{"id":119545,"date":"2026-05-18T05:00:44","date_gmt":"2026-05-18T03:00:44","guid":{"rendered":"https:\/\/ohmycad.com\/how-thermal-simulation-works-an-engineers-guide\/"},"modified":"2026-05-18T05:00:44","modified_gmt":"2026-05-18T03:00:44","slug":"how-thermal-simulation-works-an-engineers-guide","status":"publish","type":"post","link":"https:\/\/ohmycad.com\/en\/how-thermal-simulation-works-an-engineers-guide\/","title":{"rendered":"How Thermal Simulation Works: An Engineer&#8217;s Guide"},"content":{"rendered":"<\/p>\n<hr>\n<blockquote>\n<p><strong>TL;DR:<\/strong><\/p>\n<ul>\n<li>Dynamic thermal simulation offers precise analysis of transient behaviors and thermal inertia, essential for optimizing design in SMEs. It helps avoid oversizing, reduce costs, and improve comfort by integrating timestamped fluctuations of phenomena. Success relies on rigorous modeling, accurate input data, and appropriate training, facilitated by software integrated into the 3DEXPERIENCE platform.  <\/li>\n<\/ul>\n<\/blockquote>\n<hr>\n<p>Many engineers in SMEs still believe that modeling a product&#8217;s thermal behavior based on average values is sufficient. This is a costly mistake in practice. Understanding how thermal simulation works means grasping why classic static approaches systematically miss heat peaks, inertia effects, and seasonal overheating. This article explains the fundamental principles, implementation steps, available software, and the real benefits to expect\u2014so you can integrate this method from the design phase, not at the end of the chain.   <\/p>\n<h2 id=\"table-des-matieres\">Table of contents<\/h2>\n<ul>\n<li><a href=\"#principes-fondamentaux-de-la-simulation-thermique-dynamique\">Fundamental Principles of Dynamic Thermal Simulation<\/a><\/li>\n<li><a href=\"#les-%C3%A9tapes-cl%C3%A9s-pour-r%C3%A9aliser-une-simulation-thermique-efficace\">Key Steps for Effective Thermal Simulation<\/a><\/li>\n<li><a href=\"#logiciels-et-outils-pour-la-simulation-thermique-industrielle\">Software and Tools for Industrial Thermal Simulation<\/a><\/li>\n<li><a href=\"#applications-pratiques-et-b%C3%A9n%C3%A9fices-pour-la-conception-en-pme-industrielle\">Practical Applications and Benefits for Industrial SME Design<\/a><\/li>\n<li><a href=\"#pourquoi-la-simulation-thermique-dynamique-reste-sous-exploit%C3%A9e-en-pme-%3A-regard-d'expert\">Why Dynamic Thermal Simulation Remains Underutilized in SMEs: An Expert View<\/a><\/li>\n<li><a href=\"#int%C3%A9grez-la-simulation-thermique-gr%C3%A2ce-aux-solutions-logicielles-3dexperience\">Integrate Thermal Simulation with 3DEXPERIENCE Software Solutions<\/a><\/li>\n<li><a href=\"#questions-fr%C3%A9quemment-pos%C3%A9es-sur-la-simulation-thermique\">Frequently Asked Questions About Thermal Simulation<\/a><\/li>\n<\/ul>\n<h2 id=\"points-cles\">Key Points<\/h2>\n<table>\n<thead>\n<tr>\n<th>Point<\/th>\n<th>Details<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Dynamic Thermal Simulation<\/td>\n<td>It accurately models hourly heat exchanges throughout the year for a realistic representation of energy performance.<\/td>\n<\/tr>\n<tr>\n<td>Key Simulation Steps<\/td>\n<td>A structured approach to modeling, data collection, simulation, and calibration ensures reliable results.<\/td>\n<\/tr>\n<tr>\n<td>Specialized Software<\/td>\n<td>Tools like ThermoSysPro and CST Studio Suite enable advanced modeling adapted to industrial environments.<\/td>\n<\/tr>\n<tr>\n<td>Concrete Applications<\/td>\n<td>Simulation helps optimize equipment, reduce energy losses, and improve thermal comfort in SMEs.<\/td>\n<\/tr>\n<tr>\n<td>Importance of Calibration<\/td>\n<td>Adjusting the model by comparing it to real data is crucial for reliable technical forecasts and decisions.