Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
1

How to set chillers operating alternately?

asked 2016-06-04 07:36:19 -0500

Lowlay gravatar image

updated 2016-07-07 09:11:09 -0500

Hi everyone, I am simulating a building with two electric chillers which are same type( same capacity, energy consumption) in EnergyPlus. In reality two chillers are operating alternately(when "Chiller01" is operating, "Chiller02" turns off), how should I set operate strategy in EnergyPlus? Is it only I set 365 days operate strategies to simulate? Or I should only set a single chiller in EnergyPlus.

If there is any response, then I would be very grateful.

Sincerely, Yueh-Chin

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted
1

answered 2016-06-04 12:48:19 -0500

rkbest gravatar image

Please explain why you need two chillers if you want only one to operate at a time.

Usually, you would need two chillers to meet your design day demands; the demand shared between the two adding up to the total. During lower demand hours, you can set the operation control under 'Plant-condenser control' in you order preference. example:- once you have the equipment list as CoolSys1 Chiller1 supply and CoolSys1 Chiller 2supply,

IDF,PlantEquipmentOperation:CoolingLoad,CoolSys1 Operation Scheme,0.0,50000,CoolSys1 Chiller1 supply,50000,10000000,CoolSys1 Chiller 2supply,,,,,,,,,,,,,,,,,,,,,,,,;

If you still want to limit operation, have you tried using Schedules for each chiller instead of always ON to alternate hours. This will be very crude way, but you can try.

edit flag offensive delete link more

Comments

In my case, the system designer set one of two chillers as a spare chiller. To avoid chiller without long-term operation lead to failure, the designer make chiller operate alternately("Chiller01" turns on & "Chiller02" turns off at day1, then "Chiller02" turns on & "Chiller01" turns off at day2), it also helps chillers operating at high load and high efficiency.

Lowlay gravatar imageLowlay ( 2016-06-04 23:14:59 -0500 )edit

If they are never operating together then just model a single chiller that will be enough for your need. Aggregate your data based on the days of operation from both chiller as post processing.

rkbest gravatar imagerkbest ( 2016-10-17 15:06:56 -0500 )edit

Your Answer

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

Add Answer

 

Question Tools

1 follower

Stats

Asked: 2016-06-04 07:36:19 -0500

Seen: 76 times

Last updated: Jun 04 '16