Heat Exchangers

Block Type Heat Exchangers

A block type heat exchanger is a customized heat transfer unit where tubes, plates, or coils are enclosed within a rectangular or square block-shaped casing. The design provides flexibility to handle multiple fluid streams, large flow volumes, and non-standard layouts, making it suitable for specialized process requirements.

Key Benefits Include:

• Design flexibility to accommodate unique process conditions
• Compact and robust construction for efficient use of space
• High versatility with options for air, liquid, or gas cooling/heating
• Ease of integration with existing process systems and ducts

Shell & Tube Heat Exchangers

The shell & tube heat exchanger is the most widely used and time-tested heat exchanger design. It consists of a bundle of tubes enclosed within a cylindrical shell, with one fluid flowing inside the tubes and another fluid around them. The robust construction makes it suitable for a wide range of pressures, temperatures, and applications.

Key Benefits Include:

• High durability and reliability for continuous, heavy-duty operations
• Versatile design adaptable to condensation, evaporation, and heat recovery duties
• Handles extreme conditions with high pressure and temperature capabilities
• Ease of cleaning and maintenance through removable tube bundles

Plate Heat Exchangers (PHE)

A plate heat exchanger consists of multiple thin, corrugated plates stacked together to create separate flow channels for hot and cold fluids. The large surface area and turbulent flow patterns deliver highly efficient heat transfer in a compact unit.

Key Benefits Include:

• Excellent thermal efficiency due to large surface area and counter-current flow
• Compact and space-saving compared to shell-and-tube exchangers
• Flexible capacity -- easy to add or remove plates as process demands change
• Cost-effective with lower material usage for the same duty

Shell & Plate Heat Exchanger

A shell & plate heat exchanger combines the robustness of a shell-and-tube design with the efficiency of plate technology. It consists of a fully welded plate pack inserted into a cylindrical shell, creating a compact, leak-tight unit capable of handling high pressures and temperatures.

Key Benefits Include:

• High thermal efficiency with true counter-current flow
• Compact design with a smaller footprint than traditional shell-and-tube exchangers
• High pressure and temperature resistance due to fully welded construction
• Low maintenance with no gaskets, ensuring reliability in demanding conditions

Finned Tube Heat Exchanger (FTHE)

A finned tube heat exchanger is designed to enhance heat transfer efficiency between fluids, typically between a liquid and air or gas. It consists of tubes with external fins that increase surface area, allowing more effective heat exchange while keeping the unit compact.

Key Benefits Include:

• High heat transfer efficiency due to extended finned surface
• Compact and lightweight design compared to bare tube exchangers
• Versatile operation for heating, cooling, or condensing applications
• Cost-effective with reduced material requirement for the same duty

Spiral Heat Exchanger (SHE)

A spiral heat exchanger is a highly efficient, compact device designed for handling challenging heat transfer applications involving liquids, gases, vapors, or slurries. Constructed from two metal plates wound into a spiral coil, the design creates single, continuous flow paths for each fluid, ensuring high turbulence and minimal fouling.

Key Benefits Include:

• High thermal efficiency due to true counter-current flow
• Compact design with a small footprint compared to shell-and-tube exchangers
• Excellent fouling resistance as the spiral channels promote self-cleaning
• Versatility in handling dirty, viscous, or particle-laden fluids

Energy Recovery Economisers

Grevia provides modular, flexible, and economical economiser solutions that serve as waste heat recovery systems. These heat exchangers transfer waste heat from exhaust gas streams to incoming air or water, significantly improving system efficiency.

Key Benefits Include:

• Modular design for flexible installation options
• Available in carbon steel and stainless steel materials
• Various tube types to match specific process parameters
• Multi-stage dry/wet systems capability
• Customizable configurations for diverse applications
• Efficient heat transfer technology
• Robust construction for long-term reliability

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