Water terminal units include radiators, radiant floor heating and fan coils, that are connected to water-based air-conditioning systems such as boilers, chillers, air-source heat pumps and geothermal units.

Radiator

This simulates a radiator or a set of radiators arranged in the heating zone.

System

• Water terminal unit
  Allows users to select a hot-water system defined in the "Air-conditioning systems" section or to enter it directly.

Heating

• Thermal capacity (optional)
  Allows users to specify a value for the thermal capacity of the radiator and for the following parameters:
  • Design room temperature
  • Design supply temperature
  • Design temperature difference

Radiant floor

This allows users to simulate radiant floor heating in the thermal zone.

System

• Hot-water system
  Allows users to select a hot-water system defined in the "Air conditioning systems" section or to enter it directly.

Heating

• Heating capacity (optional)
  Allows users to specify a value for the thermal power of the radiant floor and for the following parameters:
  • Design room temperature
  • Design supply temperature
  • Design temperature difference

Generic

This is used to simulate a generic fan coil or the set of generic fan coils arranged in the thermal zone.

System (Water loop / Air-source heat pump / Geothermal)

• Water loop
  • Hot-water system
    Allows users to select a hot-water system defined in the "Air conditioning systems" section or to enter it directly.
  • Chilled-water system
    Allows users to select a chilled-water system defined in the "Air conditioning systems" section or to enter it directly.
• Air-source heat pump
  • Air-source heat pump system
    Allows users to select an air-source heat pump system defined in the "Air conditioning systems" section or to enter it directly.
• Geothermal
  • Geometric heat pump
    Allows users to select a geometric heat pump defined in the "Air conditioning systems" section or to enter it directly.

Control

The fan coil power is controlled by varying the water and/or air flow rate.

• Capacity control method (Constant air flow, variable water flow / Variable air flow, variable water flow / Cycling air flow, constant water flow / Variable air flow, constant water flow)
• Low speed supply air flow ratio
• Medium speed supply air flow ratio

Supply fan

• Maximum air flow rate (optional)
  If the fan coil flow rate is not specified, EnergyPlus™ automatically calculates the flow rate to overcome all the loads in the zone according to the zone's "Automatic sizing options".
• Specific power
• Motor efficiency
• Motor heat losses fraction in air stream

Manufacturer

This is used to simulate a manufacturer's fan coil in the thermal zone.

System (Water loop / Air-source heat pump / Geothermal)

• Water loop
  • Hot-water system
    Allows users to select a hot-water system defined in the "Air-conditioning systems" section or to enter it directly.
  • Chilled-water system
    Allows users to select a chilled-water system defined in the "Air conditioning systems" section or to enter it directly.
• Air-source heat pump
  • Air-source heat pump system
    Allows users to select an air-source heat pump system defined in the "Air conditioning systems" section or to enter it directly.
• Geothermal
  • Geometric heat pump
    Allows users to select a geometric heat pump defined in the "Air conditioning systems" section or to enter it directly.

Equipment

• Open BIM Database equipment selection
  Allows users to select a fan coil from the manufacturers and models available in the Open BIM Database.