The following options are available:

• Design and checks
• Refrigerant concentration limit
• Automatic path
• External conditions
• Internal conditions
• Working fluid
• Drawing symbols

Details of the utilities as mentioned above are given below.

Design and checks

In this section, the criteria for the design of different elements in the installation, such as pipes, ducts and expansion vessels, are configured and certain checks on them are activated.

• Element references
  • Generate references upon analysing (optional)
    • Overwrite previously assigned references (optional)
      
• Pipe design criteria
  • Maximum velocity (m/s)
  • Maximum pressure loss of the span (mwc/m)
  • Equivalent length (%)
    
• Design criteria for the ducts
  • Maximum velocity (m/s)
  • Maximum pressure loss (Pa/m)
  • Allowable dimensions for ducts
    • Dimension (mm)
    • Maximum allowable aspect ratio (n:1)
      
• Expansion tank design criteria
  • System fill pressure (m wcf) (Heating / Cooling)
  • Set pressure of the pressure relief valve (mWh) (Heating / Cooling)
    
• Environmental conditions of the path of the pipes
  • External temperature (ºC) (Heating / Cooling)
  • Internal temperature (ºC) (Heating / Cooling)
    
• Checks
  • Maximum input temperature of the emitters (ºC) (optional)
  • Minimum input temperature of the emitters (ºC) (optional)
  • Maximum percentage of heat loss in the pipes (%)
  • Operating point (tolerance) (ºC)
    

Refrigerant concentration limit

Activates the refrigerant limit charge check depending on the selected building type.

• Check the refrigerant charge limit R-410A (EN378)
• Type of building
  • Category A: Hospital
  • Category B: Household, commercial, teaching, public attendance
  • Category C: Business premises and offices, administrative
  • Category D: Industrial

Automatic path

Sets the distances used by the "Automatic routing (VRF)" option in the "Analysis" group.

• Indoor unit
• Flow unit
• Outdoor unit
• Relative installation height
• Minimum space between rows

External conditions

Defines the outdoor air conditions.

• Outside air
  • Altitude (m)
  • Summer dry bulb temperature (ºC)
  • Summer wet bulb temperature (ºC)
  • Winter dry bulb temperature (ºC)
  • Winter relative humidity (%)
  • Winter wet bulb temperature (ºC)
• Air properties
  • Barometric pressure (mca)

Air density (Calculated/User) (^kg/m3)

Climate data import

Data on outdoor conditions can be imported from the weather database of the American Society for Heating, Refrigerating and Air-Conditioning ASHRAE Weather Data Viewer 6.0 using the corresponding button on the right-hand side of the "External conditions" window.

Internal conditions

Defines indoor air conditions.

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

Working fluid

Defines the properties of the working fluid. For this purpose, its reference and its properties at different temperatures are defined:

• Reference
• Table of working fluid properties
  • Temperature (ºC)
  • Density (kg/m3)
  • Specific heat (J/(kg-C))
  • Kinematic viscosity (x 10-6 m2/s)

Users can import predefined values for water and for water with different additives using the wizard on the right:

• Properties of the working fluid
  • Working Fluid (Water / Water with ethylene glycol / Water with propylene glycol)