Date: Tue, 24 Aug 2004 19:08:58 -0700
Reply-To: Vince S <gipsyflies@COMCAST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Vince S <gipsyflies@COMCAST.NET>
Subject: Re: DC Refrigerator Alternatives
In-Reply-To: <412BE6A7.6010805@adelphia.net>
Content-Type: text/plain; charset="us-ascii"
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
>>
>>
>
>
>
>