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
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>