Comparative analysis of Heat Valve Ventilation System with Traditional HVAC System in terms of reducing carbon dioxide emission - Case Study GreenHUB House in Aalborg, Denmark

Krawczynski, Rafal Jan ; Dzidowska, Anna Martyna

4. Term

Building Energy Design

2024

2024-01-11

151

Bygninger står for en stor del af det globale energiforbrug. Luftbaserede varmesystemer kan ifølge nyere studier reducere både anlægs- og driftsomkostninger. Der mangler dog i Danmark sammenlignende undersøgelser af den samlede miljøpåvirkning over hele livscyklussen for heat valve ventilation (HVV). Dette speciale er en sammenligning mellem HVV og traditionelle varme- og ventilationsløsninger i en kritisk lejlighed i GreenHUB House i Aalborg. Formålet var at vurdere, i hvilket omfang HVV kan bidrage til at nå målet om 2,5 kg CO2-ækv./m2/år og samtidig sikre et komfortabelt indeklima, især i fyringssæsonen. Energiforbruget blev analyseret i forskellige scenarier med varierende setpunkter (ønsket indetemperatur), brugerprofiler (hvordan boligen er beboet) og ventilationsaggregater med forskellig varmegenvinding. Simuleringerne blev gennemført i BSim, og livscyklusvurderingen (LCA) blev udført i LCAByg. Resultaterne viser, at HVV i scenarier med højere setpunkt og valg af aggregat med høj varmegenvinding gav bedre energieffektivitet og lavere miljøpåvirkning end traditionelle systemer. I disse tilfælde reducerede HVV den samlede miljøpåvirkning med op til 15 % og gav op til 7 % årlige energibesparelser, samtidig med at indeklimaet var tilfredsstillende. I andre scenarier havde det traditionelle system lavere energiforbrug og miljøpåvirkning. Overordnet peger resultaterne på, at HVV kan være fordelagtigt under bestemte drifts- og designvalg, men ikke nødvendigvis i alle situationer.

Buildings account for a large share of global energy use. Recent studies suggest that air-based heating systems can reduce both upfront and operating costs. However, in Denmark there is a lack of whole life-cycle comparisons of the environmental impact of heat valve ventilation (HVV). This thesis compares HVV with traditional heating and ventilation methods in a critical apartment case in the GreenHUB House in Aalborg. The aim was to assess how far HVV can help achieve a target of 2.5 kg CO2-eq/m2/year while maintaining a comfortable indoor environment, especially during the heating season. Energy performance was evaluated across scenarios with different temperature setpoints (desired indoor temperature), occupancy profiles (how the dwelling is used), and air handling units with different heat recovery levels. Simulations were carried out in BSim, and the life cycle assessment (LCA) was performed using LCAByg. The results show that in scenarios with higher setpoints and an air handling unit with higher heat recovery, HVV delivered better energy efficiency and lower environmental impact than traditional systems. In these cases, HVV reduced overall environmental impact by up to 15% and delivered up to 7% annual energy savings while keeping indoor comfort at acceptable levels. In other scenarios, the traditional system performed better on energy use and environmental impact. Overall, the findings indicate that HVV can be advantageous under certain design and operating choices, but not in all situations.

[This summary has been rewritten with the help of AI based on the project's original abstract]

CO2 ; HVAC ; HVV ; IAQ ; LCA ; Air-based heating system ; Thermal comfort

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