We buy 3 sheets of Penoplex 50mm thick. We cut into pieces according to the drawing.
I used a meter iron ruler and a stationery knife. Place something under the sheet along the cutting line. Take care of the floor if you are doing this in an apartment and your fingers. We don’t dance on the penoplex, we don’t hit it. Dents won't heal
From the sides where the manufacturer did not cut the joining groove for us, we cut it out. 25x25mm.
We collect what happened and check it. If all is well, rejoice, we cover the inside of the thermal box with aluminum tape with an overlap. Then it will be inconvenient to paste over.
Glue the walls and bottom. I used liquid nails for a moment, but there is a special one. glue for penoplex. We also plug the cracks with glue. We wait until the glue sets.
We seal the joints inside the thermal box with aluminum tape. You can also cover the outside with tape. Sold in different colors.
I painted it with water-based paint in two layers. Because it is. Holds up well.
Now about his work. This happens to me. I dragged the tank with the wort to the thermobox (I’m on an office chair, on wheels, rolling around the apartment). I attach a temperature sensor to the side of the fermenter, below the waterline, cover it with insulation, and secure it with tape. I move it from the chair to the thermal box. We are careful not to turn off the tap, it is aimed at the corner of the thermal box, and... watch your back. Although brewers are a strong people, still...
To maintain the temperature, I use frozen water in liter PET bottles. At the active fermentation stage, there are 2 bottles of ice (in the corners of the fermentation room). Change once or twice a day. We monitor the temperature you need! The first day the wort will actively absorb the cold, and even warm up from fermentation. After a couple of days it will stabilize. And to maintain the temperature (I usually have 18-19 degrees) you only need one bottle. I change it once a day. There may not be much condensation forming under the bottles. At the end of fermentation, wipe everything off if it is not dry. We disinfect with alcohol or your product.
I take a drop of new beer for the refractometer through the hole in the fermentation lid, removing the water seal, using a disposable plastic cocktail straw.
No one has canceled the disinfection of everything! All the best.
*I saw the idea of a thermobox on the Mirbir forum in the topic “Cooling the fermenter”.
Source: xn--90aia8b.xn--p1ai
DIY cold accumulator
A portable cooler is necessary in many life situations. The device will come in handy on a long trip, at the dacha, or at home during blackouts. Devices can be purchased at retail stores.
If for some reason the purchase is impossible, it is quite possible to make a cold accumulator from available materials with your own hands according to the principle of a “homemade” cooler. To make it you will need table salt, water, any hermetically sealed food container or plastic bottle.
A functional bag as a result of work
It is possible to assemble such a thermal bag in just 10 minutes.
The thermal bag works on the principle of a thermos - it retains heat (cold). It cannot produce cold on its own; to do this, you will need to place inside the bag cold-producing cold elements for thermal containers that you made yourself. Even a child can cope with such work, and in the end you have a mobile food cooling device. True, this does not work for long; over time, the container still loses its seal, so if you are going on a long journey, you cannot do without coolers, or buy a mini-fridge in a specialized store.
Homemade coolant from diapers
The refrigerant from baby diapers is strange at first glance, but in fact it is an effective cold accumulator. It will perfectly replace an industrial device and will maintain the desired temperature throughout the day. There is no need to put the diaper directly into the thermal bag to keep it cold; just remove the inner gel-like mixture from it.
To make an unusual coolant for a cooler bag with your own hands, you need to take:
To increase the efficiency of the cold accumulator, it is additionally frozen for several hours.
When making a refrigerant, you can add any food coloring to the water, resulting in not only a useful, but also an aesthetically attractive cold accumulator.
Cooling element and bag
Often, a portable refrigerator not only has to be carried in a car, but also carried on the shoulder or in the hands; if you need to travel with such a load in public transport crowded with passengers, then a soft cooler bag would be a more preferable option. To do this, select a spacious bag made of polyester or durable canvas fabric.
For soft refrigerators, it is easier to replace foam walls with EPS sheets, and line the inner surface with isolon. In this case, the box of the refrigerator is glued together using durable construction tape to eliminate cold leaks through the foam joints; for a soft refrigerator, an outer cover with a foam cover with Velcro fastening is sewn from isolon. Even if you drop such a refrigerator, it will still remain intact and will serve for many years.
