Article 40443 of sci.engr.heat-vent-ac: Path: news.misty.com!not-for-mail From: nicksanspam@ece.villanova.edu Newsgroups: alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac Subject: Re: R-values of reflective insulation materials Date: 29 Apr 2008 09:49:46 -0400 Organization: Villanova University Lines: 16 Message-ID: References: <4816f3dd@clear.net.nz> NNTP-Posting-Host: acadia.ece.villanova.edu X-Trace: max.inside.misty.com 1209473371 15895 153.104.44.130 (29 Apr 2008 12:49:31 GMT) X-Complaints-To: abuse@misty.com NNTP-Posting-Date: Tue, 29 Apr 2008 12:49:31 +0000 (UTC) Xref: news.misty.com alt.solar.thermal:30375 alt.home.repair:1015211 sci.engr.heat-vent-ac:40443 Solar Mike wrote: >What version of basic is this, looks like GWBasic... Yup. IIRC, gwbasic.exe is still available free from a web site and runs from a DOS prompt. BWbasic is almost identical and runs with Ubuntu linux. The new ASHRAE comfort spec also contains a gwbasic program. It's not easy to estimate the US R-value of a reflective insulation system. It varies from about 1 to 10, depending on emissivities, airspace thickness, mean temperature, temperature difference, and the direction of heatflow. The complex table in the ASHRAE HOF rarely matches real situations, but this program can help with that. Nick