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Using IESVE for
Room Loads
Analysis
Eric Roberts – Business Development Manager
David Pierce – Project Manager, VE Consultancy
15th May 2024
Welcome
Software Demonstration:
IESVE CIBSE Loads Methodology
Reporting of Loads Results
Dynamic Thermal Modelling for Loads
Apache Auto Sizing Capability
Q&A
www.iesve.com
www.iesve.com
Heating Load (Steady State Loss)
Q = A U (t i - t o )(0.33NV (t i - t o )
Cooling Load (Admittance Method)
Appendix 5.A10: Algorithm for the
calculation of cooling loads by means of
the admittance method
Introduction
Introduction
Heating and cooling loads used to size the
equipment size required to offset any room level
heat loss or gains.
Simple spreadsheet (or hand) calculations are
easily prone to errors
Rules of thumb – Out of date? Applicable to the
building?
IES’s CIBSE Loads tool considers:
Steady state heat loss calculations to predict
the heating requirements for the
zone/building.
A heat gain calculation, based on the
Admittance method, to predict the building
cooling requirements.
www.iesve.com
Introduction
Input Data Required for each zone cooling load calculation:
Latitude of building
Internal design temperature
Weather temperatures
Solar Radiation
Dimensions of each zone/room
Material properties
Construction properties (transmission)
Internal Heat Gains
Infiltration rate
Boundary Conditions
www.iesve.com
− IESVE is industry standard software which
enables users to quickly consider many aspects
of design (using a single model)
− Loads, BR Compliance, HVAC system sizing,
Building Operation, Daylighting, Energy and
Carbon
− 3D geometry, building activity library,
construction database
− Performs quick, informative, loads analysis on
any building type
IESVE
www.iesve.com
Applications
ModelIT
The single central 3D data model at the
heart of the VE provides geometry and
data shared by all applications.
APACHE
Originally dubbed APplication for Air-
Conditioning and Heating Engineers,
the user interface, rules processor and
the best whole-building energy
simulation engine in the world
SunCast
Calculate the position of the sun in the
sky, track solar penetration
throughout the building interior and
calculate shadows.
CIBSE Loads
Calculate heat loss and gain calculations
based on the CIBSE Guide.
www.iesve.com
This session will cover a live example:
− Creating the building geometry using
ModelIT
− Creating and assigning building/room
design and construction data using Apache
− Using CIBSE Loads, IES’s loads calculation
tool, to perform CIBSE heating and cooling
loads
− Viewing room and zone loads using VistaPro
Software Demonstration
www.iesve.com
Latitude of building
Orientation
Weather temperatures
Dimensions of each zone/room
Solar Radiation
Internal design temperature
Material properties
Construction performance
Heat Gains
Infiltration rate
Boundary Conditions
Results
Software Demonstration
VistaPro
SunCast
ModelIT
Apache
www.iesve.com
Building Loads Data
Heating Loads (Peak Heat Loss Calculation – considering
one single time frame)
Geometry, Fabric, Location & Weather, Htg Set Point,
and Infiltration
Cooling Loads (Peak Heat Gain Calculation – considering
each hour within 5 sample days throughout the summer
months)
Geometry, Fabric, Location & Weather, Clg Set Point,
Profiles, Solar Radiation, Internal Gains, and
Infiltration
www.iesve.com
− Internal Gains
− Set Points
− Solar Gains
− Controls / Thermostats
− Fan Coils
− Perimeter Heating
− Specific Plant
Thermal Zoning
www.iesve.com
− Weather - DSM uses Annual Weather file
not design weather data
− Gains – DSM includes both internal and solar
gains (CIBSE Heating loads do not)
− Profiles – CIBSE Heating loads are steady
state – DSM include profiles for building,
plant, occupancy and gains
− Unlimited System Capacities
Annual Loads
www.iesve.com
Interoperability
www.iesve.com
− Face to face training events
− Bespoke/project based training
− Application based live online training
− OnDemand video training
− VE Accreditation certificate
Training
www.iesve.com
Thank you
Any Questions?
