Question

With reference to Air conditioning systems onboard for accommodation spaces:

(a) Sketch and explain a fully automated air conditioning system, annotating the relevant temperatures and relative humidity throughout the system. (12)

(b) Explain how bacteria are prevented from growing in an air conditioning system to a dangerous degree. (4)

Answer 1

(a) (b)

The bacteria flourish in stagnant water or sludge or where wet matrix material may become encrusted with scale, dirt or organic matter such as dead insects. Main danger areas are inlet arrangement, filters, cooler units, humidifiers and plenum insulation. The risk of dangerous bacteria forming can be minimised by he following steps below:

Eliminate spray
Keep insulation dry
Ensure drains dept clear
Inspect change and clean filters regularly
Wash/clean danger areas with super chlorinated solution of 50ppm

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