For fresh food distribution, pharmaceutical production and food processing enterprises, the preservation of temperature-sensitive products is the core supply chain problem. Cold storage as a professional temperature control facilities, through precise environmental regulation, can effectively maintain the quality of fruits and vegetables, frozen food, medicines, etc., to extend the shelf life. Here we analyze the operation logic of “constant temperature preservation”.
What Is a Cold Storage Facility?
Cold storage is not an ordinary warehouse installed an air conditioning so simple, it is like a super smart refrigerator. It is like a super intelligent refrigerator. It is equipped with professional temperature control equipment, which can stabilize the temperature firmly, no matter how hot or cold the weather is outside, the temperature inside can be maintained at a constant temperature.
Compared with ordinary warehouses, the most significant advantage of cold storage is its precise and stable temperature control ability. Whether you need to maintain the fresh state of fruits and vegetables in the refrigerated preservation, or the requirements of the harsh low-temperature environment of the meat and seafood frozen.
cold storage can be intelligent temperature control system, the temperature will be accurately adjusted to the required range. This extreme control of temperature is a technological advantage that ordinary warehouses can hardly reach.
Core Functions
Temperature is the “lifeline” of perishable products. Fresh fruits and vegetables rot in 3-5 days at room temperature, but after refrigeration, the shelf life is extended to several weeks; vaccines and other pharmaceutical products have stringent temperature requirements, and will be invalid if they are out of range.
The core mission of cold storage is to inhibit bacterial reproduction and slow down product oxidation through stable temperature control, thus maximizing the retention of the original quality of the product, fighting for longer transportation and sales time for the enterprise, and reducing the economic losses caused by deterioration.
Key Industries Relying on Cold Storage
- Food industry: cold storage as the core infrastructure of the modern food industry, for fresh fruits and vegetables, aquatic seafood, processed cooked food and other categories of food to provide constant temperature warehousing security, to ensure that the flow of ingredients in the process of maintaining the freshness and safety quality.
- Pharmaceutical field: the demand in the pharmaceutical field is more stringent, vaccines, biological preparations, targeted prescription drugs and other special drugs, extremely sensitive to temperature fluctuations, cold storage as a whole chain of temperature control of the core hub, once the temperature is out of control, may lead to irreversible public health crises.
- Multi-industry: In addition, the demand for cold chain preservation in the flower industry and the reliance on specific temperature and humidity environments for the storage of chemical raw materials have made cold storage an indispensable infrastructure for the operation of the industry.
Core Components of a Cold Storage Facility
Insulation
The key to maintaining a constant temperature in a cold storage facility is to effectively block the exchange of heat. The walls, ceilings and roofs of cold rooms are usually insulated with specialized low thermal conductivity materials such as sandwich panels and insulated metal panels, which act as solid barriers against the penetration of heat from outside while preventing the loss of cold air inside the room.
If the cold storage is regarded as a well-designed “heat preservation box”, then the heat insulation material is the indispensable “heat preservation layer” of this box. Lack of high-quality thermal insulation materials, even if the refrigeration system performance is excellent, but also due to the external heat constantly invade and consume huge amounts of energy, and even difficult to maintain the established low-temperature environment.
Ground and Door Body Insulation
Ground insulation should not be ignored, laying special PIR insulation boards and using lap installation can prevent moisture from freezing the concrete floor and reduce cold air loss.
Cold storage door is the main cause of cold air loss, frequent opening and closing is easy to cause cold leakage and temperature fluctuation. Therefore, it needs to be made of high-strength heat preservation material, equipped with induction device and sealing tape to reduce the loss of cold. At the same time, regular maintenance is crucial, broken cold storage door will cause icing, condensation and other problems, increasing operating costs.
Ventilation
Ventilation system is the key hub to maintain the stable operation of cold storage. Through the scientifically planned airflow circulation path, it can effectively eliminate temperature blind zones and avoid local temperature differences caused by air stagnation, thus ensuring that the temperature fluctuations in each area of the warehouse are controlled within a very small range and creating a consistent low-temperature storage environment for products.
Humidity Control
Humidity control and temperature management are also the core elements of cold storage. Too high humidity in the warehouse is easy to trigger the growth of microorganisms, resulting in product mold, frost; too low humidity will accelerate the loss of water in fruits and vegetables, resulting in shriveling and shrinkage.
Therefore, it is necessary to equip an intelligent humidity control system to monitor and accurately adjust the air humidity in real time to maintain it in a stable and suitable zone, so that the quality of the products is not disturbed by environmental factors in all aspects.
