Blast Freezer Room and Blast Freezing Tunnel A blast freezer room and blast freezing tunnel are industrial refrigeration systems designed to rapidly cool or freeze food products. They are widely used in meat processing plants, poultry facilities, fish and seafood processing plants, frozen food factories, bakeries, catering facilities and industrial food production plants. Unlike a conventional cold room, a blast freezer is designed to remove heat from products as quickly as possible. The refrigeration capacity, evaporator, fans, insulation and air circulation system are specifically designed according to the product and required freezing process. What Is a Blast Freezer Room? A blast freezer room is a specially designed insulated room equipped with a high-capacity refrigeration system. It is used to rapidly reduce the temperature of products before they are transferred to a frozen storage room. Blast freezer rooms can be designed for meat, poultry, fish, seafood, vegetables, fruits, bakery products, prepared meals and other food products. What Is a Blast Freezing Tunnel? A blast freezing tunnel is an industrial freezing system in which products pass through a controlled environment with high-velocity cold air. Depending on the production process, products can be transported through the tunnel using conveyor belts, trays, racks, carts or pallet systems. Blast freezing tunnels are particularly suitable for high-capacity production facilities where continuous or semi-continuous freezing is required. Blast Freezer vs. Standard Cold Room Feature Standard Cold Room Blast Freezer Room Main purpose Product storage and temperature maintenance Rapid cooling or freezing Refrigeration capacity Standard High Air circulation Standard High air volume and velocity Evaporator Standard capacity High-capacity evaporator Fans Standard fans High-airflow fans Process Long-term storage Rapid temperature reduction Main Components of a Blast Freezer Room 1. Insulated Cold Room Panels The walls and ceiling of a blast freezer room require high-performance insulated sandwich panels. Depending on the project, polyurethane (PU), PIR or polystyrene insulation can be considered. Panel thickness should be determined according to operating temperature, room dimensions, ambient conditions, energy efficiency requirements and project specifications. 2. Blast Freezer Door Door insulation and airtightness are extremely important in low temperature refrigeration applications. Depending on the application, the system may use: Sliding cold room doors Hinged cold room doors Freezer doors High-speed industrial doors Special insulated industrial doors 3. Evaporator The evaporator is one of the most important components of a blast freezing system. It transfers heat from the room and products into the refrigeration system. Evaporator capacity should not be selected based only on room volume. Product quantity, inlet temperature, target temperature, freezing time, product characteristics and required airflow must also be considered. 4. Compressor Compressor technology is selected according to the required refrigeration capacity and operating conditions. Hermetic compressors Semi-hermetic compressors Scroll compressors Screw compressors Multiple compressor systems Central rack refrigeration systems 5. Condenser The condenser rejects the heat absorbed by the refrigeration system to the surrounding environment. Condenser capacity must be selected according to compressor capacity and actual operating conditions. The Importance of High Airflow One of the main differences between a standard cold room and a blast freezer is the high level of air circulation. High-airflow evaporator fans circulate cold air over the products, increasing heat transfer and helping to reduce product temperature more rapidly. However, higher airflow is not automatically better for every product. Excessive airflow may cause surface drying, weight loss or product quality problems. Air velocity should therefore be designed according to the characteristics of the product. Factors Affecting Blast Freezing Time Type of product Quantity of product Product inlet temperature Target product core temperature Product thickness Packaging type Product arrangement Air velocity Evaporator capacity Compressor capacity Insulation performance Required freezing time Why Product Core Temperature Is Important Monitoring room temperature alone is not sufficient during blast freezing. The core temperature of the product is one of the most important parameters for evaluating the freezing process. The room may reach a very low temperature while the center of the product remains significantly warmer. For professional applications, product temperature can be measured at different points to monitor the freezing process. Blast Freezing for Meat Products Blast freezing systems can be designed for beef, lamb, poultry, turkey, offal and packaged meat products. The system design should consider product inlet temperature, product weight, thickness, packaging, hanging or rack storage, daily production capacity and required core temperature. Blast Freezing for Fish and Seafood Rapid temperature control is particularly important in fish and seafood processing. Blast freezing systems can be designed for fish, shrimp, squid, mussels, fillets and other seafood products. Product size, thickness, packaging, water content and production capacity all affect the required refrigeration system. Blast Freezing for Fruits and Vegetables Certain fruits and vegetables can be rapidly cooled or frozen using specially designed systems. However, each product has different freezing characteristics. The freezing point, water content, sensitivity, respiration characteristics and packaging must be considered when designing the process. Blast Freezing Tunnel Structure A typical blast freezing tunnel may include: Product loading area Insulated tunnel High-capacity evaporator High-airflow fans Controlled air circulation Product discharge area Frozen product storage room Conveyor Blast Freezing Tunnel High-capacity food processing plants can use