T&T: "the best" AC system?

[Arild Jensen]

> -----Original Message-----
> From: Ron Rogers

> Those systems made by the same manufacturers are for big vessels.
> Ron Rogers
>
> ----- Original Message -----
> From: "Robert Hagens" <rob at thehagens.info>

> |I have noted reference to "chilled water" A/C. How is that different?
> | Better? More expensive?.



REPLY
They are definitely more expensive. as to better?  that depends on whose
perspective.

Chilled water is the opposite to hydronic heating but works along similar
principles.
Liquid, either plain water or anti-freeze is used as the medium for
transferring heat from one place to another. Chilled water is used to remove
heat from the accomodations space using  centrally located chiller
compressors. The advantage being you do not use up valuabel space for large
air ducts nor do you have noisy, vibrating compressors located in th
eacomodations. Its easier to run a pair of 3/4" hoses  to each compartment
than a one foot square duct.
In smaller vessels under about 60 feet the cost is disproportionate compared
to individual direct expansion  air cons. In larger boats, scaling up means
increasing savings the bigger you get.
remember that mosat commercial buildings are cooled by this system or
something similar.
Another advantage is that you can used staged chillers to handle variabel
loads depending on what geographic locale you are cruising in. This system
lends itself well to reversing and heating  th evessel when in very cool
climates. Boats cruising from Alaaska to Mexico  are a perfect application
for this kind of system. Alaskan waters are too cold for a reverse cycle
system to be really effective.
regards
Arild