Which of the following parameters remains constant during chemical dehumidifica-tion?

ANS:A - Dry bulb temperature

Dry bulb temperature is a fundamental meteorological and thermodynamic parameter that represents the temperature of the air without consideration of its moisture content. Here's an explanation:

1. Definition: Dry bulb temperature, often simply referred to as temperature, is the most commonly measured temperature parameter in meteorology and engineering. It represents the actual temperature of the air as measured by a standard thermometer.
2. Measurement: Dry bulb temperature is measured using a thermometer whose bulb is shielded from any moisture, hence the term "dry bulb." The thermometer is typically placed in a shaded area to prevent direct exposure to sunlight, ensuring an accurate measurement of the air temperature.
3. Representation: Dry bulb temperature is expressed in degrees Celsius (°C) or Fahrenheit (°F), depending on the preference or standard of measurement. It provides a quantitative measure of the thermal energy present in the air molecules, regardless of their moisture content.
4. Importance: Dry bulb temperature is a crucial parameter in various fields, including meteorology, HVAC (heating, ventilation, and air conditioning) engineering, environmental science, and process engineering. It influences weather patterns, human comfort, building design, energy consumption, and many other aspects of daily life and industrial processes.
5. Relation to Humidity: Unlike wet bulb temperature or dew point temperature, which account for the effects of moisture on air temperature, dry bulb temperature solely reflects the thermal energy of the air molecules. Therefore, it remains constant during processes that involve the addition or removal of moisture, such as evaporation, condensation, or dehumidification.
6. Application: Dry bulb temperature is used in various calculations and analyses, such as determining psychrometric properties of air, calculating heating and cooling loads for buildings, assessing thermal comfort conditions, and predicting weather patterns.

In summary, dry bulb temperature is the temperature of the air measured without consideration of its moisture content. It is a fundamental parameter used in meteorology, engineering, and environmental science to describe the thermal energy present in the air and its influence on various processes and phenomena.