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Hysopt Knowledge Center

Release Notes

Archive 2016
Archive 2017
Archive 2018
Archive 2019
Archive 2020
Archive 2021
Archive 2022
Welcome

How to use the Hysopt wiki
Guided Trial License Exercise

Basic Hysopt Usage

Getting started with Hysopt

Managing Hysopt License
Hysopt Demo - Video Presentation
First login & Resetting password
Creating your first project
The Hysopt anatomy
Unit conversions in Hysopt

P&ID Modeling

How to model your system
Canvas management, Floor plan manager and Layers
Assigning tags and searching for tags and/or IDs
Parametrisation/Changing design parameters

Calculation

System Check

Algorithm

Compute design flows

Diversity and Aggregation

Within a single dwelling

Step 1 : recalculation of the tapflows
Step 2 : calculation of the diversity factor and the diversity flow
Step 3 : calculation of the DHW flow and DHW power at CH side, influenced by a regime changing component like a heat exchanger, HIU, storage tank, ...
Step 4 : aggregation of the DHW flow/power with the CH flow/power at CH side

Multiple dwellings

Step 5 : propagate power, flows and temperature regimes over multiple dwellings and branches
Step 6 : aggregation of the DHW flow/power with the CH flow/power

Diversity standards for DHW

Based on DIN 1988-300
Based on the CIBSE CP1 2020 / Danish Code of Practice DS 439
Based on the Swedish regulation DHA F:101
Based on the Cibse CP1 2015 / Danish Code of Practice DS 439
Based on the French DTU 11-60
Based on the French Costic MTA 2016

Diversity standards for central heating / space heating

Based on the CIBSE CP1 2020 / Varme Stabi 7th edition
Based on a logaritmic function

Parameter validation

Select pipes
Optimise components

Exports

Hysopt pages

Sensitivity Analysis

Pareto analysis: usage

Pareto analysis: calculations
Pareto analysis : change-over

New wiki: Inspiration Library - Wizard

Input Parameters

Control strategy - input parameters

Set Point Profile

Heating & Cooling Library - Input Parameters

Pipes - Input Parameters
KV-value
Radiator Parameters

Partial load analysis
User preferences
Message Overview

Simulation

Control validation

Imposed Load Simulation (ILS) error codes and common mistakes

Real-Time Simulation (RTS) versus Imposed Load Simulation (ILS)

Dynamic simulation
Experimental settings

Component overview

Heating Library

Production Heating

Boilers
CHP (Combined Heat & Power)

Heat pump

Air source vs. Ground source heat pump (under construction)
Heat pump booster
Gas absorption heat pump
Heat pump for heating and cooling
Reversible heat pump
Polyvalent four-pipe heat pump

Hybrid production Heating

Parallel
Serial
Shunt

Header configuration: Heating

Thermal storage heating

Thermal storage sizing algorithms

Distribution circuits

Dividing circuits
Mixing circuits
Throttle circuits
Balance valves
Control valves
Control valve authority

Piping

Heating reverse return (Tichelmann)

Pumps
District Heating

End units and heat exchangers

Radiator/Convector
Satellite units and simultaneous flows
Heat exchangers (HX)

Ambient exchange

Dry cooler 1.0
Dry cooler 1.1
Dry cooler 1.2
Evaporative cooler 1.0
Evaporative cooler 1.1
Evaporative cooler 1.2

Hybrid emission

System peripheral

Design conditions override
Sensors
Expansion vessel

Composite Base Circuits

Cooling Library

Production Cooling
Hybrid production Cooling
Header configuration: Cooling
Thermal storage: Cooling

Change-over Library

Change-over systems

End-units for change-over

Change-over end-unit

NEW - Ventilation Library
Zone library

Control library

Generator

Constant
Temperature constant
External temperature / relative humidity
Heating curve (with displacement)
Ramp
Activation signal generator
Setpoint generator
Sine wave
Time
Tap profile generators
Data files

Controller

PI controller
Modulating room controller for heating/cooling (Thermostat)
On/off room controller for heating/cooling
Thermostatic room controller for radiators
Programmable controller ((extra) large)

Operators

Activator
Comparison
Difference
Hysteresis
Hysteresis (temperature)
Integrator
Minimum/Maximum
Multiply
Negative
Piecewise linear function / function expression
Scaling and truncating
Sum
Low pass filter
Delay
Loopback

