Chapter 6, Problem 6.15P

Interpretation Introduction

(a)

Interpretation:

The rate of intake of air at ambient conditions in cubic feet per minute needs to be determined.

Concept introduction:

In air the humidity plays a very important role in our daily life and it is also important for the weather because the weather depending on humidity and without humidity there is no weather and it is dangerous to live on earth. There are two main types of humidity which is relative humidity and absolute humidity.

The volume of Air at ambient condition is calculated as:

$v_a=\frac{m{v}_a}{1-w_a}$

Here,

$\begin{array}{l}{\text{w}}_{\text{a}}\text{=Humidity}\text{ratio}\text{at}\text{ambient}\text{condition}\\ {\text{v}}_{\text{a}}\text{=Specific}\text{Humidity}\text{at}\text{ambient}\text{condition}\\ {\text{w}}_{\text{i}}\text{=Humidity}\text{ratio}\text{at}\text{inlet}\text{condition}\\ {\text{v}}_{\text{i}}\text{=Specific}\text{Humidity}\text{at}\text{inlet}\text{condition}\end{array}$

Interpretation Introduction

(b)

Interpretation:

The number of hours of operation required to fill the cistern needs to be determined.

Concept introduction:

In air the humidity plays a very important role in our daily life and it is also important for the weather because the weather depending on humidity and without humidity there is no weather and it is dangerous to live on earth. There are two main types of humidity which is relative humidity and absolute humidity.

Here,

$\begin{array}{l}{\text{w}}_{\text{a}}\text{=Humidity}\text{ratio}\text{at}\text{ambient}\text{condition}\\ {\text{v}}_{\text{a}}\text{=Specific}\text{Humidity}\text{at}\text{ambient}\text{condition}\\ {\text{w}}_{\text{i}}\text{=Humidity}\text{ratio}\text{at}\text{inlet}\text{condition}\\ {\text{v}}_{\text{i}}\text{=Specific}\text{Humidity}\text{at}\text{inlet}\text{condition}\end{array}$

The time required in hours of operation required to fill the cistern as follows:

$\text{t}=\frac{\text{Volume}\text{of}\text{Cistern}}{\text{Volume}\text{of}\text{water}\text{removal}\text{per}\text{minute}}$