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100% Outdoor Air Unit No ERV

asked 2017-12-04 09:26:09 -0600

jmoody gravatar image

updated 2017-12-05 15:15:35 -0600

Read through several DOAS discussions pertaining to using ERV's for 100% outdoor air. I have a specific application where I need to not have ERV's just cooling and heating coils (water cooled DX) that maintain specific leaving temperature and humidity ratio requirements.

I am working on testing a few options but wanted to see if anyone has done this before and has any input? Specifically on how to setup the controls for the leaving temperature and humidity requirements.

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what software are you using? Also a DOAS doesn't need to have an energy recovery wheel. Putting setpoints on the cooling and heating coils will control the coils as you require (this depends a bit on how you are modelling your system, but in general that works)

Annie Marston gravatar imageAnnie Marston ( 2017-12-04 13:31:02 -0600 )edit

I should have included that. I am using the latest Open Studio. What I really need to figure out, more because I have never used it before, is how to set the cooling coil to control to a leaving humidity ratio and then the heating coil or hot gas reheat would bring it back up to temperature.

jmoody gravatar imagejmoody ( 2017-12-04 13:59:14 -0600 )edit

I'll put this in the answer as i think it is an answer rather than a comment

Annie Marston gravatar imageAnnie Marston ( 2017-12-04 15:47:41 -0600 )edit

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answered 2017-12-04 15:49:54 -0600

To set temperatures and humidity ratios on coils you need to use setpoints. I know how to find these in EnergyPlus but not 100% sure in Openstudio, there are plenty of people on here who know how. But look for setpoints these will control the coils. It does depend a bit on how you set up your system though. If you are using a zone system the setpoints won't work in this way it is easier to control the systems when you set them up as AHUs.

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Asked: 2017-12-04 09:26:09 -0600

Seen: 33 times

Last updated: Dec 04