All features

All our software features

An overview of what Hysopt can do for your HVAC installation design, calculation, simulation and evaluation.

Detailed design

Detailed design


  • Application : hydraulic heating and cooling installations , district heating networks, geothermal energy storage

Fast and intuitive configuration of HVAC installations:

  • Fast model-building using the Base Circuit Methodology
  • Re-use of concepts and models via own models library or the Hysopt Inspiration Library
  • All possible hydraulic circuits and combinations: mixing circuits, mixing injection, diverting circuits, cascade configurations, open headers, storage tanks, heat exchangers, unlimited number of pumps and circuits,…
  • Specific circuits for hybrid generation
  • Design of installations with satellite units (HIU, Heat Interface Unit), in accordance with the diversity standard

Model validation:

  • Reporting inconsistencies in the model, incomplete model and supervision
  • Reporting unrealistic parameter input

System check, troubleshooting:

  • Reporting conceptual design faults (interaction of pumps, missing balance valves, incorrect combination of hydraulic circuits,…)

Hysopt Inspiration Library

  • More than one hundred HVAC design templates, covering a wide range of applications and based on the vast experience of the Hysopt engineering consultants in designing and optimising systems
  • Each template is described extensively in the documentation Wiki, with additional info about how to implement each template and the motivation of the design choices behind
  • An advanced and user-friendly search engine to easily explore the contents of the library and quickly filter out the most relevant template for your project

Canvas management:

  • Connecting different canvasses to keep a good overview in large projects

Floor plan:

  • Read in floor plans (.pdf and .dxf) to scale
  • Implement end units
  • Automatic pipe length generation


  • Very fast and flexible updating of design criteria, both comprehensive and differentiated or via tags
  • Multilayer approach for heating, cooling, controls,…
  • Adding text fields, working with tags

Calculation, components

Calculation, components

Propagation of thermal powers, flow rates, temperatures, regimes:

  • cooling
  • heating
  • domestic hot water (satellite units and boilers with supply coil), concurrent flow rate propagation according to diversity standards

Aggregation methods for central heating and simultaneous hot water flow:

  • average weighted method
  • max method

Diversity calculation methods for domestic hot water and central heating:

  • domestic hot water: German DIN 1988-300 for appartments, German DIN 1988-300 for hotels, German DIN 1988-300 for hospitals, Danish code of practice DS 439, Swedish regulation DHA F:101, Swedish regulation F:101 for high DHW demand, French Costic MTA 2016
  • central heating: CIBSE CP1.2, customisable logarithmic method

Pipe selection:

  • In accordance with the desired design criteria (maximal or target pressure drop, maximal velocity)

Pipe types:

  • Steel pipes (welded): NBN EN 10220/10255
  • Steel pipes (seamless): NBN EN 10255/10255
  • Steel pipes (presicion): NBN EN 10305-1 and NBN 10305-2
  • Copper pipes: NBN EN 1057 and NBN EN 13349
  • Multilayer: NBN EN 15874-2, NBN EN 15875-2, NBN EN 15876-2, NBN ISO 21003-2
  • Epoxy pipe
  • HDPE 100 SDR 11

Customizable pipe types, configurable parameters:

  • material lambda
  • outer diameter
  • inner diameter
  • absolute roughness
  • insulation lambda heating
  • insulation lambda cooling
  • insulation thickness heating
  • insulation thickness cooling

Powerful computer algorithms for optimal component selection in the whole installation:

  • End units: radiators, convectors, floor heating, heat exchangers,…
  • Combined iterative optimisation of all pumps, control valves, balance valves, autoflow, PICV (Pressure Independent Control Valve), DPCVs (Differential Pressure Control Valves) in the whole installation, taking into account (VDI 2073, VDMA 24199:2005-05):
    • Desired valve authority (2-way valves, 3-way valves)
    • Optimised minimum pump head for all pumps
    • Hydraulic balance
  • Possibility to partially or fully block design variables in case of renovation projects
  • Component selection: generic and/or manufacturer-specific

Tools for hydraulic balancing:

  • Balance valve calculation and presetting
  • Strategic balancing in very large installations
  • Dynamic pressure compensation

