DRAFT COOLER
What is a refrigerator:
refrigerators for domestic and industrial small consisting of a casing, usually steel thin enamel, divided into two distinct parts, one designed to contain the products to be preserved, the other enclosing the equipment for the generation of the cold (more properly, to lower the temperature in the enclosure).
Equipment refrigerant. The lowering of the temperature inside the refrigerator and keeping it within Imitate set can be achieved by circulating in closed circuit (using electricity) certain substances in accordance with special cycles, such compression cycle and absorption cycle, which give the name the two types of commonly used refrigerator.
In the compression cycle, by far the most popular for ease of operation and the lower cost of operation, a fluid in a gaseous state (usually ammonia, carbon dioxide, sulfur dioxide or methyl chloride) is drawn from a compressor with an electric motor which, due to the compression, reduces volume and increases in temperature; then, in a condenser circulating air or water, is cooled at constant volume, until liquid and then passing (if liquid) into a reservoir from which, through a valve controlled by the thermostat is put in the necessary amount required for cooling in an evaporator where it expands abruptly and can return to gas extracting heat from the environment, ie generating cold. Evaporator, the fluid returns to the compressor and the cycle begins again. In the absorption cycle, which is used almost exclusively for domestic refrigerators of small size, a mixture of fluids (usually water and ammonia) is heated in a boiler by heat supplied by electrical resistance (candle), producing steam that passes under pressure into a condenser where it cools and liquefies then transferred to an evaporator where it expands back to gas with heat dissipation from the environment, an absorber and then collects steam to mix with the liquid, the mixture back into the kettle and the cycle starts
The motors and condensers of household refrigerators are very large, so it becomes impossible to use unless you have plenty of space, after several searches the my eye fell on the ice cream type Gaggia ", inside there is a mini compressor and a condenser skeleton, in addition to the engine and the cup for ice cream, removing these two items would also include the place where the evaporator and the water pump.
In principle, schematically, the change should be made in this way but will not necessarily work in progress to find other alternatives to simplify the work:
After a long period of waiting, my waiting was rewarded, I found two in a market operating at neutral ice cream price of 14 €. Part 1
disassembly
At this point we begin to open it and examine it:
Tolte the 4 screws on the sides and the 4 under the transparent cover, it will appear throughout the mechanical
begin by removing the engine and associated gear connected to the refrigerant drum
removed all the gears and the drive belt, with a lot of patience away the Teflon to the center of the basket, I suggest you start to split it with pliers, reach the end of practice on the cutting edge of the bush and remained then a stonemason Comminute.
with tape-sealed aluminum center hole of the drum, the tape is used Scotch brand tape, "is often used in air conditioning systems.
reposition the basket and cooler fissiamolo.
practice a rectangular hole on the box to house the controller and montiamolo.
removing the original we get timmer a perfect housing for gripping the probe (to make it a little more aesthetic I had a sticker) because the central hole we put a RCA jack.
Part 2
examine the wiring harness of wires, two wires from the compressor out a brown and black one, they need to sustain it, we will also find two blue wires that are connected to the condenser cooling fan, all the remaining wire to part of the yellow / green (earth) we can eliminate them, of course, also left the network cable.
diagram: Q
his is the terminal of the controller:
two wires soldered to the RCA socket, then connect the the same controller and secure the cable to the box with hot glue.
Continue assembling the two relays and two cables to power the controller.
Connect the wires as per wiring diagram, making sure they are secure and away from heat or motion, see the fan and evaporator. With the scheme in hand again calculate the wiring and then replace the cover and pass the probe.
The probe could be put directly in the tank but in the case of salt water is likely to be eroded in order to protect the insert into a collection tube.
sensor is connected to the socket and turn on the fridge, we set the thermostat at a temperature of "x", we put the probe into the basket and if all was well connected to the fridge turns off the instant that the drum has reached the test temperature that we set.
Note:
one of the two switches on the box is not used.
3rd part heat exchanger
In my case I was lucky but I do not say fortunatissimissimo, the glass of my filter
Marathon fits perfectly in the basket.
For those who do not use this filter, you need to find a container that fits into the basket and at the same time it is inspected so that you can periodically clean without much effort. I'll look around to see what you find. To make
between the basket and the glass and / or container there is an excellent exchange Heat must put something, asking for installation of equipment for air conditioning, 99% advised me antifreeze 1% advised me putty from windows, anti-freeze can not use it because I fear that the aluminum tape, plugging the hole in the center of the drum, with the cold causing the loss of antifreeze necklines also the same tendency to evaporate, the grout is too hard and therefore does not fit perfectly between the basket and glass, another flaw in the stucco dries.
that puts us, I think you think back to dust off my old fundamentals of electronics, conductive paste is the best way that you put between the cpu heatsink and PCs, a quick search online and find one who works and them to the distributor, called the local dealer tells me that is available in jars of 1 Kg to 30 €, I would recommend these cans as they are much less expensive packaging than that for the sake of cutting the stock to be sold to 12 or 24 pieces at a time.
