Air to Air Heat Exchangers

Air to Air Heat Exchangers

Plate Type

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What do they do?:

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 through for connecting to adjacent ductwork or are suitable to be slid into an enclosure.

Applications:

  • Pre-heating/cooling of incoming air for air-conditioning units using exhaust warm/cool air.
  • De-humidification of air streams.
  • Electrical equipment cooling.
  • Drying rooms / kilns heat recycle.
  • Oven Heat Recovery.
  • Combustion Air Pre-heating.
  • Catalytic Oxidisers.
  • Process air cooling.
  • Indirect process air heaters.
  • Thermal oxidisers.
  • Spray Dryers

As an option, we can supply heat exchangers fitted in our enclosures as complete heat recovery units.

Energy recovery typically 50 - 85%, depending upon operating conditions.

Plate Types:

  • Corrugated plate surface types, for high efficiency and energy recovery.
  • Smooth surface plate types that can be easily cleaned for dirty air streams.
  • Cross-flow models for good efficiency (typical 50-75%) with low pressure drops.
  • Counter-flow type for high efficiency (typical 75-85%).

Materials:

  • Aluminium with non-silicone adhesive - max 90°c.
  • Aluminium with silicone adhesive - max 200°c.
  • Epoxy coated aluminium (adds protection to the aluminium for air streams containing salts / chlorine) - max 200°c.
  • Stainless steel with silicone adhesive - max 250°c.
  • Stainless steel with fully welded frame (no adhesive and 100% air tight) - max 650°c - Extremely robust for industrial process applications

Thermal Wheel Type

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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.

Size Range:

  • Diameter 500 mm to 3800 mm
  • Air flows up to 120,000 m³/hr

Applications include:

  • Heat recovery
  • Air Handling Units
  • De-humidification of air streams

Features:

  • Higher efficiency than air plates for the amount of space they take up
  • Take up less space than air plates - particularly for very large air flows
  • Max operating temperature of 60°C
  • Up to 90% Efficiency depending on operating conditions
  • Removable access panels available

Rotor Materials:

  • Aluminium
  • Epoxy coated aluminium
  • Aluminium with Hygroscopic surface

Tubular Type

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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