Definition
An adiabatic humidification method that forces water at high pressure through stainless-steel nozzles, breaking it into very fine droplets. Neptronic SKH systems produce droplets below 20 µm at 70 bar; used in large-volume applications such as textile, printing, woodworking and greenhouses.
Detailed Explanation
A high-pressure misting system has four main components: (1) a high-pressure pump, (2) water treatment (filtration and RO; for the Neptronic SKH hardness ≤ 50 mg/L CaCO₃, RO mandatory on the 100 kg/h model), (3) a stainless nozzle line with anti-drip nozzles, (4) zone control and humidity/temperature sensors. The Neptronic SKH family produces droplets below 20 µm at an operating pressure of 70 bar; it comes in three models of 20, 50 and 100 kg/h with control of up to 3 zones, for in-duct, in-AHU or free-space use.
Why It Matters
Droplet size is the key success parameter of misting. A droplet's evaporation time grows roughly with the square of its diameter; a droplet ten times larger takes about a hundred times longer to evaporate. Fine droplets evaporate within a short distance; large droplets that reach the floor or duct surfaces before evaporating cause wetting, hygiene problems and sensor errors. Pump pressure, nozzle maintenance and correct water treatment are therefore monitored continuously.
Practical Example
Representative example: in a spinning hall, summer outdoor air is 38 °C / 30% RH (wet bulb ≈ 23.7 °C, x ≈ 12.4 g/kg). With adiabatic humidification the air cools and humidifies along the wet-bulb line; cooled to 28 °C, for example, it reaches x ≈ 16.4 g/kg and ≈ 68% RH (+4 g/kg of moisture, ≈ 10 K of cooling). The required capacity is airflow × 1.2 × Δx and is met with the SKH 20/50/100 kg/h models and zone count; larger loads are split across several systems. Electricity is used only for the pump; the heat of evaporation is drawn from the air.
Engineering Note
Design rules: (1) Nozzle placement 1.5–3.0 m high, vertical parallel lines, 1.0–2.0 m spacing. (2) Forced airflow is required — droplets fall before evaporating in still air; the nozzle array is coordinated with a circulation fan or AHU outlet. (3) Multi-zone control — large halls run 3–8 zones with separate RH setpoints. (4) Water-pressure monitoring — when pressure drops (clogged filter, worn pump) the droplet size grows; PLC alarms with bypass. (5) Anti-drip nozzles — prevent residual drip after shutdown.
NKT Application Link
For this application NKT – Nem Kontrol Teknolojileri supplies the Neptronic SKH high-pressure atomisation system, the Neptronic SKVF evaporative cooler and the Neptronic SKV evaporative humidifier. Unit-selection support is based on space conditions, humidification load and the feed-water analysis; technical service and spare parts are provided. Design and installation of water treatment, as well as engineering design, installation and commissioning, remain within the scope of the facility's designer, contractor and water-treatment specialist.
