https://fire-safety.academy/w/index.php?action=history&feed=atom&title=File%3AFse-virtual-origin-v4.svg 2026-11-04T13:14:10Z Revision history for this page on the wiki MediaWiki 1.43.11 https://fire-safety.academy/w/index.php?title=File:Fse-virtual-origin-v4.svg&diff=2111&oldid=prev 2026-11-02T16:15:29Z

<p>Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity</p> <p><b>New page</b></p><div>== Summary ==<br /> Two sign conventions: in Heskestad&#039;s correlations z0 is positive above the fuel surface; in the Hasemi model used by OZone the virtual source distance is drawn below it. Based on Heskestad (2002), p. 2-6, and Cadorin et al. (2003), pp. 443 to 444.<br /> <br /> Original illustration for [[Virtual origin]], level 4 Expert.<br /> <br /> * Source basis: Heskestad (2002), p. 2-6 (z0 elevation above the fire source, negative below); Cadorin et al. (2003), p. 443 (Hasemi correlation for z&#039;) and p. 444 (Figure 7: virtual source level below the burner, distance z&#039; + H_F + r; redraw, do not copy)<br /> * Alt text: Two sketches of a fire: on the left z0 is measured upwards from the fuel, on the right the Hasemi virtual source distance is measured downwards.<br /> <br /> == Licensing ==<br /> New drawing by Fire Safety Academy. © Fire Safety Academy.</div>

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