Hmm, I didn't actually move that post to this forum; maybe it was moved
here by a moderator of another forum (sci.engr.hvac or alt.hvac).
I wasn't actually considering using all that piping; Nick was merely
trying to show me that I would need an enormous radiator to make an
effective water-based cooling system.
Since I'm here, I might as well post the original message. It follows:
I live in an apartment building which does not have a provision for a
regular window air conditioner. I do have a portable 10,000 BTU unit,
but it performs very poorly and it is expensive to run. I have a porch,
and I want to put a split-system air conditioner on it.
I am an electrical engineer, and I would like to convert an existing
non-split unit rather than purchasing a split air conditioner. Even if
it doesn't save me money, I am set on trying to do it. I'm sure a lot
of people will say that it's not worth it, but if nothing else, I will
come out learning a lot about how air conditioning systems work.
My question is about the fluid which circulates between the compressor
and the indoor (air-liquid) heat exchanger. What are the advantages and
disadvantages of the following:
- Running the refrigerant from the outdoor compressor all the way to
the indoor heat exchanger
- Having two closed loops: one localized loop for the refridgerant,
which stays outside. then a second loop which is cooled by the 1st
loop, and then goes inside to the heat exchanger.
And if I do the 2nd option, what would be a good liquid to use in the
tubing? Theoretically almost anything with a large specific heat
*could* work, but there may be practical advantages/disadvantages to
certain liquids (freezing and boiling points, etc).
If I go with the 2nd method, would I be better off taking apart a large
window AC unit, or taking apart a water chiller (from an old water
fountain)? The water chiller would already have 2 loops, which makes
things simpler, but it is probably not meant for such heavy use. With a
window AC unit, I would have to build a liquid-to-liquid heat
exchanger, such as two radiators immersed in an insulated box filled