Air Cooling Processes

The chart below compares evaporative cooling with other air-cooling processes, based on a 20m x 20m factory space. For further details or your FREE on-site 'proof of concept' demonstration, please contact us here.

	Permanently Installed Evaporative Cooling	Air Conditioning	Forced Ventilation	Hired Mobile Evaporative Coolers
Energy Costs (hot summer day)	£0.14 per hour	£0.81 per hour	£0.10 per hour	£0.14 per hour, plus ventilation costs
Energy Costs (average summer day)	£0.11 per hour	£0.49 per hour	£0.10 per hour	£0.11 per hour, plus ventilation costs
Carbon Emissions	1.5 tonnes per year	12 tonnes per year	1.5 tonnes per year	1.5 tonnes per year
Installation Cost	£6,000.00	£18,000.00	£4,500.00	£2,500.00 every year, plus forced ventilation costs to make it work
Average Temperature Drop Inside the Room	8 deg C at design conditions, more as it gets hotter outside	8 deg C at design conditions, less as it gets hotter outside	Reduces temperature to a few degrees above outside temperature in ideal conditions, never better	8 deg C if placed in a doorway with extract, typically zero or even a temperature increase if placed close to the work area
Air Distribution	Can be the whole room or just problem areas	Whole room. Cold spots can develop close to outlets	Can be the whole room or just problem areas	Very poor –is unlikely to deliver any cooling to the problem area, if placed near a door as required
Effect of Increasing Outside Temperature	More cooling with no limit	Less cooling, and then complete failure	Still very little temperature reduction. Often turned off in the afternoons to stop it blowing hot air over people and processes	More cooling ONLY if placed outside, otherwise zero cooling
Fresh Air	100% filtered fresh air	Recirculated stale air. Fresh air should always be introduced, increasing installation costs and reducing performance	100% fresh air. Can be filtered at extra cost	Needs fresh air to work, but there is rarely enough available where the cooling is needed
Operating Conditions	Doors and windows can be left open. Through traffic has no effect	Doors and windows must be closed to create an enclosed environment	Doors and windows can be left open	Must be placed close to a source of 100% fresh air
Effect on Humidity	Neutral when properly designed. Can be used to humidify if required without losing the cooling effect	Reduces humidity at the expense of cooling effect	Unpredictable, but never better than ambient	Rapidly humidify the room and stop cooling altogether
Environmental Impact	Low carbon emissions. Low energy use. Zero CFC/HCFC usage. Plain water to drain	High carbon emissions. Requires CFC/HCFC management and possibly monitoring. Compressor contains oil requiring specialist disposal	Very high carbon emissions and energy usage per deg C temperature reduction	Low carbon emissions, but in most applications energy is used for little or no benefit