DOAS for Dehumidification Paired with RTU for Heating/Cooling

asked Mar 15

avril14
235 ●1 ●6

updated Mar 17

Aaron Boranian

14375 ●90 ●25 http://bigladdersoftware.com/

image description The system I'm trying to model in OpenStudio is a DOAS unit with an enthalpy wheel and DX coil doing only dehumidification, and then sending dehumidified air to a regular rooftop unit for additional heating/cooling. I've represented the setup I'd like to use here but haven't been able to get it to run. The run just crashed without a proper error report so I can't get an indication of the actual issue. Has anyone had success modeling this type of system before? Thanks!

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I can only speak to this topic as a designbuilder user. DB does not allow airloop to airloop connection. Further, DB does not allow multiple ADUs within a zone group. Thus, when we design an ERV to connect to the return of an RTU, I have to model the ERV functionality within the RTU.

Greg Estep ( Mar 17 )

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Hi Petros, the zones do have humidifying and dehumidifying setpoints, it runs without issues when the dehumidification coil is on the main loop. It crashes when I move the dehumidification coil to the outside air branch. I'm just wondering if it's possible to have a cooling coil on the outside air branch or if it's not allowed by the program? Thanks.