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"principes-fondamentaux-de-la-simulation-thermique-dynamique\">Fundamental Principles of Dynamic Thermal Simulation<\/h2>\n<p>Static simulation calculates an equilibrium state from averaged data: outdoor temperature, constant solar gains, uniform usage. It answers a simple question: \u201cHow many watts are needed to heat this room in winter?\u201d Dynamic thermal simulation, however, answers a much more useful question: \u201cHow will this product or building actually behave, hour by hour, throughout an entire year?\u201d  <\/p>\n<p>The operation of dynamic thermal simulation is based on solving differential equations at each time step. Specifically, the calculation engine models <strong>four phenomena simultaneously<\/strong>: <\/p>\n<ul>\n<li><strong>Conduction<\/strong>: heat transfer through solid materials according to their thermal conductivity (\u03bb)<\/li>\n<li><strong>Convection<\/strong>: exchanges between solid surfaces and moving fluids (air, water)<\/li>\n<li><strong>Radiation<\/strong>: emissions and absorptions of infrared energy between surfaces and the wall-sky<\/li>\n<li><strong>Dynamic thermal storage<\/strong>: a material&#8217;s ability to accumulate and release heat over time (inertia)<\/li>\n<\/ul>\n<p>This last point is often overlooked. The thermal inertia of a 20 cm concrete wall can shift the heat peak by 6 to 8 hours. A static simulation completely ignores this. The result: oversized HVAC equipment, systems that run wild in summer, and inexplicable operator discomfort in the middle of the day.   <\/p>\n<blockquote>\n<p><a href=\"https:\/\/www.etude-et-bilan-thermique.fr\/blog\/ingenierie-batiment\/simulation-thermique-dynamique\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Dynamic thermal simulation<\/a> accurately reproduces transient phenomena and thermal inertia, which are essential for precise comfort and consumption evaluation.<\/p>\n<\/blockquote>\n<p>The principles of dynamic thermal simulation require resolution over <strong>8,760 hourly steps<\/strong>, meaning hour by hour over 365 days. This temporal mesh captures real fluctuations: a solar radiation peak on an August afternoon, a production restart on Monday morning, an unusually cold night in November. These variations are exactly what your <a href=\"https:\/\/ohmycad.com\/cfd-fluids-simulation-tutorials\/\" target=\"_blank\" rel=\"noopener\">CFD tutorials<\/a> teach you to model correctly in specialized software.  <\/p>\n<p>For sizing industrial HVAC equipment, the difference is considerable. Dynamic simulation identifies the true peak demand, not the theoretical maximum demand. This helps you avoid purchasing equipment that is 20 to 30% too powerful\u2014a direct waste of investment budget.  <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/csuxjmfbwmkxiegfpljm.supabase.co\/storage\/v1\/object\/public\/blog-images\/organization-19386\/1778822226384_Infographie-etapes-simulation-thermique-dynamique.jpeg\" alt=\"Infographic: The Different Stages of Dynamic Thermal Simulation\"><\/p>\n<h2 id=\"les-etapes-cles-pour-realiser-une-simulation-thermique-efficace\">Key Steps for Effective Thermal Simulation<\/h2>\n<p>Understanding the theory is good. Knowing how to use thermal simulation in a real project is better. Here are the five essential phases:  <\/p>\n<ol>\n<li>\n<p><strong>3D Geometric Modeling<\/strong>: define homogeneous thermal zones (same use, same orientation, same wall type). A production hall and a control room cannot share the same zone, even if they are contiguous. <a href=\"https:\/\/ohmycad.com\/methodes-modelisation-3d-efficaces-industrie\/\" target=\"_blank\" rel=\"noopener\">3D modeling methods<\/a> allow direct import of CAD geometries to avoid re-entry.  <\/p>\n<\/li>\n<li>\n<p><strong>Input Data Collection<\/strong>: thermal characteristics of materials (\u03bb, \u03c1, Cp), precise architectural plans, hourly weather files in EPW format for the geographical area concerned, and actual usage profiles (occupancy schedules, internal loads related to equipment).<\/p>\n<\/li>\n<li>\n<p><strong>Numerical Model Construction<\/strong>: integration of all this data into the simulation software. This is a time-consuming but critical step. An error in the air permeability of an enclosure can skew consumption results by 15%. A structured <a href=\"https:\/\/ohmycad.com\/workflow-de-modelisation-efficace-guide-pratique-cao\/\" target=\"_blank\" rel=\"noopener\">CAD modeling workflow<\/a> reduces this risk.   <\/p>\n<\/li>\n<li>\n<p><strong>Annual Simulation Launch<\/strong>: the calculation covers 8,760 hours. Depending on the model&#8217;s complexity and available computing power, this takes from a few minutes to several hours. <\/p>\n<\/li>\n<li>\n<p><strong>Calibration with Real Measurements<\/strong>: <a href=\"https:\/\/edldiagnostic.fr\/isolation\/simulation-thermique-dynamique\/\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">the process includes calibration<\/a> by comparison with real measurements, ensuring reliability exceeding 90%. Specifically, you compare simulated results with meter readings, temperature probes, or CO\u2082 sensors, then adjust parameters until convergence. <\/p>\n<\/li>\n<\/ol>\n<blockquote>\n<p><strong>Pro Tip:<\/strong> Calibration improves confidence in results by 40 to 50%. In an industrial project where a bad decision on the cooling system costs tens of thousands of euros, this step is not optional. <\/p>\n<\/blockquote>\n<h2 id=\"logiciels-et-outils-pour-la-simulation-thermique-industrielle\">Software and Tools for Industrial Thermal Simulation<\/h2>\n<p>After reviewing the steps and methods, let&#8217;s look at the available tools. Not all thermal simulation software is equally suitable for your context. <\/p>\n<p><strong>ThermoSysPro<\/strong> (EDF) stands out for industrial thermohydraulic modeling. Based on the open-source Modelica language, it allows simulating complete multi-energy systems: power plants, heating networks, exchangers. <a href=\"https:\/\/www.edf.fr\/groupe-edf\/innover\/rd-un-savoir-faire-mondial\/nos-offres\/nos-logiciels-et-codes-de-calcul\/thermosyspro\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">ThermoSysPro models industrial thermohydraulic systems<\/a> over 8,760 annual hours, with documented energy savings of up to 25%. <\/p>\n<p>For building thermal simulation and industrial envelopes, EnergyPlus (free engine) and Pleiades (French-speaking interface) are frequently used. The <a href=\"https:\/\/ohmycad.com\/3dexperience-cst-studio-suite\/\" target=\"_blank\" rel=\"noopener\">CST Studio Suite<\/a>, integrated into Dassault Syst\u00e8mes&#8217; 3DEXPERIENCE platform, offers direct coupling between CAD geometry and thermal and CFD modules\u2014a major advantage for SMEs looking to avoid double data entry and data transfer errors. <\/p>\n<table>\n<thead>\n<tr>\n<th>Software<\/th>\n<th>Project Type<\/th>\n<th>Ease of Use<\/th>\n<th>CAD Integration<\/th>\n<th>Cost<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ThermoSysPro<\/td>\n<td>Thermohydraulic Systems<\/td>\n<td>Intermediate<\/td>\n<td>Low<\/td>\n<td>Free (open source)<\/td>\n<\/tr>\n<tr>\n<td>EnergyPlus<\/td>\n<td>Buildings, Envelopes<\/td>\n<td>Technical<\/td>\n<td>Partial<\/td>\n<td>Free<\/td>\n<\/tr>\n<tr>\n<td>Pleiades<\/td>\n<td>Buildings, Renovation<\/td>\n<td>Good<\/td>\n<td>Partial<\/td>\n<td>Commercial