In order to reduce impact to environment, a qualitative approach of energy saving is global aspect that is
included in various forms of CO2 emissions, primary energy limitations and benchmarks in EU and member countries
policy. Exergy analysis allows expressing the quality of energy flows in comparison to ambient or other reference conditions.
Despite of this valuable information, this concept is not widely used in engineering practice. The article suggests
the calculation procedure for sessional or periodical thermodynamic (exergy) efficiency in relation to variable reference
conditions. Knowledge about defined procedures unlocks the possibility to fill up the implementation gap for building
system engineering practice where seasonal performance parameters are widely used to express efficiency. Prepared
algorithm allows determining seasonal or periodic thermodynamic efficiency of individual elements and energy transfer
chains in building energy systems. Defined calculation procedure workflow is suitable for integrated approach when
coupled heat transfer and fluid flow processes are explored in short time steps with dynamic simulation software tools.
Presented algorithm ensures result that fits in thermodynamically correct range 0-1 and helps to summarize separate
time step results. By adding duration of specific conditions, this analysis enables to identify critical peak periods and
base load conditions across operation period. The presented framework fills the gap in lack of systematic expression for
seasonal thermodynamic efficiency and suggests the process for calculation procedures workflow.
BUILDING ENERGY SYSTEMS OPERATION OPTIMIZATION WITH ICE STORAGE – A REAL TIME APPROACH
