Importing thermal loads from the BIM mode

CYPEHVAC can import the thermal loads per space calculated in programs such as CYPETHERM LOADS from the BIMserver.center project information.

These loads are represented in the model view by specific symbols, which are visible if the corresponding layer is activated in the "Own elements" panel, located by default on the left-hand side (by accessing "Imported requirements" and "Thermal loads").

Entering and editing thermal loads

Thermal loads can be entered and edited directly in CYPEHVAC using the table accessible from the "Assign" or "Edit" icons in the "Thermal loads" group in the upper toolbar.

Loads can be defined with a total value or by their value per unit area:

• Total thermal load (kW)
• Thermal load per unit area (W/m2)
  • Area

The following parameters can be defined for cooling loads and heating loads:

• Cooling
  • Total cooling load
  • Sensible cooling load
  • Indoor design temperature
  • Relative humidity
• Heating
  • Heating load
  • Indoor design temperature

Assigning thermal loads

Automatically assigning heat loads

If a thermal load is imported into a space defined in the BIM model and there are one or more terminal elements in that space (e.g. radiators), the program performs the load assignment automatically.

The combined power of these elements will appear as "Installed power" in the thermal load of the space, so the program can check if it is enough to cover the load.

Manually assigning heat loads

If necessary, a percentage of the thermal loads of the spaces (either loads read from the BIM model or loads entered directly into the program) can also be manually assigned to the desired equipment using the "Assign" icon in the "Thermal loads" group in the upper toolbar or by editing each element and using the options in the "Assigned thermal loads" section.

This option is useful if the terminal elements in each space are not entered, e.g. if in a ducted fan coil or air conditioning system the air distribution system is not modelled.

Required capacity

If the "Required capacity" option in the equipment editing panel is activated, the power required to be covered by the equipment is defined directly. This power requirement can be entered in such a way that it is equivalent to the thermal load of the space and can be different from the nominal power of the equipment.

If the "Power requirement" option is deactivated, the system is sized at rated power.

This affects the flow rate of the water pipes leading to the equipment, and also affects the requirements of the generating equipment, such as heat pumps or boilers.