Design analysis:

  • Analysis of real flow rates versus design flow rates
  • Analysis of pressure drop designs
  • Analysis of average temperatures
  • Analysis of real valve authorities versus minimum authorities

Static partial load analysis:

  • Visualisation of real flow rates and impact on installation by manually adjusting the stroke of a control valve
  • 2-way valves, 3-way valves, open/close valves,…



Dynamic simulation of system variables:

  • Transient simulation and graphs of pressures, flow rates, temperatures, thermal powers, heat flows, control signals,…
  • At every possible location in the installation
  • Stepsize of 30s
  • Simulation period from one day up to twenty years

Full year weather profiles:

  • Hysopt contains weather data from more than 3000 locations worldwide, based on the International Weather for Energy Calculations (IWEC) Version 2.0. Copyright © 2012 Ashrae ( Used by permission.

Usage patterns for central heating and domestic hot water:

  • Central heating: continuous, unimodal, bimodal, and trimodal patterns
  • Domestic hot water: EcoDesign S, EcoDesign M, EcoDesign L, EcoDesign XL, EcoDesign XXL tapping patterns
  • Tapping pattern generation according to the applied diversity calculation method

Implement control strategies and techniques:

  • Heating curves, economisers
  • Room temperature compensation
  • P, PI controllers and freely adjustable setpoint profiles
  • Thermostats, room controllers,…
  • Cascade control
  • Control of hybrid generation: boilers, heat pumps, CHP (Combined Heat and Power),…

Analysis of dynamic control behaviour:

  • Analysis of control circuits: stability, speed, accuracy
  • Hydraulic interactivity between components
  • Generator behaviour, start/stop optimisation

Simulation of energy consumption and comfort (control behaviour):

  • Simulation period from 1 day up to 20 years
  • Thermal comfort (graphs, Room Temperature Lack & Excess)
  • Energy consumption:
    • Generators
    • Pumps
    • Thermal pipe losses
  • Efficiencies:
    • Production efficiency, system efficiency, distribution efficiency
    • Possibility of investment analysis, LCC (Life Cycle Cost)

Parallel simulation of various alternatives

Sensitivity analysis on design parameters and impact on KPIs

Simulation techniques:

  • Real Time Simulation
  • Imposed Load Simulation



Pareto Dashboard

  • Compare system concepts
  • Gain insight in different KPIs
  • Fast and automated
  • Visual comparison on specific KPIs
  • Pareto Front with optimal concepts


  • Bring transparency to the design proces
  • Guidance in making the right design choices


  • Energy consumptions, savings and efficiencies
  • Energy cost and savings
  • CO2 emissions and reductions
  • Production share of different energy sources
  • Other performance indicators relevant to a project


  • Comfort classifictation based on ‘Fanger Theory’
  • 4 different comfort classes
  • General comfort percentage
  • Comfort improvement between different models


  • Costs vs Savings
  • Net Present Value, Payback period and Internal Rate of Return
  • Discounted figures


Import, export, sharing

Import, export, sharing

Export functions:

  • Bill Of Materials, BOM (.csv, Excel)
  • Hydraulic balance report, report of real hydraulic versus theoretical balance (Excel)
  • Pump report with calculation note for pump heads and loop pressure drops (Excel)
  • Hydraulic scheme (.pdf, .dxf)
  • Installation report including presets (Excel)
  • Graphs of pressures, flow rates, temperatures, thermal powers, heat flows, control signals,… at every possible location in the installation (Excel)
  • Energy report containing detailed analysis energy consumption, energy costs, CO2 emission (excel)

Import functions:

  • Custom pipe types (.xml, Excel)
  • Custom pressure profiles for pipes with maximum velocity, maximum pressure loss per meter, target pressure loss (.xml, Excel)
  • Custom behaviour for BCs including: (.csv)
    • Custom UA value matrices for satellite units
    • Custom efficiency table for boilers
    • Custom pump head curves for pumps
    • Custom pump efficiency curves for pumps
    • Custom COP and power tables for heat pumps


  • Model sharing to facilitate collaboration between accounts and companies