zone and DOAS coil capacity

asked 2016-02-03 15:26:40 -0500

ngkhanh gravatar image

updated 2016-02-03 15:36:36 -0500

As standard practice, the DOAS hybrid system works well for humidity control in case the latent load is all covered by DOAS coil and zone coil takes zone sensible load so they are able to be individually controlled by different coils/ Currently, the DOAS autosizing works properly in case airloop (DOAS) sizing system Ventilation Requirement Airflow (min outdoor airflow) is enough to cover all latent loads. In case this airflow/load rate is bigger than limit 125cfm/ton - or the airloop air should be sized as total load and set NO for 100% outdoor air options , we will see both airloop coil and zone coil is sizing based on total load -> wrong sizing result. I tried to set sizing system as flow per capacity rate but it has not much been effective. Have any pathway to overcome this issues (keep autosize option as much as possible) ?

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I asked a similar question here and this sort of functionality doesn't seem to be available yet. I put a feature request in for EnergyPlus to put the sizing type at the terminal unit rather than at the air system to add greater flexibility, but this isn't currently available in EnergyPlus.

pflaumingo gravatar image pflaumingo  ( 2016-02-03 15:56:56 -0500 )edit