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70-71 CONDENSATION:SPN Master pages 13/9/08 00:58 Page 2
spnfeature
CONQUERING
CONDENSATION!
IntheUK,indoorswimmingpoolsarenowpopular–allyearround.Oneof
thebiggestconcernshoweverofalargerpoolcomesfromcondensation
whenaswimmingpoolbecomeslikeabathtub–butonamuchlarger
scale!PaulScott,TechnicalDirectorofHeatstarlooksatwhatisan
unpleasant,costly,difficultandeverpresentproblemforpoolowners
I
n a typical indoor pool, water is heated in the fresh air than in the humid pool contained within the humid pool room air
to a temperature between 28°C and room air. It is a misconception that fresh air back to either the air or pool water.
30°C. The heated water results in contains more moisture in the winter Dehumidification by refrigeration is not
steam from the pool water being months – the reality is that, in the UK, the a new technology. The American inventor
evaporated and is transferring into the air fresh air in the summer months actually Willis Carrier is attributed to have
within the room. contains much more moisture, needing designed the first modern air conditioning
The result is condensation! increased air extraction rates during such system in 1901. However, what he actually
Unregulated, this evaporating and times. The fresh air during the winter designed was a dehumidifier, specifically to
transferring of water into the pool room air months may seem ‘damp’, but this is enable printing inks to dry properly during
continues, so the air becomes over loaded merely the ‘relative humidity’ effect at a humid weather. The cooled air effect we
with water, resulting in water condensing cold air temperature. associate with modern air conditioning was
on the windows, walls and ceiling, To achieve humidity control through merely a by-product of the function of the
deteriorating the decor and possibly fresh air could necessitate throwing away dehumidifier.
structural failure. the entire air volume of the pool hall to The application of this technology into
Ideally, to limit heat loss and evaporation atmosphere once every 10 minutes. swimming pools was not really evident
from the pool water surface, the pool room Bearing in mind the requirement to heat until the 1970’s, when the cost of energy
temperature should be maintained slightly the introduced fresh air to maintain the came into focus.
higher than that of the pool water. I.e. if required pool room air temperature, the Today the swimming pool
the pool water temperature is 28°C, the energy consumed by such a process will dehumidification products available range
pool room air temperature should be be huge. from simple small dehumidifiers which are
maintained at 30°C. Given high fuel costs, such a wasteful mounted on the wall in the pool room to
approach is prohibitively expensive to advanced full climate control systems
How is the amount of moisture in operate and would now be in breach of which are located in the plant room and
the pool room air controlled? building control regulations. distribute air around the pool hall via a
The basic requirement is to remove Modern systems now use methods of central ventilation duct work system.
moisture from the pool room air at a rate active energy recovery, using refrigeration As well as humidity control and active
greater than water is evaporating from the technology to condense out excess heat recovery, these sophisticated systems
pool surface. humidity without the need to ‘throw away’ can now provide air heating, ventilation, air
Humidity control with fresh air is the warm pool air at all. Such systems also cooling, pool water heating and even now
possible as there is less moisture content have the ability to ‘recycle’ the latent heat generate their own heat.
70 swimming pool news OCTOBER 08
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Digital edition available at www.swimmingpoolnews.co.uk
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