Finals Flashcards
What are the four main functions that HVAC systems regulate?
Temperature, humidity, air quality, air movement
What is the primary purpose of HVAC systems?
To provide thermal comfort and acceptable indoor air quality
During which historical period did significant advancements in HVAC technology occur?
The Industrial Revolution
What do modern HVAC systems integrate for efficiency?
Heating, cooling, and ventilation
List three factors influencing HVAC design.
- Building characteristics
- Climate and location
- Occupancy and usage
What are the three principles of heat transfer in HVAC systems?
- Conduction
- Convection
- Radiation
Fill in the blank: The process of heat transfer through direct contact is called _______.
Conduction
Fill in the blank: The primary method of heat distribution in HVAC systems is _______.
Convection
What is the function of the compressor in the refrigeration cycle?
Increases the pressure and temperature of the refrigerant vapor
What happens during the condensation stage of the refrigeration cycle?
The hot refrigerant vapor releases heat and condenses into a high-pressure liquid
What is the purpose of an expansion valve in the refrigeration cycle?
Reduces the pressure and temperature of the refrigerant
What heating technologies are commonly used in HVAC systems?
- Combustion
- Electric resistance
- Heat pumps
True or False: Modern HVAC systems do not focus on energy efficiency.
False
What components are typically found in Air Handling Units (AHUs)?
- Fans
- Heating and cooling coils
- Filters
- Dampers
What is the primary role of chillers in HVAC systems?
Remove heat from water for cooling
List the two types of air distribution devices in HVAC systems.
- Diffusers
- Grilles
What is mechanical ventilation in HVAC systems?
Uses fans to circulate fresh air into buildings, removing stale air
What does CO2 monitoring in HVAC systems measure?
Carbon dioxide levels as an indicator of air quality and occupancy
What is essential for proper system sizing in HVAC design?
Accurate heating and cooling load calculations
What is one benefit of using a programmable thermostat?
Regulates indoor temperature without manual intervention
Fill in the blank: To prevent energy wastage, it is important to _______ your HVAC system when not in use.
Turn off
What is the role of humidity control in HVAC systems?
Maintains optimal humidity levels to prevent mold growth and enhance comfort
What does the process of air balancing involve?
Adjusting airflow to ensure proper distribution throughout the building
True or False: Regular maintenance of HVAC systems is not necessary.
False
What are two key trends in modern HVAC systems?
- Smart technologies
- Energy-efficient designs
