Where is copper in the refrigerator: device, diagram and search for non-ferrous metal

The question of where exactly copper is located in a refrigerator most often arises in two cases: when a household appliance has broken down and requires disposal, or when expensive components of the cooling system need to be replaced. Non-ferrous metalscopper and aluminum, such as copper and aluminum, make up a significant part of the cost of scrap, but their removal requires an understanding of the internal structure of the unit. A refrigerator is a complex thermodynamic system, where each element performs its own function, and simply cutting the body will not give the desired result without knowledge of the circuit.

The bulk of copper is concentrated in compressor and the piping system connecting the condenser and evaporator. However, the amount of metal depends on the model year, manufacturer and type of refrigerant. Old Soviet refrigerators and models from the early 2000s contained significantly more copper than modern energy-efficient units, where engineers often replace copper with aluminum to reduce cost and weight. It is important to understand that metal mining remelting is often not economically feasible compared to the cost of the whole device if it is subject to repair.

Before you begin disassembling, you must clearly understand the risks. There is refrigerantlocated within the system that may be flammable or toxic when mixed with air under certain conditions. In addition, improper disposal of freon causes irreparable harm to the environment. In this article, we will analyze in detail the anatomy of the refrigerator, indicate the exact locations of copper and explain why in some models it may not be there at all.

Cooling system design: where to look for metal

The refrigeration cycle is based on the circulation of refrigerant in a closed circuit. This circuit consists of several key nodes, and it is in them that you should look non-ferrous metals. The primary element is the compressor, which is often called the “heart” of the refrigerator. Inside its casing there is an electric motor and a pump group. The motor windings are made of copper wire coated with a varnish insulator. The weight of copper in the windings depends on the power of the motor: in household models it varies from 200 to 500 grams, in industrial models it can reach several kilograms.

The second important source is heat exchangers. Traditionally, they are divided into a condenser (located at the back or built into the side walls) and an evaporator (located inside the chamber or behind the back panel). In classic models released before 2010, the condenser and evaporator tubes were often made of pure copper. It has excellent thermal conductivity and corrosion resistance, which ensures a long service life. However, modern manufacturers are massively switching to aluminum or steel with copper coating, since these materials are cheaper.

The third element is the capillary tube. This is the thinnest pipeline connecting the condenser and evaporator. This is where the sharp drop in refrigerant pressure occurs. In old systems it is copper, in new ones it can be steel. It is also worth paying attention to the filter drier, which often contains small copper elements in the design of the housing or mesh, although its main weight is steel and adsorbent.

⚠️ Attention: When dismantling the cooling system, be sure to follow fire safety measures. Residual compressor oil and refrigerant can be flammable if exposed to an open flame or spark.

Compressor Anatomy: Bulk Source

The compressor is a sealed metal cylinder, usually black in color, located at the lower rear of the refrigerator. To extract copper, it must be dismantled by disconnecting the tubes and electrical contacts. Inside the casing there is electric motorthe rotor and stator of which are wound with copper wire. To get to the metal, the casing is usually sawed with a grinder, although special crushers are used on an industrial scale.

The weight of the copper winding directly depends on the type of compressor. Inverter models may have a more complex winding design, but the total weight of non-ferrous metal in them is comparable to classic linear models of the same power. It is important to note that in addition to windings, copper is used in starting relays and terminal blocks, although their contribution to the total weight scrap metal is insignificant.

The table below shows the approximate copper content in compressors of various capacities, which will help estimate the potential yield of the product:

Why is there less copper in modern compressors?

Modern technologies make it possible to create more efficient windings with less material, and also increase engine efficiency, reducing heat loss.

Pipelines and heat exchangers: evolution of materials

If you look inside an old refrigerator, for example, model ZIL or Biryusa 90s, you can see a massive aluminum evaporator and copper tubes, going to the compressor. At that time, using steel for the cooling circuit was considered a sign of poor quality due to the risk of corrosion and difficulties with soldering. Copper is easily soldered with soft solder, which simplified repairs in service centers.

The situation has changed with the introduction of new standards of environmental friendliness and resource saving. Aluminum is about 3-4 times cheaper than copper and lighter. Modern evaporators are often made of aluminum or even steel sheets with a channel sealed inside (the so-called “crying” evaporator). Rear-mounted capacitors are also often made of steel with an anti-corrosion coating or aluminum. Finding a clean copper tube in a refrigerator manufactured after 2015 is becoming increasingly difficult.

