The Physics of Stocks and Flows of Energy Systems by Hassan Qudrat-Ullah

Author:Hassan Qudrat-Ullah
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Rate_Any Flow

Million$/year

‘Level_Any Stock’ * Constant_Any

Constant_Any

1/year

0.05

4.2 Physics of a Negative Feedback Loop: A Goal-Seeking Behavior

Whereas a positive feedback loop seeks an accelerating growth , a negative feedback loop gives rise to a goal-seeking behavior in which the state of a stock variable is driven to a particular value. Consider a generic negative feedback loop, B (as shown in Fig. 4.3), consisting of a single stock, Level_Any Stock, L, a single outflow , Rate_ Any Flow, and a constant, Any_Constant, d. The physics of this basic negative feedback loop is represented by the corresponding stock and flow diagram as shown in Fig. 4.3. Here, we have only one stock, denoted by L. The state of this stock changes through its net inflow rate. Now for a linear system, net outflow is directly proportional to the state of the stock:

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