conveyor-based blast freezing tunnels. Products are transported continuously through the freezing tunnel. Conveyor speed can be adjusted according to production requirements. This allows the residence time of products inside the freezing tunnel to be controlled. Blast Freezer Floor Floor insulation and surface materials are also important in blast freezer construction. Depending on the application, insulated floors, reinforced concrete, stainless steel surfaces and hygienic non-slip floor systems can be used. Pressure Relief and Pressure Equalization Low-temperature cold rooms may experience pressure differences. Appropriate pressure equalization systems can help control these pressure differences. A pressure relief valve can also help reduce stress on insulated panels and make door operation easier under suitable conditions. Electrical and Automation System Modern blast freezing systems can be equipped with advanced refrigeration controls and automation systems. Room temperature monitoring Product temperature monitoring Compressor operation Evaporator fan control Defrost control Door status monitoring High and low pressure protection Evaporator temperature monitoring Alarm systems Temperature data logging Remote monitoring options Defrost System Ice can accumulate on evaporator coils during low-temperature operation. An appropriate defrost system is therefore required. Depending on the refrigeration design, defrost may include: Electric defrost Hot gas defrost Other application-specific defrost solutions How Is Blast Freezer Capacity Calculated? Proper engineering calculations are required to determine blast freezer capacity. A simplified calculation considers: Total refrigeration load = Product load + Room load + Air infiltration + Fans + Lighting + Personnel + Other heat loads Product load is determined according to product quantity, inlet temperature, target temperature, specific heat and, when applicable, the latent heat associated with freezing. Information Required for a Blast Freezer Project Room width Room length Room height Daily product capacity Product quantity per batch Product type Product inlet temperature Target product core temperature Required freezing time Packaging type Rack, pallet or hanging system Daily operating hours Number of freezing cycles per day Installation location Ambient temperature Electrical supply Automation requirements Remote monitoring requirements Where Are Blast Freezers Used? Meat processing plants Poultry processing facilities Fish and seafood processing plants Fruit and vegetable processing facilities Frozen food factories Ready-meal factories Bakery production facilities Catering companies Hotels Large restaurants Food logistics centers Cold storage warehouses Food export facilities Blast Freezing and Frozen Product Storage Blast freezing and frozen product storage are two different processes. A blast freezer rapidly reduces product temperature, while a frozen storage room maintains the product at the required storage temperature for an extended period. A typical process can be: Production → Pre-Cooling → Blast Freezing → Frozen Storage → Shipment Advantages of Blast Freezing Systems Rapid product cooling Rapid freezing Improved temperature control Helps preserve product quality Supports cold chain management Suitable for high production capacities Automated temperature control Product temperature monitoring Integration with industrial production lines Important Considerations When Designing a Blast Freezer A blast freezer should not be selected based only on room volume. Product load and required freezing time are critical design parameters. For example, a 100 m³ room processing 500 kg of product per day may require a completely different refrigeration system from a 100 m³ room processing 5,000 kg of product per day. Therefore, professional refrigeration calculations should be performed before selecting the compressor, evaporator and condenser. Blast Freezer Project Design Process A professional blast freezing project can generally be designed using the following sequence: Product → Product Capacity → Inlet Temperature → Target Temperature → Freezing Time → Heat Load → Evaporator → Compressor → Condenser → Automation → Insulation → Door Frequently Asked Questions What is a blast freezer room? A blast freezer room is a high-capacity industrial refrigeration room designed to rapidly reduce the temperature of food products. What is a blast freezing tunnel? A blast freezing tunnel is an industrial system that uses high-velocity cold air to rapidly cool or freeze products as they pass through the tunnel. Is a blast freezer the same as a cold storage room? No. A blast freezer is primarily designed for rapid temperature reduction, while a cold storage room is designed to maintain products at a stable storage temperature. Can blast freezers be designed for different products? Yes. Blast freezer systems can be engineered for meat, poultry, fish, seafood, vegetables, fruits, bakery products and many other food products. How is the correct blast freezer capacity determined? Capacity is determined through refrigeration load calculations based on product quantity, inlet temperature, target core temperature, required freezing time, room dimensions, insulation, airflow and ambient conditions. Conclusion Blast freezer rooms and blast freezing tunnels are important industrial refrigeration solutions for businesses that need rapid cooling or freezing of food products. A properly designed system must consider more than room size. Product characteristics, daily production capacity, product inlet temperature, target core temperature, required freezing time, evaporator capacity, compressor capacity, airflow, insulation and automation should all be evaluated together. Keskinso Industrial Refrigeration Solutions Corporate Contact: +90 537 917 16 95 Website: www.keskinso.com 45 years of manufacturing experience. Keskinso provides industrial refrigeration solutions including blast freezer rooms, blast freezing tunnels, cold rooms, cold storage warehouses and customized refrigeration systems.