Quote:
Originally Posted by cheryl_ann44
I would be interested in hearing about your ac plans
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right now for A/C, my plan is to install a Thermoking 45,000 btu ceiling mount evaporator and a skirt mounted condenser..
I'll run a single 10cid compressor from my DT360 engine.. the evaporator location will likely be side mount just behind the driver area.. this "should" keep the bus and me cool while driving.. my only concern with this is my work area is going to be right across the aisle.. and im not sure I want A/C blowing directly on my while I work...
so my second idea is to mount the evaporator scross the back of the bus above the rear door.. this will cool the bus but not blow directly on me while im parked and in my work area or sleeping.
I will then need to handle cooling me while im driving..
in my previous bus I constructed and added cooling evaporators to the Defrosters..(based on honda civic stock coils and drain pans..
the late 80s bluebirds had 3 round outlets that could be spun around easily on the driver side and there were 2 on the right side.. when I wanted to A/C I spun the vents around and they were perfect dash vents.. since no cold air went on the windshield I didnt fog it on sultry nights.
I have a bit of a challenge on my new bus as the defrost vents are simply slots going all across the windshield. . so there are no vents to spin around.. the older carpenter busses used to have the sound vents but switched to the slots as the older busses had terrible winter de-icing performance..
I could create a device to block off the slots when I wanted cooling.. then put closeable dash vents into the defrost ducting and then add coils like i did before.. (notice the thomas defrost dash vents).. but since the whole defrost duct on the bus is metal.. im going to have a wet mess on hot humid days...
so my next thought is I'll use a jeep YJ style under-dash evaporator and see if I can get enough cold air directed at me... along those same lines rear limo units are made ductable.. where I could run ducts up to dash vents closer to me...
I'll know much more once I get the bus and can dismantle the heating systems to see what kind of room is available inside them if I want to go that route.. and also measure my underdash area for an evaporator box for that route..
now looking at numerical capacities.. this should be pretty easy..
I'll run a TM-21 compressor which gives me better idle cooling performance.. the maxx RPM of the TM-21 is 4000.. which is perfect in a diesel.. in fact i could overdrive it slightly if I need to with my max engine RPM well below 4000 (DT-360)
the condenser can handle up to 50,000 btuh at high ambient conditions.. I will be able to use the single condensor and compressor for both indoor coil sets..
the average BTU of an underdash unit is about 9000..
I will run TxV on both evaporators in parallel.. .. I'll build out a controller such that the compressor will only cycle if the suction temperatures go below freezing.. otherwise it will use its own internal relief valves to limit flow...
a TxV run with a pressure regulator on the evaporator output almost 100% ensures you wont freeze one up even if you shut the fans off on both... in very low flow conditions the condenser will simply fill with liquid reducing the head pressure (and energy usage).. of course i'll set it up that if neither fan is turned on then the compressor wont run...
my first step will be when I get the bus up here and the Thermoking SA-400 system parts , to measure and see where i want to mount the evaporator.. and then install that system first and drive the bus in some good hot weather.. (i'll likely drive it to florida or texas) and see how well i stay cool in the driver seat...
when I ran it on the test drive (no A/C) it was about 77 outside and not sunny.. a bit humid and it was pretty warm in the driver seat.. BUT I only had the driver window open and all of the Heater valves were still open so i expected to get a little warm...
my pland for A/C all involve running the main engine.. simply because I dont plan to shore-up or stay for days in my bus.. the nly time I will sleep in it is for rest on long marathon drives.. and I'll simply stop at idling-allowed locations.. (which most are right now)... the DT360 isnt bad at slow idle.. which is all I will need with the TM-21 compressor.. I wont need to run it at fast idle...
im building an engine monitoring and warning controller that can wake me up if somethign goes wrong.. ie coolant loss, oil-pressure loss, over temp, low fuel pressure, etc.. its a mechanical engine so I cant shut it down but I can have it warn me (both locally in the bus and via mobile app on my cell.. the bus will be internet connected 24/7/365)...
-Christopher