AHU for Manufacturing Plants

What Is an AHU for Manufacturing Plants?

An Air Handling Unit (AHU) is HVAC equipment used to condition and distribute air within manufacturing and industrial facilities.

Depending on the application, an industrial AHU can include:

• Fresh-air intake section
• Return-air section
• Mixing section
• Pre-filters
• Fine filters
• Cooling coil
• Heating coil where required
• Dehumidification
• Humidification where required
• Supply fan
• VFD
• Control dampers
• Temperature sensors
• Humidity sensors
• Differential-pressure monitoring
• BMS integration
• Condensate drainage
• Access and maintenance sections

The AHU configuration should be selected according to the manufacturing process, heat load, ventilation requirements, building layout and environmental conditions.

Why Is HVAC Important for Manufacturing Plants?

Manufacturing processes can produce substantial internal heat and airborne contaminants.

Industrial facilities may have heat sources such as:

• Production machinery
• Motors
• Furnaces
• Compressors
• Electrical equipment
• Lighting
• Welding equipment
• Process equipment
• Personnel
• Solar heat gain

Depending on the manufacturing process, the facility may also generate:

• Dust
• Fumes
• Smoke
• Vapors
• Odors
• Moisture
• Process contaminants

The HVAC and ventilation system should therefore be designed around the actual manufacturing process.

Industrial HVAC Design for Manufacturing Plants

Industrial HVAC design should start with an understanding of the production process.

Important design considerations include:

• Cooling load
• Heating load
• Process heat
• Fresh-air requirements
• Exhaust requirements
• Air changes
• Temperature
• Humidity
• Filtration
• Air distribution
• Pressure relationships
• Indoor-air quality
• Worker comfort
• Equipment operating conditions

A suitable industrial HVAC strategy may combine AHUs, ventilation fans, exhaust systems, chillers, cooling towers, VRF/VRV systems, evaporative cooling or other technologies depending on the facility.

Manufacturing Plant AHU Design Requirements

1. Cooling Load Calculation

Industrial cooling loads can be substantially different from commercial buildings.

The calculation may consider:

• Machinery heat
• Production equipment
• Motors
• Lighting
• Workers
• Solar heat gain
• Outdoor air
• Process loads
• Building envelope
• Operating schedules

Accurate calculations help determine the required AHU airflow and cooling capacity.

2. Fresh Air & Ventilation

Fresh-air ventilation can help provide outdoor air to occupied areas and support the removal or dilution of indoor contaminants.

Fresh-air requirements depend on:

• Occupancy
• Manufacturing process
• Room size
• Outdoor conditions
• Contaminant generation
• Exhaust requirements
• Applicable ventilation criteria

Fresh-air systems should be coordinated with the building’s exhaust strategy.

Industrial Ventilation System

Industrial ventilation is an important part of manufacturing plant HVAC.

A ventilation system can include:

• Fresh-air fans
• Exhaust fans
• AHUs
• Supply-air ducts
• Exhaust ducts
• Louvers
• Filters
• Dust collectors
• Fume extraction systems
• Make-up air systems
• Dampers
• Control systems

The ventilation strategy should be based on the specific contaminants and process conditions present in the plant.

Local Exhaust Ventilation

Where a manufacturing process produces dust, fumes, vapors or other contaminants, local exhaust ventilation (LEV) may be appropriate.

LEV attempts to capture contaminants close to their source rather than allowing them to disperse throughout the production area.

Potential applications include:

• Welding areas
• Chemical processes
• Grinding
• Cutting
• Painting
• Mixing
• Heat-treatment processes
• Material handling

The exhaust system should be engineered according to the process and contaminant characteristics.

AHU for Factory Production Areas

Production areas can have different HVAC requirements depending on the process.

The HVAC system may be designed to control:

• Temperature
• Humidity
• Airflow
• Fresh air
• Filtration
• Heat removal
• Air distribution

Production areas with high heat loads may require higher airflow or dedicated cooling systems.

