Something you use every day, you think you know it well, but in fact you do not understand its real heart.People may say, 'Why do I have to understand it', but in fact if you can deepen understanding of it, perhaps Will make your quality of life to a higher level.
For example, the big guy we see every day when we enter the kitchen - the refrigerator, has a big appetite and can freeze the ingredients we want to keep for a few days, but how does it work? How to choose a refrigerator daily home, we are always ambiguous these problems.Next, PConline will collect some time for the refrigerator on the show, and provide a relatively objective answer for your netizen reference.
The core of the refrigerator and working principle is what
Refrigeration systems include refrigerants, compressors, throttling elements, evaporators, condensers, gas-liquid separators and drying filters.
R600A is currently one of the most widely used refrigerant refrigerants, with a large latent heat of vaporization, small flow resistance, good environmental performance and low production cost.
Compressor and throttling components bear the task of generating and maintaining high-pressure zone and low-pressure zone, respectively, to provide suitable pressure conditions for the condensation and evaporation of the refrigerant.Evaporator and condenser are collectively referred to as heat exchangers. The use of plate evaporator, the use of tube-type or inflatable freezing chamber evaporator.Freeze-cooled refrigerators are mostly fin-type evaporator.The condenser is mainly box wall.
The refrigerant in the heat exchanger is in a two-phase mixed state, and the gas-liquid separator is located between the evaporator and the return air pipe to prevent the refrigerant that has not been completely evaporated from striking the compressor, and the drying filter is placed on the front end of the capillary tube to filter out Impurities and moisture, to avoid pipe plugging or corrosion.
The cabinet includes the bottom plate, the side plate, the back plate, the horizontal (vertical) beam, the heat insulation layer, the inner liner, etc. The door body is mainly composed of a panel, an insulation layer, a lining, a door seal and a handle. Rigid foam is used as thermal insulation material.Isocyanurate (black material) and combined polyether (white material) are mixed according to a certain proportion and then injected into the box (door) body sandwich to form a foam layer through a series of chemical reactions.
Among them, the combination polyether is made up of foaming agent, catalyst, foaming agent, deionized water and polyether polyol, usually cyclopentane or pentafluoropropane (HFC-245fa) Honeywell Solstice LBA as the fourth generation of hydrofluoroolefin (HFO) blowing agent has better thermal insulation than the mainstream products and other physical properties, there are examples of applications in domestic refrigerators.
Refrigerator effective volume how to choose?
Under the premise of space permit, reference to 100 ~ 150L / person's standard, combined with home cooking habits, to determine the appropriate volume.
Note: The refrigerator costs less than 3,000 yuan strong constraint, there is the quality and volume of the trade-off issues. It is recommended to give priority to the performance of the machine and work materials.
Refrigerator door structure how to choose?
According to the different structure of the door, the refrigerator can be divided into single door, two doors, three doors, the door and multiple doors (including the cross to open the door).
Single-door refrigerator is generally freezers or refrigerators, suitable for renting, office use, or as a supplement to the main refrigerator.
The two refrigerators are generally refrigerated + under freezing, most of the capacity does not exceed 350L, most of the width does not exceed 600mm.
Three refrigerators in the door on the basis of two additional soft door freezer, freezer or change greenhouse, of which the most practical greenhouse. Two and three refrigerators suitable for reserving width is limited, often to buy fresh food family .
On the refrigerator door is generally left and right freezer refrigeration, the effective volume is more than 400L, the width of more than 800mm. On the refrigerator is the first choice for cost-effective large-capacity refrigerator, suitable for like the appearance of the atmosphere, accustomed to hoarding food family.
Cross on the refrigerator door to the upper refrigerator door, the lower left and right rooms, symmetrical structure, clear partition, suitable for stable appearance, rich variety of ingredients for the family.
French multi-door refrigerator on the upper door to the refrigerator, the lower is a straight pull drawer, the body width is moderate, plenty of horizontal space, suitable for storage efficiency, variety of ingredients family.
Japanese-style multi-door refrigerator on the upper door or single-door refrigerator room, the bottom of a number of drawers, including two small drawers for the ice-making room and quick-freezing room, two large drawers were frozen room and fruit and vegetable room. High moisturizing and anti-condensation design The quick-freezing chamber is equipped with aluminum plate to quickly pass fish and meat through the largest ice crystal to keep the fresh flavor.The Japanese-style multi-door refrigerator is suitable for families with balanced diet and high consumption of fruits and vegetables.
Refrigerator direct cooling and air cooling how to choose?
The feature of the direct cooling refrigerator is that the evaporator absorbs heat directly in contact with the compartment chamber or air.
Advantage:
① high relative humidity freezer.
② independent of each room, will not smell.
③ simple structure, low prices.
