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1. [Amps] more - oil bath GS-35b (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Mon, 30 Mar 2015 11:59:53 +1300; Gurus, I am persuaded the RF situation (of a completely enclosed tubeset) is feasible. I see that the ceramic body of the GS-35b must have some sort of cooling as well, so I figured O-ring the grid-r; /archives//html/Amps/2015-03/msg00076.html (8,798 bytes)
2. Re: [Amps] more - oil bath GS-35b (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Sun, 29 Mar 2015 23:01:24 -0500; You do not need to slow the flow down in order to pick up heat. The faster the flow the more heat will be transferred. On another note, you will need as much air movement to cool the radiator as you; /archives//html/Amps/2015-03/msg00077.html (11,126 bytes)
3. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Mon, 30 Mar 2015 17:20:50 +1300; Correct! The faster the oil flow in the tube cooler, the better the cooling. But not so for the radiator. The oil must slow down and be in the radiator for a finite time for the heat to be transferre; /archives//html/Amps/2015-03/msg00078.html (8,828 bytes)
4. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Mon, 30 Mar 2015 08:27:38 +0100; Make sure you don't create a situation akin to a Van de Graaff generator where oil goes through 3kV at the anode, then through insulated pipes to the cooler. A place I worked many years ago trialled; /archives//html/Amps/2015-03/msg00080.html (7,569 bytes)
5. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Mon, 30 Mar 2015 22:44:53 +0100; Ooops, that was meant to be 4CX15000. Fluid cooling is efficient, but not that good! Make sure you don't create a situation akin to a Van de Graaff generator where oil goes through 3kV at the anode,; /archives//html/Amps/2015-03/msg00084.html (7,580 bytes)
6. Re: [Amps] more - oil bath GS-35b (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 31 Mar 2015 21:36:06 -0400; No different than with a transmission cooler, especially a fan cooled external one. Carl KM1H Correct! The faster the oil flow in the tube cooler, the better the cooling. But not so for the radiator.; /archives//html/Amps/2015-04/msg00002.html (9,831 bytes)
7. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 31 Mar 2015 19:49:59 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: "But not so for the radiator."? There seems to be something wrong with the logic here. Heat transfer doesn't care whether it goes from the tube to the oi; /archives//html/Amps/2015-04/msg00003.html (8,384 bytes)
8. Re: [Amps] more - oil bath GS-35b (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Tue, 31 Mar 2015 23:22:22 -0500; How is the radiator different from the tube? Heat transfer is about temperature difference, flow rate and turbulent flow. The greater temperature difference the faster the heat transfer. If you slow; /archives//html/Amps/2015-04/msg00004.html (9,778 bytes)
9. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Chris Wilson <chris@chriswilson.tv>; Date: Wed, 1 Apr 2015 16:37:16 +0100; Hello Bill, There are optimum flow rates based on heat exchanger coolant medium, be it gaseous, or fluid, the type of liquid, and its viscosity. It also depends on the surface area of the inside and; /archives//html/Amps/2015-04/msg00006.html (10,831 bytes)
10. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Wed, 01 Apr 2015 11:08:26 -0600; The flow through the radiator has to be the same as the flow around the tube. The secret is to spend more time in the radiator which has a larger surface area than the tube. Tom W0IVJ If you slow dow; /archives//html/Amps/2015-04/msg00008.html (11,815 bytes)
11. Re: [Amps] more - oil bath GS-35b (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Wed, 1 Apr 2015 11:22:14 -0600; I haven't thought about this deeply, but I'm thinking the rate of heat transfer to the oil bath depends only on the temperature difference between the oil (adjacent to the tube anode) and the anode t; /archives//html/Amps/2015-04/msg00010.html (10,445 bytes)
12. [Amps] more - oil bath GS-35b (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 1 Apr 2015 10:35:19 -0700; There are optimum flow rates based on heat exchanger coolant medium, be it gaseous, or fluid, the type of liquid, and its viscosity. It also depends on the surface area of the inside and outside elem; /archives//html/Amps/2015-04/msg00011.html (13,361 bytes)
13. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Wed, 1 Apr 2015 12:07:42 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: You said it better than I did. Sounds right to me. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com h; /archives//html/Amps/2015-04/msg00012.html (8,562 bytes)
14. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Thu, 02 Apr 2015 08:13:41 +1300; Thanks greatly Chris for your additions there. It would have been a lot of work for me to make clear examples like that, but you see them regularly so can comment concisely. Most of my lessons learne; /archives//html/Amps/2015-04/msg00013.html (12,182 bytes)
15. Re: [Amps] more - oil bath GS-35b (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Wed, 1 Apr 2015 20:24:38 +0000; Comparing water cooled engines and oil cooled transmitting tubes does not work. Coolant in engines is near boiling point which means that there is always a chance of state change, ie steam. Cavitatio; /archives//html/Amps/2015-04/msg00017.html (16,240 bytes)
16. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 01 Apr 2015 20:49:02 +0000; You have tempted me to jump into the battle, guys, despite the more peaceful part of me saying "don't"! Some facts: - Oil, water, and most other liquid coolants, have very poor thermal conductivity,; /archives//html/Amps/2015-04/msg00018.html (11,862 bytes)
17. Re: [Amps] more - oil bath GS-35b (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Wed, 1 Apr 2015 16:02:13 -0500; Yes there is a limit for flow rate in the heat exchanger. When the inlet and outlet temperature become the same then higher flow rates will not help. However with inlet and outlet temperatures near t; /archives//html/Amps/2015-04/msg00019.html (17,767 bytes)
18. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Thu, 02 Apr 2015 12:54:07 +1300; On 02/04/15 10:05, amps-request@contesting.com wrote: Once the system has reached equilibrium the radiator is doing all it can with a given air flow. No, I do not want the cooling system running at m; /archives//html/Amps/2015-04/msg00022.html (12,915 bytes)
19. Re: [Amps] more - oil bath GS-35b (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Thu, 2 Apr 2015 00:32:45 +0000; So, obviously you will transfer more heat if the anode temperature is 700 degrees C. but that also would be the flash point for the oil. If it is a radiation cooled tube the heat transfer is proporti; /archives//html/Amps/2015-04/msg00023.html (13,280 bytes)

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