We can supply three types of Air to Air Heat Exchangers:

• Aluminium Air to Air Plate Heat Exchangers
• Thermal Wheels
• High Temperature Air to Air Heat Exchangers

Aluminium Air to Air Plate Heat Exchangers

Air to Air Plate Heat Exchangers, or Air Plates as they are also known, are an extremely effective and low-cost way of reducing the heating or cooling loads on the treatment of process air and air conditioning systems.

A reduced heating or cooling load means lower energy bills and carbon emissions.

Air Plates use the exhaust air to pre-heat or pre-cool the incoming supply air, without the two air streams ever mixing. The box-like construction of the heat exchanger is supplied with flanges that can be drilled though for connecting to adjacent ductwork.

Applications:

• Heat recovery from exhaust air for space heating for factories, offices and warehouses.
• Pre-cooling of incoming air for air-conditioning units using exhaust cool air.
• De-humidification or humidification of air streams.
• Electrical equipment cooling.

Efficiency

Energy recovery can be as high as 80 - 90%, depending upon operating conditions.

Plate Types

Corrugated plate surfaces, for high efficiency and energy recovery. Smooth surface plates that can be easily cleaned for dirty air streams.

Materials

Aluminium - non-corrosive air streams. Max. temperature 200°C. Epoxy coated aluminium - adds protection to the aluminium for air streams containing salts etc.

Thermal Wheels

Thermal Wheels are installed across hot and cold air ducts. As the Thermal Wheel rotates, the extended surface is heated by the hot air stream. When the rotation passes through the cold air duct, the wheel cools down, thereby transferring heat.

The following sizes are available:

Residential		Diameter 200 mm to 1000 mm		Air flows up to 2,000 m³/hr
One Piece		Diameter 500 mm to 2500 mm		Air flows up to 50,000 m³/hr
Segmented		Diameter 1200 to 3800 mm		Air flows up to 120,000 m³/hr

Applications

• Heat recovery
• De-humidification of air streams

Efficiency

Materials

• Aluminium
• Epoxy coated aluminium
• Aluminium with Hygroscopic surface

High Temperature Air To Air Heat Exchangers

(a) Aluminium Plate Type Exchangers

Applications include:

• Oven Heat Recovery
• Print ovens
• Baking Ovens
• Condensing filtration systems
• Process cooling

Features:

• High temperature Aluminium and Fully Welded
• Max operating temperature of 232°C
• Compact design
• Removable access panels
• Up to 70% Efficiency
• Pressure differentials up to 6" w.c.

(b) Stainless Steel Plate Type Exchangers - Uninsulated

Applications include:

• Oven Heat Recovery
• Combustion Air Pre-heating
• Fume Pre-heating
• Catalytic Oxidisers
• Process air cooling
• Indirect process air heaters
• Thermal oxidisers
• Spray Dryers

Features:

• Various grade stainless steels and exotic alloys available with fully welded design
• Robust construction
• Max operating temperature of 650°C
• Up to 70% Efficiency
• Removable access panels available

(c) Stainless Steel Plate Type Exchangers - Insulated

Features:

• Various grade stainless steels and exotic alloys available with fully welded design
• Robust construction
• Max operating temperature of 650°C
• Removable access panels available

(d) Tubular Exchangers

Applications include:

• Oven Heat Recovery
• Combustion Air Pre-heating
• Fume Pre-heating
• Catalytic Oxidisers
• Process air cooling
• Indirect process air heaters
• Thermal oxidisers

Features:

• Various grade stainless steels and exotic alloys available with fully welded design
• Robust construction
• Max operating temperature of 870°C
• Ideal for dusty / particulate environments as less susceptible to blocking
• More resistance to corrosion than plate design
• Removable access panels available
• Insulation options available
• Design incorporates internal thermal expansion