Induction unit

Primary air induction system Air introduced via an air duct to the induction unit, generally in the form of treated outdoor air. 

Example 28.4 Primary air and chilled water Eor the same application, primary air reaches induction units at the rate of 0.4 kg/s and at conditions of 13°C dry hulh and 72% saturation. Chilled water enters the coils at 12°C and leaves at 16°C. What will he the room condition and how much water will he used ... 

The second method makes use of the pressure energy of the primary (fresh) air supply to induce room (secondary) air circulation. This air, at a pressure of 150-500 Pa, is released through nozzles within the coil assembly, and the resulting outlet velocity of 16-30 m/s entrains or induces room air to give a total circulation four or five times as much as the primary supply. This extra air passes over the chilled water coil. Most induction units are wall mounted for perimeter cooling, but they have been adapted for ceiling mounting. 

With induction units, latent heat extraction can usually he handled hy the primary air and they run with dry coils. Some systems have heen installed having high latent loads which remove condensate at the coil. 

In climates which have a well-defined summer and winter, heating when required can he obtained with fan coil or induction units, hy supplying warm water to the coil instead of cold. Some variation of this is possible with induction systems which can, at times, have cold primary air with warm water, or vice versa, giving a degree of heatingcooling selection. 

Fig. 13. Normalized Gaussian (G) lineshape (l/cr /n) exp(-5/

B-held Also called flux density or magnetic induction. Units of B are tesla (T) or webers per square meter (Wb/m2). 

B Magnetic induction. Unit T (Wb/m ). A magnetic induction 1 T generates a force of 1 N/m on a conductor carrying a current of 1 A, perpendicular to the direction of induction. 

By a similar approach, it can be shown (Plonus, 1978 Cheng, 1993) that the inductance/unit length of a coaxial cable (Fig. 2.33(a)) is... 

Finally, the growth of ultra-high-frequency, large-scale integrated circuitry places ever-increasing importance on parallel strip Hnes of the type shown in Fig. 2.34(a) and Fig. 2.34(b). It is a rather simple matter (Plonus, 1978) to show that the inductance/unit length for both of these structures is... 

Generally, there are three types of instruments used to detect ordnance cesium vapor magnetometers, radio telemetry (common metal detectors), and pulse induction units. For many years, none could reliably distinguish between metal debris and ordnance items. Even size is difficult to tell because the signal is faint on a smaller, closer object and faint on a larger, deeper object. 

Magnetic field induction unit—tesla (T) (maximal magnetic force moment, acting on a unit magnetic moment)... 

Inductance unit—henry (H) (inductance of a conductor in which at a current of 1 A appears a total magnetic leakage of 1 Wb)... 

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