You will need several cold packs to get the job done. It is best to use ready-made industrial elements with a gel filler, but you can make your own. The bag is glued with polyurethane glue from several layers of polyethylene film and filled with a gel made from boiled salt water and a thickener. The bag is filled 60%, the air is removed, after which the filler hole is sealed with a hot iron. For a 10-liter thermal box you will need four half-liter bags, frozen in the freezer to minus 18-20 o C.
How to make a cold accumulator
To prepare the refrigerant, you need to dissolve 400 grams of salt in one liter of water. Then add about three liters of liquid and wallpaper glue. The last component is a thickener. The result of combining should be a jelly-like composition. The liquid is poured into a plastic container and frozen.
A simple way to make a cold cell from scrap materials. You can make a water-salt solution or a gel-like mass based on water and wallpaper glue.
Important: when freezing, the liquid expands. Therefore, it is necessary to fill the container not completely.
Stages of self-production
Many people create cold storage batteries with their own hands. The advantages of this solution are obvious:
- devices are made from improvised materials available in every home - their cost is extremely low;
- manufacturing requires a minimum of time and effort - preparation will take no more than 10-15 minutes, the rest of the time is freezing the homemade refrigerant.
First you need to collect a basic set of raw materials and supplies - 0.5 and 1 liter plastic bottles, table or Glauber's salt, wallpaper glue or gelatin. The manufacturing nuances in each option will be slightly different.
With table salt
You will need: 1 liter of ordinary water, 450 g of table salt, plastic containers of the required volume.
Step-by-step algorithm:
- The components for a strong solution are mixed and slightly heated so that the salt crystals dissolve faster.
- The resulting liquid is poured into a juice container, bottle or durable plastic bag.
- Freeze at minus 18 degrees.
- After 8-10 hours, the finished refrigerant is wrapped in a terry towel to create proper thermal insulation, and a bag is put on top so that the condensation that forms does not fall on the food.
This cold accumulator will keep food at a temperature of -15° for 11-13 hours.
With Glauber's salt
Mirabilite is widely used in refrigeration, so it is perfect for making homemade refrigerant. You will need: 1 liter of water, 200 g of salt itself, 10 g of gelatin or wallpaper glue.
The step-by-step algorithm is not much different from the first option:
- A saline solution is prepared, then it is thickened with gelatin (glue).
- The finished mixture is poured into a bag or bottle and placed in the freezer for 6-9 hours.
- The container is wrapped in terry cloth and placed in a bag that will collect condensation.
In the thermal bag, Glauber's salt coolant maintains a temperature of -10° for about 8-10 hours.
With wallpaper glue
To prepare, you will need a plastic container, 1 liter of water, 40 g of dry wallpaper glue. Step-by-step preparation:
- Combine water and dry mixture and stir well until a gel-like consistency is obtained.
- The solution is poured into a prepared container and frozen in the freezer.
The refrigerant will keep food in the thermal bag for up to 11 hours at temperatures below 0.
The approximate ratio of wallpaper glue and water to create a cold storage device is 4:100.
With gelatin
To create a gelatin refrigerant, prepare 4 liters of water, table salt, 10 g of gelatin, and a plastic container.
- Pour salt into 1 liter of water in a ratio of 10:3 and stir thoroughly. The sodium chloride should be completely dissolved.
- Then dilute the mixture with the remaining 3 liters of water and add gelatin. Stir well again - the liquid should thicken a little.
- The solution is poured into a plastic container and placed in the freezer until completely frozen.
The gel substance melts more slowly than the options described above, so it will keep the cold inside the thermal bag for 8-10 hours.
Choosing the right battery
When choosing a cold storage battery, it is important to consider that the characteristic blue color does not have any functional properties: this effect is provided by the dye. The lifespan of industrially manufactured batteries is unlimited. Manufacturers guarantee environmental friendliness and safety of materials that do not change their characteristics depending on time and sudden temperature fluctuations. Typically, the capacity of a standard battery is 250-800 ml.
When choosing a battery for your needs, take into account its parameters: volume, design, filler composition.
Making a box frame
We make a drawing of the required size of the box and cut out the blanks strictly according to the square. Next, we apply silicone to the ends and assemble the structure. While the silicone has not hardened, it is possible to make adjustments. Afterwards, leave for a day for the silicone to completely set. Next, we cut out the outer skin from thin polystyrene foam and glue the overlapping seams on the sides with liquid acrylic nails.
