VE Application


Uses a flexible schematic component-based approach that enables you to quickly assemble HVAC plant and control systems.


The application is dynamically integrated with our thermal analysis tool ApacheSim.  This is vital in providing a building-integrated approach where the HVAC system and building are assessed as a whole; allowing all gains/losses, heat transfer and thermal mass in the building to be accounted for alongside system performance. 

Time steps down to 1 minute can be defined to capture detailed dynamics. You also have the option of combining detailed and idealised HVAC plant models for different rooms in the same model.

HVAC Systems Wizard

HVAC system creation can be streamlined in 4 easy steps. 

  • Simple and intuitive UI for system creation, assignment and calculations
  • Zoning, airside and waterside can be selected from list
  • Full HVAC systems including proposed and baseline models plus ASHRAE loads calculations, sizing and reports created within minutes

System Prototypes & Sizing Navigator

This workflow Navigator guides users through loading prototype system profiles and data, selecting systems, inputting system parameters and schedules of operation, and autosizing system equipment and controls. Systems can then be analyzed for minute-by-minute, hourly, daily and annual performance. This tool makes it easy to compare system alternatives from the earliest stages of design. 

The Navigator accelerates system setup for comparison of system alternatives from the earliest stages of design.  It also incorporates Quality Assurance (QA); saving users valuable time, and promoting easy team collaboration and training.

Multiplexing Feature

This unique functionality adds an extra dimension to the capabilities and productivity available in ApacheHVAC.  It enables engineers to easily deal with assigning HVAC data to very large, complex system models.  Multiplexing layers and tabular editing functionality facilitates fast and accurate data population with editing at global or individual levels.

HVAC systems

Some examples of typical & innovative systems that can be modelled in ApacheHVAC include:

  • Variable Refrigerant Flow (VRF) - water-source and air-source options
  • Heat transfer water loop with water-to-air heat pumps
  • VAV systems with state-of-the-art controls, air and water supply temperature resets, airside and waterside economizer/free cooling (WSE), demand-controlled ventilation (DCV), etc.
  • More pre-cooling options in chilled water loop, in addition to integrated waterside economizer
  • Ice tank thermal storage modeling capabilites within chilled water loops
  • Heat recovery from condenser water loops to hot water and heat transfer loops
  • Radiators & Chilled Ceilings now "see" hot and chilled water loop temperatures
  • Highly tailored system controls and configurations
  • Dedicated outside air systems (DOAS) with fan-coils, active/passive chilled beams, etc.
  • Air-source heat pumps, DX cooling, and unitary cooling (split systems)
  • Indirect-direct evaporative cooling systems (IDDE), desiccant-based air conditioning, etc.
  • Hybrid hydronic/air systems, radiant chilled/heated floors, ceilings, and panels
  • Underfloor air distribution (UFAD), displacement ventilation (DV)
  • Vented stack-effect double-skin facades, thermal labyrinths, and earth tubes
  • Mixed-mode systems with integrated control of mechanical and natural ventilation
  • Hollow-core slab systems

Some examples of particularly advanced systems which can be modelled in ApacheHVAC include:

  • Cutting-edge low-energy HVAC equipment, such as Dedicated Outside Air System (DOAS) with indirect-evaporative cooling and desiccant wheel regenerated by DX condenser coil
  • Nat vent plus CO2-based demand-controlled mechanical ventilation, active chilled beams, and radiant heating and cooling panels
  • HWL multiple secondary hot water loops with numerous features including independent secondary loop temperature, multiple secondary loops and scheduled load component

User Interface

Easy to use interface and component graphics provide fast and easy editing, customization and autosizing of HVAC systems.

  • Expanded import and export functions for saving and retrieving pre-defined and customized systems and equipment to and from the HVAC systems library
  • Easy-to-use drag & drop move and copy
  • Stretchable controller leads
  • New network drawing tools
  • Redesigned toolbars, including full set of system autosizing tools within the HVAC interface
  • OR connections extended to provide time switch ovveride functions

ISM Interface

Integrated System Management (ISM) interface is a simplified approach to accessing detailed HVAC system modelling parameters, making the use of ApacheHVAC easier and more efficient when reviewing and editing system details. A single dialog and tabular interface provides user-friendly access to editing inputs and viewing derived values for all significant airside HVAC system parameters.

System Parameters dialog

  • Improved access, layout, labelling, and editing of airside system parameters
  • Visual and text feedback for status of system edits, errors, and autosizing
  • Expanded tools and flexibility for ventilation, exhaust, and transfer air
  • Support for ASHRAE 62.1 Appendix A and ASHRAE 170 for Healthcare

System Parameters links

  • A robust and user-friendly system of selectable links for coupling the System Parameters dialog to a broad range of component and controller applications

Zones Tabular Edit dialog

  • Configurable spreadsheet-like tabular interface for editing, review, and QA
  • Import and export from spreadsheets

Prototype Systems Library

Pre-defined prototype systems require minimal user input and provide increased productivity. With fully editable pre-defined configurations, controls and equipment fully compatible with ISM, this library offers a valuable starting place for building custom systems.

