From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail0.rbsov.bogons.net (mail0.rbsov.bogons.net [IPv6:2001:4b10:0:1001::12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 4BB673B2A4 for ; Wed, 4 Sep 2024 19:13:05 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bogons.net; s=dkim2019; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Reply-To: References:In-Reply-To:Message-Id:Date:Subject:To:From:Sender:Cc:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=caAOSLrjzeJiVEa+xeiAEfvhoY1mYQ3L5xqZxkBIQ44=; b=RQQIGqPWYFWSzvXYj7rqdT4ifw 9Q2TpH7dL+mhv7YSjohA0wmExEZdoByRE4oXmdE1c4yr+NNkHY4akwcPH4y6DOzMrgf6/EzTxUQw3 21P9wFY9q3ve6JmGJExidI81WdM8IwQwBsYKdjUcIFu1yEwuqe8926nWRnkxCPSG4TML2MdYS0Vcr omNQNbRuTK4ag8zCq4e9o83Jl2BuaiaGUCBMRTAJBb4nEO3EBZVpWwOLYEFv9r4RcYje822a9/5XO bYlTwsltR+IVvVzySMZNE//O6e1WXXNNjAXljQDyvXtqli5o4lf2qIakBaFn9ogsprWGpibhtqqYS Y9bPYZBg==; Envelope-to: starlink@lists.bufferbloat.net Received: from vr0-g0-1-0.thdo.bogons.net ([85.158.40.74] helo=[IPv6:::ffff:132.185.28.54]) by mail0.rbsov.bogons.net with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1slzBL-0002yg-AF; Thu, 05 Sep 2024 00:13:02 +0100 From: "Brandon Butterworth" To: "Dave Taht" , "Dave Taht via Starlink" Date: Wed, 04 Sep 2024 23:12:58 +0000 Message-Id: In-Reply-To: References: Reply-To: "Brandon Butterworth" User-Agent: eM_Client/10.0.3530.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.2 X-Spam-Level: / X-Spam-Report: No, hits=0.2 required=5.0 tests=HELO_MISC_IP, SPF_HELO_NONE, SPF_PASS autolearn=disabled version=3.4.4 Subject: Re: [Starlink] lumen orbit X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Sep 2024 23:13:05 -0000 On 04/09/2024 15:48:51, "Dave Taht via Starlink"=20 wrote: >They plan to build a 5GW 4k solar square for data centers in orbit, >launched on starship: > >https://www.lumenorbit.com/ Maintenance call outs are going to be interesting >How are they going to cool this thing? With some big radiators. From https://www.nasa.gov/wp-content/uploads/2021/02/473486main_iss_atcs_overvie= w.pdf it seems that the ISS units take about 23 * 3.5m area for 35kW so about 440 W/m^2, if they are about the same then 5GW will need around 11 million sq metres. That seems a totally unfeasible number so either I messed up the calculation, or they have way more efficient radiators than NASA, or this is wishful thinking/investor grift. Compare it to the solar panels needed to collect that much power, current ISS panels are 190W/m^2 @ 14% efficiency, assuming they can get to earth efficiency of around 20% they might get 270W/m^2 so they are going to need more space. At lease one could be on the reverse of the other. Anyone got better numbers? brandon