IES Software Validation

Approved software solutions for international standards, methodologies, regulations and rating sytems

Standards

IES tools meet the following approved international standards.

ASHRAE 140: 2001, 2004, 2007, 2014
BEST TEST
CIBSE TM33
EU EN13791: July 2000
ANSI/ASHRAE/ACCA Standard 183
ISO 52000
ASHRAE 140 ANSI/ASHRAE/ACCA Standard 183

IESVE meets or exceeds all of the requirements of the ANSI/ASHRAE/ACCA Standard 183 which sets minimum requirements for methods and procedures used to perform peak cooling and heating load calculations for buildings except low-rise residential buildings.

IESVE uses the Heat Balance (HB) Method to calculate cooling and heating loads of rooms, zones or buildings, in order to comply with the Standard. The ASHRAE Heat Balance Method is detailed in Chapter 18 of the ASHRAE Handbook – Fundamentals as the preferred accurate method for load calculations. Standard 183 specifies calculation methods and requirements for: 

  • Section 5 - Weather Data and Indoor Design Conditions; including hourly solar radiation per all building room surfaces.
  • Section 6 - Cooling Load Method; including hourly convective & radiative heat gains and effects of thermal mass on the cooling load. 
  • Section 7 - External Heat Gains; including sensible & latent heat gains from infiltration, opaque building envelope components with thermal mass effects, and solar gain through fenestrations with/without accounting for effects of blinds, shades or drapes. 
  • Section 8 - Internal Heat Gains; including hourly sensible & latent heat gains, number of occupants & activity levels, diversity load factors and (recessed) lighting heat gain to a ceiling plenum. 
  • Section 9 - Heating Load; including infiltration, cold processes (e.g. refrigerated cases) and the optional inclusion from internal heat gains. 
  • Section 10 - System Cooling and Heating Loads; including duct leakage, fan & pump energy, heat transfer through pipes & ducts, diversity of occupants/equipment/lighting and pyschrometric processes for reheat, dehumidification, humidification, air-mixing & airside heat-recovery (e.g. ERV).  
ISO 52000

IESVE meets or exceeds the requirements of the ISO 52000 series of standards, and the locally adopted standards version such as the German DIN EN 12831 or United Kingdom BS EN 12831.

ISO 52000 series of standards contains a comprehensive method of assessing energy performance as the total primary energy used for heating, cooling, lighting, ventilation and domestic hot water of buildings. The standards specify calculation methods for the assessment of: 

  • the (sensible) energy need for heating and cooling, based on hourly or monthly calculations
  • the latent energy need for (de-)humidification, based on hourly or monthly calculations
  • the internal temperature, based on hourly calculations
  • the sensible heating and cooling load, based on hourly calculations
  • the moisture and latent heat load for (de-)humidification, based on hourly calculations
  • the design sensible heating or cooling load and design latent heat load using an hourly calculation interval
  • the conditions of the supply air to provide the necessary humidification and dehumidification

Methodologies

IES tools can undertake the following methodologies.

ASHRAE 90.1 Performance Rating Method (PRM): 2004/07/10/13/16
ASHRAE 90.1 Energy Cost Budget Method (ECM): 2010/13/16
ASHRAE 55 Calculation Procedure
ASHRAE 62.1 Calculation Procedure
CIBSE Guide A/ISO 7730 Calculation procedure
UK National Calculation Methodology (NCM)
U.S. Department of Energy

Approved the use of IESVE for Federal Incentives - IRS Code 179D - Originally enacted under the Energy Policy Act (“EPAct”). 

USGBC

IES is a LEED Automation partner. 

Regulations/Rating Systems

IES offers more approved software solutions for compliance than any other vendor. Covering multiple building regulations and rating systems across the globe.

California Energy Commission

Approved for Title 24 Non-residential Compliance. 

Florida Energy Commission

Approved for Commercial Energy Code Compliance. 

New York State

Approved for Energy Code Compliance.

South Africa National Building Regulations

Approved for Regulation XA3 of Part XA: Energy usage in buildings of the National Building Regulations.