Heat Exchanger Food Processing: Plate, Tubular & Scraped Surface Guide
Introduction
Imagine trying to pasteurise milk without a heat exchanger. You would have to heat giant vats and hope the temperature was right. You would waste huge amounts of energy. And you would struggle to cool the product quickly enough.
Thankfully, we don't work that way anymore.
A heat exchanger food system is the unsung hero of every dairy and food processing plant. It transfers heat between fluids without mixing them. This allows precise temperature control for pasteurisation, UHT treatment, cooling, and heat recovery.
In this guide, we'll explore the four main types of heat exchangers used in food processing. You'll learn which type suits your product, how to choose the right one, and why the plate heat exchanger dairy processing system is the most common choice for fluid products.
What Is a Heat Exchanger Food Processing System?
A heat exchanger food system transfers thermal energy between two or more fluids. One fluid gets hotter. The other gets cooler. They never mix.
Why Food Processing Needs Heat Exchangers
| Application | Purpose |
|---|---|
| Pasteurisation | Kills pathogens, extends shelf life |
| UHT treatment | Creates shelf-stable products |
| Cooling | Prepares products for packaging |
| Heating | Cooking, melting, dissolving |
| Heat recovery | Saves energy, reduces costs |
The Evolution of Heat Exchanger Technology
Heat exchanger technology has come a long way from the simple tube-in-tube designs of the early 1900s. Today, advanced plate heat exchanger dairy processing systems can recover over 95% of thermal energy. The global heat exchanger market, valued at USD 17.6 billion in 2024, is expected to grow to USD 27.7 billion by 2032, driven by demand for energy efficiency and expanding food and beverage industries.
Type 1: Gasketed Plate Heat Exchanger
Best for: Low-viscosity liquids like milk, juice, and beer.
How It Works
Corrugated stainless steel plates with gaskets create separate channels. Hot and cold fluids flow on alternate sides of the plates. Gaskets direct the flow and prevent mixing.
Key Advantages
High thermal efficiency: Up to 95% heat recovery possible
Compact footprint: Saves valuable floor space
Easy cleaning: Plates can be opened, inspected, and cleaned
Modular design: Add or remove plates to change capacity
Low hold-up volume: Less product trapped during changeovers
Environmentally efficient: Lower energy and water usage
Wide-Gap Plates for Challenging Products
Special wide-gap gasketed plate heat exchanger dairy processing units are designed for:
Fluids containing fibres or coarse particles
Viscous fluids that would clog standard plates
Gemak Partnership
Gemak has partnered with industry leader Alfa Laval to supply gasketed plate heat exchangers. This ensures world-class quality and performance.
Type 2: Brazed Plate Heat Exchanger
Best for: Hot water preparation systems, pasteurisation support, space-constrained installations.
How It Works
Stainless steel plates are brazed together with copper. No gaskets. The brazing material creates a permanent, leak-proof seal. The result is a self-contained unit.
Key Advantages
Extremely small footprint: Fits where others won't
Handles high pressures: Suitable for demanding applications
Handles high temperatures: No gaskets to fail
No gasket replacement: Lower maintenance
High efficiency: All surfaces actively transfer heat
Typical Applications
Hot water preparation for pasteurisers
Condensation
Evaporation
Heat recovery loops
Gemak Partnership
Like gasketed plate units, Gemak supplies brazed plate heat exchangers through their partnership with Alfa Laval.
Type 3: Scraped Surface Heat Exchanger
Best for: Viscous, sticky, or crystallising products that foul standard heat exchangers.
How It Works
A rotating shaft with scraping blades continuously removes product from the heat transfer surface. This prevents fouling and maintains heat transfer efficiency.
Key Advantages
Handles high-viscosity products: Up to very thick fluids
Processes products with particles: No clogging
Prevents burn-on: Protects product quality
Continuous operation: No stopping to clean
Custom alloys: Different materials for different products
Typical Applications
Ice cream and dessert mixes
Butter and margarine
Cheese sauce
Tomato paste and concentrates
Products that change state when heated (e.g., crystallising)
Gemak Manufacturing
Gemak manufactures scraped surface heat exchanger food systems in-house. They use different range alloys and treatment levels depending on the application, product, food safety requirements, wear, and chemical corrosion.
Industries Served
Dairy
Food
Chemical
Pharma
Type 4: Tube-in-Tube (Tubular) Heat Exchanger
Best for: High-viscosity products, products with particles, UHT treatment.
How It Works
Product flows through an inner tube. Heating or cooling media flows through the outer annulus (the space between the inner tube and outer shell).
Available as:
Single-core: One inner tube within an outer shell
Multi-core: Multiple inner tubes within an outer shell for higher capacity
Key Advantages
Robust design: Handles high pressure
High particle capacity: No clogging from chunks or fibres
Easy maintenance: Can be mechanically cleaned
Suitable for UHT treatment: High-temperature capability
Floating design: Accommodates thermal expansion
Typical Applications
UHT milk and cream
Viscous sauces and purees
Fruit preparations with pieces
Whey concentration
High-temperature applications
Gemak Manufacturing
Gemak manufactures tube-in-tube heat exchangers in-house. Their designs allow efficient and easy inline cleaning as well as mechanical cleaning with floating types.
