Sharp JX-9400 Informacje Techniczne Pobierz pdf (Strona 186)

From which, using the method described in Chapter 1, ‘Zone by zone

systems of equations’, we get the airﬂow rates to and from each zone [m

/h]

shown in Table 7.8.

Let us suppose that the error on the injection rate is 5 per cent and if the

relative error on the concentration is 2 per cent. What is the probable error

on the airﬂows? Using the most simple method, we get a relative error of 9

per cent.

Using the spectral norm, we get relative errors of 12 per cent for zone 1 and

7 per cent for zone 2. These are upper limits that are easily calculated, but there

is more information than the simple method allows, since we can see the diﬀer-

ence in quality of the measurements between the two zones.

Notes

1 The wavelength,  and the frequency, f, of an electromagnetic wave such as light,

infrared or radio waves are related by f ¼ c, where c is the velocity of light

(3  10

m/s).

2 Halogenated compounds are compounds containing ﬂuorine, chlorine bromine and

iodine in their molecule.

Table 7.8 Airﬂow rates [m

/h], calculated from the data given in Table 7.7

Flow going to Outdoors Zone 1 Zone 2

Flow coming from

Outdoors – 11.0 32.6

Zone 1 21.4 – 9.7

Zone 2 22.2 20.1 –

Common Methods and Techniques 165

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Sharp JX-9400 Informacje Techniczne Strona 186