Follow up on yesterday's steam line "explosion," I saw a new 18 inch diameter expansion joint sitting next to the work site this morning. Since this is one of the most fragile part of a steam distribution system, I expect that the rupture of the existing joint caused the issue yesterday. The new "joint" is a internally pressurized SS bellows unit, usually the district energy folks around here use an externally pressurized unit - I wonder if this is just a temporary unit? The rupture looks like it make have occurred in the expansion joint manhole. The Duluth News Tribune has a photo of the aftermath.
Here is the control center of Building Performance at LHB. Dell notebook computer with Apple sticker and family crest. Sound system for after hour use. Pens, pencils and chopsticks, cups for coffee/tea, calculators (I keep four around) - and lots and lots of paper.
A few (very few) of the reference books I have around - several by Giovanni on passive building design and climate sensitive design, Kreith ad Kreader's Solar Engineering Textbook (although a newer version than used in my college days), an old NREL solar design guide, Olygay's Design with Climate, the manual for Trace 700, our primary load design and modeling tool.
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