Then we cut out the reinforcement for the bottom of the box from low-modulus carbon fiber and glue it to silicone.
We cut out the lid according to the external size. On the inside there is a lid seal. We glue the seal onto silicone.
We process the box with sandpaper and prime it with PVA.
How to use a cold accumulator for a thermal bag
Using ice makers is not difficult. Before use, the devices are placed in the freezer compartment. After the liquid freezes, the coolers are placed in an isothermal bag in one pattern or in combination. The devices are installed on the bottom and on top of the provisions. Layer-by-layer placement or only on top of products is allowed.
After use, the containers are washed with running water and placed in a stationary freezer. To increase service life, store the device in the refrigerator.
Refrigerator body assembly
Cutting sheets for making thermal insulation from foam plastic usually does not present any particular difficulties. Even if you lack experience and skills, marking and laying down the four side walls, the bottom and the foam cover will not be difficult.
An EPS bottom will be much stronger and more reliable than polystyrene foam, especially if the outer body of the refrigerator is planned to be made of plastic, or will be absent altogether.
To glue the heat-insulating foam body, you can use PVA and loose gauze fabric. Acrylic resins glue foam plastic worse; it is strictly not recommended to use the most durable polyurethane, bitumen or epoxy compounds; this is not the best option for products.
After gluing the polystyrene foam box, the surface inside and outside the refrigerator will need to be lined with isolon or other thin-sheet foil-coated polyethylene foam. As practice shows, various cladding options made from reflective films, paper or food foil are much more expensive and provide extremely low strength of the reflective surface.
Only after this can you take measurements to make a plywood box. If you already have at your disposal a plywood box with a lid of the required size, then you can do it much simpler - remove the internal dimensions of the future refrigerator, reduce it by 6 mm for the isolon sticker and cut out the heat-insulating box from polystyrene plastic according to the already known dimensions.
We glue a layer of foam plastic on the lid of the refrigerator so that the sheet of foam thermal insulation is completely immersed inside the box, and does not just cover the top plane. We attach the plywood cover to the piano furniture hinge using self-tapping screws.
Be sure to install a lock or latch that tightly presses the top cover and foam to the body.
What is a cold accumulator
A portable device for cooling food is a portable thermal bag with a cold-producing container inside. Substances that can accumulate cold are used as refrigerants in containers.
Food stays fresh for a certain period of time. This period depends on the composition and volume of the coolant. The size of the container is adjusted to the amount of food.
The container with the refrigerant is “charged” in the freezer compartment of the refrigerator for several hours. Then the cold element is placed in a special bag, which well maintains the required temperature regime. The creation of such conditions is ensured by the structure of the material. The walls are made of porous materials covered with aluminum foil.
Depending on the type of refrigerant, batteries last about 5-24 hours. Some refrigerant options are capable of functioning and storing food for up to a week.
Preparation and action
It is not difficult to prepare a cold accumulator for use. The containers are placed in the freezer, turning on the maximum cooling mode, for the time necessary to completely freeze the liquid. Freezing time directly depends on the type of filler. You can then use it in an isometric bag throughout the day, the battery will take heat from the food, keeping it fresh.
The useful life of the battery depends on several factors:
- battery type;
- insulating properties and volume of the bag;
- rationality of placement;
- initial temperature of the products.
Depending on the size of the bag, you may need several batteries. It is very important to place them correctly in the space of the bag:
- can be placed on top of provisions;
- arrange horizontally in layers;
- place above and below.
As the composition in the battery container defrosts, it is removed from the bag, washed with water, wiped dry and placed back in the freezer.
It is necessary to store the cold accumulator in the refrigerator when it is not in use, this ensures the safety of the accumulator and increases the life of the refrigeration-freezer device.
Using cold storage tanks
The principle of operation of drives is the same for all types. Before using a portable compact cold generator, a person needs to charge it. To do this, you need to put the device in the freezer for 8 hours - until the refrigerant inside the sealed container freezes. In the case of refrigerators with a no-frost system, the placement of the battery does not matter. When ice freezes in the freezer, it is advisable to place the storage unit closer to it.
It is recommended to store it in the freezer during periods when the storage device is not needed. The absence of temperature surges allows you to increase the operating period of the device.
