Next, the point with the best value of the quality function is selected (the highest on the 图形最佳化).). In the case where multiple temperatures have the same maximum value of the quality function (within a certain tolerance), the program chooses the lowest of them.
The shape of the quality function also depends on the selected variant of supply temperature optimization:
For the 热输出和压降 criterion, the parameters mainly affecting user comfort are considered, i.e., the possibility of achieving a lower floor temperature, but also theoretically the possibility of changing the floor covering.
For the 最小投资成本 criterion, in addition to the parameters influencing user comfort, investment costs are also taken into account. Hence, solutions that allow for larger pipe spacing and, for example, the use of a manifold with fewer circuits are preferred.
It is possible to obtain an identical supply temperature value for both optimization criteria, but most often the program will then select different values of pipe spacing. This results from the fact that the quality function for temperature behaves differently for the two criteria, although its maximum may occur at the same point. However, for the same value under the 最小投资成本 criterion, the program will select a larger spacing in order to reduce the total pipe length.
An error message may occur indicating that it is not possible to determine the supply temperature (e.g., if the required heating capacity is too high compared to the system’s capability). In such a case, the program adopts the maximum value defined for the given control circuit (source/mixing valve/mixing unit).
