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Control valve rangeability: KVS/KV0. The theoretical range between the maximal (KVS) and minimal (KV0) controllable flows. By default, the parameter is set at 30100.
Control valve real rangability: KVS/KVr. The real controllable range between the maximal (KVS) and minimal (KVr) controllable flows. This value is always smaller than the theoretical range. By default, the parameter is set at 2595.
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The greater the rangability values, the better the control action of the valve. When you notice in the software that the lift of a control valve is cycling continuously (usually between small values), it might be useful to further increase the rangeabilitiesfrom 30 & 25 to 100 & 95 or even to 500 & 495. This usually leads to a more stable control output, which can drastically reduce simulation times, but it might make the theoretical simulation to perfect. The downside of this action is possibly a too perfect, theoretical simulation. |
Minimal authority: The lower limit that is imposed to the Optimiser while running the ‘Optimise components’ step. By default, the parameter is set at 0.3. More information on a valve’s authority can be found here: https://hysopt.atlassian.net/wiki/spaces/HRM/pages/3089204794/Control+valve+authority.
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