The available options are as follows:

• External conditions
• Internal conditions
• Water distribution
• Direct expansion
• Air distribution
• Results output

These functions are detailed below.

External conditions

Defines the external air conditions.

• Outdoor air
  • Altitude (m)
  • Dry-bulb temperature, summer (ºC)
  • Wet-bulb temperature, summer (ºC)
  • Dry-bulb temperature, winter (ºC)
  • Relative humidity, winter (%)
  • Wet-bulb temperature, winter (ºC)
• Air properties
  • Barometric pressure (mwc)
  • Air density (Calculated/User-defined) (kg/m³)

Climate data import

Outdoor condition data can be imported from the ASHRAE Weather Data Viewer 6.0 database using the button to the right of the "Outdoor conditions" window.

To import this data, the following parameters must be defined:

• WMO region
  Defines the world region.
• Country
  Allows the country to be selected within the chosen region.
• Station name
  Allows the meteorological station to be selected within the chosen country.

From here, it is also possible to choose the percentile levels of the data to be imported:

• Annual percentile level (Heating)
  Allows a level of 99.6% or 99% to be selected.
• Annual percentile level (Cooling)
  • Temperaturas anuales
    Permite elegir un nivel de 0.4%, 1% o 2% para las temperaturas anuales.
  • Temperaturas mensuales
    Permite elegir un nivel de 0.4%, 2% o 5% para las temperaturas mensuales.

Internal conditions

Defines the indoor air conditions.

• Cooling dry-bulb temperature (ºC)
• Relative humidity (%)
• Cooling wet-bulb temperature (ºC)
• Heating dry-bulb temperature (ºC)

Water distribution

This section configures the sizing criteria for various elements of the water distribution system such as pipes and expansion vessels, and activates certain checks on them.

Design options

Allows the sizing process of the water distribution system elements to be adjusted:

• Search for the optimal selection
  During the design process, the program will search for and select the smallest element in the series that meets all requirements.
• Maintain the selection if checks are met
  During the design process, the program will attempt to retain the element selected by the user. If the selected element meets the requirements, the program will not change it, even if there is a smaller one that also meets them. However, if the selected element does not comply, the program will replace it with the smallest element that does.

Working fluid

Defines the properties of the working fluid by reference and at different temperatures:

• Reference
• Working fluid properties table
  • Temperature (ºC)
  • Density (kg/m³)
  • Specific heat (J/(kg·ºC))
  • Kinematic viscosity (×10⁻⁶ m²/s)

It is possible to import predefined values for water and for water with additives using the assistant to the right:

• Working fluid properties
  • Working fluid (Water / Water with ethylene glycol / Water with propylene glycol)

Environmental conditions along the pipe route

• Outdoor temperature (ºC) (Heating / Cooling)
• Indoor temperature (ºC) (Heating / Cooling)

Pipe design criteria

• Maximum velocity (m/s)
• Maximum head loss per section (mwc/m)
• Equivalent length (%)

Expansion vessel design criteria

• Filling pressure (mwc) (Heating / Cooling)
• Relief valve setting pressure (mwc) (Heating / Cooling)

Checks

• Maximum inlet temperature to emitters (ºC) (optional)
• Minimum inlet temperature to emitters (ºC) (optional)
• Maximum heat loss percentage in pipes (%)
• Operating point (tolerance) (ºC)

Direct expansion

Design options

Allows the design process of the direct expansion system elements to be adjusted:

• Search for the optimal selection
  During the design process, the program will search for and select the smallest element in the series that meets all requirements.
• Maintain the selection if checks are met
  During the design process, the program will attempt to retain the element selected by the user. If the selected element meets the requirements, it will not be changed, even if there is a smaller one that also meets them. However, if it does not comply, the program will replace it with a suitable one.

Refrigerant charge limit concentration

This section allows the verification of the refrigerant charge limit.

To "Check the R-410A refrigerant charge limit (EN378)", select the "Building type" from the following:

• Category A: Hospital
• Category B: Residential, commercial, educational, public access
• Category C: Offices and administrative premises
• Category D: Industrial

Selecting a building type displays the associated "Refrigerant concentration limit".

It is also possible to "Check the R32 refrigerant charge limit (IEC60335-2-40)".

Automatic routing

Configures the distances used by the "Automatic routing (VRF)" option in the "Calculation" group.

• Indoor unit
• Flow box
• Outdoor unit
• Relative installation level
• Minimum spacing between rows

Available diameters

Allows you to define which refrigerant line diameters are available by activating or deactivating the corresponding boxes.

Air distribution

This section configures the design criteria for various air distribution system elements, such as ducts, and activates certain checks on them.

Design options

Allows the design process of the air distribution system elements to be adjusted:

• Search for the optimal selection
  During the design process, the program will search for and select the smallest element in the series that meets all requirements.
• Maintain the selection if checks are met
  During the design process, the program will attempt to retain the element selected by the user. If it meets the requirements, it will not be changed. Otherwise, it will be replaced with a compliant one.

Duct design criteria

• Maximum allowable velocity (m/s)
• Maximum allowable pressure drop (Pa/m)
• Permissible duct dimensions
  • Dimension (mm)
  • Maximum allowable aspect ratio (n:1)

Calculate duct heat loss (optional)

Enables the thermal analysis of heat loss through air ducts when calculating or sizing the installation.

• Maximum percentage of heat losses in ducts (%)

• Minimum insulation thickness for ducts
  • Defined for ducts in the following categories:
    • Installed indoors (Heating, Cooling)
    • Installed outdoors (Heating, Cooling)
  • Further down, enter the "Thermal conductivity of reference material".

Calculate airborne noise transmission through duct system

Enables acoustic calculation in air ducts when calculating or designing the installation.

• 63 Hz band (optional)
• Minimum sound power level
• Acoustic map
  • Reference / From / To / Colour