Why the fan schedule is not working?

energyplus
openstudio
fan
retag add tags

Hi,

I´ve been working in a HVAC system and I am facing a problem regarding to the fans that I had applied to my model. The fan is a constant volume fan. I made a schedule in order to turn the fan off during the weekends and between time period of 7:00pm and 7:00am during week. Then I associated this schedule to each fan. The result shows no reduction in the energy consumption if compared with the case in which the fans are kept turn on 24 hours per day, and every day of the week. It seems that the schedule made by me it is not being working. A bring some pictures here to show in details how I am dealing with it. My conclusion is based on the fan consumption which remains the same, even when my schedule is applied and in the zone mechanical ventilation, which shows that this fan is working continuously, without interruption (last picture).

Thanks!!!

723

hugopft

asked 2015-03-01 10:53:45 -0500

4.4k

__AmirRoth__

updated 2015-03-01 14:35:39 -0500

edit flag offensive 0 remove flag close merge delete

Comments

@hugopft, welcome to UnmetHours! Two quick things. 1. Your images did not upload properly. Try again? 2. Please tag your question with the software you are using, e.g., 'energyplus', 'openstudio', 'equest', 'ies-ve', etc. This will help route the question to the right people.

__AmirRoth__ (2015-03-01 11:02:20 -0500) edit

Thanks Amir Roth for the tips!!!

hugopft (2015-03-01 11:08:45 -0500) edit

@hugopft, I think the first image isn't showing the schedule that you are having problems with.

Geraldo Pithon (2015-03-01 17:06:08 -0500) edit

add a comment see more comments

1 Answer

Sort by

oldest

newest

most voted

Leave the fan schedule as always on. Instead set the HVAC operation schedule from the "Control" sub tab. This will translate to the appropriate availability manager, taking into account night cycle settings.

image description

Update

Here is the model with an HVAC Schedule coming on at 8 am and off at 5 pm. I plotted the schedule value vs supply outlet node flowrate and found expected agreement.

image description

Kyle Benne

answered 2015-03-02 10:20:03 -0500, updated 2015-03-02 23:27:55 -0500

edit flag offensive 0 remove flag delete link

Comments

First of all thanks for your answer Kyle Benne. I made the changes as you suggested, but the fan consumption remained the same.

hugopft (2015-03-02 15:09:31 -0500) edit

If you want to provide a link to your model I'll take a look.

Kyle Benne (2015-03-02 15:29:46 -0500) edit

Here is the link with the model and the weather file. https://drive.google.com/folderview?i...

Thanks for the attention.

hugopft (2015-03-02 16:05:59 -0500) edit

@hugopft I took a look at your model. I didn't see the Fan Constant Volume schedule shown in your original screenshot so I made a new schedule named "HVAC Schedule" and set as the availability schedule on "0BSL DE EQUIPPackaged Rooftop Heat Pump". I plotted the supply outlet node flow rate vs the HVAC schedule value on the air flow rates where zero as expected when schedule was off.

Kyle Benne (2015-03-02 23:25:17 -0500) edit

Kyle Benne, thanks very much. Now the schedule is working properly.

hugopft (2015-03-03 06:11:21 -0500) edit

add a comment see more comments

Why the fan schedule is not working? edit

Comments

1 Answer

Comments

Why the fan schedule is not working?