MEP Design for an IT Park or Office Tower: Floor Loads, Chillers and Metering

MEP design for an IT park or office tower begins with a floor-by-floor load schedule built from occupancy, equipment and cooling demand, and not from a single watts-per-square-foot figure. From it you size transformers, the chiller plant, UPS and DG, then design metering so common areas, landlord plant and each tenant can be billed. The Energy Conservation Building Code sets minimums for most of these choices.

How do you derive design loads for an office or IT floor?

We do not quote a design load per square foot, because the figure depends on the tenant mix, the seat density, how much of the floor is server or lab space and the glass and orientation of the façade. What can be set out is the method that produces the number, and the checks that stop it drifting.

1. Split the floor into load classes. Open workstations, meeting rooms, cabins, pantry and food areas, training rooms, IT and network rooms, and lab or test areas each have different electrical and cooling intensity.
2. Build electrical load from the bottom. Lighting, workstation plug load, small power, tenant UPS, server rooms and HVAC motors, each with a demand factor. Apply diversity at the DB, floor and building level; do not sum nameplates.
3. Build cooling load separately. Envelope and glass gain, people, equipment and ventilation air. Our note on glass façade HVAC load shows why facade choices move the plant size more than the interior does.
4. Add a growth allowance in the backbone, not the branch. Leave spare capacity in risers, bus-ducts and plant rooms rather than oversizing every floor panel.
5. Test two scenarios. The leased-at-design mix, and a heavier mix with a data-heavy tenant. A tower that can only take the first mix will be repriced when the second tenant arrives.

The MEPF cost calculator and our transformer sizing calculator help you check the result against a budget and the transformer ratings.

What does the Energy Conservation Building Code fix for design?

The Bureau of Energy Efficiency's ECBC 2017 (with amendments to 2020) applies to commercial buildings or building complexes with a connected load of 100 kW or more, or a contract demand of 120 kVA or more. It binds where your state has adopted it, and the Ministry of Power's year-end review notes that a newer Energy Conservation and Sustainable Building Code was introduced in 2024 and that states may adopt it, so ask your authority which edition applies. The ECBC 2017 provisions below are concrete design inputs.

How should chiller plant sizing be approached?

Size the plant on the simultaneous peak of the building, not the sum of each floor's peak, and size the number of chillers so the building runs efficiently at part load, since offices spend most hours well below peak. Two or three chillers with variable-speed pumping and a plan for N+1 redundancy are common arrangements; the right count depends on tenant uptime commitments. IT parks with after-hours work or 24-hour tenants need a separate plant or a dedicated chiller for the extended-hours zone, so the whole plant does not run for a few floors. Use our chiller capacity calculator for a first estimate, then check against the façade and occupancy assumptions. For retrofits, see chiller plant VFD retrofits.

How should power, UPS and metering be arranged for CAM billing?

Common-area maintenance billing works when the metering is planned in the design, not installed after a dispute. The ECBC requires meters at building mains able to monitor energy, demand and power factor hourly. For sub-meters it sets tiers: services above 1,000 kVA record demand, energy, power factor and current, voltage and harmonic distortion; services above 65 kVA and up to 1,000 kVA record demand, energy and power factor; smaller services record energy hourly. For buildings with a contract demand of 120 kVA to 250 kVA, HVAC must be separately sub-metered; above 250 kVA, lighting, domestic hot water and plug loads must be separate too. The Code lists data centres as a service to sub-meter in business buildings, and requires that tenant-based buildings give tenants tap-off points for their own sub-meters. Our article on CAM charges and MEP sub-metering explains how these meters tie into billing.

Decide early who owns UPS and DG. A common pattern is landlord DG for life-safety and common services, with tenants buying backup capacity at a metered rate, and tenant-owned UPS inside their floors. That avoids landlords carrying tenant IT risk.

How do green targets and fire rules interact with the design?

Green certification targets change the design inputs: lower lighting power, higher chiller efficiency, rooftop solar, water recycling and metering. Decide the target at concept stage, because tuning for it later means changing plant. The ECBC treats renewable power sources as a sub-metered item, which helps if rooftop solar is on the roof.

Fire rules shape the tower. Under the National Building Code of India 2016, Part 4, a high-rise building is 15 m or above in height, and a business building of 30 m and above needs a qualified Fire Officer with at least three years' experience on the premises. Pressurised staircases and lift lobbies, wet risers and refuge areas follow height. A BIS successor edition has been reported, so confirm which edition the fire authority applies. Our fire fighting systems page covers the system side.

How Secured Engineers helps

Secured Engineers designs HVAC, electrical, plumbing and fire-fighting systems in-house and files Fire NOC, CEIG and DISCOM applications in-house. MEPF and rooftop solar can sit under one contract. We work from offices in Noida (Delhi NCR) and Ludhiana, and have delivered 535+ projects across 18+ states with 89.77% repeat clients.

We offer MEP design consultancy and a technical review of a design already prepared: we check the load schedule, chiller plant, UPS and DG strategy and metering scheme against the ECBC checks above and flag what to change before tender. See our design and approvals service, then send drawings on WhatsApp, call +91 70099 85817 or ask for a free proposal to review your design.