  • Packaged terminal units
    • air-conditioning with DX cooling and hot-water boiler (PTAC)
    • heat pump with DX cooling and air-source heat pump (PTHP)
  • Single-zone air-conditioning units (CV or VAV)
    • DX cooling; direct-fired gas furnace heating
    • DX cooling; air-source heat pump, electric-resist. backup
  • Multi-zone VAV-reheat systems (can also run as CV)
    • DX cooling and hot-water coils/boiler(s)
    • DX cooling and parallel fan-powered (PFP) boxes with 2-stage electric re-heat
    • Water-cooled chiller(s), chilled-water coils, and hot-water coils/boiler(s)
    • Water-cooled chiller(s), chilled-water coils, PFP boxes with 2-stage electric re-heat
  • Dedicated outside air system (DOAS) with a range of possible zone-level units
    • Hot- and chilled-water (4-pipe) fan-coil units
    • Active chilled beams and fin-tube convectors or radiators
    • Four-pipe active beam induction units for both heating and cooling
  • Indirect-direct evaporative cooling VAV system, with HW reheat and CO2-based DCV
    • Coupling of 2-stage IDDE cooling SAT midbands to space cooling set points
  • Mixed-mode system: integrated control of mechanical and natural ventilation/cooling
    • Integration of setpoints in control profiles for fenestration openings and HVAC airflow in mixed-mode mechanical plus natural ventilation/cooling system
  • Chilled and heated ceiling panels with DOAS
  • Passive chilled beams with DOAS
  • Dual-fan, dual-duct VAV with zone-level mixing
  • Underfloor air distribution system
    • UFAD supply air plenum thermal zone
    • Separate occupied and stratified zones
    • Heat-pipe to deliver dry, moderately cool air
    • Underfloor series/parallel fan-powered boxes
    • De-stratification of space with heating airflow
    • Fixed or variable-volume diffusers
    • Leakage path to return
  • Improved import/export ability to create & save own custom systems to library
  • Chiller Performance Curve Library – a manufacturer specific, pre-defined library allowing you to:
    • Browse through the library
    • Customise and edit the curves
    • Make copies
  • Advanced Air to Air Heat Pump modelling
  • Free Convection Cooling Towers / Fluid Coolers

Input Data

  • Air-handling component parameters: coil duties, fan characteristics etc
  • Operation profiles
  • Radiator characteristics
  • Central plant part-load efficiencies
  • Controller parameters:
    • Sensed and controlled variables
    • On-off or proportional
    • Fixed or variable set-points
    • Set-points linked to other simulation variables via ‘formula profiles’
  • Boolean inputs from other controllers

Output Options

  • Results displayed in Vista and VistaPro, along with the weather data used to drive the simulation
  • A wide range of tables and graphs are produced for results analysis including monthly summaries, ranges or user-specified synopses and Psychrometric Charts.
  • System outputs at the component level, suitable for input to duct sizing and component selection and duct sizing software, include:
    • Air flow rates, temperatures and humidities
    • Air handling component loads
    • Component psychrometric processes
    • Room unit loads
    • Central plant loads
  • System performance indicators
    • System energy broken down by component or fuel
    • Carbon emissions
    • Performance at each node in the airside HVAC network in terms of air dry-bulb and wet-bulb temperatures, mass flow, volume flow, moisture content, relative humidity, and CO2 concentration
  • Room performance indicators include:
    • Room temperatures: air, mean radiant, dry resultant
    • Comfort indices: predicted mean Vote (PMV) and percentage of people Dissatisfied (PPD)
    • Room loads: heating, cooling, humidification, dehumidification
    • Load breakdowns: casual & solar gains, conduction and ventilation losses, plant inputs
    • Surface temperatures
    • Energy Consumption: Annual, Monthly, Hourly
  • ApacheHVAC System Loads & Sizing Report Generator:
    • Generate new and existing reports for any selected System Loads and Sizing results file
    • Set relevant coils for Heating & Cooling peaks
    • Include or exclude oversizing factors
    • Reports include:
      >> Project and climate (building, weather, etc.)
      >> Plant loops & equipment (capacity, flows, etc.)
      >> Space loads & ventilation (system summary)
      >> System Loads (detailed loads breakdown, coil capacities airflows, engineering checks, etc.)
      >> Zone Loads (same as for System)
      >> Room Loads (same as for Zones)
      >> VE2016 System Sizing report
      >> ASHRAE 62.1 Ventilation (Appendix A method)
  • Multiple results can be displayed simultaneously or aggregated
  • Results can be displayed in both metric or Imperial (US) units
  • Results can be exported to other windows applications for use in reports, presentations and further analysis
  • Export equipment schedule to csv (from HVAC system wizard)

  • Simulate typical & innovative HVAC systems with minimal effort.
  • Simulate simultaneously alongside building thermal analysis.
  • Detailed analysis of HVAC energy saving measures.
  • Extensive capability for modelling custom systems and controls.
  • Create detailed plant equipment models Component based HVAC system mimics the control of a detailed system.
  • Combine with MacroFlo for analysis of mixed-mode operation.
  • Optimise HVAC operation and minimise energy consumption and carbon emissions – get the system right for the building, budget and environment.
  • Exceptionally well suited to modelling mixed-mode and building-integrated systems, including double skin facades and earth-tube thermal pre-conditioning.
  • Pre-defined HVAC wizards, system prototypes autosizing and multiplexing features save significant input time. 
  • Linked to 3D model to ensure the dynamic interaction between the building and plant system is correctly simulated.
  • Direct interaction across thermal analysis, building loads, bulk airflow, solar shading and HVAC systems. 
  • System, Zone and Room Loads Report providing a comprehensive set of loads data, readily accessible in a compact yet clear and readable format.
  • Reports generated via Python scripts so all reporting can be automated.