ENERGY FLEXIBILITY OF A LARGE-SCALE OFFICE BUILDING: INFLUENCE OF OCCUPANCY AND FLOW VARIATION OF A TWO PIPE ACTIVE BEAM SYSTEM FOR SIMULTANEOUS HEATING AND COOLING
Author
Dinga, Florian Cosmin
Term
4. Term
Education
Publication year
2018
Submitted on
2018-07-25
Pages
44
Abstract
Denne kandidatafhandling fra uddannelsen Building Energy Design på Aalborg Universitet undersøger en stor kontorbygning med et to-rørs system, der kan levere både opvarmning og køling samtidig. Afhandlingen ser på, hvordan ændringer i belægning (hvor mange personer der er til stede) og i systemets flow påvirker både systemets ydeevne og bygningens energifleksibilitet – evnen til at flytte energiforbruget over tid, for eksempel efter elpriser. Vi fastlagde spændet for variationer i belægning og flow, opstillede en basissimulation og tre alternative cases og afprøvede tre styringsstrategier i hver. I alt blev 12 cases simuleret med EnergyPlus, et program til simulering af bygningers energiforbrug. Resultaterne viser, at variationer i belægning tydeligt påvirker to-rørssystemets ydeevne. De viser også, at en flowreduktion på omkring 15% forbedrer energibesparelserne uden mærkbar påvirkning af termisk komfort. Blandt de testede strategier gav en styring, der reagerer på elprisniveauer, de bedste resultater.
This master’s thesis from the Building Energy Design program at Aalborg University examines a large office building with a two-pipe system that can provide heating and cooling at the same time. It studies how changes in occupancy (how many people are present) and in system flow rates affect both the system’s performance and the building’s energy flexibility—the ability to shift energy use over time, for example in response to electricity prices. We defined ranges for occupancy and flow variations, created a baseline model and three alternative cases, and tested three control strategies in each. In total, 12 cases were simulated using EnergyPlus, a program for building energy simulation. The results show that occupancy variation clearly affects the two-pipe system’s performance. They also show that cutting the flow by about 15% improves energy savings with no notable impact on thermal comfort. Among the control approaches tested, the strategy that responds to electricity price levels gave the best results.
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