By E E Khalil

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The above values are for unoccupied spaces with all air conditioning. Outdoor noise levels should not exceed the local environmental protection laws less than 60 db (A) at 3 m. 13 Energy efficiency Ee. 14 Air exchange efficiency Ea. 15 Gross efficiency. 16 Circulating air handling units. 17 One hundred percent fresh air handling units. 4 Air Handling Units Air handling units are devices that treat the air and are generally constructed of modular patterns of added sections that yield the main functions of supplying, filtering, cooling, humidification/dehumidification, heating, reheating, extra filtering of the air, etc.

10 High ceiling diffuser flow pattern. 11 Fixed swirl diffusers for ceiling installations. 12 Heat removal efficiency Eh. 15 after Kameel and Khalil,11 with numerical procedures outlined in references 12 to 16. 3 Noise Criteria Noise produced by air grilles and supply outlets contributes to discomfort in the room and should be avoided at all times. To identify the spectrum content on noise, the use of noise criteria (NC) is proposed. Generally levels below NC 30 are considered to be quite; noisy conditions refer to NC greater than 50 to 55.

The manufacturer must provide for curves showing the performance that will be achieved when tested. Similarly, data must be submitted showing the sound power level for all eight octave bands that will be achieved when tested. The fan curves shall clearly show the duty point and absorbed power to ensure stable operating conditions and a minimum margin of 20% between absorbed and motor power. Motors shall be mounted on slide rails for easy belt tensioning, and be totally enclosed and fan cooled with F class insulation.

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