Keeping the battery in the freezer for a long time does not affect the performance of the device in any way - sub-zero temperatures do not render the refrigerant or the sealed case unusable. After the element has used up its charge, the drive is thoroughly washed, the case is allowed to dry on its own, and then put back into the freezer.
It is necessary to clean the drive after each use, since condensation that occurs during use of the battery leads to contamination on the surface of the sealed container. The material is able to absorb various odors of food and medicine. If the housing has already absorbed odors, it is virtually impossible to remove them - there is a risk of damaging the seal.
Most often, one cold accumulator is enough for a refrigerator bag, which is placed on top of food or medicine. But, sometimes it is advisable to stack several drives. When using several elements, they are placed not only on the products, but also between and under them. This need arises in the following situations:
What is needed for making
You need to start making a refrigerator bag by drawing up a drawing and preparing materials. The drawing is made from several angles indicating the dimensions of the parts. This will make it easier to calculate the necessary funds. Next, a brief description of the design is compiled with a breakdown of the interlayers that provide the thermal effect.
What can you use as the basis for a bag?
You don’t need to sew the base of the design; just use a shopping bag or travel bag.
It must meet the following criteria:
- stable base;
- suitable size (volume);
- presence of a zipper lock;
- waterproof material without mechanical damage.
Reference! The length of the handles and the shape of the base are selected taking into account your own preferences and convenience in the further use of the thermal box.
Sewing the base yourself is also easy. Both polyester and leather substitutes are suitable for fabrics. In any case, preference is given to synthetic materials, since they are easier to care for.
To make a car bag, the following can be taken as a basis:
- wooden box with lid;
- thick cardboard box;
- Plastic container.
Thermal insulating layer
The main function in the design is assigned to the thermal layer, which follows the shape of the base. It is placed inside the bag. For manufacturing, you can use materials with low thermal conductivity. Foamed foil polyethylene (isolon) is most often used. Its properties are ideal for a portable refrigerator. Preference is given to polymer with a double-sided foil coating 0.5 cm thick.
Reference! The function of a heat reflector can be handled by: dense black polyethylene or polystyrene foam. The first option is inferior to foil insulation in heat resistance, the second - in size.
What tools are needed
It is worth taking care of the tools in advance so as not to be distracted while assembling the structure by searching for the necessary device.
The following will be useful at work:
- scissors;
- awl;
- measuring instruments (ruler, tape measure, etc.), marker;
- a set of needles (if you need to sew the base parts);
- strong threads;
- tape (regular, double-sided and foil);
- zipper;
- foamed foil polyethylene.
Build process
The assembly algorithm for a mobile refrigerator consists of the following steps.
- From the bag chosen as the base, cut off the pockets, remove partitions and other decorative elements.
- Take measurements from the internal surfaces and use them to make a pattern for thermal insulation.
- Cut out the cutting details from isolon.
- Connect the elements at the joints using tape. The first penetration is made with ordinary adhesive tape. A layer of foil tape is placed on top of it.
- Place the resulting box inside the bag. The surfaces must fit snugly against each other. In some places, you can secure the parts of the base and thermal protection with double-sided tape. The voids are filled with foam rubber.
- If the bag has a flap in the form of a lid, it is also insulated with polyethylene foam.
Properties of cold sources
For the production of the storage devices in question, only safe polymer materials that do not threaten human health are used. The capacity of magazine devices is generally from 0.25 to 0.8 liters.
The use of a film surface allows you to give sources that have not yet frozen the desired shape. In addition, temperature changes do not have a negative effect on them.
The outer part of the gel devices is made of film, and the substance of the same name, which has high thermal conductivity, is used as a filler.
The use of gel cold sources allows you to create an area of low temperatures (inside the container, bag), as well as maintain a certain temperature of the products, so that they can remain warm longer.
Carboxymethylcellulose, which is a gel-forming substance, in case of damage to the film and accidental contact with food or medicine, does not spoil them and does not have a negative effect on the human body.
Varieties
There are several types of cold batteries: silicone, gel, water-salt. Having understood their differences, you will be able to understand which is more effective and choose the best option for yourself:
- Silicone. This type of cold accumulator maintains a low temperature for the longest time - from 0 to +5 degrees throughout the week. It looks like a rectangular film package. Inside it is a special silicone mixture that freezes quickly and melts slowly.
