Hvac

10+ Hvac Interview Questions and Answers

Updated 1 Dec 2021

Q1. What is Different Between VRV and VRF

Ans.

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

Q2. How To Find Refrigeration Pipe Size

Ans.

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

Q3. What's is full Form Of VRV and VRF

Ans.

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

Q4. What's is Full Form Of AHU

Ans.

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.

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Q5. How Many Type of AHU

Ans.

There are several types of AHU, including single-zone, multi-zone, rooftop, and makeup air units.

  • Single-zone AHUs are used in small spaces with consistent heating and cooling needs.

  • Multi-zone AHUs are used in larger spaces with varying heating and cooling needs.

  • Rooftop AHUs are installed on the roof of a building and are commonly used in commercial buildings.

  • Makeup air units are used to replace air that is exhausted from a building.

Q6. What is air conditioner

Ans.

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

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Q7. 1tr = How many CFM

Ans.

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

Q8. How To find TR

Ans.

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

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Q9. What is Thumb Rul

Ans.

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

Q10. What's is Heat

Ans.

Heat is a form of energy that is transferred from one body to another as a result of a difference in temperature.

  • Heat is a form of energy

  • It is transferred from one body to another

  • It occurs due to a difference in temperature

  • Heat can be measured in units such as joules or calories

  • Examples of heat sources include the sun, fire, and electrical appliances

Q11. 1TR = How many BTU

Ans.

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

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