When planning a trip to nature or a long car trip, many of us wonder about the safety of food. The key component of any thermal container is the cold source, without which the bag turns into a regular backpack. Often consumers are looking for an answer to the question, what is the name cooling elementin order to choose the right consumables for their thermal box.
In the professional environment and technical documentation, this device is most often called cold accumulator or refrigerant. This is a sealed container filled with a special substance that can maintain a low temperature during melting for a long time. Understanding the operating principle of this element allows you to effectively use its capabilities.
Do not confuse this element with dry ice or regular ice, since the design and chemical composition here are completely different. Modern models allow them to be used multiple times, making them a cost-effective solution for regular travel. In this article we will analyze in detail the device, types and operating rules of these indispensable assistants.
Correct name and principle of operation of the device
The main and most correct name is cold accumulator. This is exactly how this item is listed in manufacturers’ catalogs and technical documentation. The principle of its operation is based on the physical process of phase transition of a substance from a solid to a liquid state. Unlike ordinary ice, which melts quickly and at strictly 0°C, special fillers can maintain the temperature in a certain range longer.
Inside the sealed housing made of food-grade plastic there is gel-like substance or saline solution. When frozen in the freezer, this substance crystallizes, accumulating cold. When you place a charged element in a bag, it gradually begins to give off cold, melting as it does so. This process is called latent heat of fusion.
⚠️ Attention: Never use damaged cold storage batteries. If the housing is cracked, chemical contents can get onto the food, which is hazardous to health.
The efficiency of work directly depends on preliminary preparation. In order for the element to give off maximum cold, it must be kept in the freezer at a temperature no higher -18°C for the time specified by the manufacturer. This usually takes from 8 to 12 hours until the gel completely crystallizes.
Main types of fillers and their characteristics
There are several types of fillers on the market, each of which has its own characteristics. The choice depends on how long you need to preserve the food and at what temperature. The most common option is gel filler. It is a viscous mass based on an aqueous solution of salts and thickeners. Its advantage is its high heat capacity and ability to maintain temperature for a long time.
The second popular type is saline solutions. They freeze at lower temperatures than water and melt more slowly. However, such elements are often heavier and may be more sensitive to temperature changes during storage. There are also combined models, where the gel is mixed with granules to increase the heat transfer area.
- 💧 Gel: are universal, keep cold for up to 10-12 hours, are safe when depressurized (usually), but can be heavy.
- 🧂 Salt: provide a lower freezing temperature, ideal for deep freezing meat, but require careful handling.
- 🧊 Water: the simplest and cheapest option, essentially frozen water in a durable bag, keeps the cold for only 3-5 hours.
When choosing, you should pay attention to the temperature conditions indicated on the label. Some models are designed for storing refrigerated foods (+2...+5°C), while others are designed for frozen foods (-18°C and below). Using the wrong type can lead to damage to the contents of the bag.
Design features and materials of the case
The outer shell of the cold accumulator plays no less important role than the internal contents. The case is made of durable, frost-resistant plastic that does not crack during sudden cooling. The most important parameter is tightness seams. Any microcrack will lead to leakage of the gel and loss of functionality of the element.
The shape of the products also varies. There are flat rectangular blocks that are convenient to place at the bottom of a bag or between layers of food. There are also shaped models, for example, in the form of water bottles or flexible plates that follow the contours of the bag. Flexible soft-pack models are especially convenient, since when empty they take up minimal space.
| Case type | Strength | Flexibility | Service life |
|---|---|---|---|
| Hard plastic | High | Absent | 5-7 years |
| Soft package (Soft) | Average | High | 3-5 years |
| Combined | High | Partial | 4-6 years |
High-quality plastic should retain its properties after hundreds of freezing cycles and defrosting. Cheap analogues can become brittle in the cold, which significantly reduces their service life. When purchasing, pay attention to the absence of cloudiness in the plastic, which may indicate the beginning of destruction of the structure of the material.
How to properly prepare the element for use
To achieve maximum efficiency, you must follow the technology of “charging” the battery. Just throwing it in the freezer for an hour is not enough. The gel crystallization process takes time. Place the element in the freezer, ensuring cold air access on all sides. It is not recommended to press it closely with other products.
The optimal temperature for freezing is -18°C and below. Full charging time usually ranges from 10 to 12 hours. If you take out the element earlier, when there is still liquid in the center, it will melt much faster. Visually, the finished element should become completely matte and solid, without transparent areas.
