Unit Heater

Unit heaters are designed for use in space heating applications.

Required Objects

The unit heater must have the following property.

• It must be attached to a conditioned zone.

Design Assumptions

Property	Value	Notes
System air flow	Constant
Heating supply air temperature	40°C

Heating Coil

The heating coil has the following assumptions.

• The electric resistence heating coil is 100% efficient.
• The furnace heating coil is 80% efficient.
• The hot water coil has the following properties.

Property	Value	Notes
Coil leaving air temperature	40°C
Hot water design inlet temperature	N/A	Set by hot water loop.
Hot water design outlet temperature	N/A	Set by hot water loop.

Supply Fan

The supply fan has the following properties.

Property	Value	Notes
Pressure rise	250 Pa
Total efficiency	70%
Motor efficiency	94%