VRF

Research

Indian VRF Refrigerant Transition — R-22 to R-410A to R-32 to R-454B
This article presents a comparative performance and lifecycle-cost analysis of three low-GWP refrigerants — R32, R454B, and R-1234yf — applied to Indian Variable Refrigerant Flow (VRF) systems. A 100-ton VRF reference system is analyzed for capacity, IEER (Integrated Energy Effic… Read more →

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This article presents a comparative performance and lifecycle-cost analysis of three low-GWP refrigerants — R32, R454B, and R-1234yf — applied to Indian Variable Refrigerant Flow (VRF) systems. A 100-ton VRF reference system is analyzed for capacity, IEER (Integrated Energy Effic…

HVAC

VRF Retrofit Case Study: Replacing 30-Year Ductable Splits at Delhi Corporate HQ
A 1995-built corporate headquarters in central Delhi ran ductable splits on every floor for three decades. By 2024 the indoor units were unobtainable for spare parts, refrigerant R-22 had crossed BEE Read more →

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A 1995-built corporate headquarters in central Delhi ran ductable splits on every floor for three decades. By 2024 the indoor units were unobtainable for spare parts, refrigerant R-22 had crossed BEE

HVAC

VRF Refrigerant Pipe Sizing: Suction, Discharge, and Liquid Line Rules
VRF refrigerant piping is one of the few MEP disciplines where the OEM (Daikin, Mitsubishi Electric, Mitsubishi Heavy, Hitachi, LG, Toshiba) effectively dictates the design. Brand-specific tables driv Read more →

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VRF refrigerant piping is one of the few MEP disciplines where the OEM (Daikin, Mitsubishi Electric, Mitsubishi Heavy, Hitachi, LG, Toshiba) effectively dictates the design. Brand-specific tables driv

HVAC

VRV Heat Recovery in Mixed-Mode Indian Offices: When Simultaneous Heating + Cooling Pays Back
A heat-recovery VRV system can simultaneously cool one zone while heating another, with the heat from the cooling zone "recovered" and used for the heating. Sounds great in theory; in practice it pays Read more →

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A heat-recovery VRV system can simultaneously cool one zone while heating another, with the heat from the cooling zone “recovered” and used for the heating. Sounds great in theory; in practice it pays

HVAC

VRF Refrigerant Piping Limits: Daikin, Mitsubishi, LG, Hitachi — What 2026 Designers Need to Know
A VRF system is only as flexible as its refrigerant piping. Each major manufacturer specifies different maximum total piping length, maximum vertical separation, maximum branch length, and maximum hei Read more →

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A VRF system is only as flexible as its refrigerant piping. Each major manufacturer specifies different maximum total piping length, maximum vertical separation, maximum branch length, and maximum hei

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