A series fan powered box has a fan that must run throughout the occupied mode in order to deliver ventilation air to the zone.
Required Objects
The Series Fan Powered Box (SFPB) must have the following properties.
- It must be attached to an air system.
- It must be attached to a conditioned zone.
Design Assumptions
- The air flow is sized for the sensible peak on a traditional air system and only ventilation for a dedicated outdoor air system (DOAS).
| Property | Value | Notes |
|---|---|---|
| Cooling supply air temperature | N/A | Determined by the Air System (typically 12.7778°C). |
| Heating supply air temperature | 40°C |
Reheat Coil
The reheat coil has the following assumptions.
- The electric resistence reheat coil is 100% efficient.
- The furnace reheat coil is 80% efficient.
- The hot water reheat coil has the following properties.
| Property | Value | Notes |
|---|---|---|
| Coil entering air temperature | Varied | Determined by the air system (typically between 12.7778°C and 18.3333°C by default). |
| Coil leaving air temperature | 40°C | |
| Hot water design inlet temperature | N/A | Set by hot water loop if hot water coil is used in system. |
| Hot water design outlet temperature | N/A | Set by hot water loop if hot water coil is used in system. |
Supply Fan
The supply fan has the following assumptions.
| Property | Value | Notes |
|---|---|---|
| Pressure Rise | 250 Pa | |
| Total Efficiency | 70% | |
| Motor Efficiency | 94% | |
| Flow Mode | Constant |