Fundamental difference?

Central: AHU production + duct distribution. Local: per-room unit + sensor. Architecture follows zone profile, not just CAPEX-OPEX.

Central applications?

Homogeneous RH demand: office, mall, hotel, hospital corridor, large commercial. Single-point water treatment + BMS + scale economy.

RH band spread >10%, cGMP hygienic, fast-response process cabinets, large open volumes (textile hangar, warehouse, parking), heterogeneous-zone buildings.

Central coarse control of shared band + local trim fine-tuning. Large museums, multi-cGMP pharma, hospitals, data centres. Combines scale + zone flexibility.

Single-point failure?

Central: single failure affects all zones → critical sites use N+1 redundancy or two parallel lines. Local: structurally absent; failure confined to room.

Sensor architecture impact?

Central: in return duct past absorption distance. Local: in space at point of consistent airflow. Prevent PID oscillation.

Pure central works to average; trim units/VAV/post-heat fine-tune. Large spread (>10%) needs hybrid or local evaluation.

Long duct network condenses part of transported steam on walls, energy + hygiene risk. Drain + insulation + absorption distance limit it. Absent in local.

Central: low CAPEX + redundancy cost + duct condensate loss. Local: equipment multiplication + maintenance workload + distributed water treatment. NKT presents both TCO models.

NKT product recommendation?

Central: SKD steam distribution manifolds (Multi-Steam). Local: SKVF standalone evaporative cooler/humidifier + SKV in-room humidifiers. SKH configurable for both.

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Central or Local Humidification? Architecture Decision Guide

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Related Glossary Terms

For deeper definitions of the technical concepts in this article, browse the related entries in the NKT Glossary:

Relative Humidity (RH)Absolute Humidity Dew Point Cleanroom Modbus (RTU/TCP)BMS (Building Management System)Calibration HVAC (Heating, Ventilation & Air Conditioning)GMP (Good Manufacturing Practice)CAPEX (Capital Expenditure)TCO (Total Cost of Ownership)ACH (Air Changes per Hour)PID Control (Proportional-Integral-Derivative)Setpoint (Target Value / Set Point)High-Pressure Atomization Steam Humidification Adiabatic Humidification Sorption (Adsorption + Absorption)Maturation Reverse Osmosis (RO/DI) Water Outdoor / Fresh Air Humidification Capacity (kg/h)Steam Distribution Manifold Absorption Distance Humidity Sensor Placement Condensate (Steam Condensation)Duct Velocity Steam Distribution Rack (Multi-Pipe Manifold)Evaporative Humidification Nozzle (Atomisation Orifice)Droplet Size Evaporative Cooling (Adiabatic Cooling)Humidity Sensor High-Limit Humidity Sensor Modulation (Capacity Modulation)Water Treatment

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