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Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
Hi all!
the summer is imminent, now tubes with red-hot plates are inopportune, this is the right time for a cool project (literally!)
few months ago, i got some old air conditioners for free (cool & heat type with R22 gas), now some of these are mounted in my house (i have 6 AC!!!) and some others are still useless. i selected one of them (12.000 BTU/h) for using it as cooler for bottles and cans, with the help of a friend (and a tube bending spring!), i made a coil using a 1/2" copper pipe, than i soldered the coil to the conditioner's pipes, i evacuated the circuit and i opened the gas valves and finally i made the necessary electrical wiring for starting the compressor and the fan without powering the heating valve.
IT WORKS GREAT!, the coil became nice frosty in 5 seconds and in a minute was completely covered by ice, of course, due to his small surface it have a poor heat exchange with air and in these conditions the heat pump is absolutely inefficient, i must immerse the coil in some liquid in order to improve the heat exchange. I tried with a bucket (5.5 liters) filled with hot water and the system was able to lowering the water temperature of 15C° in 3 minutes, nice result especially if consider that the finished machine will have a smaller water container (approx 2 liters included the liquid inside the bottle/can)
COOL project, but still unfinished yet!
I want improove the machine with 2 other feature, a bottle heater and a can shrinker, for the first feature i only need a switch for energizing the inverting valve, for the second feature i need some other gears.
The questions are:
- is the R22 an insulating gas?
- how i can insulate the pipes without gas's leaks?
- how many shoots will be made before a coil failure (or before a leak in a solder joint)?
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
You should be carefull using such a short evaporator: With no load (and even with a lot of load), the gas will pass through it in liquid state. It's all too easy to wreck the compressor's valves with even a little liquid refrigerant in the suction line (the valves are made for gas, not liquid).
If the compressor starts making loud sharp noises, it means its getting liquid, and you should power it down immediately.
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
Hi Zb! Hi All!
You should be carefull using such a short evaporator: With no load (and even with a lot of load), the gas will pass through it in liquid state. It's all too easy to wreck the compressor's valves with even a little liquid refrigerant in the suction line (the valves are made for gas, not liquid).
can i use a circuit breaker to control compressor overloads and immediately disconnect the power in case of some liquid passes through the valves?
If the compressor starts making loud sharp noises, it means its getting liquid, and you should power it down immediately.
No, the air conditioner seems to work well without strange noises and without any problem (except a small gas leak in one of my weld; in order to avoid the total gas loss i now recovered all gas inside the unit and i closed the valves.
EDIT: ----------------------------------
--------------------------------------------------
------------ There isn't an old piston compressor inside the AC but a rotary compressor instead, i don't know if a rotative compressor can have the valves.
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COOL project!
