Packaged Terminal Air Conditioner

A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air-conditioning system. Some PTACs are cooling-only type.

Required Objects

The packaged terminal air conditioner (PTAC) must have the following property.

• It must be attached to a conditioned zone.

Design Assumptions

If the Draw Ventilation property is selected, the following will occur.

• The unit will provide the design outdoor air flow.
• The fan will run constantly during occupied hours.

If the Draw Ventilation property is not selected, the following will occur.

• The unit will not provide any ventilation.
• The fan will cycle on and off to meet conditioning needs.

Property	Value	Notes
System air flow	Constant
Cooling supply air temperature	12.78°C
Heating supply air temperature	40°C

Cooling Coil

The cooling coil has the following assumptions.

• It has a single speed DX coil.
• The sensible-to-latent heat ratio is auto-sized to meet system needs during sizing.

Property	Value	Notes
Coil leaving air temperature	12.78°C
Chilled water design inlet temperature	3.0

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 the hot water loop.
Hot water design outlet temperature	N/A	Set by the 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%