AHU for Industrial Warehouses

Warehouses may require HVAC depending on:

• Stored materials
• Product temperature requirements
• Worker occupancy
• Building height
• Heat gain
• Storage conditions
• Fresh-air requirements

The HVAC solution can include AHUs, ventilation fans, evaporative cooling, exhaust systems or other appropriate technologies.

AHU for Process Areas

Process areas may require tighter environmental control than general factory spaces.

Depending on the application, HVAC systems can provide:

• Controlled temperature
• Humidity control
• Filtration
• Fresh air
• Pressure control
• Dedicated exhaust
• Process ventilation

Pharmaceutical, electronics, food-processing and other specialized manufacturing facilities may require additional environmental controls.

Industrial Air Conditioning

Industrial air conditioning involves more than simply cooling the factory.

The system should consider:

• Sensible heat
• Latent heat
• Process heat
• Outdoor air
• Equipment loads
• Worker comfort
• Humidity
• Ventilation
• Air distribution
• Operating schedules

Possible cooling technologies include:

• Chilled-water AHUs
• Air-cooled chillers
• Water-cooled chillers
• VRF/VRV
• Packaged systems
• Evaporative cooling
• Dedicated process cooling

The appropriate technology depends on the plant and process requirements.

Temperature & Humidity Control

Certain manufacturing processes require controlled temperature and humidity.

Humidity can affect:

• Raw materials
• Production processes
• Product quality
• Packaging
• Electronics
• Powder handling
• Corrosion
• Static electricity

An industrial AHU can incorporate:

• Cooling coils
• Heating coils
• Reheat
• Dehumidification
• Humidification
• Temperature sensors
• Humidity sensors
• Automatic controls

Industrial HVAC Filtration

Filtration should be selected according to the contaminants and indoor-air-quality requirements of the manufacturing plant.

Potential filtration stages include:

Outdoor Air → Pre-Filter → Fine Filter → Cooling Coil → Fan → Supply Air

Additional filtration or specialized equipment may be required for specific industrial processes.

Possible solutions include:

• Bag filters
• Panel filters
• Fine filters
• HEPA filters where required
• Dust collectors
• Fume filtration
• Process-specific filtration

The correct filtration system depends on the contaminant and process.

Manufacturing Plant Air Distribution

Air distribution should be designed according to the building layout and process.

Important considerations include:

• Supply-air quantity
• Return-air quantity
• Air velocity
• Ceiling height
• Equipment location
• Worker areas
• Heat sources
• Exhaust locations
• Airflow pattern

Proper air distribution helps avoid stagnant areas and excessive temperature variations.

Industrial HVAC Duct Design

Industrial ductwork may need to handle large airflow volumes and higher operating pressures.

Design considerations include:

• Air velocity
• Static pressure
• Pressure losses
• Duct dimensions
• Material selection
• Insulation
• Leakage
• Support systems
• Access for cleaning
• Fire and smoke requirements
• Air balancing

Process-exhaust ductwork should be designed according to the characteristics of the exhaust stream.

Make-Up Air System

When large exhaust systems operate in a manufacturing facility, replacement air may be required.

A make-up air system can provide conditioned or filtered outdoor air to compensate for exhausted air.

Benefits can include:

• Better pressure control
• Improved ventilation
• Reduced uncontrolled infiltration
• Improved worker comfort
• Better exhaust-system performance

Make-up air requirements should be coordinated with the plant’s exhaust system.

Industrial HVAC Controls & BMS

A Building Management System (BMS) can provide centralized monitoring and control of industrial HVAC equipment.

Parameters may include:

• AHU status
• Supply-air temperature
• Return-air temperature
• Room temperature
• Relative humidity
• Fan status
• VFD speed
• Filter differential pressure
• Damper position
• Valve position
• Exhaust-fan status
• Alarm conditions

Process-specific controls can be incorporated where required.

Energy-Efficient HVAC for Manufacturing Plants

Industrial HVAC systems can consume substantial amounts of energy.