Boolean AND/OR/NOT
Graphing
Meter boxes
Unit conversion block
Overrides

Text Library

Projects from start to finish

Conceptual study

Flow charts - Conceptual
Step 1: Preparations

Step 2: The reference model

Plant Room

End units

Capacity controlled Air Handling Units

Control strategy

Step 3: Checking the reference model
Step 4: Load matching

Step 5: Design of alternatives

Step 5.1: Hydraulic optimisation
Step 5.2: Downsizing
Step 5.3: Implementing Inspiration library models
Step 5.4: Pareto-analysis and reporting

Detail Study

Flow charts - Detail model
Step 1: Checklist & Implementing floor plans
Step 2: Drawing the model: Floor plans & P&ID
Step 3: Calculating & troubleshooting your model
Step 4: Reporting (component selections etc.)

Control strategies in the inspiration library

Controllers and code

Inspiration Library - Templates

Production Templates - Heating

Boiler

New Wiki - Basic boiler controls
Cascade configuration of 2/3/4 boilers
Large water content (direct)
Small water content (low loss header)

Solar
Biomass boiler

Production Templates - Cooling

Hybrid production

New Wiki - Solar & Boiler
Biomass boiler & Gas boiler

Domestic Hot Water (DHW)

New Wiki - DHW storage tank
Heat Interface Unit (HIU)

Header configuration

Controls

Pump control

Basic pump control
Advanced pump control

Room control

Change-over examples

CHPs

CHP combined with boilers - Multiple configurations

CHP & Boiler configurations

CHP & Boiler - Parallel configuration
CHP & boiler - Serial configuration
CHP & Boiler - Reverse shunt in return configuration
CHP & Boiler - Reverse shunt in supply
Boiler & CHP - Reverse shunt in supply

CHP - Basic Control

Heat Pumps

HP Basic control strategies

Heat Pump - On/off Control
Air Source Heat Pump - Modulating
Heat Pump stages

Cascade configuration of heat pumps

Heat Pump (HP) & Boiler

HP & Boiler - Parallel configuration
HP & Boiler - Shunt configuration
HP & Boiler - Serial configuration
HP & Boiler - Switchable serial Configuration

Aquifer Thermal Energy Storage (ATES)

ATES 1.2
ATES 2.1

Aquifer Thermal Energy Storage (ATES) templates

ATES 1.2 templates
Geothermal energy storage templates

Borehole Thermal Energy Storage (BTES)

BTES 1.0
BTES 1.4

Borehole Thermal Energy Storage (BTES) templates

BTES 1.0 templates
BTES 1.4 templates
BTES load matching

Error/warning overview

System check error

This base circuit is reversed
Pumps found upstream/downstream of this pump
Pump found in variable part of dividing circuit
Pump in variable part of mixing circuit
No pump to provide flow to the primary side of this hydraulic separator
Pumps found after ...
Pump missing on ... / no pumps over ...
Both of the ... ports should have a pump
Serial pumps on/after ...

Power propagation error

Supply temperature mismatch
Could not resolve power progapagation for this node
UA value and primary return/air volume flow are both locked
Illegal combined power parameter state
Different applications conjoined at this point
Both supply and return temperatures are overridden

Component selection error

Authority smaller than minimal required authority
KVS value et to zero
Fixed pressure drop lower than required pressure drop
Pump head not enough for pressure loss
Total pressure drop larger than 20 bar
No pumps provide pressure for this control valve
Both pump head and pump curve are locked
Design flow rate out of range of pump curve
Heat exchanger supply/return temperatures too close together
No suitable KVS value found
No suitable valve position can achieve desired mixing ratio
Short circuit on premix by-pass
... has pump downstream
No pumps expected

Simulation error

Failed to parse code/expressions
Total losses through windows are larger than design heat load
The volume of the zone is zero
Invalid column name in CSV file

Frequently Asked Questions

Functional questions
Technical specification questions
Folder structure and project identification

Usage of the software

Changing boiler efficiency (with templates)
Visualisation of all parameters in dynamic simulation of >1 month
Implementation of photovoltaic installation data in the simulation environment of Hysopt.

