Design and Operation of a Polygeneration System in Spanish Climate Buildings under an Exergetic Perspective

Ana Picallo-Perez and Jose Maria Sala-Lizarraga
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Ana Picallo-Perez: Research Group ENEDI, Department of Energy Engineering, University of the Basque Country (UPV/EHU), 48013 Bilbao, Spain
Jose Maria Sala-Lizarraga: Research Group ENEDI, Department of Energy Engineering, University of the Basque Country (UPV/EHU), 48013 Bilbao, Spain

Energies, 2021, vol. 14, issue 22, 1-21

Abstract: This work defines and analyzes the performance of a polygeneration system in five different locations in Spain to maintain the thermal comfort and air quality of an office building. The facility is based on a chiller and a CHP engine with PV panels that provide almost all the electricity demand of the chiller. According to the energy performance analysis results, the installation working in Bilbao is a full polygeneration system since no electricity needs to be imported from the grid in summer. To quantify the energy savings related to a separated production facility, polygeneration indicators (percentage of savings PES/PExS and equivalent electric efficiency EEE/EExE) have been calculated in energy and exergy terms. The main motivation for using exergy is based on the ambiguity that can arise from the point of view of the First Law. As expected, the exergetic indicators have lower values than the energetic ones. In addition, an in-depth analysis was conducted for the air-handling unit components. The study shows the behavior of components over the year and the efficiency values from both an energy and exergy point of view. From these facts, the need arises to develop methodologies based on exergy.

Keywords: exergy in office buildings; exergy polygeneration indicators; AHU exergy analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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