Nocturnal Cooling: Principles of Natural Refrigeration
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Questions and Answers

What is the primary mechanism by which evaporative cooling reduces the temperature of a system?

  • Conduction of heat from the surroundings
  • Convection of air around the system
  • Evaporation of water (correct)
  • Radiation of heat into the stratosphere
  • 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 (correct)
  • To increase the surface area of the water
  • To radiate heat into the stratosphere
  • To decrease the temperature of the surrounding air
  • Where has evaporative cooling been used for centuries to obtain cold water?

  • Europe
  • India (correct)
  • Africa
  • China
  • What is the primary advantage of using evaporative cooling over nocturnal cooling?

    <p>It is more practical</p> Signup and view all the answers

    What is the essential condition required for nocturnal cooling to occur?

    <p>Still air</p> Signup and view all the answers

    What is the approximate temperature of the stratosphere, which is relevant to nocturnal cooling?

    <p>-55°C</p> Signup and view all the answers

    What is the primary mechanism by which sweating helps to cool the body?

    <p>Evaporation of sweat from the skin, which absorbs heat</p> Signup and view all the answers

    What is the primary purpose of the salt in natural refrigeration methods?

    <p>To absorb heat from the solution, cooling it</p> Signup and view all the answers

    What is the term for the process by which a liquid evaporates from a surface, cooling the surface?

    <p>Evaporative cooling</p> Signup and view all the answers

    What is the limitation of natural refrigeration methods using salt solutions?

    <p>The dissolved salt must be recovered from the solution by heating</p> Signup and view all the answers

    What is the result of the heat absorption from the water in the earthen vessel?

    <p>The water becomes cooler</p> Signup and view all the answers

    What is the role of the sweat droplets on the skin in regulating temperature?

    <p>They help to regulate temperature through evaporative cooling</p> Signup and view all the answers

    What is the primary function of the evaporator in a refrigeration system?

    <p>To vaporize the refrigerant liquid into a low-pressure vapor</p> Signup and view all the answers

    What is the role of the fan in an air-cooled evaporator?

    <p>To circulate air from the cooled space across the evaporator coils</p> Signup and view all the answers

    What type of evaporator is classified as 'dry'?

    <p>Air-cooled evaporator</p> Signup and view all the answers

    What is the cause of most evaporator problems?

    <p>Dirt on the coils or restricted airflow</p> Signup and view all the answers

    What is the purpose of the constant flow of refrigerant through the evaporator?

    <p>To keep the evaporator cool</p> Signup and view all the answers

    What is the characteristic of the refrigerant at the end of the evaporator in an air-cooled evaporator?

    <p>It is a low-pressure vapor</p> Signup and view all the answers

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