Question-and-Answer Resource for the Building Energy Modeling Community

Is there sub 1 Minute level heat Addition in EnergyPlus?

asked 2015-10-29 19:51:13 -0600

nadish21

397 ●3 ●9

updated 2015-10-29 20:14:45 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

Hello,

I am Trying to simulate a normal HVAC system with a Fan, Electric Heating Coil and a Cooling Coil. I get energy added by the heater in a timestep as below its addition capacity, as if the Heater was operating for a fraction of a Minute. Is this possible in EnergyPlus? Since the minimum Timestep is 1 minute how could this behavior take place?

Any Help will be greatly appreciated.

Sincerely,

Nadish Anand

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2015-10-30 07:45:16 -0600

Archmage

7185 ●3 ●11

Most of the HVAC models in EnergyPlus are formulated for what is called part load operation. This allows running at timesteps that are long relative to the cycling that might happen with real equipment. The models determine what fraction of the time the unit needs to be "on" to meet the load. Because of this it is quite normal for devices to run below their capacity. About the only time they will run at full capacity is if they cannot serve all the load or meet setpoint.

edit flag offensive delete link

add a comment

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Training Workshops

Careers

Question Tools

1 follower

Stats

Asked: 2015-10-29 19:51:13 -0600

Seen: 126 times

Last updated: Oct 30 '15

Site design and logo: Copyright © 2015 Big Ladder Software LLC. All rights reserved.
The Unmet Hours and Big Ladder names and logos are trademarks of Big Ladder Software LLC.
User contributions licensed under the Creative Commons Attribution Share Alike 3.0 License.

Is there sub 1 Minute level heat Addition in EnergyPlus? edit