Plate Heat Exchangers

Plate heat exchangers provide efficient heating, cooling and heat recovery by transferring thermal energy between fluids through a series of thin metal plates.

Also known as PHEs, plate heat exchangers combine a large heat-transfer area with a compact footprint and are widely used across food and beverage, dairy, pharmaceutical, chemical, industrial, marine and utility processes.

AxFlow UK supplies APV plate heat exchangers, including gasketed, brazed and specialist welded configurations, and can help determine the appropriate plate pattern, materials, gaskets and thermal design for the process duty.

What is a plate heat exchanger?

A plate heat exchanger transfers heat between two fluids through a series of thin heat-transfer plates.

The hot and cold fluids pass through separate channels on opposite sides of each plate. Heat travels through the plate from the hotter fluid into the colder fluid while the two process streams remain separated.

Corrugated plate patterns create a large surface area and promote turbulence, enabling high heat-transfer performance within a relatively compact unit.

How does a plate heat exchanger work?

A typical plate heat exchanger works in four stages:

1. Hot and cold fluids enter through separate connections.
2. The plate arrangement distributes the fluids into alternating channels.
3. Heat passes through the metal plates from the hotter fluid to the colder fluid.
4. The fluids leave through separate outlets at their new temperatures.

Many duties use counter-current flow, where the fluids travel in opposite directions.

This maintains a useful temperature difference along the exchanger and can allow close temperature approaches and effective heat recovery.

Why choose a plate heat exchanger?

Plate heat exchangers are commonly selected because they can offer:

• High heat-transfer efficiency
• Compact footprint
• Close temperature approach
• Low fluid hold-up
• Effective heat recovery
• Flexible plate and channel configurations
• Multiple material and gasket options
• Good hygienic configurations
• Relatively low equipment weight
• Expandable capacity on many gasketed designs
• Access for inspection on gasketed units

Their greatest advantage is the ability to provide high thermal performance from a relatively small heat-transfer surface package.

Where can Plate heat exchangers be used:

• Chemical Processing: In various chemical processes, plate heat exchangers play a crucial role in heating, cooling, and condensing fluids, contributing to process efficiency and energy savings.

• Food and Beverage Industry: Plate heat exchangers are used for pasteurization, heating, and cooling applications in the food and beverage production, preserving product quality and safety.

• Marine industry: Plate heat exchangers are employed in marine vessels for various cooling and heating purposes, including engine cooling, HVAC, and desalination.

• Oil and Gas Industry: Plate heat exchangers are used in the oil and gas sector for various processes, such as crude oil cooling, natural gas processing, and heat recovery.

• Pharmaceutical Industry: Plate heat exchangers are utilized for heating and cooling in pharmaceutical manufacturing processes, where precise temperature control is critical.

When should you select a plate heat exchanger?

A plate heat exchanger should be strongly considered when:

High thermal efficiency is important: Thin plates and turbulent channels can provide high heat-transfer coefficients.

Plant space is limited: Plate exchangers can provide substantial heat-transfer area in a compact footprint.

A close temperature approach is required: Plate technology can perform particularly well where the outlet temperature of one stream needs to approach the inlet temperature of the other.

Heat recovery is important: Their thermal performance makes plate exchangers highly suitable for transferring energy between process streams.

The product is sufficiently free flowing: Clean and low-to-medium viscosity fluids are particularly well suited to conventional plate channels.

Future capacity may change: Many gasketed units can be reconfigured by changing the number or arrangement of plates.

Access for cleaning is required: A gasketed plate pack can normally be opened for inspection and mechanical cleaning.

Benefits of using Plate heat exchangers:

1. Efficient Heat Transfer: Plate heat exchangers are highly efficient in transferring heat between two fluids due to their design. The thin metal plates create a large surface area, allowing for more effective heat exchange. The corrugated patterns on the plates promote turbulence, further enhancing heat transfer rates. As a result, plate heat exchangers require less energy to achieve the desired temperature changes, leading to cost savings and reduced environmental impact.

2. Compact Design: Plate heat exchangers have a compact and space-saving design compared to traditional shell-and-tube heat exchangers. The stacked plate arrangement provides a high surface area-to-volume ratio, making them ideal for applications with limited space. The compactness also contributes to faster startup times, as the unit reaches the required operating temperature quickly.

3. Easy Maintenance and Cleaning: Plate heat exchangers are designed for easy disassembly, making maintenance and cleaning straightforward. The smooth surfaces of the plates reduce the risk of fouling and scaling, but when needed, the plates can be removed and cleaned with relative ease. This feature ensures better system performance and prolongs the heat exchanger's lifespan, reducing downtime and maintenance costs.

Why buy plate heat exchnagers from axflow

AxFlow supply APV plate heat exchangers, APV plate heat exchangers are designed with advanced technology and optimized plate patterns to maximize heat transfer efficiency. Aswell as this APV Plate heat exchangers are available in various plate types, sizes and configurations, thus making them highly versatile and suitable for a range of applications.