Heating Ventilating and Air Conditioning: Analysis and Design
Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
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Chapter 4, Problem 4.1P

Using Fig. 4-1, draw a conclusion about the comfort of a mixed group of men and women in typical seasonal clothing, with sedentary activity for the following cases:

a. Summer, operative temperature 77 F, wb 64 F

b. Winter, operative temperature. 77 F, wb 64 F

c. Summer, operative temperature 75 F, dp 50 F

d. Winter, operative temperature 73 F, dp 34 F

(a)

Expert Solution
Check Mark
To determine

The comfort of mixed group of men and women in typical seasonal clothing.

Answer to Problem 4.1P

According to given condition, the group will feel comfortable.

Explanation of Solution

Given:

The operating temperature of summer is 77F .

The wet bulb temperature of summer is 64F .

Calculation:

From fig4-1,

According to ASHRAE standard, the acceptable range of operating temperature is 77F and wet bulb temperature is 64F on summer the mixed group of men and women will feel comfortable during this season because at this operating temperature the relative humidity reaches to 60% .

(b)

Expert Solution
Check Mark
To determine

The comfort of mixed group of men and women in typical seasonal clothing.

Answer to Problem 4.1P

According to given condition, the group will not feel comfortable.

Explanation of Solution

Given:

The operative temperature of winter is 77F .

The wet bulb temperature of winter is 64F .

Calculation:

From fig4-1,

According to ASHRAE standard, the acceptable range of operating temperature is 77F and wet bulb temperature is 64F on winter the mixed group of men and women will feel comfortable during this season because at this operating temperature the relative humidity reaches to 60% due to this the temperature is maintained in this season.

(c)

Expert Solution
Check Mark
To determine

The comfort of mixed group of men and women in typical seasonal clothing.

Answer to Problem 4.1P

According to given condition, the group will feel comfortable

Explanation of Solution

Given:

The operative temperature of summer is 75F .

The dew temperature of summer is 50F .

Calculation:

From fig4-1,

According to ASHRAE standard, the acceptable range of operating temperature is 75F and wet bulb temperature is 50F on summer the mixed group of men and women will feel comfortable during this season because at this operating temperature the relative humidity reaches to 40% so that the temperature is maintained in this summer season.

(d)

Expert Solution
Check Mark
To determine

The comfort of mixed group of men and women in typical seasonal clothing.

Answer to Problem 4.1P

According to given condition, the group will feel uncomfortable.

Explanation of Solution

Given:

The operative temperature of winter is 73F .

The dew temperature of winter is 34F .

Calculation:

From fig4-1,

According to ASHRAE standard, the acceptable range of operating temperature is 73F and wet bulb temperature is 34F on winter the mixed group of men and women will feel uncomfortable during this season because at this operating temperature the relative humidity decrease to 30% due to this the temperature produce more heat in this winter season.

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Heating Ventilating and Air Conditioning: Analysis and Design

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