Understanding SBEM Calculations, DSM, and Thermal Modelling for Building Compliance

At enevo, we provide a range of services to ensure your construction project complies with building regulations in a straightforward and hassle-free manner. One key aspect of compliance is meeting the energy efficiency requirements of Part L2 of the Building Regulations for non-residential buildings. Two primary methods for demonstrating compliance are SBEM Calculations and Dynamic Simulation Modelling (DSM)—but how do they differ?

What are SBEM and DSM?

Both SBEM and DSM use simulation programs to create a 3D model of a building, incorporating solar and weather data specific to its location. These tools analyse details such as building fabric, mechanical and electrical services, and zonal activities. DSM, however, goes a step further by including occupancy periods, HVAC schedules, and advanced thermal performance analysis.

SBEM Calculations: Simplified Building Energy Model

SBEM (Simplified Building Energy Model) calculates a building’s monthly energy usage and carbon dioxide emissions based on its geometry, construction materials, HVAC, and lighting. It provides a basic assessment of solar gain exceedance and must be conducted before and after construction to verify compliance.

Why SBEM Matters

• Environmental Impact: Estimates a building’s annual carbon emissions, helping developers make informed decisions.
• Efficiency Analysis: Assesses heating, cooling, ventilation, and lighting efficiency to ensure they meet regulatory standards.
• Thermal Performance: Encourages developers to insulate beyond the minimum requirements, benefiting both the environment and future occupants.

DSM & Advanced Thermal Modelling

DSM (Dynamic Simulation Modelling) takes energy assessments to the next level by using hourly weather data and detailed geometry modelling. Unlike SBEM, DSM accounts for:

• Building orientation and inclination at 1-degree increments.
• Internal openings and heat transfer between spaces.
• More accurate thermal bridging, daylight, and shading effects.
• Improved glazing and solar reflection modelling.

Additional Uses of DSM

Beyond compliance with Part L, DSM is widely used for Thermal Modelling and daylight calculations, particularly in BREEAM Assessments. At enevo, we offer specialized services including:

• CIBSE TM59: Residential Thermal Modelling to prevent overheating in homes, ensuring thermal comfort as temperatures rise.
• CIBSE TM52: Commercial Thermal Modelling for buildings without mechanical cooling, improving comfort in workspaces.

Which Projects Require SBEM, DSM, and Thermal Modelling?

• SBEM Calculations: Required for most new-build commercial properties over 50m², as well as some extensions and conversions.
• DSM Modelling: Used for complex building designs (e.g., buildings with atriums) that cannot be accurately assessed using SBEM.
• Thermal Modelling: Required for BREEAM assessments, local authority regulations, or government guidelines, applicable to both residential and commercial buildings.

Ensure Compliance with enevo’s Expert Services

Our team at enevo is here to help you navigate SBEM Calculations, DSM, and Thermal Modelling with ease. Whether you need compliance verification or a detailed energy assessment, we offer tailored solutions to fit your project’s needs.

Learn more: enevo SBEM Calculations Service
Learn more: enevo Thermal Modelling Service

Contact us today for a free consultation and ensure your project meets all regulatory requirements efficiently and cost-effectively.