Can someone explain to me physically/technically why rooms in which refrigerators and freezers are installed need to be heated?
And what is the technical difference between devices that need at least 16°C and the more expensive ones that only need 10°C?
Wouldn't it also be possible to produce devices that can cope with lower temperatures?
Okay, you can just turn off the refrigerator in the winter. Can it tolerate lower temperatures when turned off? But that's obviously not possible with frozen food. Deep-freeze temperatures are rare in Germany (-; and then you'd have to relocate everything, and then make it animal-proof.
(In Finland we once froze the surplus fish in a pile of snow, but protecting it from animals was a real problem. And at the end of the holiday there was a thaw (after initially -30°C), but still nothing went bad, in the end everything was used up.
(2 rating, 2 votes, rated)You need to be a registered member to rate this.
Loading...
Hello
A refrigerator that didn't work. Despite checking with my boss, I couldn't find a mistake in the refrigerator. It was decided to replace the refrigerator. When we built the refrigerator, we saw a large opening in the open on the wall. The owner had broken this opening so that the refrigerator gets enough fresh air. The opening was closed and the refrigerator was reinstalled. Now there were no problems with the refrigerator.
In the case of refrigerators with an ice compartment, in particular with freezers, the ambient temperature of the installation site specified by the manufacturer is specified as: Climate class to take into account:
Climate class SN (Subnormal)
ambient temperatures from +10 °C to +32 °C
Climate class N (Normal)
ambient temperatures from +16 °C to +32 °C
Climate class ST (Subtropics)
ambient temperatures from +18 °C to +38 °C
with this class, a device may consume 10% more energy than the normal class to obtain the same energy label (eg A++)
Climate class T (tropics)
ambient temperatures from +18 °C to +43 °C
with this class, a device may consume 20% more energy than the normal class to obtain the same energy label (eg A++)
While a low ambient temperature of the site initially helps to save energy, – apparently paradoxically – the lowering of the minimum temperature leads to thawing in the ice/low cooling compartment. This depends on the fact that the cooling chamber and the freezers usually have a common compressor which is regulated by a thermostat in the cooling chamber. At a low outside temperature, for example 8° C., the compressor has to run only rarely in order to ensure, for example, a temperature of 6° C. in the cooling chamber. This activity of the compressor is not sufficient to counter the significantly greater difference ( Heat flow ) to operate between the outside temperature and the temperature in the freezer compartment, for example −18 °C. Apart from this, lubricants in the compressor can become too viscous below the minimum operating temperature.
Coolers of the climate class SN therefore often have a heating near the thermostat in the cooling room of about 8 watts. Sometimes the incandescent lamp (usually: 15 watts) is simply not switched off to expand the operating temperature from the climate class N to SN. [document?]
If you want to save energy and set up a refrigeration appliance in an unheated room where permanent temperatures below 10 °C are also to be expected, you better opt for a cooling/freezer combination and for a separate refrigerator and freezer or even better for a freezer. Recently, more and more small cooling and freezing cells have been used in private households. For commercial users there are some other cooling devices such as eg wall cooling shelves (for presentation of mainly packaged foods), freezers, beer cooling etc.
o Every techn. device has an operating temperature range,
in which it should work easily (see data sheet
or operating instructions). Outside these
temperature range can lead to malfunctions and
Defects occur because components or assemblies
for this temp. are not stable.
But at the technical level. Data is not just the temp.
important, but also other environments.
as well as storage and transport conditions.
> relative Moisture (due to condensation problems)
-> dry site.
-> no direct sunlight
-> no aggressive/corrosive media
-> max. vibration/strain loads
-> Voltage/frequency
This has nothing to do with the fact that, of course, the cooling effect
at low temp. is better than at higher temp.
How does “cooling” work? The refrigerator or freezer has a temperature sensor in the thermostat. The thermostat has been set by the manufacturer with switch-on and switch-off points for certain temperatures in the cooling chamber. When a certain temperature (the switch-on temperature) is exceeded in the cooling chamber the the compressor is automatically brought to “running” and the cooling or freezing device is again cooled to “operating temperature”. The optimum temperature is always reached within a certain, constant time. When the temperature is reached, the compressor switches off automatically. This process takes place at regular intervals. Thus, the cooling device works when it is in the optimal ambient temperature.
