High School

COOLING SYSTEMS

Circle the letter of the best answer for each question.

18. In what direction is thermal energy moved by an air conditioner?
a. From the room to the hotter outside air
b. From the room to the cooler outside air
c. To the room from the hotter outside air
d. To the room from the cooler outside air

19. How does an air conditioner cool a building?
a. The air conditioner moves thermal energy from areas of lower temperature to areas of higher temperature.
b. The air conditioner has a large thermal conductivity.
c. The air conditioner has a high specific heat.
d. The air conditioner produces a lot of thermal energy.

Cooling and Energy

20. Why do the condenser coils in the back of a refrigerator feel warm?
a. Warm air collects in the back of the refrigerator.
b. Condenser coils are always warm.
c. Thermal energy is brought from the outside.
d. Thermal energy is removed from inside.

21. What is a gas with a boiling point below room temperature called?
a. A natural gas
b. A refrigerant
c. A greenhouse gas
d. A coolant

Answer :

Final answer:

Air conditioners move thermal energy from cooler spaces to warmer ones, cooling the interior. The condenser coils release heat absorbed from inside the refrigerator, and the gases used as refrigerants have low boiling points. This is fundamental to how cooling systems are designed to function.


Explanation:

Cooling Systems and Air Conditioning


Air conditioning systems rely on the principles of thermodynamics to manage thermal energy within a space. Let's break down the questions:



  2. Question 18: In what direction is thermal energy moved by an air conditioner?

    Correct Answer: a. from the room to the hotter outside air.

    An air conditioner works by extracting heat from the cooler air inside the room and transferring it to the outside, which is typically at a higher temperature.


  4. Question 19: How does an air conditioner cool a building?

    Correct Answer: a. The air conditioner moves thermal energy from areas of lower temperature to areas of higher temperature.

    This process might seem counterintuitive, but it operates within the laws of thermodynamics, particularly through the use of refrigerants that absorb heat inside the building and release it outside.


  6. Question 20: Why do the condenser coils in the back of a refrigerator feel warm?

    Correct Answer: d. Thermal energy is removed from inside.

    The condenser coils expel heat that the refrigerator has extracted from its interior, hence feeling warm to the touch.


  8. Question 21: What is a gas with a boiling point below room temperature called?

    Correct Answer: b. a refrigerant.

    Refrigerants are substances used in heat pumps and refrigeration systems and typically have low boiling points, allowing them to evaporate and absorb heat efficiently.



In summary, air conditioners function by transferring heat from inside to outside, which is essential for their cooling capability. Understanding the principles of thermal energy movement and the role of refrigerants is key in grasping how cooling systems work.


Learn more about Cooling Systems here:

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