- Gel. This type of cold storage battery is the most common. It looks like a dense, sealed, rectangular bag. It contains a gel-like substance inside that keeps the inside of the bag cool. It can also be used as a heat accumulator. It supports a wide temperature range and operates for up to 16 hours. If the filler leaks, you don’t have to worry - simply wipe the surface with a napkin or rinse with water. The gel will not spoil the products, it is completely safe and does not harm the body.
- Salt cold accumulator. Appearance: rectangular plastic box. It contains a water-salt solution inside, which can be added if necessary (but not all manufacturers provide this possibility). The battery maintains low temperatures, down to approximately -10°, throughout the day.
The most efficient battery is silicone. It keeps the temperature for about a week. You can cross the Sahara Desert with it and the ice cream will remain cold. There is a downside: the manufacturer does not guarantee that silicone is safe. If it gets on food without packaging, it can cause poisoning.
Silicone cold accumulator
Silicone cold accumulator
Gel cold accumulator
Salt cold accumulator
Salt cold accumulator PM0941
How does a cold accumulator work?
Operating portable devices is easy. Place the container with the coolant in the freezer of stationary equipment and keep it until frozen. Place the finished battery in a thermos bag. In an insulated container or bag, the generator takes on the heat, cooling food or medications.
If one generator is used, it is better to place it on top. Using more makes the task easier. Cold packs can be stacked in layers with grocery bags and containers. After use, generators are washed with water and stored in the freezer of stationary equipment.
Cold generators are used to maintain sub-zero temperatures in freezers during blackouts. Refrigeration elements compensate for electricity costs, helping to turn on the refrigeration unit engine more rarely. They also enhance the freezing effect. Refrigeration generators work as storage devices for sanitary defrosting of equipment.
Recommendations for using a refrigerator for fishermen
After each use (storing fish or bait), the insides of the heat chamber and the outer walls should be cleaned with a damp cloth. Since the device accumulates cold relatively inertly, at an external ambient temperature of 20 ° C, the temperature inside the thermal chamber will reach +3 ° C only after 35 minutes of operation. To maintain the cold inside the chamber, the lid of the refrigerator should be opened as little as possible during operation.
Additionally, you can carry out an event to maintain the temperature in the heat chamber. To do this, you will have to open the cover of the car refrigerator to the step illustrated in photo 3. And lay a self-adhesive insulating sealing tape around the perimeter of the inner cover, used for sound insulation in car repair shops (to reduce noise and vibration of contacting plastic parts). This tape is freely sold in auto supply and/or home improvement stores. How to do this correctly is shown in photo 7. After laying the tape around the perimeter, the lid is assembled in the reverse order, tightening 6 screws until they stop. Now your new thermal saver is ready for fishing and outdoor recreation.
Cautions
There is a limitation based on the electrical characteristics of the built-in fan - active continuous operation for no more than 36 hours. However, this time is quite enough for a trip to nature. For those cases when outdoor living conditions and operation require more time, it is enough to turn off the car refrigerator for 2 hours and then turn it on again for another 36 hours. It is not advisable to keep the refrigerator box near an open fire, so as not to damage the integrity (deform) of the sealed chamber.
You should also not completely immerse the refrigerator in water, since it contains electrical parts and components (fan, cooler with Peltier elements, battery), so as not to damage the refrigerator and harm the environment. Covering (either unwittingly or intentionally) the ventilation grille will cause the cooling efficiency to be greatly reduced. For the same purpose, it is not advisable to operate the refrigerator in the desert, on the beach or in places with a lot of dust. On the other hand, practical tests have shown that the modified auto-refrigerator serves well both in summer and winter and can keep not only frozen fish for you for several hours, but even ice and snow (see photos 8 and 9).
Reviews
Anton, Nizhny Novgorod Some time ago I bought myself several Technokhim AX-15 cold storage batteries. We often go with our family on various picnics in the summer and take food with us. We've had a thermal bag for a long time, but we used to use dry ice in it. We carry a small amount of groceries for a family of 3 people. Our car is small and, accordingly, we bought the thermal case with limited dimensions so that it fits in the trunk without any problems.
