Exam 35: Comfort and Psychrometrics

The air leaving an evaporator has a dry-bulb temperature of 85°F and a wet-bulb temperature of 65°F. The air entering the evaporator has a dry-bulb temperature of 95°F and a wet-bulb temperature of 75°F. How many grains of moisture per pound of dry air were removed by the evaporator?

The human body is comfortable when the heat produced in the body is equal to the heat lost to the surroundings.

Water, in the form of low-pressure vapor, is suspended in the air and is called ____________________.

When the dry-bulb and wet-bulb temperatures are the same, the relative humidity of the air is ____________________%.

Under what conditions can the wet-bulb temperature be higher than the dry-bulb temperature?

The dew-point temperature is the ____.

If the dry-bulb temperature is 93°F and the wet-bulb temperature is 60°F, what is the specific volume of the air?

What is the dew-point temperature if the wet-bulb temperature is 65°F and the dry-bulb temperature is 100°F?

The dry-bulb temperature is the ____.

Of the heat produced in the human body, which is by perspiration?

Typically, when the body is at rest (sitting) and in surroundings of ____________________°F and 50% humidity with a slight air movement, the body is close to being comfortable.

What is the relative humidity if the dry-bulb temperature is 100º F and the wet-bulb temperature is 65°F?

Explain how a wet-bulb thermometer works.

Air consists of approximately 78% ____________________, 21% oxygen, and 1% other gases.

The closer the wet-bulb and dry-bulb temperatures are to each other, the higher the ____________________.