Many owners of household appliances think about the internal design of the units only at the time of breakdown or when planning to dispose of old equipment. The question of what exactly is in a copper refrigerator often arises among those who are trying to estimate the cost of non-ferrous metal when disposing of equipment for scrap, or among craftsmen involved in the restoration of cooling systems. Indeed, copper is one of the key materials in the production of refrigeration equipment due to its unique heat-conducting properties.
However, it will not be possible to find it in its pure form in the form of massive sheets or solid parts, as in transformers. In modern and old models copper elements distributed throughout the refrigerant circulation system and electrical circuit. Understanding exactly where these components are located will help not only to assess the secondary value of the device, but also to better navigate when diagnosing malfunctions associated with freon leakage or clogged capillary system.
It is important to immediately note that the amount of non-ferrous metal directly depends on the year of manufacture and model of the unit. Soviet refrigerators, such as ZIL or Saratovwere significantly richer in non-ferrous metals than modern energy-efficient models, where engineers are actively replacing copper with aluminum to reduce costs. However, it is impossible to imagine the functioning of any compression refrigerator without this metal.
The role of copper in the cooling system
The main purpose of copper in the refrigeration circuit is effective heat exchange. The material has one of the highest thermal conductivities among base metals, which allows it to quickly remove heat from the chambers and release it into the environment. This is why heat exchange tubes coils are traditionally made from this metal. Unlike steel or aluminum, copper is more ductile, which allows complex bends to be formed without the risk of cracks due to vibration.
In addition, copper is resistant to corrosion within the system if high-quality refrigerant and oil circulate in it. This is critical for durability refrigeration circuit. If the tubes were made of a less inert metal, oxidation products would quickly clog the thinnest channels of the capillary system, rendering the unit inoperable. Therefore, manufacturers strive to preserve copper in critical components, even saving on other parts.
There is a misconception that the entire heat exchanger must be copper. In practice this is not the case. You can often find combined solutions where copper is connected to aluminum through special adapters. This solution reduces the overall cost of the device, but requires high qualifications during repairs, since soldering dissimilar metals is a complex process that requires the use of special fluxes and solders.
⚠️ Attention: When trying to independently extract copper from a working or recently used refrigerator, there is a risk of poisoning by refrigerant vapors or getting an oil burn. The systems are under pressure, and breaking the seal without special equipment is dangerous.
Evaporator and condenser: main locations
If you are looking for where the most metal is in a copper refrigerator, then first of all you should pay attention to the evaporator and condenser. In classic models with an open or partially hidden rear radiator (condenser), the black grille is often made of steel tubing, but the internal connections and inlet/outlet pipes can be copper. However, the "gold mine" for copper tubes is the evaporator.
In older models, the evaporator was often a copper coil cast into an aluminum plate or located openly in the freezer. In modern systems No Frost the situation is different. It uses an evaporator consisting of copper tubes and aluminum plates. Copper is used here specifically for the tubes through which freon circulates, as it better withstands temperature changes and pressure.
- 🔹 Evaporator tubes: Located inside the freezer or behind a plastic panel, in direct contact with the refrigerant.
- 🔹 Condenser pipes: Inlet and outlet from the black radiator on the back the wall is often made of copper for ease of soldering during assembly.
- 🔹 Capillary tube: The thinnest copper conductor that regulates the pressure in the system, often wound on the return line.
It is important to understand that in modern budget models Manufacturers can replace copper evaporator tubes with aluminum or steel with an anti-corrosion coating. This is done to reduce the cost of the design. Therefore, when disassembling a specific instance, you may encounter a situation where the expected copper is not there. It is always worth checking the technical documentation or visually assessing the color of the metal on the cut (copper has a characteristic reddish-pink tint).
Compressor: hidden reserves of non-ferrous metal
The heart of the refrigerator - the compressor - also contains copper, but getting to it is extremely difficult without completely destroying the unit. Inside the sealed casing there is an electric motor, the windings of which are made of copper wire. It is these windings that create a magnetic field that rotates the rotor and sets the piston group in motion.
The amount of copper in the windings depends on the power of the compressor. For household refrigerators, this is usually from 300 to 600 grams of pure metal. However, it can only be removed by sawing the steel body, which at home requires the use of an angle grinder and significant physical effort. In addition, there is oil inside the compressor, which splashes when cut.
In addition to the windings, the compressor has copper suction and discharge pipes that go outside. They serve to connect to the main circuit of the system. These external parts are easily accessible, but their weight is insignificant - only a few tens of grams. The main value is the internal stator winding.
Is it possible to restore a burnt-out compressor?
Restoring a burnt-out compressor by rewinding at home is almost impossible. Special equipment is required to wind the coils, balance the rotor and evacuate the system. It is easier and cheaper to replace the entire unit with a new one or a contract one.
