Comparison Hyundai HY-MC40F vs Mystery MRK-26

The principle of operation of an car refrigerator, in other words, the cooling method used in it.

— Thermoelectric (Peltier). Cooling using thermoelectric plates, so-called. Peltier elements. When current is passed through such a converter, one side of the plate is cooled, and the other side is heated. Thanks to this, in car refrigerators of this type, it is possible to implement not only cooling, but also heating (see "Operating modes"). Compared to compressor refrigerators, thermoelectric systems are much simpler, more reliable, more compact and cheaper. On the other hand, with higher power consumption, they have lower performance. And the efficiency of Peltier elements is not very high — in particular, they do not cool to a certain temperature, but to a certain number of degrees relative to the ambient temperature (usually 10 – 15 °C).

— Absorption. Absorption refrigerators are known as devices that can operate not only from electricity, but also from a gas cylinder. The principle of their operation is based on the absorption of ammonia by water and the heating of the water-ammonia solution with a heater; the heater can be either electric or gas. Accordingly, one of the main advantages of such models is independence from electricity. This is especially true when used outdoors, especially since the gas consumption is very low — for example, a 5-liter cylinder can last for almost 10 d...ays of continuous operation. At the same time, in terms of speed and overall cooling efficiency, such models are noticeably superior to thermoelectric ones, although they are inferior to compressor ones. On the other hand, the design of the absorption car refrigerator is quite simple, and the noise level is low. The volume of such units can be quite impressive — up to 100 liters or more.

— Compressor. Similar models use the same principle of operation as conventional home refrigerators. The compressor "drives" the refrigerant through the refrigeration circuit between the evaporator and condenser; cooling occurs due to the evaporation of the refrigerant, then excess heat is discharged to the outside through the condenser heat exchanger. This principle of operation is considered the most effective: compressor car refrigerators very quickly gain operating temperature and perfectly cool the contents, it is quite possible to provide freezing in them, and the volume of such a unit can be almost any. On the other hand, compressor systems are quite complex and expensive, they do not tolerate shocks and shaking, and they also require a constant power supply, which can create inconvenience during long field trips.

The volume of the working chamber of the car refrigerator. The larger the volume, the more products can be loaded into the unit at a time. When choosing according to this parameter, it makes sense to select a model with a margin, because it is not recommended to load products too tightly — this adversely affects the quality of the device. On the other hand, note that the volumetric container and dimensions will have the appropriate ones.

The presence in the refrigerator of separate zones for storing products, separated by a stationary dense wall of a non-removable structure. The vast majority of car refrigerators have a single-chamber layout, however, there are also two-chamber models, which is extremely convenient for sorting products.

— Cooling. A mode of operation in which the food placed inside is cooled to a temperature just above zero (the minimum threshold is usually around 4 °C). Present in all car refrigerators by definition.

— Freeze. An operating mode designed to cool the food placed in the cooking chamber to a temperature below zero (in some models down to -18°C). In some models, it can also be used for making ice in special compartments.

— Heating. The mode of operation for heating products is especially useful in the cold season. Many models with this function have fairly good heating characteristics, allowing you to heat food in them to a hot state. This mode is also good for keeping food hot. However, car refrigerators with a heating function are usually quite expensive.

This parameter determines how many degrees the refrigerator is able to cool the product loaded into it relative to the ambient temperature. Let's say the maximum cooling for a particular refrigerator model is 20°C; at an air temperature of +30°C, a product with the same temperature is loaded into it. Thus, the final temperature of the product will be 30 – 20 = +10 °C. In addition, it should be noted that the final temperature cannot be lower than the minimum cooling temperature (see Minimum cooling temperature)

The minimum temperature to which the refrigerator is able to cool the product placed in it when operating in cooling mode. It should be taken into account that the minimum cooling temperature is not always achievable in fact: the actual cooling temperature depends on the ambient temperature and on the capacity of the refrigerator for maximum cooling (for more details on the calculation formula, see "Maximum cooling per (°C)"). However, this applies only to refrigerators that are not equipped with compressors (see Compressor); compressor models are able to reach the minimum cooling temperature regardless of external conditions.

— USB for charging gadgets. A standard USB connector from which you can charge a smartphone or other gadget. Note that this function only works if the refrigerator is connected to the mains — car refrigerators do not provide their own batteries, and without an external power source, energy will not be supplied to the USB port.

— Smartphone control. The ability to control the unit from a smartphone or other gadget, usually through a special application. The gadget itself is connected directly wirelessly via Wi-Fi or Bluetooth. This feature provides a number of conveniences. Firstly, it allows you to control the operation of the refrigerator from a distance. Secondly, the application on a smartphone is often more convenient and intuitive than the unit's own control panel. Thirdly, the gadget can receive various notifications from the refrigerator: set settings, current status, notifications about problems, etc. At the same time, control from a smartphone is expensive, which is why it is quite rare, mainly in fairly advanced models.

— Built-in fan. The presence of a fan in the working chamber of the refrigerator. Due to this function, improved air circulation inside the chamber is provided, which contributes to better and more uniform cooling of loaded products.

— Discharge battery protection. An car refrigerato...r with this function, when operating from a car battery (with the engine turned off), constantly monitors the state of the battery. If the charge drops to a critical level, the unit “takes action”: it turns off automatically or gives a signal about the need to turn off. This avoids the complete discharge of the battery and unpleasant situations such as the need to start the engine “from the pusher”.

— Internal illumination. The presence of internal lighting in the working chamber of the refrigerator. This makes it easier to use it in low light conditions — even in complete darkness outside, the contents of the camera can be easily seen.

— Removable cover. Possibility to remove the refrigerator cover from the main container. The meaning and features of this function may be different. So, in some models, the cover is removed only in order to make it easier to get to the contents and to make the working chamber easier to wash / clean. In others, it may be possible to choose the side in which the lid will recline. And some units with this function are equipped with two covers at once: one has a power cord and a cooler, when installed, the device functions as a refrigerator, the second is a simple heat-insulating cover that turns an car refrigerator into a thermos.

— Carrying strap (shoulder). A special strap that allows you to carry the device in the manner of a shoulder bag. Actually, most often it is bag models that are equipped with this function (see "Type"). Anyway, such a strap greatly simplifies transportation: it is more convenient to carry a rather weighty refrigerator on your shoulder, in addition, your hands remain free. There are even models that can be carried like regular backpacks.

— Wheels for transportation. The ability to transport car refrigerators in the manner of a trolley is much more convenient than carrying it in your hands or on your shoulder, especially with large volumes and the appropriate weight of the model.

Own external display. Various service information can be displayed on such a display, such as the temperature inside the working chamber, the operating mode enabled (see "Operating mode"), the battery charge level (see "Battery status control"), etc. The display makes the management of the refrigerator more visual and simple — in particular, it allows you to control the status of the contents of the working chamber without opening it.

The supply voltage for which the car refrigerator is designed. There are several standard options:

— 12 V. Standard on-board voltage for passenger cars, as well as many minibuses and light trucks. Supported by most modern car refrigerators.

— 24 V. Standard voltage of the on-board network of buses, heavy trucks and other large equipment; also found in some SUVs. Car refrigerators “only for 24 V” are practically not produced, usually, such a possibility is provided in addition to 12 V.

— 230 V. Powered by a standard household outlet. It is usually a fallback option in case the refrigerator needs to be turned on outside the car for a while — for example, to pre-cool before a trip. In addition, units with such a power supply can be used as an impromptu replacement for a stationary refrigerator — for example, when leaving for a country house where there is no permanent refrigerator.