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Energy Saving for Pools

Background

Public swimming pools consume large quantities of energy. Facility owners/managers spend millions of euros every year to heat their pools. A large portion of this energy is often wasted but can be avoided with correct management. This waste also contributes to the increasing greenhouse effect in our atmosphere. The American Department of Energy’s EERE (Energy Efficiency and Renewable Energy) is a national program that responds to all owner necessities in terms of implementing measures to reduce energy-related costs.

How do pools lose heat?

Pools lose heat in many ways, but evaporation is by far the main cause. So much so that, if compared to other causes, all others can be considered minor culprits of heat loss. The reason why evaporation has such an impact is that it requires vast amounts of energy. On the basis of information supplied by the EERE, you need 0.001163 kW/h of energy to raise one litre of water by 1°, whilst every litre of water at 27° that evaporates wastes 1.218 kWh of energy.

Grafico perdida calore

Indoor Pools

The chart exemplifies the impact of evaporation on the total consumption of energy of a covered pool. Comparing the same phenomenon of an indoor pool to that of an outdoor one, the total evaporation changes, but not it’s percentage. Covered pools are not subject to the same temperature fluctuations that are typical in outdoor pools, even though they are not influenced by wind that helps dissipate heat, but they require ventilation installation to control the internal humidity levels caused by evaporation. Without an adequate ventilation system, the high levels of internal humidity cause numerous problems, including condensation on cold surfaces that irreplaceably damages structural components. The energy necessary to manage an adequate ventilation system is added to the already high costs of normal pool functioning. Furthermore, ventilated air needs to be cooled, which means even higher costs.

Outdoor pools

The degree of evaporation in an outdoor pool varies according to different factors: water temperature, air temperature, humidity and wind speed. The higher the water temperature, wind speed and the lower the humidity will result in a larger amount of evaporation. The temperature fluctuations between day and night also cause a drastic decrease in water temperature.

WHY ISOTHERMAL COVERS?

Because evaporation is the main cause of heat loss in all pools, to reduce this to a minimum it is imperative to cover it. Covering pools with an isothermal cover when it is not in use is the most effective way to reduce heating costs. The numerous installations we have done over the years allows us to guarantee an average annual saving of 35/40% on pool maintenance costs.

 

TYPES OF COVERS

The ten plus years worth of experience matured by Favaretti Srl gives our clients to possibility to chose between countless covering and rolling solutions.

Air bubble isothermal covers:  usually made of polyethylene, they can be transparent or opaque. They are the most cost-effective covers, similar to packing material except that they are made with far greater thicknesses and are resistant to UV, chlorine, etc.

Multi-layered isothermal covers: they are made with a closed cell polyethylene foam. On top with a thick armoured polyethylene raffia, and a thin transparent film on the bottom. They are thicker and sturdier than air bubble covers and have a longer life expectancy. Furthermore they guarantee greater heat retention.

 

WHEN TO USE COVERS

As long as the cover functions the way it should, and you can benefit from the important qualities in terms of energy cost reduction, we recommend to cover your pool throughout the night and when it is not in use (independently of whether it is indoor or outdoor).

 

OTHER BENEFITS

Covers offer a variety of other advantages as well as enormous energy saving:

  • Reduction in the use of electrical energy (dehumidifiers/pumps that can be turned off overnight)
  • A reduction in chemical product necessity by 35-60%
  • A save in water costs, reducing by 30-50% the quantity of necessary oil to restore the pool to its optimal water level
  • Reduction in the time necessary to regulate water temperature (after prolonged pauses)
  • Reduction in cleaning time and cost
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