eric.roberts@iesve.com
david.pierce@iesve.com

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Using IESVE for Room Loads Analysis - UK & Ireland

  • 1. Using IESVE for Room Loads Analysis Eric Roberts – Business Development Manager David Pierce – Project Manager, VE Consultancy 15th May 2024
  • 2. Welcome Software Demonstration: IESVE CIBSE Loads Methodology Reporting of Loads Results Dynamic Thermal Modelling for Loads Apache Auto Sizing Capability Q&A www.iesve.com
  • 3. www.iesve.com Heating Load (Steady State Loss) Q = A U (t i - t o )(0.33NV (t i - t o ) Cooling Load (Admittance Method) Appendix 5.A10: Algorithm for the calculation of cooling loads by means of the admittance method Introduction
  • 4. Introduction Heating and cooling loads used to size the equipment size required to offset any room level heat loss or gains. Simple spreadsheet (or hand) calculations are easily prone to errors Rules of thumb – Out of date? Applicable to the building? IES’s CIBSE Loads tool considers: Steady state heat loss calculations to predict the heating requirements for the zone/building. A heat gain calculation, based on the Admittance method, to predict the building cooling requirements. www.iesve.com
  • 5. Introduction Input Data Required for each zone cooling load calculation: Latitude of building Internal design temperature Weather temperatures Solar Radiation Dimensions of each zone/room Material properties Construction properties (transmission) Internal Heat Gains Infiltration rate Boundary Conditions www.iesve.com
  • 6. − IESVE is industry standard software which enables users to quickly consider many aspects of design (using a single model) − Loads, BR Compliance, HVAC system sizing, Building Operation, Daylighting, Energy and Carbon − 3D geometry, building activity library, construction database − Performs quick, informative, loads analysis on any building type IESVE www.iesve.com
  • 7. Applications ModelIT The single central 3D data model at the heart of the VE provides geometry and data shared by all applications. APACHE Originally dubbed APplication for Air- Conditioning and Heating Engineers, the user interface, rules processor and the best whole-building energy simulation engine in the world SunCast Calculate the position of the sun in the sky, track solar penetration throughout the building interior and calculate shadows. CIBSE Loads Calculate heat loss and gain calculations based on the CIBSE Guide. www.iesve.com
  • 8. This session will cover a live example: − Creating the building geometry using ModelIT − Creating and assigning building/room design and construction data using Apache − Using CIBSE Loads, IES’s loads calculation tool, to perform CIBSE heating and cooling loads − Viewing room and zone loads using VistaPro Software Demonstration www.iesve.com
  • 9. Latitude of building Orientation Weather temperatures Dimensions of each zone/room Solar Radiation Internal design temperature Material properties Construction performance Heat Gains Infiltration rate Boundary Conditions Results Software Demonstration VistaPro SunCast ModelIT Apache www.iesve.com
  • 10. Building Loads Data Heating Loads (Peak Heat Loss Calculation – considering one single time frame) Geometry, Fabric, Location & Weather, Htg Set Point, and Infiltration Cooling Loads (Peak Heat Gain Calculation – considering each hour within 5 sample days throughout the summer months) Geometry, Fabric, Location & Weather, Clg Set Point, Profiles, Solar Radiation, Internal Gains, and Infiltration www.iesve.com
  • 11. − Internal Gains − Set Points − Solar Gains − Controls / Thermostats − Fan Coils − Perimeter Heating − Specific Plant Thermal Zoning www.iesve.com
  • 12. − Weather - DSM uses Annual Weather file not design weather data − Gains – DSM includes both internal and solar gains (CIBSE Heating loads do not) − Profiles – CIBSE Heating loads are steady state – DSM include profiles for building, plant, occupancy and gains − Unlimited System Capacities Annual Loads www.iesve.com
  • 14. − Face to face training events − Bespoke/project based training − Application based live online training − OnDemand video training − VE Accreditation certificate Training www.iesve.com