The present paper deals with modeling of various low-exergy system components and their integrationinto the energy system for buildings and small communities. The exergy content of a certain amount ofenergy is defined as the part of this energy that can be used to produce mechanical energy. The qualityof a certain amount of energy is defined as the relative exergy content of this energy. Most of ourbuildings with their heating and cooling systems today are built for conversion of high quality energysources to low quality use with a huge destruction of the available exergy as a result.
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