Return-Path: Received: from [216.52.245.18] (HELO ispwestemail2.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 395910 for flyrotary@lancaironline.net; Mon, 06 Sep 2004 22:51:05 -0400 Received-SPF: none receiver=logan.com; client-ip=216.52.245.18; envelope-from=wschertz@ispwest.com Received: from 7n7z201 (unverified [67.136.145.219]) by ispwestemail2.mdeinc.com (Vircom SMTPRS 3.2.315.0) with SMTP id for ; Mon, 6 Sep 2004 19:50:32 -0700 Message-ID: <02c501c49485$6d0d5cd0$d5918843@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Water pump problem Date: Mon, 6 Sep 2004 21:50:20 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02C2_01C4945B.812F1DE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_02C2_01C4945B.812F1DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageBear in mind that the cores were designed for coolant = evaporation, not for water flow heat transfer. It sounds like they had a = design that put the liquid coolant in the bottom of the evaporator, and = then relied on percolation, i.e. letting the fluid boil in the core, = with the bubbles forcing the liquid around and up the core to the exit. Evaporators (2-phase heat transfer) are more efficient in a 'flooded' = mode, so by having the plate in the header tank, the liquid could flow = into the bottom of the core, absorb heat, a bubble form and be forced = along one of the tubes until it reaches a riser in the header tank, then = out through the top 2". This would work great for a air-conditioning = core, but not for our use.=20 My cores were mounted (in the car) with one header tank down where the = liquid was fed, and the other header tank up where the vapor was = withdrawn. If his were mounted with both tubes up (in the car), then the = explanation above makes sense. In any case, you need a direct shot from top to bottom in both header = tanks in our use as water coolers. Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, September 06, 2004 8:35 PM Subject: [FlyRotary] Re: Water pump problem No. It had one tube in each of the tanks. Both in the top. One = tank is blocked off by a plate about 2" down from the top. The other = tank originally had a tube in it internally that extended to within an = inch or so of the bottom. =20 Does that make sense ? =20 I must be misunderstanding something, because I don't see how the = original configuration could have been using the whole core in the car. = Let's forget that for now though. =20 You should now have a tube in each tank. Both tanks should be open = from top to bottom, meaning that you'd have to have drilled a hole = through the blocking plate that was installed in the tank. If you = didn't open up the blocking plate, you're only using the top two inches = of the core, which would explain why that's all that's getting hot. =20 To rephrase this another way, one tube should come into the top of one = tank. The liquid running into the tank should be able to go through = every one of the flat tubes that join the tank. The liquid should be = able to come out every one of those flat tubes in the other tank, and go = up and out through the outlet tube. Is that what you have now? =20 If the above wasn't clear, I'm afraid we're going to have to resort to = drawings :-) Cheers, Rusty (glad the South FL boys survived) =20 ------=_NextPart_000_02C2_01C4945B.812F1DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Bear in mind that the cores were = designed for=20 coolant evaporation, not for water flow heat transfer. It sounds like = they had a=20 design that put the liquid coolant in the bottom of the evaporator, and = then=20 relied on percolation, i.e. letting the fluid boil in the core,  = with the=20 bubbles forcing the liquid around and up the core to the = exit.
 
Evaporators (2-phase heat transfer) are = more=20 efficient in a 'flooded' mode, so by having the plate in the header = tank, the=20 liquid could flow into the bottom of the core, absorb heat, a bubble = form and be=20 forced along one of the tubes until it reaches a riser in the header = tank, then=20 out through the top 2". This would work great for a air-conditioning = core, but=20 not for our use.
 
My cores were mounted (in the car) with = one header=20 tank down where the liquid was fed, and the other header tank up where = the vapor=20 was withdrawn. If his were mounted with both tubes up (in the car), then = the=20 explanation above makes sense.
 
In any case, you need a direct shot = from top to=20 bottom in both header tanks in our use as water coolers.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Monday, September 06, = 2004 8:35=20 PM
Subject: [FlyRotary] Re: Water = pump=20 problem

No.  It had one tube in each of = the=20 tanks.  Both in the = top.   One tank is blocked = off by a=20 plate about 2=94 down from the top. =20 The other tank originally had a tube in it internally that = extended to=20 within an inch or so of the = bottom.

 

Does=20 that make sense ?

 

 

I must be misunderstanding = something,=20 because I don't see how the original configuration could have been = using the=20 whole core in the car.  Let's forget that for now though. =20

 

You should now have a = tube in each=20 tank.  Both tanks should be open from top to bottom, meaning that = you'd=20 have to have drilled a hole through the blocking plate that was = installed in=20 the tank.  If you didn't open up the blocking plate, you're = only=20 using the top two inches of the core, which would explain why that's = all=20 that's getting hot.  

 

To rephrase this = another way, one=20 tube should come into the top of one tank.  The liquid running = into the=20 tank should be able to go through every one of the flat tubes that = join the=20 tank.  The liquid should be able to come out every one of those = flat=20 tubes in the other tank, and go up and out through the outlet = tube. =20 Is that what you have = now?  

 

If the above wasn't clear, = I'm=20 afraid we're going to have to resort to drawings=20 :-)

 

Cheers,

Rusty (glad the South = FL boys=20 survived)   

 

 

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