Chapter 1, Problem 1.24P

Interpretation Introduction

(a)

Interpretation:

The area of solar panel needed to meet the average critical needs of a residence in each city should be calculated.

Concept Introduction:

The area of panel can be calculated using the following formula:

$\text{A = }\frac{\text{E}}{\text{IE }}$

Here, A is area of panel, E is energy used and IE is incident energy.

Interpretation Introduction

(b)

Interpretation:

In each city, the current average annual cost of electricity should be calculated.

Concept Introduction:

The average annual cost can be calculated from average cost of electricity and annual electricity used as follows:

$\text{Average annual cost = Average cost of electricty × Annual electricty used }$

Interpretation Introduction

(c)

Interpretation:

The future increases in electricity prices offset the cost of borrowing funds for the initial purchase should be determined.

Concept Introduction:

The cost per square meter can be calculated from average cost for 20 years and incident energy as follows:

$\text{C = }\frac{{\text{C}}_{\text{Avg (20years})}}{\text{IE}}$

Here, C is cost per square meter, ${\text{C}}_{\text{Avg (20years})}$ is average cost for 20 years and IE is incident energy.