From owner-freebsd-hardware Thu Jun 22 4:22:19 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from endplay.inode.org (cpu1532.adsl.bellglobal.com [206.47.27.13]) by hub.freebsd.org (Postfix) with ESMTP id ED51537C27D for ; Thu, 22 Jun 2000 04:21:58 -0700 (PDT) (envelope-from dej@inode.org) Received: from coup.inode.org (coup.inode.org [172.16.2.203]) by endplay.inode.org (8.9.3/8.9.3) with SMTP id HAA21096 for ; Thu, 22 Jun 2000 07:21:54 -0400 (EDT) From: David Jones To: freebsd-hardware@freebsd.org Subject: Liquid cooled Date: Thu, 22 Jun 2000 07:17:05 -0400 X-Mailer: KMail [version 1.0.28] Content-Type: text/plain MIME-Version: 1.0 Message-Id: <00062207215406.00242@coup.inode.org> Content-Transfer-Encoding: quoted-printable Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Be careful when liquid-cooling the payload. Remember, the payload will be evacuated. Water boils at just over 0 C in= a vacuum. If you use water cooling, then you'd get water vapor all over th= e place upon evacuation, with possible condensation everywhere. Any cooling liquid would have to be kept in a closed system. How is the payload to be powered up? Does it run in "standby mode" until= and during the launch, only to go into mission mode for those five minutes? = Is there an external signal to indicate mission mode? If not, then the powe= r will be dissipated while the system is on the launch pad, and no amount of liq= uid will help. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message