Originally Posted by Offgr1d
Awesome!! Looks like I fun project. I have enjoyed working on AC stuff and I see from your posts you really like that kind of work as well. I would love to add the electronic TXV for mine so I could more accurately monitor and adjust the head pressure. The plates work so well that if the water is warm to hot my head pressure runs a little high, but as the water cools it drops rather dramatically and boy do the plates run cold. I will definitely end up adding glycol to my system to avoid a plate freeze..
Will you plan for any air while parked?? That was my main goal. I'm parked far more often than I am driving now.. With the generator I'll be able to run the chiller while driving as well if needed.
What's the company that makes the condensor you got?
my condenser is from ProAir LLC out of elkhart indiana.. they bought Frigiking a few years back... Frigiking was big into coach builders and factory OEM A/C systems (auxilliary) for busses / taxis, vans, etc.. its rated at 60k btu supposedly.. measureing its coil area and noting its parallel multi-pass design I believe it will be at or above its rating..
being under the bus there wont be much ram air going through it.. so I can control the head pressure with the fans.. the evaporator has a Block type TxV and I'll give it a shot.. they claim its really good.. (im used to adjustable valves... so we shall see)..
your compressors are multi stage correct? you could mount a switch that when the head pressure runs above where you feel its comfortable you can trip an unloader t oreduce the output of the compressor.. your water wont cool as quick but it will run more efficient..
the other thing is once you get both compressors running your head pressure may run lower by itself.. you will be dropping the water temp quickly.. esp if you dont run all the fans at once.. your loop temp will drop quickly and head pressure will go down...
but I think you can control your capacity and head pressure using unloaders and condensor fans..
right now I dont think I'll be parking more than short times in the bus.. and those times I'll be running the engine.. but in the works is the idea of a tri-pak that could be a small engine running the compressor... I just want to have A/C before I hasve that little box built.. once I get it built id move the compressor off the engine and into the tri-pak style box.. thus I could run A/C without the main engine..
I would love to have an all out generator but I dont like the horrendous loss of ground clearance on a school bus that I see.. driving the bus in the city will cause issues going into driveways and such if I had a generator hanging down..
so my choice is to build a smaller generator that can fit where I want it to and not kill the ground clearance..