A nd what does this cause? Draught. To prevent this onslaught of cold air, it is critical to choose sophisticated air systems that mix cool and hot air so deftly that a draught cannot be created. With these systems, a smooth and seamless airflow is the guarantee as you have invested in a solution which incorporates the best design p ractices in the industry. When you make a cake, would you use a fork or a whisk? Which is more efficient, and which one creates a more moreish cake that everyone wants to eat?

Induction rate Induction rate

So what is the key component of sophisticated air systems? The key element to equal air distribution is a high induction rate. High i nduction rate is the ratio between how many l itres of air are supplied to how many stagnant l itres of air are mixed. With the assistance of an analogy, induction rate can be understood in easier terms. Imagine you’re stepping into a bath and the water is too hot. To cool down, you turn on the cold tap, which is only cooling one area of the water. Because your body cannot stand the hot temperature you add even more cold w ater, scorching your hand as you mix the two temperatures together.

T his frustrating attempt to reach the

a mbient temperature is hardly efficient. With a higher induction ratio, cool and warm air is mixed effectively, ensuring optimum ambient temperatures are reached in the quickest fashion possible. A high induction ratio creates low- v elocity and highly mixed fresh air in occupied z ones, eliminating draught and ensuring complete comfort for a building’s inhabitants.

T his critical, higher induction ratio means running costs are kept to a minimum, and less energy is used to pump air out from an outdated and inefficient system. Returning to t he bathwater analogy once more, high induction r atio ensures the perfect bathing temperature with minimal water waste.

Labs and industrial spaces

Movement in labs and industrial sites often r equires a different kind of air distribution. In l aboratories, draught-free ventilation is critical, as contaminant particles should not spread to an occupied zone. Unlike the unfavourable turbulent flow mentioned above, laminar flow a ir distribution is often required. In laboratory conditions, people must be washed with air in o rder to ensure complete safety and comfort,

while also extracting contaminant particles in the process.

Conversely, industrial or nuclear sites

require intense filtration of harmful particles. Sophisticated air distribution systems will not o nly entrain these particles, they also filter all contaminants out of the air securely. All that is left to do is to clean filters regularly in order to keep systems contaminant-free and fit for huma n safety.

Moving and controlling air is an unknown a rt which need not be complex to understand. F undamentally, air distribution systems should be designed and installed to guarantee human safety and comfort.

There is an art to achieving this. When selecting a diffuser in the future, specify the maximum velocities, temperature differences a nd noise criteria allowable in an occupied zone. Also ask what the induction rate of the diffuser is, as this will enable you to picture the system’s sophistication.

Next time you feel a draught in a public space, you might know why and where it is coming from – and you could be more enlightened as to whether or not an efficient air conditioning system is in place.

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Certificate No. EMS 569454 BS EN 1SO 14001 : 2015

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