Introduction: How to Make a Fast Cooling Freezing AC : Conditioner for Portable Mini Refrigerator to -10°C!

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The essence of the cooling and freezing process lies in the change of gas temperature as it passes through compression and expansion in the air conditioning system. When the gas expands in the copper pipes, there is a decrease in temperature, resulting in the absorption of heat from the surrounding environment, including the walls of the pipes. This can cause condensation of moisture on the surface of the pipes and, in case of high humidity in the air, even the formation of ice.

Supplies

We will need:

  1. Wooden platform with pre-made holes
  2. Copper tube for: 4.7 mm
  3. Copper tube for: 2.7 mm
  4. Copper tube for: 1.2 mm
  5. Gas for lighter refilling
  6. Medical needle
  7. Water pump with a sealed housing at 12 volts or a high-pressure gas pump
  8. Fan 12-volts

Step 1:

Use a 4.7mm diameter copper tube, similar to the ones used by professionals in the installation of commercial or home air conditioners for laying air conditioning system lines.

Wind the copper tube around a full aluminum Coca-Cola can. Using an empty can won't withstand the load and will bend. A full can serves as an excellent base without the need for a pipe bender of the appropriate diameter.

Depending on the compressor's power, determine the number of turns. I ended up with a spiral with 15 turns. Too many or too few turns can affect the air conditioner's performance, as well as negative compressor power moments and excessively small or large evaporators. The evaporator cools the air inside the room. Hot air entering the air conditioner passes through the evaporator, where the liquid (usually freon) evaporates, absorbing heat from the surrounding air. As a result of the evaporation process, the air cools down.

Step 2:

A 25mm diameter stainless steel sleeve serves as a second base for making the condenser. The condenser is a component where the hot gaseous refrigerant, having passed through the evaporator, condenses back into a liquid. In this process, heat is released, which was absorbed in the evaporator. The condenser is usually located outside the building or car, and its cooling is done by a fan. After passing through the condenser, the refrigerant is ready for the air cooling cycle again. Use a 2.7mm diameter tube.

Step 3:

A thin copper tube with a diameter of 1.2 millimeters will serve as the capillary tube. A capillary tube is a narrow pipeline through which the distribution and regulation of the refrigerant flow (e.g., freon) in the air conditioning system occur. The capillary tube creates the pressure necessary to convert the refrigerant from a liquid to a gas, thereby contributing to air cooling. A screwdriver is best for making a spiral capillary tube, as its diameter is approximately 6 millimeters.

Step 4:

For the condenser to work correctly, a fan is required. I will use a 12-volt fan from an old computer.

I also use a sealed water pump at 12 volts. It is better to use a gas pump for reliability and durability.

Secure all components and install them in their places.


Step 5:

Connect pipes of the appropriate diameter, with one of them made of soft silicone so that a punctured hole can self-seal.

Attach the evaporator and condenser to a suitable platform using two-component glue.

Solder the capillary tube to the condenser and evaporator using special solder and flux.

Solder a connector for a 9-volt battery to the pump and fan.


Step 6:

Everything must be airtight, so I use many clamps to withstand pressure and prevent leaks!

To charge our air conditioner, I use a gas canister for lighter refills and a medical needle instead of freon.


Step 7:

In this air conditioning system, based on the use of gas (such as butane or propane) as an energy source, several key elements play an important role. The first stage of testing is conducted in an open area to ensure the efficient passage of liquid gas through the pipes and capillary system of the conditioner. Excess pressure that occurs during the initial pump startup is regulated by the membrane corresponding to the pump's design.

The process begins with filling the air conditioner with gas, where copper pipes play a key role in the circulation of gas and heat exchange between the air and the working substance inside the pipes. The pump, controlling the pressure, ensures the circulation of gas throughout the conditioner's circuit.

Thus, an air conditioning system using gas as an energy source provides effective cooling by changing the gas temperature and its impact on the surrounding environment.