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

Qianmin

On Tue, Jul 12, 2011 at 1:52 PM, YuanLu Li <yli006@xxxxxxxxxxx> wrote:

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@xxxxxxxxx
Date: Tue, 12 Jul 2011 13:01:50 -0700
Subject: [EnergyPlus_Support] Design Day V.S. Schedule

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