Indoor Pool Dehumidification

A permanently evaporating water surface inside a heated building — where the real risk is not comfort but the moisture getting into the structure and destroying it from within.

  • 1,495products across this application
  • 590verified manufacturers
  • 5equipment groups

WhatContinuous evaporation, continuously removed

An indoor pool evaporates water into the hall around the clock. That moisture has to be removed at the rate it is produced, by dehumidification, by ventilation with drier outside air, or by a combination. Pool halls run warm — air temperature is normally held a degree or two above water temperature specifically to slow evaporation.

WhoWho buys it

Hotels and resorts with indoor pools, leisure centres, spa and wellness facilities, school and community pools, and the specialist contractors who design pool environments.

WhyWhy the building is what is at risk

Comfort complaints are the visible symptom; structural damage is the real consequence. Moist air that reaches cold surfaces or penetrates the building fabric condenses inside the structure, and the chlorinated atmosphere makes that condensate aggressive. Corroded fixings, saturated insulation and failed roof structures in pool halls are a well-known and very expensive failure mode — and by the time it is visible the damage has been accumulating for years.

HowControlling moisture and pressure together

Size on the evaporation rate, which follows water temperature, air temperature, humidity and how much the surface is agitated — a leisure pool with features evaporates far more than a still lap pool of the same area. Hold the hall slightly negative relative to adjoining spaces so moist air never migrates into corridors, changing rooms or the hotel beyond. Specify every component in the airstream for a chlorinated atmosphere, including fasteners. And design recovery in: the extract stream is warm and continuous, and pool halls have a large permanent heat demand to feed it back into.

Equipment this application needs

Chilling Equipment Dehumidification plant Chilling Equipment88 Sized on evaporation rate, with the reheat that dehumidification inherently needs. Centrifugal Fans Pool hall air handling Centrifugal Fans813 Corrosion-protected throughout — a chlorinated airstream attacks standard components. Heat Exchangers Heat recovery Heat Exchangers364 Warm continuous extract feeding a large permanent heat demand — recovery is essential, not optional. Heat Pumps Pool water heating Heat Pumps96 Heating the pool itself, often recovering from the dehumidification circuit. Exhaust Fans Purge & changing rooms Exhaust Fans134 Adjacent wet areas need their own extract or they become the condensation problem instead.

What to check before you order

Corrosion Resistant 266
Chlorinated humid air. Extends to fasteners and hangers, not just the main components.
Stainless Steel 2,107
Grade 316 in the pool hall atmosphere; 304 is not sufficient here.
Heat Recovery 94
The single largest lever on running cost in a pool hall.
Variable Speed 129
Evaporation varies with bather load and cover use; fixed-speed over-ventilates and wastes heat.
Low Noise 699
Hotel pool halls sit close to guest areas.

Products for this application

Questions buyers ask

Why is pool air kept warmer than the water?
Because evaporation slows as the air above the water gets warmer and more humid. Holding air temperature a degree or two above water temperature reduces the evaporation rate significantly, which directly reduces the dehumidification load and the energy needed to reheat. Cooler air feels better to a wet bather but costs far more to run.
What happens if pool humidity is not controlled?
The visible result is condensation and discomfort. The expensive result is moisture penetrating the building fabric and condensing inside the structure, where chlorinated condensate corrodes fixings and saturates insulation. Roof structure failures in pool halls are a documented and very costly failure mode, and the damage accumulates invisibly for years.
Should a pool hall be positive or negative pressure?
Slightly negative relative to adjoining spaces, so moist chlorinated air migrates into the hall rather than out of it. A positively pressurised pool hall pushes that air into corridors, changing rooms and — in a hotel — towards guest areas, spreading both the smell and the condensation problem through the building.

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