Variable Volume Fan Coils with Water-Cooled Chiller with Gas Boiler with DOAS and ERV - This system consists of a 4-pipe Variable Speed Fan Coil Unit serving each conditioned thermal zone. Chilled water is provided by a primary only variable flow chilled water loop. Hot water is provided by a primary only variable flow hot water loop served by a natural gas boiler. A Single DOAS/ERV system is modeled to precondition the outside air for each thermal zone using an ERV along with chilled and hot water coil. The default ASHRAE Standard used to set the efficiency of regulated equipment is ASHRAE 90.1-2016.

Water Cooled Chiller:

Quantity: 1

Capacity: Auto-sized

Compressor Type (Screw, Centrifugal or Scroll compressor), based on capacity

Controls: Based on Capacity and ASHRAE Standard

Efficiency: Based on Capacity and ASHRAE Standard

Chilled Water Pumps:

Quantity: 1

Design Flow: Auto-sized

Type: Variable Speed, 30% minimum flow

Efficiency: Based on design flow and ASHRAE Standard

Hot Water Boiler:

Quantity: 1

Capacity: Auto-sized

Type: Natural Gas, Efficiency based on Capacity and ASHRAE Standard

Controls: Based on Capacity and ASHRAE Standard

Hot Water Pumps:

Quantity: 1

Design Flow: Auto-sized

Type: Variable Speed, 30% minimum flow

Efficiency: Based on Design Flow and ASHRAE Standard

ERV:

Quantity: 1

Design Flow: Auto-sized

Controls: Based on Climate Zone and ASHRAE Standard

Effectiveness: Based on Design Airflow, % Outside Air, Climate Zone and ASHRAE Standard

DOAS AHU:

Design Flow: Auto-sized

Controls: Based on Design Airflow, Climate Zone and ASHRAE Standard

DOAS AHU Fans:

Quantity: 1

Design Airflow: Auto-sized

Efficiency: Based on Design Airflow and ASHRAE Standard

Variable Speed Fan Coil Units:

Quantity: 1 per thermal zone

Heating Coil Type: Hot Water

Cooling Coil Type: Chilled Water

Fan Speed Controls: Based on Zone Airflow and ASHRAE Standard