MECHANICAL (HVAC) DESIGN · CASE STUDY
London Office Mechanical Design — Evidence
NATIVE REVIT / IESVE EVIDENCE — technical demonstration frozen; engineer approval outstanding
Evidence
Rows below come from the Workflow 1 closure acceptance matrix and the freeze record; each names its evidence folder and the SHA-256 of that folder's manifest.
M-5011 P07 Ventilation GA (native PDF)
Open PDF · PDF · 170 kBOne unchanged page of the native Revit PDF
Native output · sha256 cb6bbb7284e69536…
Native evidence and completeness matrix
| Result | Origin | Software · date | Verdict | Status | Source · evidence hash | Engineering approval |
|---|---|---|---|---|---|---|
| Run 4 room loads and plant dutiesLoadsNative IESVE loads for the 12-room synthetic office; basis of the accepted Run 4 calculations (closure 5.1). | Native tool output | IES VE 20262026-10-19 | PASS | validated | wf1-NATIVE-IESVE-RUN4-20261019-r3sha256 c7778f9a2ada… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Run 4 calculation and equipment workbooksCalculations9,762 formulas, 0 mismatches. The calculation workbook uses licensed CIBSE Guide C data and is LOCAL ONLY (not served). | Hexanta offline | Hexanta engine2026-10-21 | PASS | validated | wf1-STAGE4-WORKBOOKS-FINAL-20261021-r2sha256 08ce9ab12163… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Native Revit Stage 4 GA set P07DrawingsRun 117 / 117 automated checks; sheets 8 PASS / 2 PARTIAL on visual review (native DWG + PDF per sheet). | Native tool output | Autodesk Revit on APS Design Automation 20262026-10-21 | PARTIAL | validated | wf1-NATIVE-REVIT-APS-GA-20261021-fc372ee3-SHEETSsha256 5cec23cf6176… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Proposed native MEP model (P08 plant revision)Model4,053 checks, 0 failures, 126 / 126 pipe runs; 22 new HP-01 connections natively connected. Proposed revision — PROVISIONAL design. | Native tool output | Autodesk Revit on APS Design Automation 20262026-10-22 | PASS | validated | wf1-NATIVE-REVIT-APS-MEP-20261022-d427192e-REVIEWsha256 62088ee1b7c9… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Native Revit GAs regenerated for P08Drawings93 / 93 checks; visual review 5 PASS / 1 PARTIAL (dense labels on M-5301). | Native tool output | Autodesk Revit on APS Design Automation 20262026-10-22 | PARTIAL | validated | wf1-NATIVE-REVIT-APS-GA-20261022-14eb2f88-SHEETS-r2sha256 079834b3801a… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Plant connection designConnectionsEvery component and connection classified: 4 VERIFIED / 27 PROVISIONAL / 9 BLOCKED. | Hexanta offline | Hexanta engine2026-10-22 | PARTIAL | validated | wf1-PLANT-CONNECTION-DESIGN-20261022-r6sha256 72c25bf5b07b… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Proposed revision schedules and illustrative BOQSchedules / BOQModel, schedule and BOQ reconciled (missing 10 → 0); addendum £3,615.09 ILLUSTRATIVE; Run 3 → Run 4 BOQ £302,308.23 → £350,723.18 ILLUSTRATIVE. | Hexanta offline | Hexanta engine2026-10-22 | PASS | validated | wf1-PROPOSED-REVISION-PACKAGE-20261022-r3sha256 c1f55aff6fcc… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Proposed plant drawings (HP-01 compound, primary schematics)DrawingsM-5304, M-5215, M-5216, M-5614, M-5952: quality gate 5 / 5 (DXF + PDF, not native DWG). | Hexanta offline | Hexanta drawing engine2026-10-22 | PASS | validated | wf1-PROPOSED-PLANT-DRAWINGS-20261022sha256 a83c013aa874… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Pump and fan pressure lossesCalculationsLower bounds only (CHW 82.8 kPa, LTHW 40.2 kPa); fitting / plant losses and pump curves NOT HELD. | Hexanta offline | Hexanta engine2026-10-22 | BLOCKED | blocked | wf1-PLANT-CONNECTION-CALCS-20261022 | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Native AutoCAD DWG of the offline P08 sheetsDrawingsNo APS work item requested; DXF + PDF delivered. | Prepared only | Not recorded | NOT TESTED | exploratory | (no work item) | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| End-to-end acceptance from the web interfaceApplication27 / 27 browser checks on the frozen review build. | Hexanta offline | Playwright2026-10-22 | PASS | validated | wf1-CLOSURE-E2E-20261022sha256 2f5edc3611c7… | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
| Professional engineering approvalApprovalNo verified engineer identity; checking NOT RECORDED. | Prepared only | Not recorded | BLOCKED | blocked | WF1_CLOSURE_ACCEPTANCE row 8.1 | OUTSTANDING — no verified engineer identity; checking NOT RECORDED |
Evidence folders
| Folder | Date | Purpose | Status | Manifest SHA-256 |
|---|---|---|---|---|
| wf1-NATIVE-IESVE-RUN4-20261019-r3 | 2026-10-19 | Run 4 room loads and plant duties | PASS | c7778f9a2adaf8c5… |
| wf1-STAGE4-WORKBOOKS-FINAL-20261021-r2 | 2026-10-21 | Run 4 calculation and equipment workbooks | PASS | 08ce9ab121637cfd… |
| wf1-NATIVE-REVIT-APS-GA-20261021-fc372ee3-SHEETS | 2026-10-21 | Native Revit Stage 4 GA set P07 | PARTIAL | 5cec23cf6176bc53… |
| wf1-NATIVE-REVIT-APS-MEP-20261022-d427192e-REVIEW | 2026-10-22 | Proposed native MEP model (P08 plant revision) | PASS | 62088ee1b7c90ec0… |
| wf1-NATIVE-REVIT-APS-GA-20261022-14eb2f88-SHEETS-r2 | 2026-10-22 | Native Revit GAs regenerated for P08 | PARTIAL | 079834b3801ab008… |
| wf1-PLANT-CONNECTION-DESIGN-20261022-r6 | 2026-10-22 | Plant connection design | PARTIAL | 72c25bf5b07b1145… |
| wf1-PROPOSED-REVISION-PACKAGE-20261022-r3 | 2026-10-22 | Proposed revision schedules and illustrative BOQ | PASS | c1f55aff6fcc5af3… |
| wf1-PROPOSED-PLANT-DRAWINGS-20261022 | 2026-10-22 | Proposed plant drawings (HP-01 compound, primary schematics) | PASS | a83c013aa874be76… |
| wf1-CLOSURE-E2E-20261022 | 2026-10-22 | End-to-end acceptance from the web interface | PASS | 2f5edc3611c77a5f… |
Engineering findings
- Native IESVE loads drive the calculations, schedules, native Revit model and Stage 4 GAs end to end.
- The proposed HP-01 plant revision (P08) is natively connected in Revit (22 connections) without changing any accepted Run 4 element.
Conclusions
- Workflow 1 ran end to end from native IESVE loads to calculations, schedules, a native Revit MEP model and Stage 4 GAs on Autodesk APS: 117 / 117 automated checks on the P07 GA set (visual review 8 PASS / 2 PARTIAL) and 9,762 calculation formulas with 0 mismatches.
- The proposed HP-01 plant revision (P08) is natively connected in Revit (22 connections, 4,053 checks, 0 failures) without changing any accepted Run 4 element; it remains a PROVISIONAL proposal.
- Pump and fan pressure totals are BLOCKED (lower bounds only), native AutoCAD DWG of the offline P08 sheets is NOT TESTED, and professional engineering approval is BLOCKED: no verified engineer identity, checking NOT RECORDED.
Limitations
- Pump and fan pressure totals are BLOCKED (lower bounds only).
- Condensate / defrost drainage, controls / BMS and electrical supply are BLOCKED or PARTIAL.
- The calculation workbook uses licensed CIBSE Guide C data and is not served.
What this case study does not claim
- No engineering approval, checking or construction issue.
- No architect-issued architecture.
- BOQ figures are illustrative, not a cost plan.
Sanitised derivative of the frozen Workflow 1 evidence (tag wf1-techdemo-freeze-20261022), not evidence · Pack wf1-london-office-r2 (built 2026-10-25); every file is checked against its SHA-256 before it is shown.