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auto a/c heatpump

Hell Bent 4 on Sun May 25, 2008 7:37 PM User is offline

Year: 67
Make: vw
Model: Baja
Engine Size: 2.0L
Refrigerant Type: 134
Ambient Temp: 32f
Country of Origin: United States

Hi, all. aircooled car, no heat or cool . Can an a/c compressor system be used for heating? what would it take?

bearing01 on Mon May 26, 2008 2:34 AM User is offline

hmmm..... put the condenser inside the dash and put the evaporator somewhere inside the engine bay. That would be the concept. However, may be tough to get a small enough condenser to fit inside the dash. If the condenser is reduced in size then you'd want an even smaller evaporator.

Most AC systems have an ambient temp switch to disable the compressor clutch because in really cold temps the oil tends to not circulate well. If your temps get really low then maybe you would need to go with a different type of compressor? Maybe you'd need a unique system designed for use as a heat pump.

oznznut on Mon May 26, 2008 12:18 PM User is offline

No reason I can think of off the top of my head. You would have to install a reversing valve in the refrigerant system. This just changes the function of the evaporator and condenser. Would need another metering device and a check valve around each of them. Sure, it's doable. But why? If you really want heat, install a muff on the exhaust manifold--just like VW did "back in the day". Also, just for information, most small plane cabins are heated by an exhaust muff.

tony1963 on Mon May 26, 2008 2:00 PM User is offline

A complete waste to time, money and web space, in my opinion.

Grove Automotive Group, Inc.

An Alabama Corporation

Hell Bent 4 on Mon May 26, 2008 2:38 PM User is offline

beaing 01 has a good point,on the oil getting to cold. May be a killer for the idea.
Oznznut you are right it is the best way to heat an aircooled car. But a lot of conditions makes it highly desirable too
heat and cool with one system. All stock exhaust heaters have to small of pipe 1 3/8" too small for most eng. stock heaters
for the type 4 eng. are over 50lbs a lot of weight to hang on the header for off roading. A lot of enthusiasts on
aircooled forums will be interested to try it, if we can work it out.

bohica2xo on Mon May 26, 2008 2:56 PM User is offline

Are you only looking for heat, or do you plan to pump the heat both ways to provide cooling in the summer?

Heat pumps have been doing the job in buildings for decades. If the compressor oil works in that system... You may of course need to provide some aux heat to the evaporator in cold climates, it really depends on how much heat you want.

The bigger issue will be using a condensor for a heat exchanger inside the car. Most condensors are thin, single pass units designed for the front of the car. You will need some sort of airflow arrangement, & will need to deal with a fairly large inlet face. Perhaps a small condensor that was a stand-alone unit like the mid 1980's audi 5000 or some dodge trucks - both of which had a fan and shroud already attached.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Hell Bent 4 on Mon May 26, 2008 7:58 PM User is offline

bohica2xo, heat & cooling is what we need. Many use old gas heaters, so old they are dangerous. New gas heaters are $3,000
and you still need a/c.
Aux heat for the out side condenser can be had from head cooling air, although exhaust fumes will be present.
Is it gust me or is it confusing when referring to condensers or evaporator in a heatpump system, which can reverse.
Theoretical system, seltec tm-13,parallel flow condenser 12"x 14",inside car,parallel flow condenser 18"x 17.5"outside.
Air flow arrangement can be worked out. Could a universal evaporator/system at this site be used ?

Edited: Tue May 27, 2008 at 3:13 AM by Hell Bent 4

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