Cooling or freezing equipment of the climate class SN needs a continuous “heat supply” so that the cooling or freezing device “thinks” it stands warmer. In this way, it is possible to set up SN devices even at an ambient temperature of at least 10° C. This is achieved by additionally installing a small heater on the thermostat. Or, it is not necessary for SN – refrigerators to ask: “Does the light in the closed refrigerator?”. Yes, because in SN – refrigerators without heating, the light also burns in a closed refrigerator to give enough heat.
What happens when the refrigerator or freezing device is set up in a colder room? The ambient temperature always acts on the cooling chamber. not enough “warm” which would trigger the cooling process. The “non-cooling times” stretch out. When the compressor jumps on, it works as long as it would otherwise work. This leads to the temperature in the cooling chamber rising in the long term. It is therefore warmer in the cooling chamber because the compressor would have to work longer to achieve the optimum temperature again, but does not. In a freezer, for example, the freeze material then emerges. If one attempts to counteract this action by adjusting the controller, one can achieve a partial success. The temperature then drops with increasing energy consumption. In a refrigerator with freezer compartment, this can also lead to freezing in the refrigerator. But a “cold” location of the refrigerator or freezer leads over short or long to the fact that the lubricant in the compressor changes its properties and thereby damages the cooling or freezer as a whole (cooling power loss).
It is therefore extremely important that refrigerators and freezers are always set up in the ambient temperature of their climate class. For the climate classes SN, N, ST and T, this is usually the kitchen. Rooms such as basement or other unheated rooms and frost-prone floors usually do not fall below
Greetings HobbyTfz
Thanks for the star
Hello!
Such devices usually stand in kitchens and occasionally also in cellar rooms.
At least one room temperature of about 15° C. should prevail.
But this has more to do with the "fool" prevention.
And thus, "actually" the temperature ranges mentioned by you are unnecessary.
However, if such devices are in an unheated garage or a shed, you should pay attention to such operating temperatures.
In particular, at greater temperature deviations downward…
So that the technology does not damage.
Greeting
Martin
Heat pump works in refrigerators and freezers. The heat from the inside is transported to the outside. The more stable their temperature environment in which they work, the more efficient they can be optimized.
Refrigerators with low power consumption are desired by the consumer and most simply place their refrigerator in a normal ~20°C warm apartment.
So manufacturers are optimizing this environment with the limitation that they can no longer work efficiently or at all outside their parameters.
The refrigerator does not damage if it is disabled in colder environments. But if the ambient temperature is specified, you should also keep it in operation to avoid risking any damage that would not be able to secure.
Hi!
Who says the rooms have to be heated. You can leave your kitchen as cold as you want. No man forces you to a heater.
Your headline doesn't just fit a question. Rooms in which heating is not heated to 90%. The 10% are rooms that were previously used elsewhere. We have a freezer and a chest in the HWR (12m2) for brand new heating. It's cuddly warm. Which is why the door is often open, which was never planned.
In our 2, house the heating is in the cellar itself, because this is about to warm up the significantly larger space and there are no doors.
The freezer in front of the garden block house also has no heating. And that was also heated by the GF.
Your question text
Since when does heating/refrigerators/freezers need heat? They give them away.
And
Finland, nothing new. only you don't have the option here.
Yes, but this only applies to cheaper freezer combinations. Individual refrigerators or individual freezers do not have the problem. Similarly, the problem does not apply to more expensive two-circuit combiners.
In single-circuit devices there is only one cooling circuit with a compressor which cools down both the freezer unit and the refrigerator. As soon as the refrigerator starts, the frozen part is also cooled and vice versa.
Let's assume that the refrigerator has a target temperature of 4°C and the ambient temperature would also be 4°C. Then the refrigerator would never start. However, the frozen part is then no longer cooled and heated. If the cooling circuit were to be regulated according to the need of the freezer, the compressor would have to start, but then it would also cool off the refrigerator and it would possibly be cooled below 0° and iron everything inside.
The whole thing is a purely technical problem that does not occur when the space in which the combination stands is warm enough. Then it doesn't matter whether the frozen part or the refrigerator needs more cold. As soon as the compressor starts, both parts are cooled sufficiently.
As stated, the problem does not occur in individual devices and in combination devices with two separate cooling circuits does not occur. They're pretty expensive.