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

How do I create part load EER curve for DX cooling in OS?

asked 2016-11-02 21:27:43 -0600

SVVitale gravatar image

updated 2017-05-02 12:39:55 -0600

Rather than using IEER values for DX equipment efficiency, I understand that we must convert EER to COP (COP=EER/3.41) and then must create a part load curve. Are there input fields in OS that allow for this or do I need to work directly in Eplus? Also if I have manufacturer information on IEER, but presumably that is not valid, so how do I go about translating the vendor information into an Eplus-simulated part load efficiency curve?

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2016-11-03 09:37:51 -0600

updated 2016-11-03 09:42:02 -0600

The first screenshot below shows a DX object in the edit pane.

image description

You can see the curve names identified here. If you scroll down further you can see and edit the curve values.

image description

A few people have written measures to import in curve data from external files, but not sure if those are published. There is also a TableMultiVariableLookup object than can be used instead of a curve. That object isn't exposed in the GUI, but can be accessed with a measure.

edit flag offensive delete link more


Thank you. How do I go about matching the part load curve data fields in OS to my actual equipment? I have actual vendor data for my equipment with an EER of 10.2 and an IEER of 16.4. My understanding is that I would input a value of 2.99 for COP (=10.2/3.41) and then I need to input part load curve data to approximate the IEER of 16.4.

SVVitale gravatar image SVVitale  ( 2016-11-04 12:12:41 -0600 )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


Asked: 2016-11-02 21:27:43 -0600

Seen: 206 times

Last updated: Nov 03 '16