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Refrigerators
Does the light really go out when we close the door? From the early icebox to the modern built-in frost-free stainless steel double door works of art, refrigerators have improved greatly over the years, and we seldom think about them until they don't work right. From cleaning methods to repairs, this category is the place to get advice and answers to your questions about refrigerators.
3,286 Questions
Yes, storing food in a colder refrigerator will help prevent bacterial growth and slow down food spoilage. However, extremely cold temperatures can affect the texture and flavor of certain foods, so it's important to find a balance that keeps food safe without compromising quality.
Should refrigerants be operated at temperatures above or below their critical temperature?
The critical temperature of a refrigerant is the point at which it changes states. In a refrigeration scenario, this happens 2 times per cycle. The refrigerant is a liquid on the high pressure side, and below its critical temp. On the low pressure side it becomes a vapor (gas) and its above its crictal temp.
So the answer is both, depending on what side of the system you are on.
The work done in lifting the refrigerator can be calculated by multiplying the force applied (700 N) by the distance traveled (4 meters). Therefore, the work done would be 700 N * 4 meters = 2800 joules.
A refrigerator does not cool the food inside it properly if the food is too tightly packed?
When food is tightly packed in a refrigerator, the airflow is restricted, making it difficult for the cold air to circulate evenly. This can lead to uneven cooling and pockets of warm air where food may spoil faster. To ensure proper cooling, it's important to leave space between items for air to flow freely.
Define flash gas and how it applies to the net refrigeration effect of the refrigeration cycle?
FLASH GAS - Instantaneous evaporation of some liquid refrigerant at the metering device due to pressure drop which cools the remaining liquid refrigerant to desired evaporation temperature.This flash gas cannot absorb any heat having a negative effect on the net refrigeration cycle
Do the refrigerator get the heat out or cool in?
Refrigerators remove heat from inside the unit and expel it outside in order to cool the interior. This process is facilitated by the refrigeration cycle, where refrigerant absorbs heat inside the fridge and releases it outside, keeping the interior cool.
Why does your arm feel cold when you reach inside the refrigerator to get a container of milk?
When you reach inside the refrigerator, the cold air inside the refrigerator comes into contact with your arm. Your arm loses heat to the colder air, resulting in the sensation of coldness. Additionally, metal shelving and drawers inside the refrigerator can conduct the cold temperature and contribute to the overall sensation of coldness on your skin.
Why did Albert Einstein invent the refrigerator?
Albert Einstein co-invented with Szilárd Leó a new type of refrigeration unit that received 45 patents and it had no moving parts, so it it could not leak toxic gasses from faulty seals. He was inspired by a newspaper article about a family in Berlin who had died from inhaling toxic fumes from a refrigerator leaking it’s refrigerant.
How do you messure refrigerator inside?
To measure the inside of a refrigerator, use a tape measure to measure the width, height, and depth of the interior compartment. Make sure to measure from the farthest points inside the refrigerator, including any shelves or drawers that may impact the available space. These measurements will help you determine the storage capacity and plan for organizing items inside the refrigerator.
What does the Q represent in the COP equation for a refrigerator?
The Q represents the heat absorbed in the evaporator of the refrigerator. It is a critical component in the Coefficient of Performance (COP) equation, which helps quantify the efficiency of the refrigerator in terms of how much cooling it generates relative to the amount of work input.
Both an A/C unit and a fridge pump heat from one area into another. In the A/C unit the heat is pumped out of the room and into a discharge area, normally the outside atmosphere, thus the room is cooled, wheras for a fridge the heat is pumped from inside the fridge out into the room, thus the inside of the fridge is cooled and the room is warmed. The only difference between the working of the two is that the "room" is a different side of the heat pump.
Is a Refrigerator magnet a Permanent magnet?
No, a refrigerator magnet is not a permanent magnet. Refrigerator magnets are usually made of soft magnetic materials that become temporarily magnetized when in the presence of a magnetic field, allowing them to stick to the refrigerator. Permanent magnets, on the other hand, retain their magnetization over time without the need for an external magnetic field.
Why are white shiny surfaces suitable for a fridge or freezer?
White shiny surfaces are suitable for a fridge or freezer because they are reflective, which helps to retain cool temperatures by reflecting heat away. This can help the appliance maintain a consistent internal temperature and reduce energy consumption. Additionally, white shiny surfaces make it easier to spot dirt or spills and keep the exterior looking clean.
What is the difference between bleach and Clorox?
Bleach is a general term for a chemical used for whitening, disinfecting, and cleaning, while Clorox is a brand of bleach manufactured by The Clorox Company. Clorox products often contain sodium hypochlorite as the active ingredient, which is a type of bleach.
Does a refrigerator produce heat?
Yes, a refrigerator does produce heat as part of its cooling process. The heat is generated as the refrigerant inside the refrigerator absorbs and removes heat from the interior, releasing it outside through the condenser coils.
