Energy flexibility of office buildings -Comparison on potential in different building types: Comparison on potential in different building types

Energy flexibility of office buildings -Comparison on potential in different building types

Pavlova, Kremena ; Kolev, Ivan Gospodinov

4. Term

Building Energy Design

2018

2018-01-10

52

Dette speciale undersøger energifleksibiliteten i danske kontorbygninger med fokus på, hvordan deres termiske masse—altså at vægge, gulve og andre materialer kan lagre varme eller kulde—kan bruges til at flytte energiforbruget over tid. Kontor- og administrationsbygninger i Danmark er opført i forskellige perioder og varierer derfor i termiske egenskaber, varmekapacitet, lufttæthed samt interne varmelaster fra mennesker og udstyr. Deres potentiale for energifleksibilitet forventes derfor at være forskelligt og undersøges og klassificeres systematisk. Studiet modellerer fire repræsentative bygningscases, som hver afspejler typiske konstruktioner fra deres opførelsestid. For hver case anvendes forskellige kombinationer af interne laster og solindfald. Bygningerne forsynes af et system, der både kan varme og køle ved hjælp af tvungen konvektion, dvs. varmeoverførsel ved at flytte luft. En prisbaseret fleksibilitetsstyring tilpasser driften til elprisen og aktiverer bygningernes termiske masse til at lagre eller afgive varme efter behov. Ydelsen for alle bygningsmodeller vurderes med måleparametre udviklet i studiet. Disse bruges til at sammenligne, hvor effektivt forskellige bygningstyper kan levere energifleksibilitet under varierende forhold.

This thesis explores the energy flexibility of Danish office buildings, focusing on how their thermal mass—the ability of walls, floors, and other materials to store heat or coolness—can be used to shift energy use over time. Office and administrative buildings in Denmark were built in different periods and therefore vary in thermal properties, heat capacity, airtightness, and the internal heat from people and equipment. Because of these differences, their potential for energy flexibility is expected to vary and is systematically examined and classified. The study models four representative building cases, each reflecting typical construction practices from its era. For each case, multiple combinations of internal loads and solar gains are applied. The buildings are served by a system that can both heat and cool using forced convection, meaning heat transfer by moving air. A price-based flexibility controller adjusts operation according to the electricity price, activating the thermal mass of the structures to store or release heat as appropriate. All building models are evaluated using metrics developed in the study. These metrics are used to compare how effectively different building types can provide energy flexibility under varying conditions.

[This abstract was generated with the help of AI]

energy flexibility

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