Fixed bugs that broke energy exchange.  Energy is now exchanged between the burners and the beaker.  You can see by putting the beaker on a burner and heating it for a bit.  The energy chunks don't work right yet, but steam comes out.  And if you switch it to cool, you can make the steam disappear.  I don't think energy exchange with the air works perfectly yet, though, because it won't cool down over time.