We bought three Technokhim AX-15 cold storage batteries. I usually put one at the bottom of the bag, one on top, and one in the middle. Cools normally, food is stored without problems. Of course, they are unlikely to be able to keep ice cream at the required sub-zero temperature. But products that are usually kept in the general compartment of the refrigerator are preserved well. I was pleased with the purchase.
Every year in the summer we go to the sea by car. To carry food with me, I bought several Freezpack cold storage batteries. I had a thermal bag for a long time, but I had nothing to do with cold storage batteries. I only carried something hot in it so that it would cool down more slowly. The cold accumulator is a plastic container with a screw cap and a carrying handle. Very comfortably. I put it in the freezer in advance, and then in a thermal case I line the bottom and walls with these batteries. It turns out that the food is inside, like in a refrigerator. Inside the plastic containers there is a liquid that looks somewhat denser than ordinary water. When it's not in season, I store these containers in the freezer. The road to the sea takes us about 20 hours. All foodstuffs were preserved normally during the journey, and those that remained with us at the end of the trip were still cool. Although the liquid in the batteries was melting. In general, the purchase for motorists is quite useful and inexpensive. One such cold storage battery cost me about 120 rubles. I have 5 of them in total. Valentin, Tambov
I have several Eva cold storage batteries with gel filler. In general, I rarely use it. Mostly they are in my refrigerator. I use it in my thermal bag when we go somewhere by car. But several times they helped me out a lot during an unscheduled power outage. The batteries lay inside and gradually released the accumulated cold. Thanks to this, the products did not spoil.
Block container manufacturing technology
All manufacturers adhere to the same scheme:
- Project development. They prepare a drawing of a block container according to the dimensions agreed with the customer, and calculate the permissible loads on the roof (150 kg/m2) and walls. For example, a structure with wall panels 115-126 mm thick can be installed as a single-module block. To assemble a two-story building, the roof of the lower module must withstand 150 kg/m2. Manufacturers post diagrams and drawings of modular blocks on their websites.
- Frame assembly.
- roofs. The steel sheet is welded to the frame, PVC film and insulation are laid on the inside. The ceiling is sheathed with finishing material.
- Floor. Logs made of wooden beams, thermal insulation and chipboard are laid on the rough boards, and flooring is placed on top at the request of the customer.
- Construction of a wooden frame for installation of wall panels. Openings are marked in the sheathing and partitions are made.
- Installation of windows, doors. Tilt-and-turn frames are installed. Platbands are installed at the stage of finishing work.
- Cladding of external walls.
- Insulation.
- Interior decoration.
- Laying wiring, installation of electrical installations, lamps, automatic machines.
- Additionally - installation of plumbing, exhaust hood, sewage systems.
It takes 1-3 days to assemble a block container of standard sizes and layout. Custom designs require up to 6-7 days. Many companies carry out complex work - from the manufacture of cabins to the construction of turnkey prefabricated buildings. Customers can choose from standard projects (with drawings, estimates) or order the development of technical specifications in relation to the operating conditions of quick-assembly systems and their specifics. Since the module weighs about 2.5 tons, it does not require a capital foundation—concrete blocks and screw piles are sufficient. The maximum number of floors in a building built using modular technology is 3 floors.
What are cold storage batteries used for?
To maintain low temperatures in stationary refrigeration equipment, refrigeration generators are used. Used as additional devices in the following cases:
The use of batteries helps maintain the lowest possible temperature in the refrigerator and freezer compartment for a long time. When defrosting, sanitizing, and turning off the lights, food is preserved for up to 12-18 hours. The period of sustained low temperature depends on the type and number of generators.
Alternative to factory batteries
Do-it-yourself cold storage devices are, of course, inferior in properties to factory-made devices. But, if the planned trip does not take much time, they may be quite useful.
The simplest option for a cold source at home is frozen water in a bottle (both plastic and glass will do). This type of battery has a big drawback: the ice melts quickly, as a result of which the low temperature in the insulated bag does not last long. The best performance of a homemade invention can be achieved by adding salt or alcohol to the water.
So, the materials at hand needed to make a cold storage tank:
- plastic bottle;
- water;
- salt or alcohol.
The approximate ratio of the last two is 10:3 (for example, 100 g of water and 30 g of salt). The freezing point of such a liquid is about -20 degrees. If it does not freeze for a long time, you need to drain a little of the solution and add clean water.
