I don't understand the "heat exchanger on the input line to cool the input air" what are you cooling it with?
Inlet is ambient air so you can't cool it with an air cooler as it is already that temp.
It might be 3 phase.
Larger receiver tank would be good as long as it could be filled with in the current run time limit. And of course the tank(good if it's propane) the PRV and the components would all have to be rated for 200 psi or greater.
Just BE SURE you follow proper procedures for removing ALL of the propane!!!!!
Be safe out there
Brain fart I guess. I know that the Jun-air compressors are cooled by the oil in the system. The motors run in a dielectric oil for cooling. They make about as much noise as a refrigerator and they gang compressors together to get more airflow. The insides look very much like the old York A/C compressors, only much smaller.
Products - JUN-AIR
I had one for awhile and it was a nice portable for working inside, but the tank rotted out and the compressor cap and starter was blown. Parts are not easy to find at reasonable prices.
Thanks for the comment justinsane, please accept my apologies for the delayed reply. I don't feel offended at all; contrary your expert knowledge is welcomed, after all thatís the meaning of the forum.
It is important to say that what you saw in the maintenance video it hasnít the meaning of showing some kind of expert knowledge; I made it mainly as a simple guide for all of us that we are amateurs and DIYers. Speaking for myself, the lack of expert knowledge as well as the limited budget makes me extra careful in everything I make so to use it for as much time as possible without problems.
I agree with you about the maintenance operations, the oil check and the filter is the most important, however as I said above all the other operations need to be taken as a simple guide, unfortunately I didnít explained it on the video and thatís was a mistake!
Now, as for the 10 hours of checking the oil it is because I have seen from my other projects that the compressors losing a small amount of oil (the compressed air moves oil to the tank) and since the compressor at the time of making the had only 10 hours of work I wanted to see how much oil needed to add, since fridge compressors havenít an oil checking window as well to have it as reference point for later maintenance-oil refill.
It will be very helpful for me if you can tell an estimate time for checking the oil?
As for the construction of this compressor, I proceeded by copying similar units that are commercially available; for the compressor unit I hadnít the slightest idea about the differences between the types that uses 134a, 407c or 404a refrigerant, I just asked the supplier an affordable unit close to 300Watts (the lack of knowledge I said before).
I really appreciate your expert opinion-suggestions, are very helpful for me! I'm sure your expert knowledge will also appreciated from many others here that like to make their own silent compressor!
Just to elaborate r134a (like its predecessor r12) is a lower pressure refrigerant, meaning that both the high side and low side operate at lower pressures than say r22 for the older school or modern r407c or 404a.
134a compressor will see 68 psi at 20įC or 68įF whereas 407c is 113 psi and 404a is 143 psi so if we were to assume that they are all expected to runt he same high side temperature that would mean the 407c and 404a units would expect a substantially higher pressure. When I work on 134a refrigerated dryers the high pressure shutdown is typically lower than the fan cycling switch for the 407c/404a units. In other words the 134a unit is shutting down on high pressure at a lower pressure than the 407c/404a unit is even turning on the condenser fan.
Again what you gain in pressure you will loose in CFM but in an intermittent use scenario storing the air might be a better solution than making it as needed "realtime".
By that I mean that the compressor can run, make/store the air and shut down while you don't need it and when you do need it, it is there.
If you use the lower pressure unit you will be quickly limited to the amount of air that the compressor can make which in all of these cases is not very much.
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