MEP Engineering Analysis
Phân tích cơ điện (MEP)
Simulate pipe flow rates, calculate electrical loads and cable sizing, verify MEP system pressure and balance before detailed modeling.
Common tools
HAP (Carrier), Hevacomp, Revit-integrated MEP load calculators
Value delivered
Ensures correctly sized MEP systems from the start — avoids costly redesign
Adoption in Vietnam
Performed on large/complex projects (hospitals, data centers, high-rise residential).
Level of Information Need (LOIN)
G = Geometry · A = Alphanumeric · D = Documentation (ISO 7817-1:2024 method). A blank cell means this use sets no specific requirement for that discipline/stage.
| Discipline | Concept | Schematic | Developed | Technical | As-built / Operation |
|---|---|---|---|---|---|
| Architecture | — | — | — | — | — |
| Structure | — | — | — | — | — |
| Mechanical | — | G2·A2·D0 | G3·A2·D1 | — | — |
| Electrical | — | G2·A2·D0 | G3·A2·D1 | — | — |
| Plumbing | — | G2·A2·D0 | G3·A2·D1 | — | — |
Critical stages: Schematic · Developed
Rationale: MEP engineering analysis: HVAC load sizing, duct/pipe flow & pressure drops, electrical load calcs, hydraulic calcs. All three MEP disciplines need A2 from ST2 for preliminary sizing (equipment capacity, pipe/duct nominal sizes, flow rates). G2→G3 as systems are routed and sized. D1 at ST3 links engineering codes/standards.
What it really is
Extended MEP Engineering Analysis means running discipline-specific technical simulations directly on the BIM model to check and optimise ventilation and indoor air quality (IAQ), water supply and drainage, life-safety egress, and building acoustics — the technical analyses that fall OUTSIDE the three BIM Uses that already have their own workflow: structural analysis, energy analysis and lighting analysis. Unlike ordinary MEP modelling — which only places ducts and pipes in clash-free positions — engineering_analysis exploits the technical properties already attached to those objects (duct sizing, design flow rate, finish-material absorption coefficients, room function codes and occupant load) to run CFD simulations, hydraulic calculations, agent-based evacuation simulation, or reverberation-time calculation. The precondition is that the model already carries those technical properties from the design stage — otherwise the engineer has to rebuild a separate analysis model from scratch, severing the link to the source BIM. The core value is not one more PDF report, but results fed BACK into the model — updated duct sizes, finish materials, confirmed egress routes — so the next design stage inherits them correctly, instead of an analysis run on a stale model version and then forgotten on a project drive.
When to use
Worthwhile for works with demanding technical requirements or high occupant density — hospitals, high-rises, shopping centres, metro stations, auditoriums and theatres — where poor ventilation, a water-system failure, slow egress or weak acoustics carries consequences far beyond what an ordinary building can tolerate. Also worthwhile when the fire-authority review requires an evacuation simulation, or when a project pursues a green-building certification with IEQ (indoor environmental quality) criteria for ventilation and acoustics.
Prerequisites
- •Design Authoring completed at a LOIN sufficient to carry MEP technical properties — no generic models standing in for ducts, pipes or equipment
- •Applicable discipline codes and standards already identified: ventilation, noise, fire safety and egress
- •Discipline engineers (MEP, fire safety, acoustics) able to read the BIM model and configure the corresponding analysis software
- •Contract or BEP stating which analyses are mandatory and their pass criteria — since Decree 217/2026/NĐ-CP sets no specific requirement (Art. 8(2))
- •A clear boundary with the three BIM Uses that already have their own workflow: structural analysis, energy analysis, lighting analysis — to avoid scope overlap
Inputs
Design task team · .rvt / IFC
Appointing party · .pdf / .docx
Appointing party · competent authority · .pdf
Architect · fire safety engineer · .xlsx / .pdf
Appointing party · climate consultant · .epw
Acoustics task team · architect · .xlsx / .xml (OpenMAT)
Outputs
Ventilation and IAQ analysis report, with parameters updated in the MEP model
.pdf + cập nhật kích thước ống gió trong .rvt → MEP task team
Accepted when: Meets fresh-air flow rate and CO2 concentration thresholds under TCVN 5687:2024; parameters updated in the model, not left in a stand-alone report
Water-supply and drainage calculation report, with pipe diameters updated in the model
.pdf / .xlsx + cập nhật .rvt → Appointing party · cost task team
Accepted when: Pressure and flow meet requirements at every water outlet; drainage pipes are not overloaded under the peak-flow scenario
Egress simulation report with a recommended evacuation-route diagram
.pdf + hình ảnh trực quan xuất từ mô hình BIM → Appointing party · fire-authority reviewer
Accepted when: Required Safe Egress Time (RSET) is below Available Safe Egress Time (ASET) in every fire scenario tested; the diagram matches the approved architectural layout
Acoustic analysis report (reverberation time, noise level), with finish materials assigned absorption coefficients
.pdf + cập nhật thư viện vật liệu trong .rvt → Architect · appointing party
Accepted when: Reverberation time meets the recommendation for the space type; finish materials carry absorption coefficients in the model, traceable to each surface
General workflow
Prepare the model to a technical-property standard
Verify the MEP model uses the correct object types (ducts, pipes, equipment) and carries every property needed for analysis: sizing, design flow rate, room function codes, finish materials. One missing property means re-entering data by hand later.
