Energy Efficient Cooling
Ventilation systems alone can provide comfort cooling for most of the year in the UK. However, on hotter days they are unable to maintain internal temperatures below 25°C. It is at this point that additional cooling is required. Using evaporative cooling as an integral part of a balanced ventilation system means that the temperature of a building can be controlled even on the very hottest days.
Being a natural process, evaporative cooling is far more energy efficient than refrigeration, requiring no energy input. The only energy used in an evaporative cooling system is for the ventilation system fans and the small internal water pump within the unit.
An evaporative cooling installation typically consumes less than 10% of the electricity of an equivalently rated refrigeration based cooling system. Return on investment for industrial systems is usually between 2-5 years and can be as low as 6 months for environments where the cooling is required 24/7 e.g data centres.
Industrial Systems Savings
An evaporative cooling installation typically consumes less than 10% of the electricity of an
equivalently rated refrigeration-based cooling system. These low running costs mean that the return on investment for industrial systems is usually between 2-5 years and can be as low as 6 months for environments such as data centres where cooling is required 24/7.
The average hourly cost for a single small EcoCooler is just £0.18. If this unit was fitted into a normal factory will be double shift from 6am to 10pm, the annual running costs would be:
|Running Costs (Annually)*||Unit||Cost|
To put the running cost into perspective, the comparative air conditioning cassettes would cost around £2,500 a year to run.**
The environmental impact is also much lower than air conditioning, with the CO2 emissions for a single cooler being 1.4 tonnes compared to an equivalent refrigeration system which is 10 tonnes.
Data Centre Systems Savings
EcoCooling developed a calculator to estimate the possible energy savings for all of our systems, inputs include historical weather data and fan data. Cost analysis can be performed for any size data centre or telecoms room in most locations worldwide. Please contact email@example.com for more information for your location.
Example EcoCooling Energy Savings Report
PUE (Power Utilisation Effectiveness)
CREC® systems have assisted both new build and retrofit data centres to achieve PUEs of below 1.1. The fans that drive air flow are the most significant energy consumer in the system, and the use of efficient electronically commutated motors is instrumental in minimising energy use. Exploiting EC fan technology can reduce the power required further, meaning PUEs of 1.05 are now achievable in optimum environments. See our data centre case studies page for more information.
Safety – Legionnaires Disease
Legionnaires’ disease is a form of pneumonia. It is contracted by breathing in very small droplets of water contaminated by Legionella bacteria. It is estimated that there are over 40 million evaporative coolers world-wide and there has never been a case of Legionnaires’ disease attributed to a wetted media evaporative cooler. UK legislation regarding Legionnaires’ disease is contained in an HSC guide called Approved Code of Practice (ACOP) Legionnaires’ Disease: The control of legionella bacteria in water systems L8.
The key reasons why an EcoCooling evaporative cooler is safe are:
- Avoidance of stagnant water
- The coolers automatically drain when not in use
- Low water operating temperature
- The temperature of the water rarely goes above 200C
- Avoidance of corrosion and scaling
- There is a water management system which prevents scale
- No production of aerosols
- The air velocity over the pads is too slow to create carry over
- The units are maintained by qualified personnel
EcoCooling produces a range of fact sheets and a complete Legionella control manual which exceeds the requirements of this legislation.
*Based on service costs of £0.12 p/kWhr and £1.200/CuM
** Costs calculated using the Carbon Trust running costs calculator