Operations (Shortcuts)
How to use toggle auto-connect
How to execute a site survey with all needed information to feed into Hysopt

Certifications and Awards

CIBSE Building Perfomance Award 2020
Validated by ISSO
Mollier diagram license

Login
Hysopt Academy
Contact Support
Free Trial
Explore the Software
Speak with Sales

Main

Release Notes

Archive 2016
Archive 2017
Archive 2018
Archive 2019
Archive 2020
Archive 2021
Archive 2022
Welcome

How to use the Hysopt wiki
Guided Trial License Exercise

Basic Hysopt Usage

Getting started with Hysopt

Managing Hysopt License
Hysopt Demo - Video Presentation
First login & Resetting password
Creating your first project
The Hysopt anatomy
Unit conversions in Hysopt

P&ID Modeling

How to model your system
Canvas management, Floor plan manager and Layers
Assigning tags and searching for tags and/or IDs
Parametrisation/Changing design parameters

Calculation

System Check

Algorithm

Compute design flows

Diversity and Aggregation

Within a single dwelling

Step 1 : recalculation of the tapflows
Step 2 : calculation of the diversity factor and the diversity flow
Step 3 : calculation of the DHW flow and DHW power at CH side, influenced by a regime changing component like a heat exchanger, HIU, storage tank, ...
Step 4 : aggregation of the DHW flow/power with the CH flow/power at CH side

Multiple dwellings

Step 5 : propagate power, flows and temperature regimes over multiple dwellings and branches
Step 6 : aggregation of the DHW flow/power with the CH flow/power

Diversity standards for DHW

Based on DIN 1988-300
Based on the CIBSE CP1 2020 / Danish Code of Practice DS 439
Based on the Swedish regulation DHA F:101
Based on the Cibse CP1 2015 / Danish Code of Practice DS 439
Based on the French DTU 11-60
Based on the French Costic MTA 2016

Diversity standards for central heating / space heating

Based on the CIBSE CP1 2020 / Varme Stabi 7th edition
Based on a logaritmic function

Parameter validation

Select pipes
Optimise components

Exports

Hysopt pages

Sensitivity Analysis

Pareto analysis: usage

Pareto analysis: calculations
Pareto analysis : change-over

New wiki: Inspiration Library - Wizard

Input Parameters

Control strategy - input parameters

Set Point Profile

Heating & Cooling Library - Input Parameters

Pipes - Input Parameters
KV-value
Radiator Parameters

Partial load analysis
User preferences
Message Overview

Simulation

Control validation

Imposed Load Simulation (ILS) error codes and common mistakes

Real-Time Simulation (RTS) versus Imposed Load Simulation (ILS)

Dynamic simulation
Experimental settings

Component overview

Heating Library

Production Heating

Boilers
CHP (Combined Heat & Power)

Heat pump

Air source vs. Ground source heat pump (under construction)
Heat pump booster
Gas absorption heat pump
Heat pump for heating and cooling
Reversible heat pump
Polyvalent four-pipe heat pump

Hybrid production Heating

Parallel
Serial
Shunt

Header configuration: Heating

Thermal storage heating

Thermal storage sizing algorithms

Distribution circuits

Dividing circuits
Mixing circuits
Throttle circuits
Balance valves
Control valves
Control valve authority

Piping

Heating reverse return (Tichelmann)

Pumps
District Heating

End units and heat exchangers

Radiator/Convector
Satellite units and simultaneous flows
Heat exchangers (HX)

Ambient exchange

Dry cooler 1.0
Dry cooler 1.1
Dry cooler 1.2
Evaporative cooler 1.0
Evaporative cooler 1.1
Evaporative cooler 1.2

Hybrid emission

System peripheral

Design conditions override
Sensors
Expansion vessel

Composite Base Circuits

Cooling Library

Production Cooling
Hybrid production Cooling
Header configuration: Cooling
Thermal storage: Cooling

Change-over Library

Change-over systems

End-units for change-over

Change-over end-unit

NEW - Ventilation Library
Zone library

Control library

Generator

Constant
Temperature constant
External temperature / relative humidity
Heating curve (with displacement)
Ramp
Activation signal generator
Setpoint generator
Sine wave
Time
Tap profile generators
Data files

Controller

PI controller
Modulating room controller for heating/cooling (Thermostat)
On/off room controller for heating/cooling
Thermostatic room controller for radiators
Programmable controller ((extra) large)

Operators

Activator
Comparison
Difference
Hysteresis
Hysteresis (temperature)
Integrator
Minimum/Maximum
Multiply
Negative
Piecewise linear function / function expression
Scaling and truncating
Sum
Low pass filter
Delay
Loopback

Boolean AND/OR/NOT
Graphing
Meter boxes
Unit conversion block
Overrides

Text Library

Projects from start to finish

Conceptual study

Flow charts - Conceptual
Step 1: Preparations

Step 2: The reference model

Plant Room

End units

Capacity controlled Air Handling Units

Control strategy

Step 3: Checking the reference model
Step 4: Load matching

Step 5: Design of alternatives

Step 5.1: Hydraulic optimisation
Step 5.2: Downsizing
Step 5.3: Implementing Inspiration library models
Step 5.4: Pareto-analysis and reporting

Detail Study

Flow charts - Detail model
Step 1: Checklist & Implementing floor plans
Step 2: Drawing the model: Floor plans & P&ID
Step 3: Calculating & troubleshooting your model
Step 4: Reporting (component selections etc.)