The thermal conductivity of a concentrated aqueous salt solution is approximately 236 kJ/kg. This value is not a limit: it can be increased, but the freezing temperature of the composition will decrease.
If you add wallpaper glue or gelatin to the salt solution (the consistency of the solution should be similar to a gel), the resulting battery will melt more slowly compared to previous versions of the devices. For greater efficiency, homemade batteries should be placed at the bottom of the bag and on top of its contents. If necessary, you can additionally place them between products.
The composition of fillers in factory batteries is determined using special formulas. Therefore, the parameters of such devices differ significantly from home inventions. However, homemade batteries can be useful in cases where there is no factory-made device, but you need to travel and carry groceries or medicine.
Cold storage
Civilization develops best in the cold. It is unknown why, but this is how it happened historically. The southern hemisphere cannot boast of highly developed and technological countries, for the most part.
The northern regions, in this regard, are ahead of their neighbors, because in colder conditions:
Some relaxation associated with abundant harvests in the southern regions leads to a slowdown in the process of state building. People simply don’t need to unite into communities; they will survive anyway. But regardless of living conditions, they haven’t come up with anything better than cold to preserve their food:
What is this invention?
In its simplest form, a cold accumulator is a plastic bottle filled with salted water. It is enough to place it in the freezer for a day, then take it out and put it in your thermal bag so that the food and drinks in there remain at a low temperature for as long as possible.
In this water (filler) you can dissolve:
- Salt;
- Isopropyl alcohol;
- Glycerol;
- Carboxymethylcellulose.
All this will increase the heat capacity of water - it will take longer to freeze and release heat more slowly. Those. will be able to cool longer what needs to be stored at low temperatures.
If you want a “frosty blue” color, just like in the store, add dye.
Cold storage batteries do not always meet the expectations of their owners, and why should there be any surprise? It's just a frozen container of liquid.
How to make a cold accumulator for a thermal bag
To make a refrigeration generator you will need a minimum of substances and items. One of the components can be used as a refrigerant:
Preparation of the water-salt solution will take a minimum of time. Sodium chloride dissolves in a small amount of water. Add as many crystals as can dissolve.
The mixture is then diluted with water and frozen in plastic containers or bottles. Why a large amount of salt is needed is the answer to the question in the following description.
Balun technology
In some cases, the Balun frame technology is used, which has some features:
- first, the lower strapping belt is made;
- stands made of bent or seamless profile are welded onto it;
- An upper strapping belt is created on top of the racks, and crossbars are mounted above the door/window openings.
This technology is less material-intensive compared to the Platform. However, thick-walled rolled metal is used here to strengthen the frames of block containers intended for harsh operating conditions or placement of technological equipment. In the enclosing structures, the block container North contains the required amount of thermal insulation material for the specific climatic conditions of the region.
Coolers for insulated bags
The refrigerant of thermal bags (cold accumulator) will help preserve the desired freshness of food in an insulated bag on hot summer days. The storage unit itself will be required if you need to maintain a certain temperature for a long time, which exceeds the capabilities of the bag.
The thermal container itself can withstand temperatures for 2-3 hours. But if travel time is longer than this, food and drinks may spoil. During the trip, a coolant should be placed in the thermal bag, which will maintain the temperature even longer.
The undoubted advantages of a modified refrigerator for fishing
Taking into account the low price of the refrigerator and its simple modification (so that it serves the fisherman in autonomous mode), today there is no reasonable alternative to such a device. After all, even after turning off the power to the refrigerator compartment, its contents will remain frozen (remain cold) for a long time (according to my tests, if you do not open the lid, the accumulated negative temperature down to 0 ° C can remain for 12 hours or more).
What can you store? Bait, fish, crayfish (including live ones - to do this, fill the thermal chamber with water within reasonable limits), medicines, snow, ice and much more. The rotation noise of the refrigerator fan is low, which is also confirmed by a special test. I carried out the “noise test” using a special professional sound level meter DVM401, which showed a level of 71.2 dB when the microphone sensors directly approached the operating refrigerator fan (see photo 6). For comparison: the fan of my laptop makes approximately the same sound if this noise is recorded with the same device in the immediate vicinity of the noise source. Thus, for fishing and tourism this device can be considered quite acceptable.
Cold battery test
Tests carried out with freezing of plain water and saline solutions of different concentrations showed obvious results. The more sodium chloride is added, the longer the freezing process (up to 24 hours) and the slower the defrosting of the accumulating liquid occurs.