☑️ Preparing for the trip
There is a common mistake: some users try to speed up the process by immersing the element in cold water with ice. Do this absolutely not. A sharp change in temperature can cause deformation of the plastic or uneven crystallization, which will reduce the efficiency of operation.
Comparison with dry ice and ordinary ice
There is often confusion between cold accumulators, ordinary edible ice and dry ice ice. Regular ice (frozen water) melts at 0°C, turning into water that can wet food. Cold accumulators eliminate this disadvantage, since they are in an airtight container, and often keep the temperature below zero longer.
Dry ice is solid carbon dioxide (CO2). Its temperature is -78.5°C. This is an extremely low temperature that can “burn” the skin when touched and ruin some foods by freezing them too much. Cold accumulators operate in a more gentle mode, usually from -10 to -20°C depending on the type of filler.
⚠️ Attention: Dry ice cannot be stored in hermetically sealed containers or cooler bags without ventilation, since when it evaporates it creates excess gas pressure.
Can dry ice be used in a regular thermal bag?
You can use dry ice, but with caution. A regular cooler bag is not designed for such extreme temperatures. The inner layer of foil may crack and the plastic may become rough. In addition, food lying nearby may freeze. It is better to use specialized containers or lay a layer of cardboard between the ice and food.
Thus, for standard picnic trips or food delivery from the store cold accumulators are the safest and most convenient option. They are predictable in operation and do not require special precautions during transportation.
Operating rules and safety precautions
The service life of a high-quality cold accumulator is practically unlimited if you follow the operating rules. The main requirement is not to expose the element to mechanical shock, especially when frozen, when the plastic becomes more fragile. You should also avoid contact with sharp objects inside the bag.
After use, the element should be washed with warm water and a mild detergent and wiped dry. It can be stored at room temperature in a discharged state. It is not recommended to store charged cells outside the cooler bag, as they will waste their cold resource.
- ❄️ Do not refreeze the cell until it is completely defrosted and warmed up to room temperature.
- 🚫 Do not heat the battery on purpose (for example, in a microwave or boiling water) to speed up defrosting.
- 🧼 Avoid using abrasive sponges when washing so as not to damage the surface of the plastic.
If you are planning a long trip, calculate the amount of refrigerant at the rate of 1 kg of battery per 10-15 liters of bag volume or for 5-6 hours of battery life. To increase the cold retention time, you can alternate layers of products and elements.
Frequent problems and ways to solve them
During operation, users may encounter a number of typical situations. For example, an element may not freeze completely, remaining viscous. This often indicates that the temperature in the freezer is not low enough or the proportion of components inside the gel is incorrect (a rare manufacturing defect).
Another problem is the appearance of condensation on the outer surface after removal from the freezer. This is a normal physical process. However, if condensation appears as a liquid from the inside, then the seal is broken. Such an item must be disposed of, as the contents may be toxic.
It is also worth noting that over time the gel may delaminate or change color. If this is not accompanied by loss of tightness and ability to keep cold, operation is usually allowed. However, if an unpleasant odor appears, it is better to replace the consumables.
FAQ: Frequently asked questions
How long does a good cold last? battery?
The operating time depends on the volume of the bag, the number of products and the external temperature. On average, one fully charged element weighing 400-500 grams keeps a bag with a volume of 10-15 liters cold for 6-10 hours. Under ideal conditions (full load, no opening), the time can reach 15-20 hours.
Is the gel inside dangerous if it leaks onto food?
Most modern batteries use non-toxic gels based on propylene glycol or saline solutions. They are not poisonous, but may cause mucosal irritation or stomach upset if ingested. If the gel gets on the product, it is better to throw it away. The surface of the bag must be thoroughly washed.
Is it possible to freeze the battery in the freezer along with food?
Technically it is possible, but not recommended. During the crystallization (freezing) process, the element may briefly heat up or, conversely, greatly cool the space around it, which can negatively affect nearby products. It is better to charge it separately.
Why did the element swell after freezing?
A slight increase in volume during freezing is normal for aqueous solutions. However, severe swelling may indicate overfilling of the housing during production or a violation of the temperature regime. If the plastic is stretched like a drum, there is a risk of rupture; it is better not to use such an element or place it in an additional bag.
How to recycle an old cold storage battery?
The plastic case is a recyclable material (usually marked PP or PE). The contents (gel) in small quantities can be washed down the drain with large quantities of water, as it is biodegradable. However, it is better to check the recycling rules in your region, since the compositions may differ.