License<\/td>\n<\/tr>\n<tr>\n<td>CST Studio Suite \/ 3DEXPERIENCE<\/td>\n<td>Electronics, Industrial Thermal<\/td>\n<td>Good<\/td>\n<td>Native (Dassault)<\/td>\n<td>Commercial License<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Expected Features of Thermal Simulation Software in an Industrial SME:<\/p>\n<ul>\n<li>Direct import of CAD files (STEP, IGES, native SOLIDWORKS or CATIA)<\/li>\n<li>Comprehensive and editable material library<\/li>\n<li>Integration of EPW weather files by geographical zone<\/li>\n<li>Cartographic visualization of thermal flows and hot spots<\/li>\n<li>Export results to common reporting tools (Excel, PDF)<\/li>\n<li>Technical support in French and accessible documentation<\/li>\n<\/ul>\n<p>The flexibility of open-source libraries is often underestimated. With Modelica, you can create your own thermal components, share them among teams, and evolve them without depending on a single vendor. This is a strong argument for CFD and thermal software in an SME environment where resources are limited.  <\/p>\n<h2 id=\"applications-pratiques-et-benefices-pour-la-conception-en-pme-industrielle\">Practical Applications and Benefits for Industrial SME Design<\/h2>\n<p>Let&#8217;s now see how thermal simulation concretely changes your projects. The role of thermal simulation is not limited to producing regulatory reports. It becomes a decision-making tool in its own right.  <\/p>\n<p>First direct benefit: <strong>precise identification of heat losses<\/strong>. <a href=\"https:\/\/www.thermexcel.com\/french\/energie\/calcul_bilan_thermique.htm\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Simulation helps identify thermal bridges<\/a> responsible for 20% of heat losses, and avoid up to 30% oversizing of climate control systems. In a production unit where thermal control dictates part quality or operator safety, this level of precision changes everything. <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/csuxjmfbwmkxiegfpljm.supabase.co\/storage\/v1\/object\/public\/blog-images\/organization-19386\/1778821470093_Technicien-effectuant-audit-thermique-dans-atelier-industriel.jpeg\" alt=\"A specialist conducts a thermal diagnosis in an industrial workshop.\"><\/p>\n<p>Second benefit: <strong>scenario comparison<\/strong>. You can test the impact of different insulation thicknesses, various solar protections, or natural ventilation variants in just a few hours. Without simulation, each variant implies a costly prototype or poorly substantiated intuition.  <\/p>\n<table>\n<thead>\n<tr>\n<th>Criterion<\/th>\n<th>Static Simulation<\/th>\n<th>Dynamic Simulation<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Peak Load Accuracy<\/td>\n<td>\u00b130%<\/td>\n<td>\u00b15 to 10%<\/td>\n<\/tr>\n<tr>\n<td>Inertia Consideration<\/td>\n<td>No<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Real Climate Scenarios<\/td>\n<td>No<\/td>\n<td>Yes (EPW file)<\/td>\n<\/tr>\n<tr>\n<td>Calculation Time<\/td>\n<td>Minutes<\/td>\n<td>Hours<\/td>\n<\/tr>\n<tr>\n<td>Reliability for HVAC Sizing<\/td>\n<td>Low<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>Identifiable Energy Savings<\/td>\n<td>5 to 10%<\/td>\n<td>15 to 30%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Typical energy savings in industrial operations reach 15 to 30% thanks to design optimized by dynamic thermal simulation. For an SME with an annual energy bill exceeding 100,000 euros, even 15% represents an annual saving of 15,000 euros. <\/p>\n<blockquote>\n<p><strong>Pro Tip:<\/strong> Always integrate real thermal bridges (structural connections, wall penetrations) into your model. Their omission is the number one cause of discrepancies between simulation and real measurements in industrial projects. <\/p>\n<\/blockquote>\n<p>Third often-overlooked benefit: <strong>operator comfort<\/strong>. Recurring overheating in the workshop in summer is not inevitable. Thermal simulation allows <a href=\"https:\/\/ohmycad.com\/astuces-pratiques-optimiser-conception-3d-industrielle\/\" target=\"_blank\" rel=\"noopener\">optimizing industrial design<\/a> to reduce hot spots even before construction, with a direct impact on productivity and absenteeism rates.  <\/p>\n<h2 id=\"pourquoi-la-simulation-thermique-dynamique-reste-sous-exploitee-en-pme-regard-dexpert\">Why Dynamic Thermal Simulation Remains Underutilized in SMEs: An Expert View<\/h2>\n<p>We regularly assist industrial SMEs in integrating simulation tools, and the observation is always the same: the benefits are known, but implementation remains a barrier.<\/p>\n<p>The main reason is not the cost of licenses. It&#8217;s the <strong>quality of the input data<\/strong>. A dynamic thermal simulation is only as reliable as the information it is provided. Approximate plans, material characteristics from generic catalogs, or unmeasured usage profiles produce results that sound precise but do not correspond to reality. This is a classic trap: confusing the sophistication of the tool with the quality of the model.    <\/p>\n<p>Second real obstacle: <strong>team training<\/strong>. Knowing how to <a href=\"https:\/\/ohmycad.com\/guide-conception-3d-maitriser-3dexperience-2026\/\" target=\"_blank\" rel=\"noopener\">master 3DEXPERIENCE<\/a> and its thermal simulation modules requires an investment in skill development that many SMEs postpone. However, a team trained on two to three thermal software programs reduces its sizing errors measurably from the first projects.  <\/p>\n<p>Third point, more structural: thermal simulation is too often seen as a <strong>final verification<\/strong>, not as a design tool. The simulation is launched once the product is practically finalized, for validation. This is exactly the opposite of good practice. Integrated from the first design iterations, it guides material, geometry, and equipment choices before modification costs become prohibitive. This shift in approach, from \u201ccontrol\u201d to \u201cdesign tool,\u201d is the real cultural change to achieve.    <\/p>\n<p>Our conviction: investing in training and coupling thermal simulation with parametric 3D modeling from the outset is putting all the chances on your side to design better, faster, and with fewer costly rework.<\/p>\n<h2 id=\"integrez-la-simulation-thermique-grace-aux-solutions-logicielles-3dexperience\">Integrate Thermal Simulation with 3DEXPERIENCE Software Solutions<\/h2>\n<p>To put it into practice, discover how the 3DEXPERIENCE tools offered by Ohmycad can facilitate thermal simulation in your SME.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/csuxjmfbwmkxiegfpljm.supabase.co\/storage\/v1\/object\/public\/blog-images\/organization-19386\/1773680336928_ohmycad.jpg\" alt=\"https:\/\/ohmycad.com\"><\/p>\n<p>The 3DEXPERIENCE platform natively integrates CST Studio Suite for advanced thermal simulation, coupled with your parametric CAD models. You work in a single environment, without risky file transfers between software. <a href=\"https:\/\/ohmycad.com\/definir-la-cao-parametrique-pour-optimiser-votre-conception\/\" target=\"_blank\" rel=\"noopener\">Parametric CAD and thermal simulation<\/a> work together: a geometric modification automatically updates the thermal model, accelerating your design iterations. At Ohmycad, our team supports you in getting started, configuring workflows, and upskilling your engineers. Consult our 3D design tips to get off to a good start, or contact us directly for a demonstration tailored to your industrial context.    <\/p>\n<h2 id=\"questions-frequemment-posees-sur-la-simulation-thermique\">Frequently Asked Questions About Thermal Simulation<\/h2>\n<h3 id=\"quest-ce-que-la-simulation-thermique-dynamique-et-pourquoi-est-elle-preferable-a-la-simulation-statique\">What is dynamic thermal simulation and why is it preferable to static simulation?<\/h3>\n<p>Dynamic thermal simulation calculates hourly heat exchanges over an entire year, integrating material inertia and real weather data, whereas static simulation relies on simplified averages that consistently miss peaks and transient behaviors.<\/p>\n<h3 id=\"quels-sont-les-principaux-challenges-rencontres-lors-de-la-calibration-dune-simulation-thermique\">What are the main challenges encountered during thermal simulation calibration?<\/h3>\n<p>Calibration requires comparing results with real measurements (meters, probes) and adjusting parameters such as air permeability or internal gains, a demanding task that guarantees reliability exceeding 90%. <a href=\"https:\/\/www.neomag.lu\/simulation-thermique-dynamique-la-cle-d-une-renovation-reellement-optimisee.html\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Calibration increases confidence<\/a> in results by up to 50%.<\/p>\n<h3 id=\"quels-logiciels-sont-recommandes-pour-realiser-une-simulation-thermique-dans-un-contexte-industriel\">Which software is recommended for performing thermal simulation in an industrial context?<\/h3>\n<p>For complex thermohydraulic modeling, ThermoSysPro models over 8,760 annual hours with documented loss reductions of up to 25%. For direct integration with the CAD chain, CST Studio Suite in 3DEXPERIENCE offers the most fluid geometry-thermal coupling available today for industrial SMEs. <\/p>\n<h3 id=\"comment-utiliser-la-simulation-thermique-des-le-debut-dun-projet-de-conception\">How to use thermal simulation from the beginning of a design project?<\/h3>\n<p>Integrate thermal zones and material characteristics from the first 3D model, launch a preliminary simulation on representative climate scenarios, and use the results to guide insulation and equipment choices before structural decisions are finalized.<\/p>\n<h2 id=\"recommandation\">Recommendation<\/h2>\n<ul>\n<li><a href=\"https:\/\/ohmycad.com\/electrical-etape-00-parametrage\/\" target=\"_blank\" rel=\"noopener\">CATIA ELECTRICAL &#8211; Step 00: Parameterization &#8211; Ohmycad | SOLIDWORKS Partner<\/a><\/li>\n<li><a href=\"https:\/\/ohmycad.com\/exercice-cfd-transfert-thermique-cpu\/\" target=\"_blank\" rel=\"noopener\">CFD Exercise &#8211; Thermal Transfers in a CPU &#8211; Ohmycad | SOLIDWORKS Partner<\/a><\/li>\n<li><a href=\"https:\/\/ohmycad.com\/exercice-cfd-efficacite-de-lechangeur-thermique\/\" target=\"_blank\" rel=\"noopener\">CFD Exercise &#8211; Heat Exchanger Efficiency &#8211; Ohmycad | SOLIDWORKS Partner<\/a><\/li>\n<li><a href=\"https:\/\/ohmycad.com\/cfd-fluids-simulation-tutorials\/\" target=\"_blank\" rel=\"noopener\">CFD &#8211; Fluid Simulation Tutorials &#8211; Ohmycad | SOLIDWORKS Partner<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Discover how thermal simulation works to avoid costly errors. Integrate effective methods from the design stage! <\/p>\n","protected":false},"author":1,"featured_media":119546,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-119545","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-3dx-spot"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How Thermal Simulation Works: An Engineer&#039;s Guide<\/title>\n<meta name=\"description\" content=\"Discover how thermal simulation works to avoid costly errors. 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