Re-equipping old household appliances is not only a way to save money, but also an excellent opportunity to show engineering ingenuity. Old refrigerator, which has long ceased to keep cold or is out of order, does not have to be scrapped. Its body is a sealed, thermally insulated chamber, ideal for creating drying cabinet. Unlike conventional dryers, this design allows you to dry things even in damp basements or garages, where conventional drying takes too much time.
The main advantage of the conversion is the availability of a ready-made one. thermal insulation. The walls of the refrigerator are made of polyurethane foam or polystyrene foam, which allows you to retain heat inside and not heat the outside environment. This is especially important if you plan to use electric heating elements. In addition, the vertical shape of the body provides natural air draft, which accelerates the process of evaporation of moisture from fabrics.
In this article we will analyze in detail all stages of transformation: from dismantling internal components to installing a ventilation system. Safety when working with electricity and heating devices comes first, so we will pay attention to special attention to correct connection and temperature conditions. You will receive a durable device that will last for many years.
Preparing the case and dismantling the equipment
The first step is to completely free up the internal space. You will need to remove all removable shelves, drawers, egg trays and bottle holders. If the shelves are made of glass or plastic, it is better to put them aside - they can be useful for other household needs or can be used as additional grilles inside the dryer if they can withstand the temperature.
Next follows the most time-consuming part - removing the compressor, condenser and evaporator. Refrigerantwhich is located in the tubes must be vented in a well-ventilated area indoors, preferably outdoors. Old refrigerators may contain freon, which is harmful to the ozone layer, so simply cutting the tubes is not a good idea. Carefully file away the copper tube at the back of the unit, let the gas escape and only then proceed with dismantling.
- 🛠️ Disconnect the compressor by unscrewing the mounting bolts and cutting the supply wires.
- 🧹 Carefully wash the inner chamber using disinfectants to remove odors.
- 🔌 Remove the old wiring, thermostat and light bulb if they are not going to be reused.
⚠️ Attention: When removing the evaporator (often this is a plate on the back wall inside the chamber), proceed with caution. In older models it may be frozen into the wall. Do not use force so as not to damage the internal plastic liner of the refrigerator.
After removing all technical components, the inside of the refrigerator is an empty box. Wipe all surfaces thoroughly with a dry cloth. If there is a tray left at the bottom to collect condensate, it can be left or removed depending on your idea of installing heating elements below.
Organization of the ventilation and airflow system
Quality air circulation is the heart of your future dryer. Without a constant supply of fresh air and removal of moisture, things will take a very long time to dry, and mold may appear inside. In a standard refrigerator, the door closes hermetically, so it is necessary to organize forced or natural air exchange.
There are two main approaches. The first is to create holes in the bottom and top of the body for natural traction. The second is the installation of computer coolers (fans) for forced circulation. The second option is much more effective, especially if you plan to dry large volumes of laundry or use heating.
To implement forced ventilation you will need one or two duct fans with a diameter of 100-120 mm (similar to those installed in hoods). One fan is installed at the bottom of the case to take in cold air, the second at the top to exhaust hot, humid air. It is important to coordinate their power so that excess pressure is not created inside.
- 💨 Drill holes with a diameter of 100-120 mm in the lower part of the side or rear wall.
- 🔼 Make a similar hole in the upper part for air outlet.
- 🔌 Connect the fans to the network 220V through a switch to regulate operation.
If you choose natural ventilation, the diameter of the holes should be larger, at least 150 mm, and they should be protected with a metal mesh from rodents. Draction in this case it will depend on the temperature difference between inside and outside the chamber.
Installation of heating elements (heating elements)
The use of heating elements turns your dryer from a simple ventilated chamber into an active one drying cabinet. This allows you to dry clothes in winter in an unheated garage or speed up the process several times. However, here lies the main risk - fire hazard. The plastic inner liner of the refrigerator easily melts upon contact with an open heating element.
For safe heating, it is best to use low-power tubular electric heaters (heating elements) designed for ovens or special ceramic heaters. The power should be calculated based on the volume of the chamber: for a standard refrigerator with a volume of 250-300 liters, a heating element with a power of 0.5–1 kW is sufficient. A more powerful heater may melt insulation or damage clothing.
| Heater type | Power | Safety | Recommended location |
|---|---|---|---|
| Open coil | Any | Low (fire) | Not recommended |
| Heating element for oven | 0.5 - 1.5 kW | High | Bottom of the case |
| Film heater | up to 0.5 kW | Medium | On the walls |
| Fan heater | 1 - 2 kW | Average | Outside (injection) |
It is strictly forbidden to install heating elements in close proximity to plastic walls. The minimum distance should be 10-15 cm. The ideal solution is to create a metal reflector screen between the heater and the wall of the refrigerator, which will direct heat to the center of the chamber.
