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Dual evaporators
Posted: Wed Jul 25, 2018 6:20 pm
by Cropduster
First time on forum. I’m having trouble cooling the cockpit of a crop duster. We have a Sandin 508 compressor, a dual core 32,000 btu condenser with a pusher and puller fans, and an under dash evaporator. It works fine until temp gets up over 90 and then it’s just tolerable. My question is can I run a second evaporator under the seat by teeing off of the #6 line coming from the drier?
Re: Dual evaporators
Posted: Thu Jul 26, 2018 8:01 am
by bohica2xo
Yep, no different than running dual evaporators in a Suburban with rear A/C.
Does your current evaporator use a TXV or an orifice tube?
What is the compressor RPM at flying speeds?
Re: Dual evaporators
Posted: Fri Jul 27, 2018 3:32 am
by Cropduster
It uses expansion valve. Not sure of compressor RPM. It’s powered by a 3 hp 24 volt motor.
Re: Dual evaporators
Posted: Fri Jul 27, 2018 7:33 am
by bohica2xo
Well then you just have to hope you have enough refrigerant mass flow. Electric motor / refrigeration compressor systems in aircraft are their own special snake pit...
We did this just about a year ago:
https://autoacforum.com/viewtopic.php?f ... t=aircraft