18 Questions
What is the primary mechanism by which evaporative cooling reduces the temperature of a system?
Evaporation of water
In the context of evaporative cooling, what is the purpose of storing water in earthen pots?
To reduce heat gain from the surroundings through conduction
Where has evaporative cooling been used for centuries to obtain cold water?
India
What is the primary advantage of using evaporative cooling over nocturnal cooling?
It is more practical
What is the essential condition required for nocturnal cooling to occur?
Still air
What is the approximate temperature of the stratosphere, which is relevant to nocturnal cooling?
-55°C
What is the primary mechanism by which sweating helps to cool the body?
Evaporation of sweat from the skin, which absorbs heat
What is the primary purpose of the salt in natural refrigeration methods?
To absorb heat from the solution, cooling it
What is the term for the process by which a liquid evaporates from a surface, cooling the surface?
Evaporative cooling
What is the limitation of natural refrigeration methods using salt solutions?
The dissolved salt must be recovered from the solution by heating
What is the result of the heat absorption from the water in the earthen vessel?
The water becomes cooler
What is the role of the sweat droplets on the skin in regulating temperature?
They help to regulate temperature through evaporative cooling
What is the primary function of the evaporator in a refrigeration system?
To vaporize the refrigerant liquid into a low-pressure vapor
What is the role of the fan in an air-cooled evaporator?
To circulate air from the cooled space across the evaporator coils
What type of evaporator is classified as 'dry'?
Air-cooled evaporator
What is the cause of most evaporator problems?
Dirt on the coils or restricted airflow
What is the purpose of the constant flow of refrigerant through the evaporator?
To keep the evaporator cool
What is the characteristic of the refrigerant at the end of the evaporator in an air-cooled evaporator?
It is a low-pressure vapor
Learn about the principle of nocturnal cooling, a natural refrigeration method that utilizes the clear night sky to radiate heat into the stratosphere. Discover how to create the ideal conditions for nocturnal cooling, including the importance of a clear sky, still air, and a shallow earthen container. Test your knowledge of this innovative and eco-friendly cooling technique.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
