Site Overview · Module 2
Somerset Greenways, Chennai
Ascott / CapitaLand serviced-residence · 900 TR chilled-water cooling plant delivered by Cleteco under a BASE / SET Alliance Cooling-as-a-Service contract. Zero capex for the client; provider carries the electricity bill and installs the most efficient equipment. Verified against IPMVP and ASHRAE Guideline 14.
Role · Cleteco Analyst
IPMVP Option BASHRAE 211 · Level 3BASE CaaS
Verified savings — this month
8.0%
Significance PASS · IPMVP 2·SE
Adjusted baseline routed to reporting-period OAT + occupancy.
HVAC annual baseline
₹64.20 L
/ yr
Somerset-only · FY 24-25
Fixed grid demand charge
₹67.00 L
/ yr
≈ 1/3 of total energy spend
Plant capacity
900
TR
3 × chillers · 1×YMC² · 1×YVAA · 1×Carrier
Settlement tariff
₹5.60
/ TR-hr
vs Ascott ₹6.49 · client saves 13.7%
Trailing 12 months · Reporting vs adjusted baseline
Verified energy trajectory
Adjusted baseline (kWh) Reporting-period actualCurrent month = Mar 25
Chilled-water plant
Equipment & schematic
York · YMC² Magnetic-Bearing Centrifugal
0.57 kW/TR300 TR
Lead chiller — most efficient. Prioritise in sequencing.
York · YVAA Screw Chiller
0.64 kW/TR300 TR
Second-in-sequence.
Carrier · 19DV Legacy Centrifugal
0.68 kW/TR300 TR
Legacy asset — replacement candidate.
Grundfos · TP-Series
7.5 kW × 3 nos.
Constant flow — convert to variable primary flow (VPF).
Grundfos · TPE-Series
18.5 kW × 3 nos.
Marley · NC Series
3 cells
VFDs present but fixed at 45 Hz — never modulated.
No BTU meter installed
Drives measurement uncertainty on TR-hr billing. See Opportunities → BTU meter.
Real-time monitoring
Operational alerts
Low ΔT syndrome
HIGHChilled-water return-supply ΔT observed at ~1.9 °C vs design 5–6 °C. Secondary pumps overrun to compensate; plant kW/TR degrades.
Rolling 72 h — 61% of hours in violation·Ref: ASHRAE Std 180 §5 · Std 211 L3 finding
Cooling-tower VFD flatline @ 45 Hz
MEDIUMCT-1/CT-2 fan-speed telemetry pinned at 45.0 Hz across all wet-bulb conditions. Modulation loop appears disabled.
Last 30 days — 100% flat·Ref: ASHRAE Std 180 §6
Keycard-bypass load spike
MEDIUMRoom 412 shows 1.2 kW baseline draw with keycard removed >8 h — indicates FCU/fridge not isolated by keycard controller.
48 rooms flagged this month·Ref: ASHRAE Std 180 §6.4
Verification status
This month
Verified savings8.0%
G14 hourly · CV(RMSE) ≤ 30%✓ PASS
G14 hourly · |NMBE| ≤ 10%✓ PASS
IPMVP · savings > 2·SE✓ PASS
Statistical significance ratio 0.97× — savings are 0.97× the 2·SE threshold; annual fractional uncertainty 51.7% vs G14 cap 50%.
Open Calculation Engine