This webinar showcased the Loads Analysis capabilities within IESVE software.

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Rules of thumb – Out of date?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

13. Interoperability
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

15. Thank you
Any Questions?
eric.roberts@iesve.com
david.pierce@iesve.com