[PUP] CENTRAL AIR CHILLED WATER SYSTEM VERSUS STAND-ALONE UNITS

[Hal Wyman]

After having individual direct expansion units in my previous boats, I opted
for a central chilled water system in Que Linda.  I made a mistake.

The main difficulty is that the compressor with the capability to cool the
whole boat draws a huge amount of power, frequently more power than the
shore power can afford.  To be specific, the chiller requires about 35 amps
240 volts when running.  When cooling one stateroom it is on a very low duty
cycle, (iow, it runs full power but only about 10% of the time) but the
shore power needs to be able to handle the peak load.

Individual units for each stateroom or each area on the boat would allow a
smaller shore power connection to cool just the master stateroom, for
example.

 Hal

> -----Original Message-----
> From: passagemaking-under-power-bounces@lists.samurai.com 
> [mailto:passagemaking-under-power-bounces@lists.samurai.com] 
> On Behalf Of Mike and Ann Michelin
> Sent: Tuesday, June 05, 2007 9:24 PM
> To: passagemaking-under-power@lists.samurai.com
> Subject: Re: [PUP] CENTRAL AIR CHILLED WATER SYSTEM VERSUS 
> STAND-ALONE UNITS
> 
> 	Hi All,
> 	I am currently deciding on an air conditioning system 
> for my boat.
> 	The debate is between having the usual stand-alone air 
> conditioning units in each room, versus using the central 
> system that uses chilled water, and basically a small 
> radiator and fan in the room.
> 	I understand that the chiller system is the same as 
> that used in big buildings, and that they now make it in 
> systems that are marine-adapted for boats.
> 	Note, I am in the tropics, so "winter freeze" sitting 
> at dockside is not an issue.
> 	Thanks for the pros and cons to help me decide.
> 	
> 	Mike
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