India

Research

Latent Load Underestimation in Indian Commercial: Psychrometric Mismatch Between Design and Operation Across 9 Buildings
Field-measured psychrometric performance was studied across 9 Indian commercial buildings over 24 months. Design vs operation comparison reveals systematic latent load under-estimation: design SHR 0.78-0.85 vs measured 0.62-0.75, a 12-18% absolute deviation. Indian-tropical OA at… Read more →

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Field-measured psychrometric performance was studied across 9 Indian commercial buildings over 24 months. Design vs operation comparison reveals systematic latent load under-estimation: design SHR 0.78-0.85 vs measured 0.62-0.75, a 12-18% absolute deviation. Indian-tropical OA at…

Research

Rainwater Harvesting Yield Across 8 Indian Climate Zones — IS 15797 + CGWB + IMD
Field measurement of rainwater harvesting yield was conducted at 8 Indian sites spanning Hot-Dry, Warm-Humid, Composite, Temperate, and Cold climate zones over 60 months. Measured annual yield ranged from 280 L/m² (Jodhpur) to 2,640 L/m² (Cochin). Runoff coefficient for RCC roof:… Read more →

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Field measurement of rainwater harvesting yield was conducted at 8 Indian sites spanning Hot-Dry, Warm-Humid, Composite, Temperate, and Cold climate zones over 60 months. Measured annual yield ranged from 280 L/m² (Jodhpur) to 2,640 L/m² (Cochin). Runoff coefficient for RCC roof:…

Research

Hot Water Demand for Indian Hospitality & Healthcare — IS 13412 vs ASHRAE vs ASPE
Field measurement of hot water demand was performed across 14 Indian 5-star hotel properties (Pune, Mumbai, Bengaluru, Hyderabad, Goa) over 36 months. Per-guest daily demand at 60°C: 175-225 L (mean 200 L), exceeding ASPE Hunter Type 2 (140 L) by 43%. Peak-hour fraction: 0.28-0.3… Read more →

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Field measurement of hot water demand was performed across 14 Indian 5-star hotel properties (Pune, Mumbai, Bengaluru, Hyderabad, Goa) over 36 months. Per-guest daily demand at 60°C: 175-225 L (mean 200 L), exceeding ASPE Hunter Type 2 (140 L) by 43%. Peak-hour fraction: 0.28-0.3…

Research

Indian LED Maintenance Factor: 5-Year Lumen Depreciation Field Study Across 18 Commercial Sites
Field measurement of lumen output decay across 18 Indian commercial sites (offices, retail, hospitality) over 60 months. LED panels installed 2019-2020 measured at install + 12 + 24 + 36 + 48 + 60 months using calibrated lux meters. Mean output retention at 60 months: 84-87 % acr… Read more →

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Field measurement of lumen output decay across 18 Indian commercial sites (offices, retail, hospitality) over 60 months. LED panels installed 2019-2020 measured at install + 12 + 24 + 36 + 48 + 60 months using calibrated lux meters. Mean output retention at 60 months: 84-87 % acr…

Research

IAQ vs Energy Pareto Frontier in Indian Commercial Buildings: A Multi-Objective Optimization Framework
This article presents a multi-objective optimization framework mapping the Pareto frontier between IAQ + energy consumption for Indian commercial buildings. Eight design variables (OA rate, ERV effectiveness, MERV filter rating, DCV setpoint, building envelope U-value, lighting L… Read more →

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This article presents a multi-objective optimization framework mapping the Pareto frontier between IAQ + energy consumption for Indian commercial buildings. Eight design variables (OA rate, ERV effectiveness, MERV filter rating, DCV setpoint, building envelope U-value, lighting L…

Research

Cooling Load Method Validation: CLTD vs RTS vs HBM Across 12 Indian Commercial Buildings
Three ASHRAE-codified cooling load methods (CLTD/CLF/SCL, RTS, and Heat Balance Method) were applied to 12 Indian commercial buildings (4 office, 4 hospitality, 4 retail) with measured post-occupancy peak chiller loads. CLTD method over-estimates by 8-16%, RTS over-estimates by 3… Read more →

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Three ASHRAE-codified cooling load methods (CLTD/CLF/SCL, RTS, and Heat Balance Method) were applied to 12 Indian commercial buildings (4 office, 4 hospitality, 4 retail) with measured post-occupancy peak chiller loads. CLTD method over-estimates by 8-16%, RTS over-estimates by 3…

Research

Cable Derating in Saturated Clay: Field-Measured Performance vs IS 3961 Predictions Across 5 Indian Sites
This article reports field measurement of cable temperature + ampacity at 5 Indian sites with saturated clay (Konkan basalt, Mumbai laterite, Goa marshland, Kerala coastal, Bengal delta). IS 3961 derating predictions compared against measured. Results: IS 3961 at C=120, ρ=2.5 K·m… Read more →

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This article reports field measurement of cable temperature + ampacity at 5 Indian sites with saturated clay (Konkan basalt, Mumbai laterite, Goa marshland, Kerala coastal, Bengal delta). IS 3961 derating predictions compared against measured. Results: IS 3961 at C=120, ρ=2.5 K·m…

Research

HAP vs OpenStudio Empirical Agreement: Comparing Annual Energy Predictions Against 12-Month Measured Data on 6 Indian Buildings
This article compares HAP and OpenStudio + EnergyPlus annual energy predictions against measured 12-month data from 6 Indian commercial buildings. Without calibration, both tools deviate 8-22% from measured. After calibration (per ASHRAE G14), HAP achieves 7-12% deviation; OpenSt… Read more →

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This article compares HAP and OpenStudio + EnergyPlus annual energy predictions against measured 12-month data from 6 Indian commercial buildings. Without calibration, both tools deviate 8-22% from measured. After calibration (per ASHRAE G14), HAP achieves 7-12% deviation; OpenSt…

Research

Embodied Carbon in MEP Equipment: A Framework for Indian Net-Zero Building Accounting
This article presents a framework for quantifying embodied carbon in MEP equipment for Indian commercial buildings, applied to a representative 5,000 m² office. MEP embodied carbon = 235-350 tCO₂e (chillers + AHUs + pumps + electrical + plumbing) at construction, amortized over 5… Read more →

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This article presents a framework for quantifying embodied carbon in MEP equipment for Indian commercial buildings, applied to a representative 5,000 m² office. MEP embodied carbon = 235-350 tCO₂e (chillers + AHUs + pumps + electrical + plumbing) at construction, amortized over 5…

Research

Cleanroom Recovery Time vs Air Changes: Field Validation Across 5 Indian Pharmaceutical Facilities
This article reports cleanroom recovery time field validation across 5 Indian pharmaceutical facilities (Grade B + C cleanrooms; ISO 7-8 equivalent). Recovery time at standard 25 ACH = 9-12 minutes; at 40 ACH = 5-7 minutes; at 60 ACH = 3-5 minutes. Findings show ACH increase from… Read more →

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This article reports cleanroom recovery time field validation across 5 Indian pharmaceutical facilities (Grade B + C cleanrooms; ISO 7-8 equivalent). Recovery time at standard 25 ACH = 9-12 minutes; at 40 ACH = 5-7 minutes; at 60 ACH = 3-5 minutes. Findings show ACH increase from…

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