HEATING LOAD CALCULATIONS

• EN 12831:2003
• (from 30.0 release) EN 12831-1:2017
• DIN EN 12831:2008-07
• PN EN 12831:2006
• ÖNORM EN 12831; ÖNORM H 7500-1:2015
• DIN/TS 12831-1:2020-04

USABLE AND NET AREAS

• PN-ISO 9836:2015-12
• PN-ISO 9836:2022-07 (additionally PN-70/B-02365)

THERMAL CALCULATIONS OF WALLS

• PN EN ISO 6946, PN EN ISO 13370

THERMAL BRIDGES

• EN ISO 14683

RADIANT SYSTEMS DESIGN

• Supply temperature optimization – proprietary method
• Thermal calculations for wet (pipe in screed) and dry systems (heating and cooling):
  • EN 1264 with the update to EN 1264-2:2021 taking into account laminar flow in the calculations
  • DIN 4725-200 for increased screed thicknesses
  • National / manufacturer requirements saved in the system catalog
• Thermal calculations of panel systems:
  • EN 1264 with the update to EN 1264-2:2021 (heating and cooling)
  • EN 14037 (heating)
  • EN 14240 (cooling)
• Hydraulic calculation of panel systems:
  • standard formulas (Darcy and Colebrook formulas) for other panels

DESIGN OF DRY SYSTEM BOARDS ARRANGEMENT

• As for the RADIANT SYSTEMS DESIGN

RADIATOR SIZING

• thermal calculations in accordance with EN 442-2
• methods of selecting the size of the radiator – proprietary method
• additions taking into account radiator’s enclosure, configuration of connections and location – COBRTI Instal guidelines, information from manufacturers
• flow adjustment (correction) – proprietary method

PIPELINE NETWORK CALCULATIONS

• Hydraulic calculations – Darcy and Colebrook equations
• Diameter sizing – R_max and v_max criteria
• Hydraulic balancing – proprietary method
• Heat loss in pipelines – according to professional literature
• Pipeline insulation sizing – EnEv (German) or WT2022 (Polish) recommendations, depending on the market-language version

DESIGNING INSTALLATIONS WITH FLAT STATIONS

• dimensioning of the primary network supplying flat stations, taking into account non-simultaneous demand of the medium for domestic hot water preparation in a plate heat exchanger, according to the TU Dresden or DIN 1988-300 method (the second one requires the water system calculation module in the package configuration)

BALANCING THE INSTALLATION WITH PREDEFINED CONTROL LOOPS

• according to the manufacturer’s guidelines

CALCULATION OF DESIGN FLOW RATES

• DIN 1988
• DIN 1988-300:2012-05
• PN-92/B-01706
• EN 806-3:2008

PIPELINE NETWORK CALCULATIONS

• Hydraulic calculations – Darcy and Colebrook equations
• Diameters sizing – maximum velocity criterium
• Heat loss in pipelines – according to professional literature
• Pipeline insulation sizing – EnEv (German) or WT2022 (Polish) recommendations

CIRCULATION NETWORK CALCULATIONS

• Diameters sizing – maximum velocity and maximum R criteria
• Hydronic balancing – proprietary method

RING SYSTEMS CALCULATIONS

• Proprietary method using Cross method and DIN 1988-300 recommendations

CALCULATIONS OF WARM WATER OUTPUT TIME

• Proprietary method considering Swiss guidelines
• Evaluation of results according to VDI 6003 or DIN 1988-200

Calculation of waste water flow:

• EN 12056-2, optionally DIN 1986-100

Selection of pipes diameters:

• EN 12056-2, optionally DIN 1986-100

Ventilation:

• EN 12056-2, optionally DIN 1986-100

• • Hydraulic calculations – Darcy-Weisbach, Walden and Colebrook equations

CALCULATIONS OF PIPES COMPLETELY FILLED

• due to Colebrooke-White’s formula

PIPE DIAMETER SIZING

• considering the maximum speed (Vmax) and the maximum unconsolidated frictional resistance (Rmax) values

NETWORK ARRANGEMENT

• authorized algorithm considering the boundary conditions (min/max cover and declines), and collisions

LOCAL FRICTION

• enabled by the ability of declaring dzeta value for water pipe network junction

STREAM OF STORMWATER (QD)

• PN EN 752-4 Standard
• Karl and Klauss R. Imhoff: Urban Drainage and Wastewater Disposal

HYDRAULIC CALCULATIONS OF PARTLY FILLED PIPES (Qs, Qd)

• flow calculation due to Bretting’s formula
• pressure drop calculation due to Prandtl-Colebrook formula

SELF-DEFECATION

• due to the method of boundary shear stress

PIPE DIAMETER SIZING

• considering sum of streams (Qs and Qd) and fill ratio

NETWORK ARRANGEMENT

• authorized method which meets required minimum and maximum depth gradient and collisions with other networks

LOCAL FRICTION

• considering roughness of pipes taken from catalogue data or from ATV-DVWK A110P standard

PUMPING STATIONS

• based on: Karl and Klauss R. Imhoff: Urban Drainage and Wastewater Disposal and authorised method

HYDRAULIC CALCULATIONS OF COMPLETELY FILLED PIPES

• due to Colebrooke-White’s formula, Qs and Qd values are directly added up

PIPE DIAMETER SIZING

• considering the maximum speed (Vmax) and the maximum unconsolidated frictional resistance (Rmax) values

NETWORK ARRANGEMENT

• authorized algorithm considering the boundary conditions (min/max cover and declines), and collisions

LOCAL FRICTION

• not considered