MEP task team · Revit → Analysis-ready model
Define analysis scenarios and pass criteria
Determine which analyses are mandatory per the contract/BEP and map each to its threshold: TCVN 5687:2024 for ventilation, QCVN 26:2025/BNNMT for noise, the current fire-safety code for egress.
BIM Coordinator · discipline engineers · BEP and QCVN/TCVN criteria register → Analysis-scenario and pass-criteria register
Analyse ventilation and indoor air quality
Export room geometry and properties from the model to a CFD tool, run airflow and CO2-concentration simulations under natural and mechanical ventilation scenarios, and identify stagnant-air zones.
MEP engineer · Revit MEP · IES Virtual Environment (CFD simulation) → Ventilation and IAQ report
Calculate water supply and drainage
Run hydraulic calculations on the pipe network extracted from the model: pressure at the farthest outlet, peak drainage flow, and checking pipes are not overloaded under heavy rain or simultaneous demand.
Plumbing engineer · Revit MEP · AFT Fathom (hydraulic simulation) → Water-supply and drainage calculation report
Simulate egress in an emergency
Export building geometry to fire-simulation software to determine the Available Safe Egress Time (ASET), then to agent-based evacuation software to calculate the Required Safe Egress Time (RSET) using each area's actual occupant load.
Fire safety engineer · Revit (geometry export) · PyroSim · Pathfinder (fire and evacuation simulation) → ASET/RSET comparison and egress-route diagram
Analyse acoustics
Calculate reverberation time (RT60) per room from the model's geometry and finish materials; for spaces needing higher precision (auditoriums, concert halls), pass the model to dedicated acoustics software for a more detailed simulation.
Acoustics engineer · architect · Revit + Dynamo (in-model RT60 calculation) · ODEON / EASE (dedicated acoustic simulation) → Per-room acoustic report
Feed results back into the model
Update duct/pipe sizing, finish materials, room codes and the egress layout on the actual objects in the design model — do not let analysis results exist only as a stand-alone PDF.
Design task team · Revit (model parameter update) · Forma Data Management (CDE) → Design model updated with engineering parameters
Submit for approval and archive compliance records
Submit the analysis reports together with the updated model to the appointing party, and where required to the fire-authority reviewer, keeping them on the CDE so every party references the same record set.
Appointing party · Forma Data Management (CDE) · IFC export → Approved engineering-analysis record set
Diagram
↻ Results are not a stand-alone report — they must flow back into the model before the next design issue
Common pitfalls
The MEP model lacks technical properties (duct sizing, absorption coefficients, thermal load), forcing the engineer to re-enter data by hand for every analysis
Cause: The model was built only for clash-free coordination; no technical LOIN was defined for each analysis type
Fix: Define the technical LOIN for each analysis type in the BEP and verify it with an IDS check before running any analysis
Analysis results are run against a model version that is already stale compared with the latest design
Cause: The analysis model was split off to work separately, out of sync with the design model's version on the CDE
Fix: Tie every analysis run to the exact model version on the CDE and record the run date in the report
The analysis report exists as a stand-alone PDF while the architect keeps the original design unchanged
Cause: No mandatory process to update the model after results arrive — the analysis is treated as a sign-off formality, not a design tool
Fix: State in the BEP: every analysis must include a model-update step, signed off before the next design issue
Work is duplicated or dropped because scope overlaps with structural, energy or lighting analysis
Cause: The BEP does not clearly separate engineering_analysis from those three dedicated BIM Uses
Fix: State explicitly in the BEP: engineering_analysis covers only ventilation/IAQ, water supply/drainage, egress and acoustics — structural/energy/lighting have their own workflows
Measuring effectiveness
Compare RT60 calculated automatically from BIM geometry and materials (Sabine's formula) with manual theoretical calculation for the same room, across six octave bands from 125Hz to 4kHz
Benchmark: Average deviation of 0.23% with a 1% standard deviation, in a peer-reviewed study of a 17-storey educational building in Canada
Compare the PMV and PPD errors of a machine-learning model trained on CFD data against direct CFD simulation results, over 664 independent test samples
Benchmark: Average PMV error of 0.03–0.13; PPD error mostly under 5%, peaking at 5.52% in the hardest scenario — from a peer-reviewed study
Water-supply and drainage clashes caught through model-based clash checking, divided by the total clashes found project-wide including on site
Benchmark: no independent benchmark — set an internal target
Compare the RSET from agent-based evacuation simulation with the ASET from fire simulation, for the same scenario and the same egress layout
Benchmark: no independent benchmark — set an internal target
Legal basis
There is NO specific requirement for ventilation, water supply/drainage, emergency egress or acoustics analysis in Decree 217/2026/NĐ-CP — these analyses fall under Article 8 generally. Art. 8(1)(a) makes BIM mandatory for new-build works Grade II and above, from the feasibility-study or economic–technical report stage; Art. 8(2) assigns scope, content and information requirements to the contract — the basis for bringing each of these analyses into the EIR/BEP and setting the technical LOIN needed. The specific discipline requirements (ventilation under TCVN 5687:2024, noise under QCVN 26:2025/BNNMT, fire safety and egress under the current fire-safety code) sit in the discipline-specific code and standard system, not in Decree 217. The practical consequence: these analyses are a CONTRACTUAL obligation and a discipline-code obligation, not a separate statutory BIM obligation.
Sources
Only official sources (legislation, standards) and peer-reviewed academic work are cited. No vendor marketing figures or press sources. Reference only — does not replace legal advice.