Energy-saving Lighting
The choice of lighting equipment is especially critical for the 24-hour continuous operation of the cold storage. Energy-saving lighting equipment, such as LEDs, must be used. These lamps and lanterns not only consume less electricity, but also reduce heat generation, avoiding affecting the temperature of the warehouse due to the heat generated by the lighting, and realizing the dual goals of energy-saving and temperature stabilization at the same time as meeting the demand for lighting.
Storage Shelves and Accessories
Space is precious in cold storage, and efficient utilization is the key. Storage racks and shelving systems make full use of vertical space, allowing products to be placed in an orderly manner, making them easy to access and preventing them from being exposed to moisture.
Accessories such as pressure relief valves, mushroom heads, T profiles and PVC sanitary profiles are also essential. The pressure relief valve balances the pressure inside and outside the warehouse, and the PVC hygienic profiles help to clean and disinfect, all of these components work together to ensure the stable operation of the cold room.
How Do Cold Storage Facilities Work?
Thermal Insulation System
Thermal insulation system, as the foundation of cold storage operation, builds up a tightly insulated space by laying high-performance thermal insulation materials on walls, floors and ceilings. Its core role is to significantly reduce the load of the refrigeration system, by effectively blocking the penetration of heat from outside, significantly reducing the operating intensity of refrigeration equipment, to ensure the stability of the cold storage of the internal thermostatic environment.
Authoritative data show that the energy consumption of refrigeration can be reduced by more than 30% by adopting high-quality heat preservation system, which is the key to realize high energy efficiency of cold storage.
Refrigeration System
If the heat preservation system is compared to the “passive heat insulation city wall”, the refrigeration system is the “active cooling center” that controls the temperature.
It relies on the closed-loop cycle mechanism operation: refrigerant (common as liquid ammonia, glycol water solution) in the evaporator to absorb heat gasification, by the compressor pressure and temperature to form a high-temperature and high-pressure gas, and then in the condenser will be released to the outside world, liquefaction cooling back into the evaporator, through this continuous cycle of the realization of the stability of the cold storage temperature regulation and control.
Refrigerant
Refrigerant is called the “blood” of the refrigeration system, commonly used ammonia and ethylene glycol. Ammonia refrigeration efficiency is high, suitable for large-scale cold storage, but toxic and corrosive, need professional protection; glycol safety is good, although slightly lower efficiency.
but more suitable for small and medium-sized cold storage and pharmaceutical cold storage and other high security requirements of the scene, the enterprise according to the size of the cold storage, the storage needs of the flexibility of choice.
Temperature Zoning and Product Storage Optimization
The operation of cold storage relies on temperature zoning to achieve precise temperature control. When planning the layout, independent temperature control zones such as refrigerated area and frozen area will be divided according to the temperature requirements of the products.
When storing products, they are strictly zoned according to temperature requirements, and are placed on pallets and managed in a categorized manner, which not only facilitates access, but also avoids ventilation problems caused by stacking. For example, fresh vegetables are placed in the upper layer of the refrigerated area, and frozen meat is stored in the lower layer of the frozen area, which not only conforms to the law of temperature distribution, but also improves the sorting efficiency.
Additional Considerations for Cold Storage
Real-time Temperature,Humidity Monitoring and Alarming
Even if insulation and refrigeration systems are installed, the environment inside the warehouse needs to be monitored in real time. The temperature and humidity sensors in the cold storage will transmit the collected data to the control center in real time.
Once the environmental parameters are out of the set range, the system will trigger an alarm through SMS, telephone, etc., so that the staff can deal with the abnormality in time to avoid product deterioration.
Emergency Solution
Emergency situations such as power interruption and equipment failure may lead to cold storage temperature control failure. Therefore, regular cold stores are equipped with backup programs, such as redundant refrigeration systems and backup generators.
The redundant refrigeration system can immediately start temperature control when the main refrigeration system fails, and the backup generator can guarantee the operation of the refrigeration and monitoring system during power outages. One food company relied on backup generators to prevent millions of dollars of frozen meat from spoiling during a regional power outage.
Sanitary Protection and Air Circulation
Although the low temperatures inside a cold storage facility are effective in inhibiting the growth and reproduction of most bacteria, it is not a “vacuum” of absolute sterility. Once the hygiene management is slack, microorganisms such as molds and pathogenic bacteria may wait for the opportunity to grow and then contaminate the stored products.
