«Div. of Energy Conversion, has street address Hörsalsvägen 7b,

 and is found on the 3rd floor (=Plan 4, in the elevator), the sign on the door says ENERGITEKNIK. 
My office is just inside the entrance of ENERGITEKNIK,
to the right about 3 m from the entrance. (room 4197)

     Hörsalsvägen is to the left of, and parallel to, the large parking area called Gibraltarvallen
(white area on map above).  The entrance at Hörsalsvägen 7b is marked with the red arrow.