Testing the quality and freezing properties of domestically produced gel coolers showed positive results. After “charging” in the freezer at a temperature of -23 degrees, the substance crystallizes. This affects the duration of freezing.
Video: Cold accumulator
Video: Cutting the cold accumulator. What is inside?
We cut the cold accumulator. What is inside?
Medical thermal container
9 l (in bag)
Internal volume: 9.19 l External dimensions: 40.5 x 27.5 x 28.8 cm Internal dimensions: 30.0 x 17.5 x 17.5 cm Empty thermal container weight: 1.12 kg (±10%)
25 l (in bag)
Internal volume: 24.75 l External dimensions: 48.0 x 40.0 x 45.0 cm Internal dimensions: 33.0 x 25.0 x 30.0 cm Empty thermal container weight: 1.60 kg (±10%)
38 l (in bag)
Internal volume: 37.71 l External dimensions: 54.5 x 48.0 x 48.0 cm Internal dimensions: 38.0 x 31.5 x 31.5 cm Empty thermal container weight: 2.36 kg (±10%)
80 l horizontal (in bag)
Today, there are several options for thermal containers on the market, which are designed for transporting various items and are divided into 6 categories:
large, designed for transporting large goods in trucks;
How to choose a device
Cold storage tanks differ in design features, type of refrigerant and its volume in a sealed container. These parameters must be taken into account when choosing a refrigeration device. The color of the refrigerant does not in any way affect the characteristics of the battery and does not carry a functional load, unless otherwise specified by the manufacturer on the packaging.
Some factory cold storage batteries can not only be frozen, but also heated. The substance inside the container is capable of keeping food warm. When it is necessary to use a cold accumulator as a heater, it is charged in the microwave. The heating time should not exceed that specified by the manufacturer.
Heating in a microwave oven is only possible in the case of purchased drives, the manufacturer of which allows their use with heating.
Conditions for long-term operation of a fishing refrigerator
In order for a fishing refrigerator to serve for a long time and with high quality, you will need to, if possible, fulfill several simple conditions. Connection to the device must be made in compliance with polarity (+ and -). So the car refrigerator will serve the fisherman for an unlimited number of years. In order to preserve the cold in the thermal chamber even more, I recommend putting 2-3 sealed isothermal cold accumulators inside (flat flasks measuring 10x20 cm, with filler from any manufacturer), you can purchase them in the same stores for a symbolic price of 150-200 rubles.
Thermal bag with foil
Most often, this option is used to preserve chilled food in particularly hot weather. The reflective ability of the foil protects against sunlight and reduces its effect on the temperature inside the device.
If the inner surface of the container is made of such material, this increases the thermal insulation qualities of the bag. Such devices usually cost more, but they are more effective than regular bags. Choosing the option with foil is useful if you often go on long trips.
Source
Advantages of the device
The thermos for a baby bottle is as convenient and versatile as possible, capable of holding food containers of different sizes and keeping baby food warm. The device has a Velcro fastener that allows you to hang it on the stroller. As a rule, each thermos bag is quite roomy, which is very convenient when you need to take a change of clothes for the baby and small things for the mother (phone, wallet). Thermal bag models come in various colors. They are compact and have a shoulder strap whose length is adjustable.
Thermoses and baby food bags are made from materials that have been tested for environmental friendliness and must bear certification marks.
The most common thermos for a baby bottle is a container with a lid, which is made of a material with thermal insulation properties, placed in a case with a handle.
The layer that helps maintain the required temperature may be different. The essence of the action is the poor conductivity of heat by porous materials. It is not recommended to leave such thermoses and bags in direct sunlight. It is not advisable to wash them. It is easy to keep clean. You need to regularly wipe the product with a cloth soaked in soapy water. After each use, clean the surface of the thermos from the inside.
What is important to consider when buying a thermos:
- the wall thickness of the thermos should be optimal;
- the lid fits securely;
- The height of the thermos is suitable to fit a baby bottle with a pacifier;
- It is advisable to try on the baby food container for the thermos before purchasing;
- It is mandatory to check for foreign odors from the parts of the thermos;
- if the thermos has a stopper that screws on, then there must be an o-ring on the product;
- The cover material should be easy to clean.
