# Presentation: 435009

## Extended BS-7: conversion to object/attribute/relationship sets

- How BS-7 will extend IFC 2.0 and 2.x ?
- How the data sets have been placed into the object hierarchy ?
- Ask reviewing BS-7’s draft 4 document

- Veijo Lappalainen
- VTT Building Technologyveijo.lappalainen@vtt.fi

## BS-7 Performance Validation

- The project involves identifying the static information required to construct "correct operation" reference models of selected HVAC subsystems/ products.
- The project extends the scope of IFC models to include this performance-related data as it evolves through the building's life-cycle.
- The focus of the project is simulation based performance validation methods, which facilitate better understanding of dynamic behaviour of building and its HVAC systems.
- The project focuses on radiator heating systems, air-handling units and cooled beams.
- Cross-chapter participation: No, GS, NA

## BS-7’s Scope

**Identification of performance information and sources within the life-cycle processes**
**Capture of performance information and interaction with IFC models in:**
*Design phase*
*Commissioning*
*Monitoring*
*Maintenance*
**Specification of IFC models/extensions to include performance data**
**Project will focus only on selected HVAC subsystems/products, which are radiator heating system and its defined components, air-handling unit and cooled beam**

**Other HVAC subsystems/products **
**Product manufacturing**
**Planning phase, highly qualitative information**
**Acquisition/analysis of building automation system data **

**Out-of-Scope**

## Status of BS-7

- Draft 4 documet has been completed and put to IAI’s FTP site for the 1st review 30.6.2000
- Revision of draft 4 will be made + pre-integration and final modeling started immediately after publishing of R2.x

## LC processes

**LC processes**

## Process Diagram: Design

**Process Diagram: Design**

## Example: AirHandler

- design

- product
- selection

- commissioning

- {operation}

- maintenance

- coil capacities (kW)

- fluid flow rates (kgs-1)

- coil surface area (m2)

- pressure-flow curves

- valve authority (-)

- flow rates (kgs-1)

- temperatures (oC)

- control signals (-)

- pressure drops (Pa)

- AirHandler:
- 	*Fan (supply and return)
- 	*CoilSubsystem (heat/cool coils)
- 	*HeatRecoveryUnit
- 	*MixingBox
- 	*Humidifier
- 	*AirFilter
- 	*Sensor
- 	*AirHandlerProperties

- simulation information:
- 	TRNSYS, HVACSIM+

## Example: CooledBeam

- CooledBeam:
- 	Heat Exchanger

- design

- product
- selection

- commissioning

- {operation}

- maintenance

- room temperature (oC)

- unit geometry (m)

- acoustic attenuation (Hz, dB)

- induced air flow rates (kgs-1)

- water flow rates (kgs-1)

- room temperatures (oC)

- HVAC supply air temperature (oC)

- pressure drops (Pa)

- heat exchange capacity (W)

- efficiency (%)

- simulation information:
- 	DOE2 model

## Conclusion

- Extensions to property sets of R2.x (Pset_AirHandler, Pset_Boiler) to be included in R2.x
- new property sets to extend the scope of IfcFlowEquipment object (Pset_Radiator, Pset_CooledBeam)
- should some property sets redefine as IFC-classes
- the range attribute of IfcHvacSensor is scalar it should be a pair of numbers (lower limit and upper limit)
- Pset_Coil should include electrical coil