10+ Hvac Interview Questions and Answers

VRV and VRF are both air conditioning systems that use refrigerant to cool or heat a space, but VRV is a trademarked term by Daikin while VRF is a generic term used by other manufacturers.

• VRV is a trademarked term by Daikin while VRF is a generic term used by other manufacturers

• VRV systems have a larger capacity and can connect more indoor units than VRF systems

• VRF systems are more flexible and can handle varying loads and temperatures better than VRV systems

• Both systems use ...read more

Refrigeration pipe size is determined by the required cooling capacity, distance, and pressure drop.

• Calculate the required cooling capacity

• Determine the distance between the evaporator and condenser

• Consider the pressure drop in the system

• Refer to manufacturer's tables or use pipe sizing software

• Choose the appropriate pipe size based on the calculated values

VRV stands for Variable Refrigerant Volume and VRF stands for Variable Refrigerant Flow.

• VRV and VRF are both HVAC systems that use refrigerant to cool or heat a space.

• They are both energy-efficient and allow for individual temperature control in different zones.

• VRV is a trademarked term by Daikin, while VRF is a more generic term used by other manufacturers.

• Both systems use a variable speed compressor to adjust the refrigerant flow based on the cooling or heating demand.

• VRV a...read more

AHU stands for Air Handling Unit.

• AHU is a device used to regulate and circulate air as part of a heating, ventilation, and air conditioning (HVAC) system.

• It is responsible for conditioning the air by cooling, heating, humidifying, dehumidifying, filtering, and distributing it throughout a building.

• AHUs are commonly found in commercial and industrial buildings, as well as in residential settings.

• Examples of AHUs include rooftop units, packaged units, and split systems.

An air conditioner is a device that cools and dehumidifies indoor air to create a comfortable environment.

• Air conditioners work by removing heat and moisture from the air.

• They use refrigerants to transfer heat from inside to outside.

• There are different types of air conditioners, including window units, central systems, and portable units.

• Air conditioners can also improve indoor air quality by filtering out pollutants and allergens.

• Regular maintenance is important to keep air ...read more

1 TR is equal to 400 CFM approximately.

• TR stands for 'ton of refrigeration'

• CFM stands for 'cubic feet per minute'

• The conversion factor is approximately 400 CFM per 1 TR

• This conversion is used in HVAC systems to determine the required airflow for cooling or heating

TR can be found by calculating the cooling load of a space and dividing it by 12,000.

• Calculate the cooling load of the space in BTUs per hour

• Divide the cooling load by 12,000 to get the TR

• Consider factors such as the size of the space, number of occupants, and equipment heat gain

• TR = Cooling Load (BTU/hr) / 12,000

Thumb rule is a general guideline or principle that is based on experience and common sense.

• Thumb rules are used in HVAC to estimate the size of equipment or ductwork based on the square footage of the space being cooled or heated.

• For example, a common thumb rule for air conditioning is to have 1 ton of cooling capacity for every 400-500 square feet of space.

• Thumb rules are not always accurate and should be used with caution, as every building and situation is unique.

• They can...read more

1TR is equal to 12,000 BTU per hour.

• TR stands for 'ton of refrigeration'

• BTU stands for 'British Thermal Unit'

• 1TR is equivalent to removing 12,000 BTUs of heat per hour

• This conversion is commonly used in the HVAC industry