Tunnel Air Handling Equipment

Conditioning Tunnel Design

Air Quench Tunnels

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model of production line cooling tunnel with air curtains

We are specialist consultants providing forensic and expert witness support for thermal engineering and design issues.
Dove Thermal Engineering undertakes projects in product development, process improvement and thermal process design.
We design and build a range of heating & cooling equipment, and provide complete balance of plant & process cooling schemes.


Dove Thermal's long experience with conveyor-line drying and air quenching tunnels extends from corn snack manufacture and chocolate enrobing through to engine cylinder block casting and sintered component production. Tunnel sections may be used for raw materials preparation, intermediate stage conditioning and product finishing, and wherever a process is to be contained. A drying tunnel may be fitted either with local bridge-mounted solvent handling and recovery equipment, or ducted to remote systems.


The illustration shows a chilled-air cooling tunnel section with integral entry and exit air curtains to contain the cooled and dehumidified tunnel air mass. These suppress the humid transfer that would otherwise be caused by the vapour pressure gradient between conditioned and ambient air, maintaining a stable and controllable micro-climate in the tunnel section. The design shown also features a proprietary bridge-mounted condensing set, and continuous internal slot nozzles for edge-on air delivery. Assemblies may also be configured for vertical impingement of cooling air onto the conveyor band, or as both a drying and cooling tunnel for product conditioning. While supply temperatures might be less critical for an air quenching tunnel, they generally handle higher throughputs - which might entail provision of noise attenuation equipment.

Process Modelling

Designs are worked-up from mathematical models of the process written to calculate the required changes in product condition, from which to establish the necessary airflows and psychrometry within the controlled space. The model may be prioritized for a drying, heating or cooling tunnel - and service equipment specified accordingly. Various patterns of tunnel arrangement are available to accommodate different types of production, and a preliminary dimensioning and design service is available to determine the essential parameters.

Advanced Fabrication Technologies

We have developed unique self-jigging fabrication methods for the construction of HVACR assemblies, which have been successfully extended to the manufacture of sections for product conditioning tunnels and the construction of air quench tunnels. They exploit recent advances in CIM laser profiling and sheet metal forming to produce precision-built equipment with near off-the-shelf availability.

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Heating and Cooling Design

Dove Thermal Products

Coolant Management Modules; Drying Tunnels
Steam-Heated Calorifiers; Thermal Oil Heaters
Shell-and-Tube Heat Exchangers; HTF Heaters
Thermal Fluid Heaters; HTF-Heated Calandria
Packaged Quench Plants; Air Handling Units
Balance-of-Plant Modules; Cooling Tunnels
Packaged Plant Skid Mounts

Dove Thermal Services

Forensic Engineering; HVRAC Engineering
Thermal Design & Product Development
Consult-Design-Construct Services
Thermal Engineering Consultancy
Process Plant & Process Design
Thermal Fluid Heating Systems
Environmental Systems Design

Dove Thermal Engineering Limited
P.O.Box 5, Uttoxeter, Staffordshire,
ST14 8QX, United Kingdom

Telephone : 01889 569933