Potential energy-efficiency measures include:

VFD Fans

Variable Frequency Drives can adjust fan speed according to airflow requirements.

Efficient AHUs

Proper AHU and fan selection can help reduce unnecessary energy consumption.

Zoning

Separate HVAC zones can allow systems to operate according to actual requirements.

Heat Recovery

Heat-recovery systems can be considered for suitable fresh-air and exhaust applications.

BMS Controls

Automated scheduling and monitoring can help optimize HVAC operation.

Preventive Maintenance

Clean filters, coils and properly maintained fans can help maintain system performance.

Testing & Commissioning

Industrial HVAC systems should be tested and commissioned after installation.

Depending on project requirements, activities can include:

• AHU performance testing
• Airflow measurement
• Supply-air balancing
• Return-air balancing
• Fresh-air measurement
• Exhaust-air measurement
• Temperature verification
• Humidity verification
• Pressure checks
• Fan performance testing
• Control-system verification
• BMS testing

Proper commissioning helps verify that the installed system performs according to the approved design.

Industrial HVAC Maintenance

Preventive maintenance is important for reliable manufacturing plant operation.

Maintenance activities can include:

• AHU inspection
• Filter cleaning/replacement
• Cooling-coil cleaning
• Condensate-drain inspection
• Fan inspection
• Motor inspection
• Belt inspection
• Bearing inspection
• Damper inspection
• Sensor calibration
• VFD inspection
• Exhaust-fan inspection
• Duct inspection
• BMS checks

Maintenance schedules should be developed according to equipment, operating conditions and the manufacturing process.

Why Choose Vipul HVAC Solution Pvt Ltd?

Vipul HVAC Solution Pvt Ltd provides industrial HVAC engineering and contracting solutions for manufacturing plants, factories, warehouses and specialized industrial facilities.

Our Industrial HVAC Capabilities

• Manufacturing plant AHU systems
• Industrial HVAC design
• Industrial ventilation
• Factory air conditioning
• Fresh-air systems
• Process ventilation
• Exhaust systems
• Make-up air systems
• Dust and fume extraction solutions
• Chilled-water HVAC systems
• VRF/VRV solutions
• Industrial ducting
• AHU installation
• HVAC controls
• BMS integration
• Air balancing
• Testing and commissioning
• HVAC maintenance and AMC

Integrated Industrial HVAC Approach

We evaluate the complete system:

Process Load + Cooling Load + AHU + Fresh Air + Exhaust + Filtration + Ductwork + Air Distribution + Controls

This approach helps develop an HVAC and ventilation system based on the actual requirements of the manufacturing facility.

Our Manufacturing Plant HVAC Project Process

1. Site Assessment

We evaluate the plant layout, production process, equipment and existing HVAC infrastructure.

2. Process & Load Assessment

We identify heat-generating equipment, occupancy, ventilation requirements and environmental conditions.

3. Cooling Load Calculation

Cooling loads are calculated according to the building and process requirements.

4. Ventilation Design

Fresh-air, exhaust and make-up-air requirements are established.

5. AHU Selection

AHU airflow, cooling capacity, static pressure, filtration and fan requirements are evaluated.

6. Duct & Air Distribution Design

Supply, return, fresh-air and exhaust ductwork is designed according to airflow requirements.

7. Installation

AHUs, ducts, piping, ventilation equipment, controls and related HVAC systems are installed.

8. Testing & Commissioning

The system is balanced, tested and commissioned according to the approved project requirements.

Benefits of a Properly Designed Manufacturing Plant AHU

A properly engineered industrial HVAC system can help provide:

• Better worker comfort
• Controlled temperature
• Appropriate ventilation
• Improved indoor-air-quality management
• Effective heat removal
• Suitable humidity control
• Better air distribution
• Process-supporting environmental conditions
• Efficient equipment operation
• Centralized monitoring
• Easier maintenance

Actual performance depends on correct design, equipment selection, installation, balancing, operation and maintenance.