The gas inside the tubes loses thermal energy through the process of condensation. As it moves from high pressure to low pressure areas, it releases heat energy and condenses into a liquid, which then evaporates back into a gas in another part of the system. This cycle of condensation and evaporation helps to cool the refrigerator.
On what scale would you measure the number of degrees Fahrenheit to keep a refrigerator cool?
The temperature range for keeping a refrigerator cool is typically between 35-38 degrees Fahrenheit. This range can be measured on a Fahrenheit scale using a thermometer placed inside the refrigerator.
Why does jam not spoil when left outside the refrigerator?
because the jam is heat treated before sealed and so has no microbes on it, even when you open it the high amount of sugar dries out the microbes, which then kills them (see below)
the sugar is a solute and the jam is the solution. also jam is viscous so it slows them down while the sugar kills them
Condensor
This force helps to hold things to fridge doors?
The force that helps hold things to fridge doors is magnetism. Magnets on the fridge door create a magnetic field that attracts ferromagnetic materials like iron or steel, allowing items like magnets, notes, or photos to stick to the surface.
Why are the cooling fins of the refrigerator painted black?
The cooling fins of a refrigerator are painted black to improve heat transfer efficiency. Black color absorbs more heat than lighter colors, helping the fins dissipate heat more effectively. This process enhances the overall cooling performance of the refrigerator.
What chemicals are in a refrigerator?
Refrigerators typically use refrigerants such as hydrofluorocarbons (HFCs) or hydrochlorofluorocarbons (HCFCs) as the primary cooling agents, along with other chemicals like lubricants and insulation materials. Some older refrigerators may contain chlorofluorocarbons (CFCs), which have been phased out due to their harmful effects on the ozone layer.
Why and how was the refrigerator invented?
The refrigerator was invented to preserve food and extend its shelf life. The first practical refrigerator was invented in 1876 by Carl von Linde, who used a compressor to cool air and create a refrigeration cycle. This invention revolutionized food storage and changed the way people preserved perishable goods.
How does solar powered refrigerator work?
A solar-powered refrigerator works by using solar panels to convert sunlight into electricity, which is then stored in batteries. This stored electricity powers the refrigerator's compressor and cooling system, allowing it to maintain low temperatures inside the fridge without requiring a connection to the electrical grid.
How does the compressor in a fridge work?
There are many differant types of compressors, so il keep it as simple as I can. the compressor is the heart of the refrigeration system. It is 1 of the 4 main components in a system. It is 1 of the 2 pressure changes in the system, the other being the metering device (many of them as well). refrigerant is sucted from the suction line/pipe into the compressor. once it is in the compressor it is then compressed depending on what type of compressor it is (I will explain a few lower) from a cold low presure refrigerant into a high presure hot refrigerant. can you deduct from that what the purpose of a metering device is? After the frigerant has been compressed it is sent to the condensor coil to be (you got it) condensed. Much like the rain cycle. I would go on but this is to just cover the compressor. The compressor not only keeps the refrigerant moving throughout the hole system it also creates a pressure change. why raise the temperature in a machine that is designed to keep this cool? (I will leave you with that because thats a hole new chapter to expand on) I will give a breif description on how some of the many compressors work. There are 3 catagories of each type of compressor. Hermetique, semi-hermetique and open (or belt driven from a seperate motor).These are the most commonly found compressors.
1.reciprocating - Using pistons to compress the refrigerant. as the piston goes down it creates a vacuum opening up to the suction line sucking the refrigerant in until the piston is as far down on its stroke as it can. on the up stroke of the piston it creates a positive pressure pushing the reed (flap over a cylinder head) open pushing the refrigerant into the next cylinder chamber or out into the discharge line. It comes in all three types and used over a wide range of refrigeration feilds.
rotary - The rotary compressors have two rotating elements, like gears, between which the refrigerant is compressed. These compressors can pump the refrigerant to lower or moderate condensing pressures. Since they can handle small volume of the gas and produce lesser pressure, they are used in fewer applications. Mostly semi types.
screw - The screw compressors comprise of a pair of meshing screws between which the refrigerant gets compressed. They can produce high pressure for small quantity of gas. They consume less power than the reciprocating compressors and are being used widely. Usually because of its size and noise they are rarely used for domestic applications.
centrifugal - The centrifugal compressors comprise of the impeller or the blower. As the impeller rotates at very high speed into a volute casing (diffuser) causing a negative pressure (differant to all the others) They can handle large quantities of gas but at relatively lower condensing pressure. Used more for chillers and very big systems (skyscapers) and take a lot of power on start up.
scroll -The scroll compressor comprises of two interleaved scrolls of which one is fixed and the other orbits eccentrically without rotating. During its motion small gaps are created between the scrolls where the refrigerant gets compressed. The scrolls can have different shapes like involute, Archimedean spiral or hybrid curve. In another arrangement both the scrolls may be rotating eccentrically to produce the compression.
