10+ Hvac Site Engineer Interview Questions and Answers

HEPA filters are used in clean room applications with a minimum efficiency of 99.97% for particles as small as 0.3 microns.

• HEPA filters are commonly used in clean room applications

• HEPA filters have a minimum efficiency of 99.97% for particles as small as 0.3 microns

• ULPA filters are also used in some clean room applications and have a minimum efficiency of 99.999% for particles as small as 0.12 microns

Chiller trip HP can occur due to various issues; identifying the cause involves checking system parameters and components.

• Check for low refrigerant levels; this can cause the chiller to trip due to insufficient cooling.

• Inspect electrical connections and components for faults; loose connections can lead to power issues.

• Monitor the temperature and pressure readings; abnormal values may indicate system malfunctions.

• Examine the control system for errors or alarms; these can provi...read more

A step-by-step process to safely start a chiller plant for efficient operation.

• 1. Ensure all safety protocols are in place, including PPE for personnel.

• 2. Check the chiller plant's control panel for any alarms or faults.

• 3. Verify that all valves are in the correct position (open/closed) as per the operational requirements.

• 4. Inspect the water supply and return lines for leaks or blockages.

• 5. Start the chilled water pump to ensure proper flow before activating the chiller.

• 6. G...read more

Refrigeration cycles are processes that remove heat from a space and transfer it elsewhere.

• The vapor compression cycle is the most common refrigeration cycle used in HVAC systems.

• The absorption cycle uses a refrigerant that is absorbed into a solution and then released through heat.

• The steam jet cycle uses steam to create a vacuum and remove heat from a space.

• The air cycle uses compressed air to cool a space.

• The thermoelectric cycle uses a solid-state device to transfer heat....read more

I have 5 years of experience as an HVAC Site Engineer. I have worked on projects with 50+ machines and have experience in preparing BOQ details.

• 5 years of experience as an HVAC Site Engineer

• Worked on projects with 50+ machines

• Experience in preparing BOQ details

AHU issues can arise from mechanical failures, electrical problems, or improper maintenance, affecting HVAC performance.

• 1. Power Supply Issues: Check if the AHU is receiving power; a blown fuse or tripped circuit breaker can cause it to stop working.

• 2. Faulty Components: Components like fans, motors, or sensors may fail; for example, a malfunctioning fan motor can prevent airflow.

• 3. Clogged Filters: Dirty or clogged air filters can restrict airflow, leading to overheating and...read more

Chiller delta approach refers to the temperature difference between supply and return water in HVAC systems.

• The delta T (ΔT) is crucial for determining chiller efficiency.

• A typical ΔT for chilled water systems is around 10°F (5.5°C).

• Higher ΔT can indicate better system performance but may lead to issues like reduced flow.

• Monitoring ΔT helps in diagnosing system problems, such as blockages or pump failures.

• Example: If the supply water is 45°F and return is 55°F, ΔT is 10°F.

Relative humidity is the amount of moisture in the air compared to the maximum amount it can hold at a given temperature.

• Relative humidity is expressed as a percentage.

• Higher relative humidity means the air is holding more moisture.

• Relative humidity affects how comfortable we feel in a room.

• HVAC systems can control relative humidity levels in a building.

• Low relative humidity can cause dry skin, static electricity, and other issues.

• High relative humidity can lead to mold growt...read more

AHU stands for Air Handling Unit, which is responsible for circulating and conditioning air in a HVAC system.

• AHU circulates and conditions air in a HVAC system

• It filters and cleans the air before distributing it throughout the building

• It controls the temperature, humidity, and air quality in the building

• AHU typically consists of a fan, heating or cooling coils, filters, and dampers

• Examples of AHU include rooftop units, packaged units, and ducted units

HVAC cycles involve processes like refrigeration and air conditioning to regulate indoor climate effectively.

• 1. Refrigeration Cycle: Utilizes refrigerants to absorb heat from indoors and release it outside.

• 2. Heat Pump Cycle: Can both heat and cool spaces by reversing the refrigeration cycle.

• 3. Ventilation Cycle: Ensures fresh air circulation and removes stale air, improving indoor air quality.

• 4. Dehumidification Cycle: Reduces humidity levels by cooling air below its dew poi...read more

Chiller approach refers to the temperature difference between the chilled water supply and return in HVAC systems.

• The approach is typically measured in degrees Fahrenheit or Celsius.

• A common approach value is 5°F (2.8°C), indicating efficient heat exchange.

• Lower approach values can indicate better chiller performance.

• For example, if the supply water is at 45°F and return is at 50°F, the approach is 5°F.

HVAC system stands for Heating, Ventilation, and Air Conditioning system, which is used to control the temperature, humidity, and air quality in a building.

• HVAC system includes components such as furnaces, air conditioners, heat pumps, ductwork, and thermostats.

• It is designed to provide thermal comfort and acceptable indoor air quality.

• HVAC systems can be used in residential, commercial, and industrial buildings.

• Regular maintenance of HVAC systems is important to ensure effic...read more

HVAC stands for heating, ventilation, and air conditioning. It refers to the systems used to control the temperature, humidity, and air quality in buildings.

• HVAC systems are responsible for heating and cooling buildings to maintain a comfortable environment for occupants.

• Ventilation systems help circulate and filter air to improve indoor air quality.

• Air conditioning systems remove heat from indoor spaces to cool them down.

• Examples of HVAC equipment include furnaces, air condi...read more

I have 8 years of experience in HVAC engineering.

• I have worked on various HVAC projects, including commercial buildings, hospitals, and industrial facilities.

• I am experienced in designing HVAC systems, selecting equipment, and performing load calculations.

• I have knowledge of HVAC codes and standards, such as ASHRAE and NFPA.

• I have successfully managed HVAC installation and commissioning projects.

• I am proficient in using HVAC design software, such as AutoCAD and Revit.

• I have p...read more

The HVAC system work is responsible for designing, installing, and maintaining heating, ventilation, and air conditioning systems in buildings.

• Designing HVAC systems based on building requirements and specifications

• Installing HVAC equipment, including ductwork, piping, and control systems

• Performing regular maintenance and repairs to ensure optimal system performance

• Troubleshooting and diagnosing issues with HVAC systems

• Ensuring compliance with safety and environmental regulat...read more