Industrial Cross Flow Heat Exchangers: Design & Manufacture

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Maximise efficiency in gas-to-gas and gas-to-liquid heat recovery. Graham Hart Process Technology engineers bespoke cross flow solutions designed for high-performance stack gas recovery, waste heat utilisation, and process fluid heating.

Graham Hart Process Technology specialises in the thermal and mechanical design of Cross Flow Heat Exchangers. By directing fluid streams perpendicular to one another, these units achieve high heat transfer coefficients with a lower pressure drop than standard shell and tube designs. They are the industry-leading choice for recovering energy from industrial flue gases, preheating combustion air, and managing temperature-sensitive process gases.

What is a Cross Flow Heat Exchanger?

A cross flow heat exchanger is a device where two fluid streams flow at right angles (perpendicular) to each other. Typically, a hot gas flows over the exterior of a tube bundle while a coolant—either liquid or gas—passes through the tubes. This arrangement is specifically engineered to provide effective heat exchange while minimising the resistance (pressure drop) encountered by the moving gas.

When should you use Cross Flow over Shell and Tube?

Cross flow designs are preferred for applications involving large volumes of gas where maintaining a low pressure drop is critical, such as stack gas heat recovery. Unlike traditional shell and tube units that may require complex baffling, the cross flow arrangement allows gas to move more freely over the tube surface, making it ideal for waste heat recovery units (WHRU) and combustion air preheaters.

Technical Capabilities & Specifications

Feature	Specification / Capability
Primary Applications	Stack gas recovery, WHRU, combustion air preheating
Flow Arrangements	Single-pass cross flow or counter-current cross flow (multi-pass)
Temperature Range	High-temperature flue gas recovery to cryogenic vaporisation
Fluid Types	Gas-to-gas, gas-to-liquid, and vaporising/condensing duties
Design Codes	PD 5500, EN 13445, ASME VIII
Material Options	Carbon Steel, Corrosion-resistant alloys, stainless steels, and exotic materials

The Graham Hart Process Technology Difference

Recovering heat from industrial exhaust is often a battle against two forces: pressure drop and the dew point. If the pressure drop is too high, you require expensive blowers to move the gas; if the temperature drops too low, acidic condensation can destroy the unit.

At Graham Hart Process Technology, we solve these challenges through precise thermal modelling using our in-house software. We don't just build a box with tubes; we engineer the "Why." Our designs ensure that metal temperatures remain safely above the dew point to prevent corrosion, while the tube layout is optimised to capture maximum energy with minimal impact on your flue's natural convection. Whether you are preheating vegetable oils in the food industry or vaporising gases in a chemical plant, we balance efficiency with operational longevity.

Frequently Asked Questions

What is the maximum efficiency of a cross flow heat exchanger?

In a counter-current cross flow configuration, efficiency can theoretically approach 100%. However, in practical industrial applications, Graham Hart Process Technology optimises the design to balance thermal recovery against the physical size and cost of the unit, typically aiming for the most economic point of diminishing returns.

Can cross flow heat exchangers handle acidic flue gases?

Yes. By using advanced materials and carefully controlling the coolant flow, Graham Hart Process Technology ensures the internal tube surfaces stay above the acid dew point. For highly aggressive environments, we utilise corrosion-resistant alloys and bespoke mechanical designs to prevent premature failure.

Does a cross flow heat exchanger need a blower?

This depends on the system's "natural draught." Since cooling a gas reduces its buoyancy, a blower may be required to maintain flow. Graham Hart Process Technology provides technical guidance during the planning phase to determine if a fan or blower is necessary for your specific installation.

Enquire About Heat Recovery Solutions

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