Control strategies in the inspiration library

Controllers and code

Inspiration Library - Templates

Production Templates - Heating

Boiler

New Wiki - Basic boiler controls
Cascade configuration of 2/3/4 boilers
Large water content (direct)
Small water content (low loss header)

Solar
Biomass boiler

Production Templates - Cooling

Hybrid production

New Wiki - Solar & Boiler
Biomass boiler & Gas boiler

Domestic Hot Water (DHW)

New Wiki - DHW storage tank
Heat Interface Unit (HIU)

Header configuration

Controls

Pump control

Basic pump control
Advanced pump control

Room control

Change-over examples

CHPs

CHP combined with boilers - Multiple configurations

CHP & Boiler configurations

CHP & Boiler - Parallel configuration
CHP & boiler - Serial configuration
CHP & Boiler - Reverse shunt in return configuration
CHP & Boiler - Reverse shunt in supply
Boiler & CHP - Reverse shunt in supply

CHP - Basic Control

Heat Pumps

HP Basic control strategies

Heat Pump - On/off Control
Air Source Heat Pump - Modulating
Heat Pump stages

Cascade configuration of heat pumps

Heat Pump (HP) & Boiler

HP & Boiler - Parallel configuration
HP & Boiler - Shunt configuration
HP & Boiler - Serial configuration
HP & Boiler - Switchable serial Configuration

Aquifer Thermal Energy Storage (ATES)

ATES 1.2
ATES 2.1

Aquifer Thermal Energy Storage (ATES) templates

ATES 1.2 templates
Geothermal energy storage templates

Borehole Thermal Energy Storage (BTES)

BTES 1.0
BTES 1.4

Borehole Thermal Energy Storage (BTES) templates

BTES 1.0 templates
BTES 1.4 templates
BTES load matching

Error/warning overview

System check error

This base circuit is reversed
Pumps found upstream/downstream of this pump
Pump found in variable part of dividing circuit
Pump in variable part of mixing circuit
No pump to provide flow to the primary side of this hydraulic separator
Pumps found after ...
Pump missing on ... / no pumps over ...
Both of the ... ports should have a pump
Serial pumps on/after ...

Power propagation error

Supply temperature mismatch
Could not resolve power progapagation for this node
UA value and primary return/air volume flow are both locked
Illegal combined power parameter state
Different applications conjoined at this point
Both supply and return temperatures are overridden

Component selection error

Authority smaller than minimal required authority
KVS value et to zero
Fixed pressure drop lower than required pressure drop
Pump head not enough for pressure loss
Total pressure drop larger than 20 bar
No pumps provide pressure for this control valve
Both pump head and pump curve are locked
Design flow rate out of range of pump curve
Heat exchanger supply/return temperatures too close together
No suitable KVS value found
No suitable valve position can achieve desired mixing ratio
Short circuit on premix by-pass
... has pump downstream
No pumps expected

Simulation error

Failed to parse code/expressions
Total losses through windows are larger than design heat load
The volume of the zone is zero
Invalid column name in CSV file

Frequently Asked Questions

Functional questions
Technical specification questions
Folder structure and project identification

Usage of the software

Changing boiler efficiency (with templates)
Visualisation of all parameters in dynamic simulation of >1 month
Implementation of photovoltaic installation data in the simulation environment of Hysopt.

Operations (Shortcuts)
How to use toggle auto-connect
How to execute a site survey with all needed information to feed into Hysopt

Certifications and Awards

CIBSE Building Perfomance Award 2020
Validated by ISSO
Mollier diagram license

Breadcrumbs

Hysopt Knowledge Center
Component overview
Control library
Operators

On this Page

Negative

Symbol

Usage & working

The negative base circuit turns an input signal into a negative signal.

Pagination

Previous Page

Multiply
Next Page

Piecewise linear function / function expression

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