• 🔴 Copper tubes: typical for models before 2005-2010, easy to distinguish by the reddish-red color on the cut and the characteristic ringing.
• ⚪ Aluminum tubes: silver color, easier to bend, but more difficult to solder (require special solder), often break when bent.
• ⚫ Steel tubes: have magnetic properties, coated with black or gray paint, often used in modern budget models.

You can determine the material visually and using a magnet. Copper and aluminum are not magnetic. If the tube is attracted by a magnet, it is ferromagnetic (steel). If it is not magnetic and has a yellow-red tint, it is copper. If it is silver and not magnetic, it is most likely aluminum.

⚠️ Attention: Technical characteristics of materials and piping diagrams may vary depending on the specific model and year of manufacture. Always check the manufacturer's technical documentation if you are planning a major repair.

Differences between old and new models

The evolution of refrigeration equipment is dictated by fierce competition and environmental regulations. In the 80-90s, the main refrigerant was R12 freon, and the tube material was copper. Such refrigerators were “heavy” and contained a lot of metal. The transition to freon R134a, and then to isobutane R600a, required changes in the design. Isobutane, for example, is explosive in high concentrations, so charging the system requires high precision, and the tubes are often made of steel to prevent leaks through micropores that can occur in aluminum over time.

Modern class models A++ or A+++ are designed with recyclability in mind, but with a focus on minimizing the use of expensive resources. Engineers strive to reduce the weight of the unit to reduce transport costs. Therefore, the share of copper in a new refrigerator can be reduced by 40-50% compared to an analogue 20 years ago. The main focus is on the efficiency of heat transfer, and not on the durability of the pipe material, since the estimated service life of the equipment has also been reduced.

Safety precautions during disassembly

Disassembling a refrigerator is a process that requires caution. In addition to the risk of injury from sharp metal edges, there is a danger of poisoning by combustion products of winding insulation or refrigerant vapors. When insulation from copper wires is burned (which is often done by illegal metal collectors), toxic substances are released. Environmental safety dictates the need to hand over the equipment to specialized recycling points, where dismantling is carried out under controlled conditions.

If you decide to disassemble it yourself, use safety glasses and gloves. The compressor is under pressure, so make sure the system is completely depressurized in a well-ventilated area before cutting. Oil from the compressor should not be drained into the sewer or onto the ground - it is a strong pollutant.

Economic aspect: is it worth the candle?

Let's count. The average copper yield from one household refrigerator ranges from 0.3 to 0.7 kg. Even at the high prices of collection points, the cost of this metal will barely cover the cost of transporting the refrigerator to the delivery point and the tools for cutting it. It is much more profitable to hand over the entire refrigerator as scrap ferrous metals (casing) or, if it is working, sell it as used equipment.

In addition, the delivery price often includes a fee for the disposal of harmful components (freon, polystyrene foam, oil). Reception points may accept the refrigerator for free or even require an additional payment if you bring it disassembled, but with residual gas or oil. Therefore, “hunting for copper” in a refrigerator is more of an educational experiment than a business project.

Frequently asked questions (FAQ)

Is it possible to replace copper tubes in a refrigerator with aluminum ones?

Theoretically, it is possible, but this requires special equipment and skills. To connect copper and aluminum, adapters (steel inserts) and argon welding or special rivets are needed, since direct soldering is impossible due to different melting temperatures and electrochemical corrosion. In domestic conditions, it is safer to use original copper tubes.

Why don’t they use copper in new refrigerators?

The main reason is cost. Copper is significantly more expensive than aluminum and steel. In addition, modern technologies make it possible to achieve the required thermal conductivity and reliability using cheaper alloys and composite materials.

How much does copper weigh in a refrigerator compressor?

The weight of copper winding in a household refrigerator compressor usually ranges from 200 to 500 grams. The exact figure depends on engine power and model year. In old Soviet compressors, the output may be higher.

Is it dangerous to open the compressor?

Yes, it is dangerous. Inside the compressor there is oil mixed with refrigerant. When heated (for example, when cutting with a grinder), the remaining gas may ignite. In addition, refrigerant vapors can be toxic. The compressor should only be opened in a ventilated area, away from sources of fire.