names.  The data fields can be identical. 
> > When you use the annual simulation or short runPeriod simulation, 
> > the actual weather file conditions are used.
> > >  When you use the Designday sizing simulation, the 24 hour period 
> > is repeated until the midnight conditions are the same. When you 
> > use the weather file simulation, the conditions of the previous day 
> > is carried forward to the next day at midnight.
> > >  Sizing is controlled by what you think the system should be and 
> > is fixed.  You have used  sizing multiplier of 1.2, which means you 
> > want the system to be larger.  You can also make it smaller and 
> > veriy with the PLR listing for the whole year.
> > >  The schedule can be changed according to occupancy and can have 
> > many different conditions for the whole year.  Therefore you have 
> > National, Xmas, Easter holidays, etc.By default,I think Saturday is 
> > in the Holidays group.  You can list all the schedules to verify as 
> > in my attached IDF.   I have removed all your unused material and 
> > constructions.
> > >  School holidays can be scheduled as a period with allDays 
> > with  holiday values.==========================
> > > RunPeriod,
> > >     Annual,             !- Name
> > >     1,                       !- Begin Month
> > >
> > >     1,                       !- Begin Day of Month
> > >     12,                      !- End Month
> > >     31,                      !- End Day of Month
> > >     UseWeatherFile,          !- Day of Week for Start Day
> > >
> > >     Yes,                     !- Use Weather File Holidays and Special Days
> > >     Yes,                     !- Use Weather File Daylight Saving Period
> > >     No,                      !- Apply Weekend Holiday Rule
> > >     Yes,                     !- Use Weather File Rain Indicators
> > >
> > >     Yes,                     !- Use Weather File Snow Indicators
> > >     1.0000;                  !- Number of Times Runperiod to be Repeated
> > > =======================
> > > If you use short period for simulation, the first day result may 
> > not be accurate, therefore, the repeat field is provided for you to 
> > run the simulation a few time and use the second or third group results.
> > > You can shift the week days along by specifying a different day, 
> > say Monday, as day of week for start day of the weather file.
> > >  Dr. Li
> > >
> > > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > >
> > > From: zqianmin@
> > > Date: Tue, 12 Jul 2011 13:01:50 -0700
> > > Subject: [EnergyPlus_Support] Design Day V.S. Schedule
> > >
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> > >
> > >       Hello, I have a question about sizing:design day.The 
> > project I'm working on is a primary school, the occupancy, 
> > lighting, and other schedule is different in summer time. There is 
> > no people at school during June and July.
> > >
> > > But my design day from weather data is July 21st. If I run and do 
> > the load calculation, it will be calculated on the design day, 
> > which means no occupancy and less lighting. Is there any way that I 
> > can size my unit on design day with full internal load in summer 
> > time and less internal load for winter design day?
> > >
> > > I don't want to change my occupancy and other schedules to 
> > increase the energy consumption.Thanks for your help!
> > > Qianmin
> > >
> >
> >
> >
> >
> >------------------------------------
> >
> >Primary EnergyPlus support is found at:
> >http://energyplus.helpserve.com or send a message to 
> >energyplus-support@...
> >
> >The primary EnergyPlus web site is found at:
> >http://www.energyplus.gov
> >
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> >
> >Attachments are currently allowed but be mindful that not everyone 
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> >Yahoo! Groups Links
> >
> >
> >
>




------------------------------------

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