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Air handling units
(AHUs)

  1. Home

Air handling units (AHUs)

Outstanding indoor air quality is the prerequisite for our daily well-being and health.

The AHU is the centrepiece of mechanical ventilation. It assumes essential functions such as

  • Conveyance of suitable quantities of fresh outdoor air
  • Filtering of harmful substances and particles from outdoor air
  • Conditioning of the supply air with respect to temperature and humidity
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  • Application overview
  • Functions and field devices
Application overview

Energy-efficient solutions are also required in technical building services to achieve the climate targets set by the European Commission regarding the reduction of carbon emissions (European Green Deal). Efficient operation of AHUs contributes significantly to these set goals.

Learn about why AHUs are the energy-efficient backbone for our comfort and health:
 

Health, comfort and energy efficiency

Air handling units (AHUs)

The following documentation is dedicated to the application of AHUs and aims to explain it in a simple and holistic way and thus to communicate application knowledge. In this documentation, the design and functions of an AHU are explained and the benefits and disadvantages of different design strategies are discussed. Special reference is made to the use and arrangement of field devices.

 

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Table of contents

  1. Introduction
     
  2. Basics of air conditioning
    → Comfort and health
    → Air-conditioning processes
     
  3. AHUs and components
    → System types and structural shapes
    → Components
     
  4. Building automation
    → Levels of a building automation system
    → Building automation with focus on AHUs
     
  5. Control of AHUs
    → Overview of control devices and functionality
    → Control and regulation of an AHU

 

Download Links

 


Example from Chapter 5 with respect to the control of AHUs
 

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Fields of application

The requirements for an AHU depend on the application for which the device is needed. The following applications can be distinguished based on their properties (non-exhaustive list):

Appli_IMG_THM_Office

Offices, schools and meeting rooms

 

Discharge of air pollution caused by people and partly by internal heat loads. Supply of conditioned replacement air.

Appli_Flughafen

Airports and exhibition halls

 

High volumetric flow rates for discharge of heat loads.

Appli_museum

Museums and art galleries

 

Constant room conditions --> small temperature and humidity ranges for protection against premature aging.

Appli_Dataserver

Data centres

 

Reduction of cooling loads with minimum outdoor air and maximum recirculated air. Use of adiabatic cooling with highly efficient energy recovery. Concepts using free cooling possible.

Appli_Schwimmbad

Swimming bath

 

Reduction of air humidity for increased comfort and protection against moisture damage.

Appli_Schifffahrt

Shipping

 

Supply of fresh air to increase comfort and reduce humidity to protect against moisture damage. Systems must be corrosion-resistant.

Appli_Labor

Hospital and laboratory

 

Constant temperature and humidity values. Low fine dust concentration. Systems must meet the highest hygienic standards.

Appli_Pharma

Pharmaceutical and chemical industry

 

Defined clean room conditions with partly high demands on room air temperature and humidity.

Apply_Industrie

General industry with higher demands

 

Defined climatic conditions for constant production quality without interrupting operations.

Functions and field devices

Field devices such as damper actuators, combination valves/actuators, and sensors are required to control and regulate an AHU's various functions.

Learn about the interactions of field devices and functions and discover more detailed information on these subjects:

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