Is it possible to use a "breeze" type heater?
Technically it is possible, but this is a bad idea. Such heaters have an open spiral and often cause fires in confined spaces. It is better to use closed heating elements with a thermostat.
Installation of shelves and hangers for clothes
The internal space requires adaptation for drying things. Standard shelf holes in refrigerator walls can be reused. However, if you plan to dry your clothes on hangers, you'll need a sturdy rod. A metal pipe or even a wooden handle from a shovel, treated with varnish, works well as a rod.
To install the rod, drill two holes in the upper part of the side walls at the same level. Make sure the holes do not interfere with hidden wiring or insulation if any remains. The bar must support the weight of wet clothes, so use reliable fasteners, such as pipe flanges.
- 👔 Install an upper bar to place hangers with shirts and jackets.
- 🧦 Install 2-3 removable wire shelves for drying socks, towels and small items.
- 🪝 Add hooks to the door or side walls for belts and accessories.
If the original shelves are not suitable in size or material, they can be easily replaced with lattice shelves from a hardware store or made yourself from metal mesh. The mesh provides better air circulation from below and above, which is critical for uniform drying.
☑️ Checking the internal configuration
Electrical circuit and temperature control
Safe operation of a homemade device is impossible without a control system. The main task is to prevent overheating, which can lead to damage to things or fire. To do this, a thermostat must be included in the power supply circuit of the heating element. thermostat (thermostat).
You can use the old thermostat from the refrigerator itself, if it is working, but it is better to install a new, more accurate device with an adjustment range of 30-90°C. The thermostat sensor is located at the top of the chamber, where the temperature is maximum. When a given limit is reached (for example, 50-60°C for delicate fabrics), the circuit opens and heating stops.
Connection diagram:220V network -> Switch -> Temperature regulator -> Heating element
|
-> Fans (in parallel)
It is also recommended to install a timer that will automatically turn off the dryer after a specified time. This will protect you from a situation where you forget to turn off the device. All electrical connections must be made in a distribution box using terminal blocks, and the wires must have heat-resistant insulation.
⚠️ Attention: All work on connecting to a 220V network must be carried out only with a completely de-energized network. If you do not have the skills of an electrician, entrust the connection to a professional. The refrigerator body must be grounded.
Final assembly and first launch
When all internal work is completed, it is time for final assembly. Make sure all ventilation openings are meshed and heating elements are securely fastened and shielded. The refrigerator door should close tightly, but not hermetically - a small gap in the seal is even useful for micro-ventilation if there is no forced exhaust.
Carry out the first start in test mode without laundry. Turn on the heating and ventilation, set the thermostat to minimum. Monitor the internal temperature using an external thermometer. Check if the shutdown occurs when the set temperature is reached. Also listen to the operation of the fans - there should be no vibrations of the case.
If all systems are working properly, you can load the first batch of wet things. Distribute them evenly, do not crowd the chamber so that air can circulate freely between things. Drying time will depend on the humidity of the clothes and the power of the heater, but usually it is from 1 to 3 hours.
Regularly check the condition of the door seal and clean the ventilation holes from lint and dust. With proper care, such a homemade dryer will serve you for many years, saving your budget and preserving the environment from excess waste.
What is the optimal temperature for drying synthetic fabrics?
For synthetics, it is not recommended to raise the temperature above 40-50°C. At higher temperatures, synthetic fibers can become deformed or “baked”, losing their properties. Use the gentle mode.
Do you need to leave the door ajar?
If you have powerful forced ventilation (blowing and blowing), the door can be kept closed to retain heat. If the ventilation is natural, it is better to open the door slightly or provide large openings in the cabinet.
Is it possible to dry shoes in such a cabinet?
Yes, this is one of the best uses. Shoes are dried at a temperature of 30-40°C. The main thing is to position it so that hot air gets inside the shoes, or use special nozzles on the heating element to supply warm air inside.
How much electricity does such a dryer consume?
Consumption depends on the power of the heating element. With a power of 1 kW and the operation of the thermostat (which turns off the heating part of the time), the actual consumption will be about 0.4-0.6 kW per hour. This is more economical than drying things on an electric heated towel rail around the clock.