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Old 11-12-2016, 03:14 PM   #21
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A/C capacity is another tging to think about too.. you need much more capacity going down the road than when parked.. a properly sized system running on the road can easily become a grossly over-sized system when parked...

I personally like the idea of completely separate systems... I realize many of you may not go to campgrounds often but if you do and have only small-diesel A/C then you cant shut down that engoine and use the already-paid-for electricity in the campground...

Road A/C for the road and electric A/C for when parked.. esp since a Genny is likely in the bus already anyway so it can be sized to run an A/C or two.. and you have the option if shore-docked to use that power...

-Christopher
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Old 11-13-2016, 10:23 AM   #22
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Too many options.....

How about a 4 cylinder diesel (20-30hp?) with a compressor already attached?

https://boise.craigslist.org/hvo/5839421522.html
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Old 11-13-2016, 11:03 AM   #23
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I dont see why not depending on the compressor and capacity... at the very least the motor could be repurposed i would think..

the compressor needs to be designed to work with R-134A, I dont know what refrigerantas those use but my guess is 134A... the only issue i can see is that I know some reefers are direct drive compressors with no decouple.. so the compressor spins anytime the engine is on.. in a reefer trailer the cycle time is a lot longer than in that of a vehicle interior, which would result in a lot of starts and stops for that engine..

if its one that has a decouple on the compressor then the engine will idle down when not calling for service.. since TK is still in business you may be able to still get specs / service info on it...

the engine itself seems like something worth having.. at the worst, fab up some brackets for a compressor and alternator and you have a mini-genny (for inverter stuff) and your A/C.. a lot of the TK stuff is actually not too noisy either..

-Christopher
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Old 11-13-2016, 11:13 AM   #24
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Seltec MT16 spec sheet: Valeo Compressors » Technical specifications: TM13 / TM15 / TM16

looking at the performance graph it appears that it would take a minimum of about 10hp to get 30k Btu using this compressor.

Not my area of knowledge. Am I interpreting this properly?
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Old 11-13-2016, 11:17 AM   #25
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Quote:
Originally Posted by cadillackid View Post
I dont see why not depending on the compressor and capacity... at the very least the motor could be repurposed i would think..

the compressor needs to be designed to work with R-134A, I dont know what refrigerantas those use but my guess is 134A... the only issue i can see is that I know some reefers are direct drive compressors with no decouple.. so the compressor spins anytime the engine is on.. in a reefer trailer the cycle time is a lot longer than in that of a vehicle interior, which would result in a lot of starts and stops for that engine..

if its one that has a decouple on the compressor then the engine will idle down when not calling for service.. since TK is still in business you may be able to still get specs / service info on it...

the engine itself seems like something worth having.. at the worst, fab up some brackets for a compressor and alternator and you have a mini-genny (for inverter stuff) and your A/C.. a lot of the TK stuff is actually not too noisy either..

-Christopher
I have never worked on a refer unit but I have plenty of time with one parked outside of my bedroom window......

The engine runs 24 hours. It does not shut down when the target temp is reached like an electrically driven compressor. I would have expected it to have an electric clutch like an automotive a/c or engine driven marine refrigeration.

How do they make it play without a clutch?
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Old 11-13-2016, 12:06 PM   #26
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some reefers shut down some dont... ive heard them both ways... I just dont know which type that one in the ad is..if they dont shut down then it will likely have a clutch as you mentioned unless it simply uses unloaders in the compressor or a variable ratio compressor.. similar to the newer cars which dont cycle... (a concept that was once used in cars for many many years a variable valve on the older cars.. nowadays computer controlled compressor)..

I run my TM-16 compressor (bought from ProAir LLC) with about 50-60k of evaporators and it still maintains pressures and cools good.. im not dure of the horsepower pull.. but I definitely notice it on my DT-360 esp when its really hot out.. I had to go to a wider Belt because the included one didnt have enough exposure on the pulley and always wanted to slip.. since the new Gates belt it hasnt slipped..

the unit in my new bus is rated at 42k BTU and is using a TM-16 compressor.. it seems to cool good though I only have the experience of driving it form texas to florida in september and the unit was a little low on freon but still kept me cool... it is at the rear of the bus so I need to fashion a dash evaporator up front or i'll freeze out anyone riding back there in the hot summer..

the TM-21 is a bigger beefier compressor but will be tough to spin with a single V-belt unless you have an idler to get good surface area on both the drive and driven pulleys.. its pad mount similar to the old tecumseh compressors...

I rarely see a bus using it.. most times people install 2 separate smaller systems using TM-16's..
-Christopher
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Old 11-13-2016, 02:01 PM   #27
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Quote:
Originally Posted by PNW_Steve View Post
Too many options.....

How about a 4 cylinder diesel (20-30hp?) with a compressor already attached?

https://boise.craigslist.org/hvo/5839421522.html
That's an older TK unit than the ones I'm familar with.... but if it works the same way the engine would start and stop to maintain temperature in the trailer box. As far as cooling power I'd sat at least 100000 BTUs since they are designed to get a semitrailer cooled down in a hurry. The temperature on the ones I know could be set anywhere from +80 to -20 so it definitely has the power to cool a bus.
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Old 11-13-2016, 02:33 PM   #28
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sounds like repurposing a reefer might be a good option if you dont mind the engine stop and start.. it is important to properly size the evaporators and condenser to each other..

the form factor of a reefer isnt ideal for a bus, however like any refrigeration piece it can be disassembled and modified... ive certainly done enough of HVAC modding.. again following the science behind it (including oil return to the compressor).. success can be had!
-Christopher
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Old 11-13-2016, 02:40 PM   #29
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Indeed. The thought of doing something similar crossed my mind as well, with the reefer unit everything you need is in one package, just would require a diagram showing how everything is interconnected, and some metal fabrication skills to be able to rearrange it all to work in a bus. The added advantage would be that if you're in a cold location you set the reefer unit to low to mid 70s and it functions as a heater as well.
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Old 11-13-2016, 02:58 PM   #30
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do some Reefers have a heatpump or does it use some of the engine heat to a re-heat coil to help maintain temperature?.. the One I saw had a very small electric coil on it.. few hundred watts.. reefer trailers are insulated VERY WELL so it doesnt take much to keep it above freezing.. im really interested to know the actual capacity of them though... the coils dont look near big enough to be 100k BTU... of course im sure they are like any other device, different sizes made..
-Christopher
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