Date: Tue, 24 Aug 2004 21:13:23 -0700
Reply-To: Michael Elliott <j.michael.elliott@ADELPHIA.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Michael Elliott <j.michael.elliott@ADELPHIA.NET>
Subject: Re: DC Refrigerator Alternatives
In-Reply-To: <003f01c48a48$7ba7a800$c200a8c0@vsovaio>
Content-Type: text/plain; charset=us-ascii; format=flowed
So filling the reefer with very humid air at, say, 80F, then shutting
the door will raise the temp of the contents of the reefer more than
very dry air will. I wonder how much effect this would have on a
six-pack of Coke?
Mike "Rocket J Squirrel" Elliott
71 VW Type 2 / 84 Westy: A poor but proud race.
KG6RCR\
Vince S wrote:
>It can be calculated with the specific heat of air which is a function
>of temperature and humidity. Humidity plays a very big part as water
>vapor has very high specific heat.
>
>- Vince
>
>http://gipsyflies.home.comcast.net
>1989 Vanagon GL Camper
>1993 Mazda Miata
>1996 Land Rover Discovery
>2005 Mini Cooper S (almost here)
>
>
>
>
>-----Original Message-----
>From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
>Of Rocket J Squirrel
>Sent: Tuesday, August 24, 2004 6:09 PM
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: DC Refrigerator Alternatives
>
>
>Stan Wilder wrote:
>
>
>
>>That all sounds real good.
>>What I see as the weak link is that the door opens and the cold dropps
>>out. If the Westy fridge was just flipped over on its little backside
>>it would become a good bucket to hold the cold. The refrigeration unit
>>would work just as hard but the fridge would stay colder.
>>
>>
>>
>I wonder how much "cold" is "stored" in the air inside the reefer, and
>how much is "stored" in the food, etc. It might not raise the temp of
>the food to cool the new air that has come into the reefer during a door
>open/close cycle.
>
>Mike "Rocket J Squirrel" Elliott
>71 VW Type 2 / 84 Westy: A poor but proud race.
>KG6RCR
>
>
>
>
>>----- Original Message -----
>>From: "Michael Elliott" <j.michael.elliott@ADELPHIA.NET>
>>To: <vanagon@GERRY.VANAGON.COM>
>>Sent: Tuesday, August 24, 2004 7:33 PM
>>Subject: Re: DC Refrigerator Alternatives
>>
>>
>>
>>
>>
>>
>>>Vince S wrote:
>>>
>>>
>>>
>>>
>>>
>>>>A new subject to better reflect the content.
>>>>
>>>>Here is a self-contain complete system built with Danfoss BD35F if
>>>>you provide your own fridge box such as modifying the existing
>>>>Dometic cavity and put this unit in the small cupboard adjacent to
>>>>it.
>>>>
>>>>http://www.sailnet.com/store/item.cfm?pid=30527
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>Hmmm. I'm trying to wrap my head around this one. My Westy is on some
>>>truck miles from here right now, so I can't take a measuring tape to
>>>it
>>>-- how thick is the insulation on the stock reefer?
>>>
>>>Power consumption for this unit is expressed as average run time X
>>>power input. Power input is said to be 45 to 60 watts (why the
>>>range?). Average run time for 2'' polyurethane insulation is 40% .
>>>This affords an internal temp of 41F with outside temp of 80F. Worst
>>>case with these numbers would be 60W X 40% =24W =2 ampere/hr @ 12
>>>volts.
>>>
>>>Did I do that right?
>>>
>>>Given the largest battery that can fit under the driver's seat -- how
>>>quickly would it become discharged at 2Ahr?
>>>
>>>And this Danfoss BD35F-based Waeco Coolmatic Cooling Kit . . . the
>>>"larger picture" is the same low-rez picture on the linked page
>>>(above), just scaled larger so there isn't really more information. It
>>>
>>>
>
>
>
>>>is larger, though, so they ain't lying. What I can't quite figure out
>>>is where the hot air is meant to be dumped. If you mount the
>>>compressor in the small cupboard adjacent to the fridge box, I reckon
>>>the heat would have to be vented outside somehow?
>>>--
>>>
>>>Mike "Rocket J Squirrel" Elliott
>>>71 VW Type 2 / 84 Westy: A poor but proud race.
>>>KG6RCR
>>>
>>>
>>>
>>>
>>
>>
>>
>
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