In order to ensure the safety of storage, cold storage through double measures to build a strong health line of defense: one is the regular use of food-grade cleaners, the library floor, shelves, walls for in-depth elimination; the second is the use of continuous operation of the ventilation system to accelerate the air cycle dehumidification, effective inhibition of micro-organisms breeding, to create a clean storage environment.
Security and Access Control
Many cold storage centers store imported seafood, rare medicines and other high-value products, so security and protection should not be underestimated. Cold storage through the fence, monitoring cameras, alarm system to prevent theft and illegal invasion; access control system allows only authorized personnel to enter, and real-time recording of access information, not only to avoid product theft, but also to prevent non-professionals from misuse of temperature control abnormalities caused by the product damage, all-round protection of inventory security.
Types of Cold Storage Facilities
Cold storage
Cold storage (fresh storage) will accurately control the temperature at 2-8 ℃, by inhibiting the respiration of fruits and vegetables and water transpiration, and at the same time slowing down the reproduction rate of microorganisms, to achieve high efficiency of preservation under the premise of maintaining cellular activity.
This temperature range is applicable to the storage of daily vegetables, fruits, dairy products, eggs and other ingredients. Taking boxed milk as an example, its shelf life can be extended to several months in a refrigerated environment, which fully demonstrates the significant advantages of temperature-controlled storage compared to the days of freshness in room temperature storage.
Freezers
Freezers have sub-zero temperatures, commonly ranging from – 18 to – 25°C, and are used for “deep freezing” and “long term storage”. At this temperature, the water in the product freezes quickly, bacteria and other microorganisms virtually stop reproducing, and the quality and nutrition of the product is retained for a long period of time.
Products such as meat, seafood, frozen dumplings and ice cream all need to be stored in freezers. Taking frozen seafood as an example, putting it into the freezer quickly after catching can lock its fresh taste, and even if it is stored for several months, it can still maintain better quality after thawing, which is also the basis for the development of the frozen food industry.
How to Choose The Right Cold Storage Facility for Your Business
Cost and Pricing
Cost is a central consideration when choosing cold storage. There are various pricing models, ranging from per square foot, per pallet, per cubic volume, to fixed rate packages.
In addition to basic storage costs, additional costs such as insurance, utilities, loading and unloading should not be overlooked. It is recommended to read the contract terms carefully to avoid hidden charges. Enterprises can choose according to their needs: long-term storage is appropriate to sign a long-term contract to reduce unit costs; seasonal demand for short-term packages to reduce idle loss.
Technology and Equipment
The effectiveness of temperature control in cold storage depends on technology and equipment. Priority should be given to cold storage equipped with IoT sensors and automated monitoring systems, which can monitor the temperature in real time and provide early warning of fluctuations, reducing the risk of product spoilage.
At the same time, energy-saving refrigeration equipment can reduce operating costs and the probability of failure. For example, a pharmaceutical company uses intelligent monitoring cold storage to ensure that the temperature of vaccines is up to standard through real-time data, and there has never been a temperature control problem.
Energy Saving and Sustainable Solutions
Driven by the global “double carbon” goal, environmental protection and energy saving have become the key for enterprises to choose cold storage. Energy-efficient cold storage utilizes polyurethane insulation panels, inverter refrigeration and intelligent control technology, and some enterprises also introduce solar photovoltaic energy storage to effectively reduce energy consumption and carbon emissions.
Take a fruit and vegetable cold chain enterprise as an example, its solar photovoltaic cold storage through the “day storage and night use” mode, saving 20% of the annual electricity bill, significantly reducing carbon emissions, and setting up a win-win cold chain benchmark of environmental protection and cost, which is in line with the needs of sustainable development of enterprises.
Customer Service and Response
The service quality of cold storage is equally critical. Quality service providers need to be equipped with a professional team to respond quickly to demand. If the temperature is abnormal, they can quickly repair it; if they temporarily adjust the storage capacity, they can flexibly cooperate with it.
if they provide real-time inventory inquiry and regular inspection services, they can also enhance the cooperation experience. Choosing a cold storage with efficient service and good reputation can make the enterprise operation more worry-free.
Conclusion
Cold storage realizes the operation of “heat preservation, refrigeration and monitoring” through heat insulation materials, refrigeration system and intelligent monitoring to guarantee the freshness of products.
For perishable goods enterprises, adapted cold storage can effectively reduce losses, optimize costs and stabilize the supply chain. Enterprises can screen partners from the dimensions of technology, budget and service to ensure the quality of product storage.
