Qualitative Reasoning - Advanced Artificial Intelligence - page 156

will begin. All the possible variations of the semi-order relations concerned with
the restraint quantity confirm the variation path of the current activated process.
Here we explain the deduction course of process approach, taking the process
description of boiler heating process as example. Boiler has a container full of
water. The cover of the boiler is sealed when heating. Fire is the heat source. The
boiler will explode when the pressure in the container exceeds p-burst(CAN),
assuming that the temperature of the heat source does not changed.
Fig. 4.1. The process description of boiler heating process
Fig 4.1 gives the process description of boiler heating process, among which
PS is the process structure, LH is the restraint assumption, IS is the individual.
Following is the process explanation of the boiler heating process.
When begins from ① , process structure only contains hear-flow, which ②
and ③ can be derived from. In ② , the temperature of water equals to the
temperature of heat source, then the process of heat-flow ends. In ③ , water
begins to boil, which can be described by processes of heat-flow and boiling.
Then ④ , ⑦ , ⑧ , ⑨ can occur. In ④ , water dries out, which can derive the
explosion process in ⑤ or the end when the steam temperature reaches the heat