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
> >
> >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.
> >Yahoo! Groups Links
> >
> >
> >
>
------------------------------------
Primary EnergyPlus support is found at:
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