This is article 70 of the MEPVAULT 2026 MEP knowledge series. The platform now houses 70 in-depth articles, 16 interactive calculators (8 already built + 8 in pipeline), and growing research library. This summary captures the unifying design mindset across all of it.
The MEPVAULT design philosophy
Six principles emerge across all 70 articles:
Principle 1: Codes are the floor, not the ceiling
NBC 2016 + ECBC 2017 + ASHRAE/NFPA define minimum compliance. Real engineering exceeds these by 15-30% to capture credit, future-proof against revisions, and absorb site reality.
Principle 2: Free-cooling first
Every chiller plant should consider waterside + airside economiser before sizing the chiller. Indian climates allow 1,000-4,500 hours/year of free cooling. Energy savings 20-50% per year.
Principle 3: DOAS architecture is the new VAV
For commercial > 5,000 m², DOAS with parallel sensible cooling is the modern default. ERV + DCV + DOAS achieves 30-40% reduction vs all-air VAV.
Principle 4: Calculators with hidden logic
For tools published openly, the calculation methodology stays server-side (PHP), front-end shows only inputs + results. This protects intellectual property + ensures methodology consistency.
Principle 5: Multi-layer commissioning
Construction verification → functional testing → performance validation → bacterial validation (for hospitals). Each layer is non-negotiable.
Principle 6: Pillar + spoke article topology
Cornerstone pillars (NBC Master Guide, ASHRAE 62.1 Implementation, Net-Zero MEP, 2026 Design Checklist) anchor the platform. Spoke articles cross-link to pillars + each other.
The 8 calculators currently built (front-end + back-end split)
All calculators in the MEPVAULT Calc Engine plugin v1.8.0 follow strict architecture: PHP back-end (formulas, tables, design factors all hidden) + JS front-end (form, fetch, render).
1. Lighting Load Calculator — NBC 2016 + IS 3646 + IES + ECBC. CU-RCR sensitivity + LPD compliance.
2. Cable Sizing Calculator — IS 1554 + IS 3961 + IS 7098 derating chain. Voltage drop + waterfall.
3. Plumbing DFU & Pipe Sizer — NBC 2016 + IPC 2018 fixture-unit method. By-fixture breakdown + size sensitivity.
4. Plumbing Demand by Building Type — CPHEEO consumption + diurnal profile + storage + pumps.
5. Firefighting Pipe Sizer — NFPA 13 + IS 15105 density-area + Hazen-Williams iteration.
6. Firefighting Pump Head Calculator — NFPA 20 + IS 12469 TDH calc + 65-100-150 verification.
7. NBC Emergency Ventilation Calculator — Stair pressurization + lobby + basement (volumetric/HRR-based).
8. DG Room Ventilation Calculator — IS 4720 + manufacturer specs + heat balance.
8 more calculators in pipeline (Transformer Vent, ASHRAE VRP, NBC Fire Selector refactor, Duct Sizer refactor, CHW Pipe Sizer refactor, CW Pipe Sizer refactor, U Value refactor, Staircase Pressurization refactor).
The 6 research articles published
Cited academic-format research papers in the MEPVAULT research section:
1. ASHRAE 62.1 VRP vs NBC 2016 Pt 8 — comparative analysis (12 references)
2. PUE Performance of Free-Cooling in Indian Tier-III Data Centres — climate-zone analysis (12 references)
3. Thermal Comfort Compliance with ASHRAE 55 in Indian Mixed-Mode Offices — field-survey synthesis (12 references)
4. Refrigerant Choice in Indian VRF — performance + LCC analysis (12 references)
5. Smoke ASET-RSET in NBC Pt 4 High-Rise Atria — analytical case study (12 references)
6. Cooling Tower Water Modelling in Indian Climate — IS 14661 vs ASHRAE 90.1 (10 references)
What’s included in the 70 articles
By discipline:
- HVAC: 28 articles (chiller plants, DOAS, ERV, DCV, IAQ, free cooling, P-O-V, plate HX, refrigerants, scheduling, acoustic, BMS, geothermal, HR-VRV)
- Plumbing: 9 (DFU, demand, vent, rainwater, soak pit, greywater, pool, hot-water recirc, water hammer)
- Firefighting: 7 (sprinkler hydraulic, pump set, smoke control, smoke vent, clean agent, fire alarm, seismic)
- Electrical: 7 (cable derating, lighting, lighting design, transformer, DG, harmonics, earthing)
- Standards/Compliance: 7 (NBC, ECBC vs ASHRAE, NFPA-India, IS 1893 seismic, ISHRAE, BMS protocols, ISO 50001)
- Sustainability: 5 (LEED v4.1, IGBC v3, GRIHA, BEE 2030, Net-Zero)
- Energy modelling: 3 (HAP-OS, cv(RMSE), Appendix G)
- BIM/CAD: 1 (Revit MEP)
- Pillars + cornerstone: 6 (DOAS pillar, ASHRAE VRP pillar, P-O-V pillar, NBC Master Guide, Net-Zero pillar, 2026 Design Checklist)
Where MEPVAULT is going
Next 14 research articles + remaining 8 calculators + 80+ supporting diagrams + plagiarism-audited release. End-state: comprehensive Indian MEP knowledge platform with interactive tools.
Quick navigation
For new visitors:
1. Start with 2026 MEP Design Checklist (article 50) — 120-item cornerstone
2. Move to NBC 2016 MEP Master Guide (article 48) — code framework
3. Read pillars by discipline based on your interest
4. Use calculators to apply on your project
5. Cite research articles in your design submissions
Quick checklist for the MEPVAULT-aligned design
- [ ] All four NBC parts (4, 8, 9, 11) addressed
- [ ] Code minimum + 15-30% performance margin
- [ ] Free cooling investigated for the climate
- [ ] DOAS architecture for > 5,000 m² commercial
- [ ] DCV with NBC 30% lockout
- [ ] ERV ≥ 70/60 sensible/latent
- [ ] LED + DALI + occupancy sensors
- [ ] R454B refrigerant for new installations
- [ ] PICVs in variable-flow systems
- [ ] BAS BACnet end-to-end
- [ ] Seismic restraint per zone
- [ ] Multi-stage commissioning
- [ ] Sustainability rating target
- [ ] Net-zero pathway evaluated
References: All 70 MEPVAULT articles + 6 research papers + 18+ SVG diagrams + 8 calculators (and 8 more in pipeline). Cross-referenced index: see 00_PROJECT_PLAN.md + 01_TOPIC_MASTER_LIST.xlsx.
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