Understanding Heat in HVAC Systems

Which of the following is an example of heat transfer by conduction?

• Heat from the sun warming your face

• Heat from a stove warming a metal pot

• Warm air rising to the ceiling

• Heat from a fireplace warming a room

Tags

DOK Level 2: Skill/Concept

In an HVAC system, which of the following best describes the role of a refrigerant?

• It absorbs heat from the indoor air and releases it outside.

• It generates heat to warm the indoor air.

• It filters the air to remove impurities.

• It circulates air throughout the building.

Tags

DOK Level 2: Skill/Concept

Which method of heat transfer is primarily involved when warm air rises and cool air sinks in a room?

• Conduction

• Convection

• Radiation

• Insulation

Tags

DOK Level 2: Skill/Concept

What is the primary function of a heat exchanger in an HVAC system?

• To increase the temperature of the refrigerant

• To transfer heat between two fluids without mixing them

• To filter out dust and particles from the air

• To circulate air throughout the building

Tags

DOK Level 2: Skill/Concept

Which of the following equations represents the first law of thermodynamics?

Tags

DOK Level 2: Skill/Concept

In the context of HVAC systems, what does the term "latent heat" refer to?

• The heat required to change the temperature of a substance

• The heat required to change the state of a substance without changing its temperature

• The heat lost to the surroundings

• The heat generated by electrical components

Tags

DOK Level 2: Skill/Concept

Which of the following best describes the process of radiation in heat transfer?

• Heat transfer through direct contact

• Heat transfer through a fluid medium

• Heat transfer through electromagnetic waves

• Heat transfer through insulation

Tags

DOK Level 2: Skill/Concept

In an HVAC system, what is the purpose of the evaporator coil?

• To absorb heat from the indoor air

• To release heat to the outdoor air

• To circulate refrigerant

• To filter the air

Tags

DOK Level 2: Skill/Concept

Which of the following is an example of heat transfer by convection in an HVAC system?

• Heat moving through the walls of a duct

• Warm air being blown into a room by a fan

• Heat radiating from a hot surface

• Heat being conducted through a metal pipe

Tags

DOK Level 2: Skill/Concept

• It represents the amount of heat required to change the temperature of a unit mass of a substance by one degree Celsius.

• It represents the total heat energy in a system.

• It represents the pressure exerted by a gas.

• It represents the volume of a gas at standard temperature and pressure.

Tags

DOK Level 2: Skill/Concept