The Secret of an AHU | AHU काम करता है | AHU का सीक्रेट #ahu

Understanding Air Handling Units (AHUs): The Heart of HVAC Systems

An Air Handling Unit (AHU) is a critical component of modern Heating, Ventilation, and Air Conditioning (HVAC) systems. Often referred to as the "lungs" of a building, the AHU is responsible for regulating and circulating air throughout the internal spaces of commercial, industrial, and residential buildings.

 Air Handling Unit (AHU)?

An AHU is a large metal box containing a combination of components that work together to condition and circulate air. It usually includes:

• Fans (Blowers): Move air across the system and into the ductwork.

• Filters: Remove dust, pollen, and other airborne contaminants.

• Heating and Cooling Coils: Heat or cool the air, often using chilled water, hot water, or refrigerants.

• Humidifiers/Dehumidifiers: Control the moisture content in the air.

• Dampers: Regulate airflow and allow for the mixing of return and fresh air.

Types of AHUs

1. Packaged AHUs: All components are housed in a single unit. Suitable for rooftop or outdoor installation.

2. Modular AHUs: Components are housed separately and can be customized. Ideal for large-scale or specialized facilities.

3. Terminal Units (Fan Coil Units or Unit Ventilators): Smaller units for individual rooms or zones.

Functions of an AHU

• Air Filtration: Ensures a clean and healthy indoor environment.

• Temperature Regulation: Maintains comfort by heating or cooling the air.

• Humidity Control: Prevents mold growth and protects equipment or sensitive materials.

• Ventilation: Brings in fresh air and expels stale air to maintain air quality.

• Air Distribution: Delivers conditioned air to different parts of the building through ductwork.

Maintenance and Energy Efficiency

Regular maintenance of AHUs is essential to ensure system efficiency and longevity. This includes:

• Cleaning or replacing filters

• Inspecting and lubricating fans

• Checking for leaks in coils

• Monitoring sensors and control systems

Energy-efficient AHUs include features like variable speed drives (VSDs) for fans, EC motors, and energy recovery systems that reduce operating costs and environmental impact.

Air Handling Units play a vital role in delivering thermal comfort and clean air to building occupants. Whether you're managing an office tower, hospital, or school, a properly designed and maintained AHU ensures optimal indoor air quality and energy efficiency. As buildings continue to adopt smart technologies, AHUs are also evolving with advanced sensors and control systems, shaping the future of HVAC.

How connect an AHU with Chilled water System | AHU का साथ Chilled Water ...

How to Connect an AHU with a Chilled Water System

Connecting an Air Handling Unit (AHU) to a chilled water system is a common practice in commercial and industrial HVAC systems. This setup allows the AHU to cool the air using chilled water supplied from a central plant. Here's a step-by-step overview of how it works:

1. Supply and Return Piping

Chilled water from the central chiller plant is piped to the AHU through supply and return lines. The supply line delivers cold water to the AHU coil, and the return line sends the warmed water back to the chiller.

2. Cooling Coil Connection

Inside the AHU, the cooling coil is the key component. The chilled water enters the coil, absorbing heat from the air passing over it. The cooled air is then distributed through the duct system to the conditioned spaces.

3. Control Valve Installation

A 2-way or 3-way control valve is installed to regulate the chilled water flow based on the cooling demand. It is typically controlled by a thermostat or Building Management System (BMS).

4. Pump and Flow Control

A circulation pump ensures proper water flow to and from the AHU. Flow meters and balancing valves may be used to maintain correct flow rates.

5. Air Venting and Drainage

Air vents and drain points are installed at the coil to remove trapped air and allow maintenance.

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Final Tips:

• Always insulate chilled water pipes to prevent condensation.

• Ensure proper flushing and pressure testing of the piping before operation.

• Coordinate with controls team to integrate AHU valves with the BMS.

How to install Round Duct

Round duct installation involves placing circular ducts for air distribution in HVAC systems. The process includes:

Round Exhaust Duct installation

• Layout marking on ceiling or wall.

• Cutting and assembling ducts with connectors (e.g., slip joints or flanges).

• Hanging with supports (straps or hangers).

• Sealing joints with mastic or tape for airtightness.

• Insulating (if required) to prevent energy loss.

Round ducts are preferred for better airflow and less pressure drop.

Manlift operating

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