X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao11.cox.net ([68.230.241.28] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1024022 for flyrotary@lancaironline.net; Mon, 27 Jun 2005 18:36:46 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.28; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao11.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050627223557.ILRA12158.fed1rmmtao11.cox.net@BigAl> for ; Mon, 27 Jun 2005 18:35:57 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: NPG + use in aircraft?? Date: Mon, 27 Jun 2005 15:36:09 -0700 Message-ID: <000001c57b68$9d9d8ad0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C57B2D.F14123D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C57B2D.F14123D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Rusty; can you quantify this statement:=20 =20 How much more does it cost?=20 =20 Over here, it's about $20/gallon plus shipping, which is considerably = more than normal antifreeze, and waaaaay more than distilled water. For cost estimates, you'd be better off to look this up from a local supplier, or contact Evan's about price and shipping down under. =20 What percentage poorer, is it in heat removal efficiency The specific heat of NPG at operating temp (180F) is 0.65; compared to = 0.8 for 50/50 EG/water, and 1.0 for water. So about 20% poorer than = EG/water and 35% poorer than water in carrying heat per unit of volume. =20 The viscosity of NPG at 180F is about 3.6 times that of EG/water, and = about 10 times that of water. Results in considerably higher pressure drop = around the loop and higher pumping power, lower flow rates. Works best in = large channel radiators, and with Evans high performance pumps. =20 The thermal conductivity is lower (can't find the data right now). I'm guessing about 30%. Results in lower heat transfer cooefficents. =20 Al ------=_NextPart_000_0001_01C57B2D.F14123D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

 

Rusty; can you quantify this = statement: 

 

 How much more does it = cost? 

 

Over here, it's = about $20/gallon plus shipping, which is considerably more than normal = antifreeze, and waaaaay more than distilled water.  For cost estimates, = you'd be better off to look this up from a local supplier, or = contact Evan's about price and shipping down under.  =   

What percentage poorer, is it in heat removal efficiency

The specific heat of NPG at = operating temp (180F) is 0.65;  compared to 0.8 for 50/50 EG/water, and 1.0 = for water.  So about 20% poorer than EG/water and 35% poorer than water = in carrying heat per unit of volume.

 

The viscosity of NPG at 180F is = about 3.6 times that of EG/water, and about 10 times that of water.  Results = in considerably higher pressure drop around the loop and higher pumping = power, lower flow rates.  Works best in large channel radiators, and with = Evans high performance pumps.

 

The thermal conductivity is lower = (can’t find the data right now).  I’m guessing about 30%.  = Results in lower heat transfer cooefficents.

 

Al

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