X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao06.cox.net ([68.230.241.33] verified) by logan.com (CommuniGate Pro SMTP 5.0c5) with ESMTP id 775902 for flyrotary@lancaironline.net; Fri, 21 Oct 2005 14:59:49 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.33; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao06.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20051021185825.PILS24014.fed1rmmtao06.cox.net@BigAl> for ; Fri, 21 Oct 2005 14:58:25 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: specific heat of air Date: Fri, 21 Oct 2005 11:59:02 -0700 Message-ID: <000001c5d671$80dd4340$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5D636.D47E6B40" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5D636.D47E6B40 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ed, or Bill, or somebody; help me out here. I was reviewing my calcs = for air flow requirements, and find I used 0.02 Btu/cu. ft -F for the = specific heat of air. I don't know where that came from, and can only find it in joules/Kg - K. By the time I do all the conversions to British units = and mass to volume I now get quite a different number. =20 What is a good number for air at about 1 atmosphere and, say 90F; in Btu = per cu ft per degree F? =20 Thanks, =20 Al ------=_NextPart_000_0001_01C5D636.D47E6B40 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Ed, or Bill, or somebody; help me out here. I = was reviewing my calcs for air flow requirements, and find I used 0.02 = Btu/cu. ft –F for the specific heat of air. I don’t know where that came = from, and can only find it in joules/Kg – K. By the time I do all = the conversions to British units and mass to volume I now get quite a = different number.

What is a good number for air at about 1 atmosphere = and, say 90F; in Btu per cu ft per degree F?

Thanks,

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