23 September 2011

OPTIMIZING LOW CO2 SOLUTIONS WITH HEAT PUMPS TOWARDS NET-ZERO EXERGY COMMUNITIES OF THE FUTURE


Net-zero building design is a potentially transformational concept for the energy
systems of today. State-of-the art in net-zero building design, however, is not without major shortcomings, which may be addressed through net-zero exergy buildings (NZEXB). This paper provides key insight into the design principles of NZEXBs based on lessons that are learned from a premier net-zero exergy “ready” building in Ankara. These include building technology integration with better exergy matches in a multi-path approach and diversified
thermal energy storage as a buffer between the supply and demand of exergy to reduce CO2 emission impacts. Modeled data indicate that the building will attain “net” self-sufficiency with an annual exergy consumption of 60 kWh/m2-yr and proposed renewable exergy supply of 62 kWh/m2-yr. The building further has a 75% savings in compound CO2 emission impacts over a baseline building. The results indicate that NZEXBs are the “building blocks” for the more exergy-aware energy value chains of tomorrow. The strategies that were utilized at the
building level are thus applicable to being scaled-up to higher levels in the energy system. The paper concludes with key strategies for the net-zero exergy communities of the future.