 about us enersim ltd specializes in helping building designers and owners make their new or existing buildings more energy efficient we do this by calculating a building s energy consumption using computerbased energy simulation tools we can then document energy savings for high performance building programs like leed or energy star  and or analyze a range of energy efficiency measures to determine which would yield the greatest benefit in addition to whole building energy modeling we also conduct daylighting studies and perform life cycle cost analysis  christian stalberg principal between 2011 and 2016 stalberg was the north american representative for designbuilder software ltd in charge of sales training and support he has taught energy modeling classes at both pacific gas and electric and southern california edison s training centers christian has a schools energy auditor certification from the california energy commission  840328 he also received training in california state energy standards title 24 code compliance from the association of bay area governments  between 1984 and 1986 he was cofounder and senior partner in energetic systems a commercial and residential building energy analysis firm located in the san francisco bay area energetic systems conducted a variety of energetic and related econometric analyses for both the private and public sector energetic systems specialized in california state energy standards title 24 code compliance customers consisted of architects general contractors builders developers and homeowners energetic systems used energy analysis computer programs including calpas fchart doe21b micropas and sunpas after a twenty plus year hiatus working in the telecomputing field christian has been modeling buildings and teaching energy modeling since 2008  