Comparison: Which Heat Exchanger Food Type Is Right for You?
| Type | Best For | Viscosity | Particles | Cleaning | Footprint |
|---|---|---|---|---|---|
| Gasketed Plate | Low viscosity liquids | Low | No | Easy (openable) | Small |
| Brazed Plate | Hot water, pasteurisation | Low | No | Not openable | Very small |
| Scraped Surface | Viscous, sticky | High | Yes | In-place | Medium |
| Tube-in-Tube | High viscosity, particles | High | Yes | Mechanical or CIP | Medium-Large |
Decision Factors
| Factor | Consideration |
|---|---|
| Viscosity | Low → plate. High → scraped or tubular. |
| Particles | Present → tubular, wide-gap plate, or scraped. |
| Fouling tendency | High → scraped surface. |
| Cleaning frequency | Frequent → gasketed plate (easy to open). |
| Space available | Limited → brazed plate (smallest footprint). |
| Pressure requirement | High → brazed plate or tubular. |
| Temperature requirement | Very high → tubular. |
The Heart of Dairy: Plate Heat Exchanger Dairy Processing
A plate heat exchanger dairy processing system is the most common type for fluid dairy products. Here's why it's so popular.
Typical Dairy Applications for Plate Heat Exchangers
Milk pasteurisation
Cream heating and cooling
Yogurt base processing
Ice cream mix treatment
Whey pasteurisation
Juice pasteurisation
Regenerative Heating – The Key to Energy Efficiency
Most plate heat exchanger dairy processing systems include a regeneration section. This captures heat from the outgoing pasteurised product and uses it to pre-heat the incoming raw product.
Result: 90-95% heat recovery. Dramatically lower energy bills.
Why Dairy Plants Choose Plate Heat Exchangers
| Advantage | Why It Matters for Dairy |
|---|---|
| High thermal efficiency | Lower energy bills, faster processing |
| Tight temperature control | Consistent pasteurisation, better quality |
| Compact design | Fits in space-constrained facilities |
| Easy plate addition/removal | Adjust capacity as your plant grows |
| Full drainability | No product trapped, no bacteria harbourage |
| Easy cleaning | Plates can be opened and inspected |
Hygienic Design for Food Heat Exchangers
Food safety is non-negotiable. Your heat exchanger must be designed for cleanability.
Key Hygienic Design Features
No dead legs: Length-to-diameter ratio < 1.5
Smooth surfaces: Polished to food-grade standards
Full drainability: No trapped product
CIP compatibility: Can be cleaned without disassembly
Sanitary connections: Tri-clamp, not threaded
Standards to Look For
EHEDG: European Hygienic Engineering & Design Group
3-A Sanitary Standards: Widely recognised for dairy equipment
Cleaning Considerations by Type
| Type | Cleaning Method |
|---|---|
| Gasketed plate | CIP or open for manual inspection |
| Brazed plate | CIP only (cannot be opened) |
| Scraped surface | CIP with scrapers assisting |
| Tube-in-tube | CIP or mechanical cleaning |
Why Heat Recovery Matters
Energy costs are a major expense for food and dairy plants. A well-designed heat exchanger food system with regeneration can recover 90-95% of thermal energy.
How Heat Recovery Works
Raw cold product enters.
It passes through one side of the regeneration section.
Pasteurised hot product passes through the other side.
Heat transfers from the hot pasteurised product to the cold raw product.
The raw product is pre-heated. The pasteurised product is pre-cooled.
Benefits of High Heat Recovery
Lower energy bills: Up to 95% less heating/cooling energy
Reduced carbon footprint: Supports net-zero targets
Smaller utility equipment: Lower capital costs
Faster processing: Product reaches temperature sooner
Why Gemak Is the Right Choice for Your Heat Exchanger Needs
Gemak has over 40 years of industry heritage and 15 years of dedicated UK operations. They offer all four heat exchanger types, allowing unbiased recommendations.
Our Heat Exchanger Range
| Type | Brand/Manufacturing | Key Feature |
|---|---|---|
| Gasketed Plate | Alfa Laval partnership | Industry leader, high efficiency |
| Brazed Plate | Alfa Laval partnership | Compact, high pressure/temperature |
| Scraped Surface | Gemak manufactured | For viscous, sticky products |
| Tube-in-Tube | Gemak manufactured | High particle capacity, robust |
Our Promise
In-house expertise: We design, specify, and integrate all types.
Unbiased advice: We recommend what fits your product, not our inventory.
Energy efficiency: All designs optimise heat recovery (up to 95%).
UK-based support: Local service, genuine spares, fast response.
Our UK Track Record
Gemak has delivered heat exchanger food solutions for leading UK brands, including:
Wensleydale Cheese: 15,000 lph processing plant
South Caernarfon Creameries: Project Dragon whey facility
Meadow Foods: Plant-based yoghurt line
Conclusion
A heat exchanger food system is a critical investment for any food or dairy plant. The right choice delivers:
Lower energy bills (up to 95% heat recovery)
Consistent product quality
Less downtime (easy cleaning, less fouling)
Easier compliance (hygienic design standards)
A plate heat exchanger dairy processing system is ideal for low-viscosity fluids like milk, whey, and juice. But for viscous products, products with particles, or high-temperature applications, other types may be better.
Use the comparison tables in this guide to evaluate your options. Match the heat exchanger type to your product viscosity, particle content, fouling tendency, and cleaning needs.
Then, work with a partner who offers all four types and can guide you to the right solution.
Ready to find the right heat exchanger for your plant?
👉 Visit Gemak's Heat Exchangers Page to discuss your requirements.
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