Building was Built in the 70s What would I use for Design OA and Infiltration

asked 2024-05-14 15:53:21 -0600

DSMEAEP
11 ●1 ●2

updated 2024-05-16 06:23:09 -0600

14155 ●83 ●24 http://bigladdersoftware.com/

First time using this EnergyPLus and Openstudio. Currently I am trying to model a school building in the 50s with an extension built in the 70s. Below are some of my questions:

The building is mainly window A/Cs, how would I model these
For heating the Unit ventilators have OA intakes that periodically open, how would I model this?

Thank you so much!

edit retag flag offensive close merge delete

add a comment

2 Answers

Sort by » oldest newest most voted

answered 2024-05-17 13:10:57 -0600

JasonGlazer

6855 ●26 ●12 http://www.gard.com/

If you are looking for the efficiency level and air flow rates that make sense for a building that age you might want to take a look at reference buildings that NREL has modeled for pre-1980. The models are for reference buildings but the assumptions made in them might help you figure out the assumptions for both questions. My instinct is that a window A/C unit from that era has a 6 EER to 8 EER for efficiency when new. With the amount of maintenance that window A/C unit usually get, the efficiency probably has dropped significantly since the units were new.

edit flag offensive delete link

Comments

I imported the pre1980s library and used the values for the building type for infiltration

DSMEAEP ( 2024-05-17 15:28:36 -0600 )edit

add a comment

answered 2024-05-17 11:39:20 -0600

Greg Estep
669 ●20 ●6

updated 2024-05-17 11:40:00 -0600

For window AC, use PTAC. For the unit ventilators, I would use PTAC with outdoor air supply. If the unit ventilators have energy recovery device, then you will need to use an air loop and an AHU. You then use schedules to control the OA.

edit flag offensive delete link

Comments

The UV are connected to a hydronic boiler loop with 2 boilers. Im gong to attempt to model that in a bit - in the loop do I need to include both boilers? Simple question probably I know but Im not entirely sure. I see that there is a heating only unit ventilator option in the zone equiptment. Any reason I shouldnt use that aside from the OA damper issue?

DSMEAEP ( 2024-05-17 15:27:39 -0600 )edit

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

Building was Built in the 70s What would I use for Design OA and Infiltration

2 Answers

Comments

Comments

Your Answer

Training Workshops

Careers

Question Tools

Stats

Building was Built in the 70s What would I use for Design OA and Infiltration edit

2 Answers

Comments

Comments

Your Answer

Training Workshops

Careers

Question Tools

Stats

Building was Built in the 70s What would I use for Design OA and Infiltration