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Service Overview
Energy Modeling That Turns Building Performance Into a Design Decision
Building Energy Modeling (BEM), also called building energy simulation, digitally predicts how a building's envelope, HVAC systems, lighting, equipment, occupancy and operating schedules influence energy consumption, peak demand, thermal loads, operational cost and carbon performance.
Desapex provides Energy Modeling and Simulation Services for new developments, existing buildings, retrofits and complex facilities. We use whole-building simulations to evaluate design alternatives, compare system performance and identify opportunities to reduce energy use before systems are specified, installed or modified.
Our approach goes beyond producing an energy model purely for compliance. We use energy simulation as an engineering design tool from the concept stage, allowing simulation results to inform HVAC system selection, equipment sizing, energy conservation measures and sustainability strategies. The Desapex MEP methodology specifically establishes this simulation-first philosophy and uses tools including HAP and EnergyPlus for whole-building analysis.
Energy models can support decisions around HVAC efficiency, building envelope performance, operating profiles, energy conservation measures (ECMs), renewable-energy strategies and the pathway toward lower operational carbon. They also provide structured evidence for relevant energy codes and green-building certification requirements.
For Desapex, sustainability is not a separate activity added at the end of design. It is integrated into MEPF engineering so that energy performance, carbon impact and long-term operational efficiency can influence design decisions from the beginning.
Our Digital-First Approach
Build the Digital Energy Baseline
We structure project geometry, climate data, envelope properties, occupancy, schedules, internal loads, HVAC systems and operating assumptions into a coordinated building energy model that reflects the intended design and use.
Simulate Whole-Building Performance
Using industry-standard tools including HAP and EnergyPlus, we simulate annual energy demand, heating and cooling loads and system performance to understand how the building is expected to perform before implementation.
Test, Compare & Optimize Design Scenarios
We evaluate alternative HVAC systems, equipment sizing, envelope strategies, operating parameters and energy conservation measures to identify solutions that improve building performance without relying on trial-and-error during construction.
Validate Compliance & Net-Zero Pathways
Energy performance can be evaluated against applicable requirements such as ASHRAE 90.1 and ECBC, while supporting energy documentation for LEED, IGBC and GRIHA and assessing renewable-energy and net-zero opportunities.
Convert Simulation Into Engineering Decisions
Instead of stopping at simulation results, we translate findings into actionable recommendations for MEP designers, owners and project teams—including prioritized ECMs, system-selection inputs, performance targets and implementation strategies.
Core Deliverables
What You Receive from Our Energy Modeling Services
At Desapex, our Energy Modeling and Simulation Services deliver actionable insights that help optimize building energy performance, improve HVAC efficiency, reduce operational costs, and support sustainable design decisions. Through advanced whole-building energy simulation using HAP and EnergyPlus, we evaluate energy consumption, compare design alternatives, and identify opportunities for energy optimization throughout the building lifecycle.
Our deliverables go beyond simulation reports, providing engineering teams, architects, and building owners with data-driven recommendations for energy-efficient building design, regulatory compliance, green building certification, and net-zero energy planning.
Our Key Deliverables Include:
Whole-Building Energy Simulation: Detailed analysis of annual energy consumption, peak loads, system performance, and Energy Use Intensity (EUI) to evaluate overall building efficiency.
HVAC Performance & Energy Optimization: Heating and cooling load calculations, HVAC system comparisons, and equipment sizing recommendations to improve energy efficiency and operational performance.
Energy Conservation Measures (ECMs): Identification, simulation, and prioritization of energy-saving opportunities through baseline-versus-proposed performance comparisons and design optimization.
Energy Code Compliance & Green Building Certification: Energy performance modeling aligned with applicable ASHRAE 90.1 and ECBC requirements, along with supporting documentation for LEED, IGBC, and GRIHA energy credits.
Net-Zero Energy & Renewable Energy Analysis: Evaluation of energy reduction strategies, solar PV sizing, renewable energy generation potential, and pathways toward net-zero energy buildings.
Energy Performance Reports & Recommendations: Comprehensive simulation results, performance comparisons, model assumptions, and actionable recommendations to guide sustainable building design and long-term energy management.
By integrating building energy modeling, MEP engineering, and simulation-driven design, Desapex transforms complex energy data into practical engineering decisions, helping clients develop energy-efficient, cost-effective, and future-ready buildings.
Why Choose Desapex
Simulation-First, Not Compliance-First
We start energy analysis early enough for the results to influence the project. This allows energy modeling to become an active design optimization tool, rather than a report created after major engineering decisions have already been made.
MEP Engineering + Energy Modeling + BIM in One Workflow
Energy performance is directly connected to the systems responsible for that performance. Desapex brings MEPF engineering, BIM, digital engineering and sustainability expertise into a connected workflow, reducing the disconnect between simulation recommendations and actual engineering design.
Decisions Backed by Measurable Performance Data
We use simulation to evaluate options before implementation—helping teams make evidence-based decisions around HVAC systems, capacity, energy conservation measures and sustainability strategies.
Industry-Standard Simulation Tools
Our workflow includes HAP and EnergyPlus for building-performance and whole-building energy simulation, enabling detailed analysis of loads, systems and energy consumption.
Designed for Compliance, Certification and Performance
Our approach can support applicable requirements including ASHRAE 90.1, ECBC, LEED, IGBC and GRIHA, while maintaining the larger objective of improving real building performance rather than simply achieving documentation compliance.
Lifecycle-Centric Engineering
Energy decisions made during design have consequences throughout an asset's operational life. Desapex evaluates energy performance with consideration for operating cost, carbon impact, maintainability, future optimisation and net-zero objectives, connecting design decisions with long-term asset value.
Unique Selling Proposition
Energy Modeling That Directly Influences MEP Design—Before Construction
Desapex combines whole-building energy simulation, MEP engineering and BIM-led digital delivery in one connected workflow.
Instead of delivering an energy model as an isolated compliance exercise, we use simulation results to inform HVAC system selection, equipment sizing, Energy Conservation Measures, code and green-building compliance, renewable-energy strategies and net-zero pathways.
The result is not simply a model of how much energy a building may consume. It is a data-driven engineering framework for designing a building that performs better.
Frequently Asked Questions
What is building energy modeling?
Building energy modeling is the digital simulation of a building's energy performance. The model uses information such as building geometry, climate, envelope properties, occupancy, lighting, equipment and HVAC systems to estimate energy consumption, heating and cooling loads and system performance under different operating conditions.
What is the difference between energy modeling and energy simulation?
When should energy modeling be performed?
Which software does Desapex use for energy modeling?
Can energy modeling support LEED, IGBC and GRIHA certification?
How does energy modeling help reduce HVAC energy consumption?
