Question

A small generating plant is to be designed to satisfy a constant 20 MW load Two alternatives are being considered:

a) 2 × 20 MW units
b) 3 × 15 MW units
Compare between the two alternatives based on expected load loss.

Answer 1

When comparing the two alternatives for the small generating plant, it is important to consider the expected load loss. Alternative 1 with 2 × 20 MW units is more reliable in terms of load loss as even if one unit fails, the other can still satisfy the load.

Step-by-step explanation:

When comparing the two alternatives for the small generating plant, which are 2 × 20 MW units and 3 × 15 MW units, we need to consider the expected load loss. Load loss refers to the amount of power that is wasted or not utilized effectively in the system. In this case, the constant 20 MW load needs to be satisfied.

Alternative 1: 2 × 20 MW units

In this alternative, there are two units each capable of generating 20 MW of power. If one unit fails, the other can still satisfy the entire load. Therefore, the expected load loss is low because even if one unit fails, the other unit can still handle the load.

Alternative 2: 3 × 15 MW units

In this alternative, there are three units each capable of generating 15 MW of power. If one unit fails, the remaining two units can still satisfy the entire load. However, if two units fail, there will be a load loss because the remaining unit can only handle 15 MW, which is less than the required 20 MW.

Based on the comparison, the first alternative with 2 × 20 MW units is more reliable in terms of load loss because even if one unit fails, the other unit can still satisfy the load.