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.
Lan honen helburua da eguzki-kolektoreen egungo egoeraren informazioa ematea, eraikuntza-sektorean. Energia trantsiziorako giltzarri bat da eguzki-energia termikoa eta, horregatik, iturria ustiatzeko teknologiak eta horien funtzionamendu-tarteak ezagutu behar dira, kontuan hartuz, batez ere, Espainiako eguzki-energiaren egungo egoera eta eraikinen instalazio espezifikoak. Egun, ohiko eguzki-sistemak instalatzen badira ere, hain ohikoak ez diren beste konfigurazio batzuk ere badaude. Hori dela eta, azken urteen aurkikuntzak aintzat hartu behar dira eguzki-kolektoreen material, geometria eta fluido bero-eramaile berriak ezagutarazteko. Gainera, eguzki-sistemak elementu arkitektonikoetan integra daitezke eta eguzki-hozkuntzaren aplikazioak eta klimatizazio-sareak ere bultza daitezke. Ondorioz, eguzki-energiaren aplikazio termikoak aldakorrak eta moldagarriak direla frogatzen da, eraikuntzako edozein eskari termikorako.
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