Electrical wiring and additional components
In addition to the cooling system, copper is widely used in the electrical part of the refrigerator. The wiring connecting the thermostats, sensors, lighting lamp and start relay is made of copper conductors. Although the cross-section of these wires is small, in total a noticeable amount of metal can accumulate throughout the entire unit.
Particular attention should be paid to the starting relay and thermostat. Inside starting relay there is a coil that also contains copper. In some older models of thermostats, the capillary tube filled with gas or liquid could be copper, although brass or steel was more often used. Modern electronic sensors (thermistors) contain a minimum of non-ferrous metals.
- 🔹 Connecting wires: Harnesses going to the door and lamp.
- 🔹 Relay windings: Electromagnetic coils in the starting devices.
- 🔹 Contact: Electrical connectors and switches often use tinned copper or alloys based on it.
When disassembling the electronics (if they are placed in a separate unit, as in some Side-by-Side models), you can find printed circuit boards. They contain microscopic amounts of copper in the tracks, but extracting it from there at home is unprofitable and environmentally hazardous due to the use of acids.
Comparison of copper content in different models
The copper content in the refrigerator varies greatly. To better understand which models should be considered as a potential source of non-ferrous metal and which should not, it is useful to compare different types of units. Below is a table showing the approximate distribution of copper.
| Refrigerator type | Approximate weight of copper (kg) | Main locations | Probability of presence |
|---|---|---|---|
| Soviet (ZIL, Saratov) | 1.5 - 2.5 kg | Evaporator, condenser, compressor | High (almost 100%) |
| Modern No Frost (budget) | 0.3 - 0.7 kg | Compressor, partially evaporator | Medium (often aluminum) |
| Modern No Frost (premium) | 0.8 - 1.2 kg | Copper evaporator tubes, compressor | High |
| Display refrigerator | 2.0 - 4.0 kg | Powerful heat exchanger, large tubes | Very high |
The table shows that old Soviet models and professional commercial equipment are of greatest interest. They used thick-walled copper tubes and massive heat exchangers. Modern household models strive for minimalism, using thin-walled tubes and replacing metal where technology allows.
⚠️ Attention: The data in the table are averages. The actual amount of metal depends on the specific brand, year of manufacture and engineering solutions of the manufacturing plant. Models may change design without notice.
How to determine the material of tubes without disassembly
Before starting disassembly, many want to understand what they are dealing with. There are several indirect signs. First, pay attention to the weight of the unit. Heavy older models are more likely to contain copper. Secondly, if the radiator is visible from the back, take a closer look at the color of the tubes leading to it from the compressor. If they are reddish, it is copper. If they are silver, it is most likely steel or aluminum.
You can also use a magnet. Copper and aluminum are non-magnetic, meaning a magnet will not stick to them. Steel and iron have ferromagnetic properties. By passing a magnet along accessible tubes (for example, at the outlet of a compressor), you can immediately understand the material. However, remember that the tubes can be coated with paint or varnish, which makes it difficult to visually assess the color, but does not affect the magnetic properties.
☑️ Checking for the presence of copper
Environmental aspects and disposal
Scrapping refrigerators is not only a way to earn some money, but also an important environmental step. Refrigeration equipment contains not only valuable metals, but also hazardous substances. Refrigerants, even if they are not ozone-depleting CFCs, can be harmful when released into the atmosphere. Oils that permeate the system also require special disposal.
Modern recycling plants are equipped with equipment that safely extracts freon and separates plastic, steel, copper and aluminum. Handicraft dismantling in garages often causes soil and air pollution. Therefore, if the goal of obtaining copper is profit, it is worth weighing the cost of time and effort against the cost of delivering the entire unit to a specialized collection point.
In addition, when burning wire insulation or plastic parts to release copper, toxic substances are released, including dioxins. This is strictly prohibited and dangerous to health. Environmental responsibility must come before the short-term benefit from receiving a little more metal.
Frequently asked questions (FAQ)
How much approximately can a kilogram of copper be obtained from one old refrigerator?
From a Soviet refrigerator you can get from 1.5 to 2.5 kg of copper if you completely disassemble it, including the compressor. From modern - usually no more than 0.5-0.8 kg, since manufacturers are actively replacing copper with aluminum.
Is it possible to solder copper tubes of a refrigerator with ordinary tin?
No, to solder copper tubes in the refrigeration circuit, where freon circulates under pressure, you need hard solder (silver or copper-phosphorus) and high temperature. Ordinary tin solder will not withstand pressure and vibration.
Why is there less copper in new refrigerators?
This is due to the desire of manufacturers to reduce the cost of the final product. Aluminum is cheaper and lighter, and modern technologies allow it to be used effectively in heat exchangers, although copper is still considered a more durable material.
Is copper from the refrigerator dangerous for reuse?
Copper itself is safe. However, the inside of the tubes may be contaminated with oil breakdown products or refrigerant residues. Before reusing them for other purposes (not related to refrigeration), it is recommended to thoroughly rinse and blow them out.