Disadvantages:
① freezer to manually defrost.
② The larger the volume, the lower the cooling efficiency, the more uneven the temperature distribution, the greater the fluctuation.
Note: Some refrigerators in direct-cooling refrigerators or mixed refrigerators are equipped with fans to accelerate the air flow in the compartments to increase the cooling rate and to improve the uneven temperature distribution.
③ water vapor makes the ingredients easily sticking some ingredients (such as dry goods) is not suitable for storage in high humidity environment.
④ Direct cold refrigerator mostly low-end products.
Air-cooled (also known as 'intercooled') The refrigerator uses a fan to deliver air to an evaporator compartment hidden in the backplate, absorbing heat and returning it to the compartment. This is repeated.
Advantage:
① automatic defrosting.
② cooling speed, temperature distribution, small fluctuations.
Disadvantages:
① easy to take away food moisture.
Note: Air-cooled refrigerator through the optimization of air duct, set independent fruit and vegetable drawers, built-in moisturizing film and other measures can effectively reduce the water loss of ingredients to extend the preservation cycle.
② There is obvious wind noise.
Straight cold (also known as 'mixed cold') refrigerator freezer for the direct cooling, freezer air-cooled.
Advantage:
① high relative humidity freezer.
② freezer automatic defrosting.
Disadvantages:
① high volume mixed cold refrigerator manufacturing costs, expensive, little choice.
The larger the freezer volume, low cooling efficiency, the more serious the uneven temperature.
Purchase advice:
In general, the budget is less than 1,500 yuan, may wish to consider direct cooling two or three refrigerators.Otherwise, it is recommended to choose the mainstream of the air-cooled refrigerator.Ample budget can also consider Bosch / Siemens or Liebherr mixed refrigerator.
Refrigerator cycle and multi-cycle how to choose?
Most direct refrigerators for a single cycle.Refrigerator and freezer evaporator series, can not be independent temperature control.A few straight refrigerator for double loop, freezer and freezer evaporator in parallel, independent temperature control.
Single-cycle air-cooled refrigerator has only one set of evaporators. The air in the storage room is sent to the vicinity of the evaporator for heat exchange, and the cold air is distributed by controlling the air-conditioning.
Multi-cycle refrigerator is divided into two types:
The first is multi-evaporator multi-cycle, the second is a dual compressor multi-cycle.
The multi-evaporator multi-cycle configuration features two or three evaporators that form two or three separate refrigeration cycles that are in-line with each other because of the evaporator on both the freezer compartment and the freezer compartment.
Multi-cycle double compressor is common in Liebherr, Sub-Zero and other high-end refrigerators, generally large-capacity combined or multi-door structure.Refrigeration zone and freezer zone completely independent, for different ingredients customized temperature and humidity environment.
Purchase advice:
For refrigerators equipped with inverter compressor and inverter fan, the benefits of multi-cycle to temperature control and moisturizing are limited at the expense of increased manufacturing costs and more internal space, so most air-cooled refrigerators choose a single-cycle configuration, Only part of the high-end refrigerators with multi-cycle structure.There are many technical means to enhance the refrigerator capacity, multi-cycle is not the only way.
The actual freshness of a refrigerator depends on the design of the system, and the multi-cycle configuration does have its natural advantage in preventing odor in different compartments. However, single-cycle refrigerators also utilize the electric damper and the net odor device to solve this problem well. In summary, do not have to tangle single cycle and multi cycle in the end what better.
Frequency refrigerator and inverter refrigerator should be how to choose?
Although there is a view that the 'election refrigerator frequency conversion or frequency conversion does not make sense.' The reason for holding this view is: buy inverter refrigerator (compared to buy fixed-frequency refrigerator) spend enough money for several years. It does not make any sense to buy an energy-efficient air conditioner, but such a view is untenable.
First of all, there are no two refrigerators except for the difference between fixed frequency and variable frequency, and the rest are completely homogenous.It is unreasonable to simply explain the reason of the refrigerator price difference to frequency conversion and frequency fixing.
Second, power-saving is just one of the many additional features of variable-frequency technology, which eliminates the need to start and stop compressors as long as they are uninterruptible and eliminates the need to repeatedly build pressure differentials in the refrigeration cycle, resulting in higher operating efficiency and lower noise (usually). Coupled with the compressor speed can be adjusted freezer refrigeration capacity and load balance, room temperature fluctuations smaller.
Finally, with the gradual maturation of frequency conversion technology, low-cost frequency refrigerators become more common, and frequency-set refrigerators gradually lose their price advantage.
Purchase advice:
Budgets of less than 2,500 yuan, greater capacity requirements, less demanding on the preservation of children's shoes can be considered frequency refrigerator, or inverter is the default option refrigerator.