Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page

# Revision history [back]

### How are the Zone Component Loads Summary fields calculated?

I have a radiant panel system with a dedicated 100% OA unit. The OA unit supplies air at 55/70 for cooling and heating. The radiant panels do the actual zone conditioning and they are specified with priority 1 over the zone equipment for the OA unit. The space setpoints are 76/70 for cooling and heating.

We are doing sizing of the equipment plants, and to verify that the loads are correct we are using the Zone Component Loads Summary.

The field Main Fan Air Flow shows an astronomically high airflow during the heating operation. How is this air flow calculated? Is it taking into account the contribution of the zone radiant panels? It looks like it is not and it is assuming that the DOAS air stream is the one contributing to the heating of the space. We would be expecting the Main Fan Air Flow to match the Outside Air Flow.

I have attached a picture of the report section.

Report

### How are the Zone Component Loads Summary fields calculated?

I have a radiant panel system with a dedicated 100% OA unit. The OA unit supplies air at 55/70 for cooling and heating. The radiant panels do the actual zone conditioning and they are specified with priority 1 over the zone equipment for the OA unit. The space setpoints are 76/70 for cooling and heating.

We are doing sizing of the equipment plants, and to verify that the loads are correct we are using the Zone Component Loads Summary.

The field Main Fan Air Flow shows an astronomically high airflow during the heating operation. How is this air flow calculated? Is it taking into account the contribution of the zone radiant panels? It looks like it is not and it is assuming that the DOAS air stream is the one contributing to the heating of the space. We would be expecting the Main Fan Air Flow to match the Outside Air Flow.

I have checked the Engineering reference, the Input Output Reference, and the Output Details and Examples document.

I have attached a picture of the report section.

Report

### How are the Zone Component Loads Summary fields calculated?

I have a radiant panel system with a dedicated 100% OA unit. The OA unit supplies air at 55/70 for cooling and heating. The radiant panels do the actual zone conditioning and they are specified with priority 1 over the zone equipment for the OA unit. The space setpoints are 76/70 for cooling and heating.

We are doing sizing of the equipment plants, equipment, and to verify that the loads are correct we are using the Zone Component Loads Summary.

The field Main Fan Air Flow shows an astronomically high airflow during the heating operation. How is this air flow calculated? Is it taking into account the contribution of the zone radiant panels? It looks like it is not and it is assuming that the DOAS air stream is the one contributing to the heating of the space. We would be expecting the Main Fan Air Flow to match the Outside Air Flow.

I have checked the Engineering reference, the Input Output Reference, and the Output Details and Examples document.

I have attached a picture of the report section.

Report