Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2902404 for flyrotary@lancaironline.net; Tue, 23 Dec 2003 10:12:33 -0500 Received: from rad ([68.212.7.74]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20031223151232.CSBO8082.imf24aec.mail.bellsouth.net@rad> for ; Tue, 23 Dec 2003 10:12:32 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: dual EWP plumbing? Date: Tue, 23 Dec 2003 09:12:34 -0600 Message-ID: <033e01c3c967$3175e410$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_033F_01C3C934.E6DB7410" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_033F_01C3C934.E6DB7410 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable I am trying to understand this plumbing scheme. Where in the circuit are = the water pumps? Are they after the "Y splitter", or on the line going from = the core to the Meziere inlet?=20 =20 They will be in the return line from the cores, to the engine. =20 =20 The pumps are likely to do better at 'pushing' the liquid rather than pulling it, so you want the outlet of the pump going into the evaporator core.=20 =20 Actually, this is why I figured they'd be better in the return line. = It's also nice to keep the coolant pressure in the engine as high as = possible, so I figured it made sense to have the pumps feeding directly to the = engine. =20 One operational concern is if you are operating on one core, and the thermostat calls for the second pump, when it turns on, it is going to = be delivering 'cold' fluid that has been stagnant in the core to the = engine. you 'might' end up with oscillations in the cycling of the pump. Will = this cause a problem? Bill Schertz KIS Cruiser # 4045=20 =20 Hmmm, good question. I don't know if that will be a problem or not. = The one way valves require .5psi to flow, so even if the pump is off, there might still be some flow. Unfortunately, I just don't have a feel for = how much flow, if any there will be. =20 =20 BTW, I do appreciate the comments. Fortunately, the difference between = the two plumbing schemes is a simple modification. I guess I'm just trying = to decide if there's any good that can come from running one pump per core. = =20 =20 Cheers, Rusty =20 ------=_NextPart_000_033F_01C3C934.E6DB7410 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
I am trying to understand this = plumbing=20 scheme. Where in the circuit are the water pumps? Are they after the "Y=20 splitter", or on the line going from the core to the Meziere inlet? 
 
They will be in the return line from the = cores, to the=20 engine.  
 
   The pumps are likely to = do better=20 at 'pushing' the liquid rather than pulling it, so you want the outlet = of the=20 pump going into the evaporator core. 
 
Actually, this is why I figured they'd be = better in the=20 return line.  It's also nice to keep the coolant pressure in the = engine as=20 high as possible, so I figured it made sense to have the pumps feeding = directly=20 to the engine.    
 
One operational concern is if you are = operating on=20 one core, and the thermostat calls for the second pump, when it turns = on, it is=20 going to be delivering 'cold' fluid that has been stagnant in the core = to the=20 engine. you 'might' end up with oscillations in the cycling of the pump. = Will=20 this cause a problem?
Bill Schertz
KIS Cruiser # 4045 
 
Hmmm,=20 good question.  I don't know if that will be a problem or = not. =20 The one way valves require .5psi to flow, so even if the pump = is off,=20 there might still be some flow.  Unfortunately, I just = don't have=20 a feel for how much flow, if any there will = be.  
 
BTW, I do=20 appreciate the comments.  Fortunately, the difference between = the=20 two plumbing schemes is a simple modification.  I guess I'm = just=20 trying to decide if there's any good that can come from running one = pump=20 per core.  
 
Cheers,
Rusty
 
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