RE: [EnergyPlus_Support] Re:which one is right?

ooi:

Thank you for the answer!

I did two simulations using the same weather file. The only difference in the two

idf files used in the simulations is the settings in object RunPeriod. In the

first run, the field "Number of times runperiod to be done" was set to 1 and in

the second run this value is changed to 2.

I got different results on heating load / cooling load and the results for the

first run is:
heating: 2.18412E+12GJ
second run:
heating: 2.15145E+12GJ
the run period is from fifth November to fifth March of the next year.
The difference may be small for the total value, but it is large for houly value

of some days. The houly result is still different，and this trend will be obvious

for the intermittent cooling or heating. One day's result is in the attachment.

I am using E+ ver 2.2.

Thanks a lot!

Yunjie

From: ooi <ooi_kb3@hotmail.com>
To: EnergyPlus_Support@yahoogroups.com
Sent: Tuesday, December 23, 2008 8:44:00 AM
Subject: [EnergyPlus_Support] Re:which one is right?

Yun Jie,

Cooling load depends on Heat transfer through the walls, windows, floors, ceilings and roof. Air movement through door, window openings also contribute

Basically, heat transfer can be by conduction, convection and radiation and this depends on outside environment. Generally, the data on outside environment is given by the weather file. If the year’s hourly data on temperature, radiation, wind speed and direction does not change and the setpoint for the indoor temperature does not change, then the two years’ energy consumption should not change.

ooi

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