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<h3>
Noise calculation
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<p>Noise calculation can be performed in two modes:<br><br>
<b>1. </b>As a separate (general) calculation.<br>
<b>2. </b>As part of the valve calculation and design. The parameters of the medium and valve will be transferred from the window for the valve calculation and design (1, 2).
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<b>Noise calculation as a separate (general) calculation</b>
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The calculation window is opened by clicking on Calculation-> Noise (3) in the main menu. As in this mode the noise calculation is not bound to any valve calculation and design, the user shall fill in all input data. For more information, see below.
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<p>
<b>Noise calculation as part of the designed valve</b>
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First, perform the valve calculation (1), then prepare the design(2), and finally calculate the noise the input window of which opens after pressing the button (4) in the valve calculation or design window. This noise calculation becomes part of the designed valve, which consists of three parts - valve calculation, valve design and noise calculation. (It is also possible to calculate the noise even without previous valve calculation (1) or design (2). The missing input data must be entered manually.)
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<p>
After closing the window for noise calculation, it can be opened again using the button (4) in the valve calculation or design window, or if the valve is part of the project, you can click on an item in the project window (5) and choose View -> Noise ( 6) in the menu. Both the entered and calculated values remain in the re-opened noise calculation window.
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<p>
If you make any changes in the input data for the noise calculation transferred automatically from the valve calculation and design, these changes will be preserved. Use button (7) to reload input data.
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<p><i>
The button (7) is used to reload the input data for the noise calculation from the valve calculation and design windows; this data is completed automatically only when you open the noise calculation window for the first time.
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Because the amount of the input data for the noise calculation is large, it is divided into several screens among which you can move by using the <b>Previous</b> and <b>Next</b> (8) buttons at the bottom of the window.
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<b>1. </b>Types of media and valves.<br>
<b>2. </b>Medium parameters. The physical properties at the bottom of the screen will be entered automatically by clicking on <b>Enter properties</b> (9) in the case of water or steam. In the case of other gases or liquids, the data from the table of gases or liquids (11) is entered, provided that it is listed there.<br>
<b>3. </b>Control element.<br>
<b>4. </b>Diameter of valves and piping, additional data.<br>
<b>5. </b>Calculation.
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<p>
The final screen features <b>Calculation</b> button; click on the button to calculate noise and display the output values.  The noise calculation is carried out in accordance with the standard specified in the header (10).
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<p>
The noise calculation protocol can be exported in the same way as the valve calculation and design, except that the noise calculation is exported on a separate form.
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<img src='ventily_noise_window.jpg' />
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