[TowerTalk] Oil For Dummy Load

[Bryan Swadener]

I've used water-cooled loads (up to 15KW). 
Every one of them used FLOWING water. Without flow, 
their capacity dropped to nearly zero. 

Eventually, at the other end of the cooling water loop, is 
a water-air heat exchanger. My homebrew air-cooled load 
accomplishes that without liquid as an intermediary, 
or other extra hardware. 

vy 73, 
Bryan WA7PRC 
http://www.tinyurl.com/wa7prc-dummy 




> Date: Sat, 5 Dec 2015 11:55:16 -0600
> From: Patrick Greenlee
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Oil For Dummy Load
> 
[snip]
> 
> 
> Roger, please give a couple examples of things with higher specific heat 
> (heat capacity) than water that are practical for using in conjunction 
> with a DL by typical hams.
> 
> While I would never use water to fill a cantenna, a DL with provision 
> for liquid coolant could do well with water as the heat transfer 
> liquid.  Of the commonly available substances in my limited experience 
> only liquid ammonia (as used in old time refrigeration systems) would do 
> better but I HATE AMMONIA so would not go there personally.
> 
> Patrick        NJ5G
> 
> On 12/5/2015 12:00 AM, Roger (K8RI) on TT wrote:
>>  one point:
>> 
>>  Water does not have high heat capacity, but it's great for 
>>  transferring heat.  1 calorie will heat 1 cc of water 1 deg.
>>  Heat capacity and the ability are quite different.
>> 
>>  73
>> 
>>  Roger  (K8RI)