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On the Performance of Night Ventilation in a Historic Office Building in Nordic Climate
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik. (Energisystem)ORCID-id: 0000-0001-9806-4456
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik.ORCID-id: 0000-0001-9076-0801
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik. (Energisystem)ORCID-id: 0000-0003-2023-689x
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik.ORCID-id: 0000-0002-4007-3074
2020 (Engelska)Ingår i: Energies, E-ISSN 1996-1073, Vol. 13, nr 16, artikel-id 4159Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The effect of mechanical night ventilation on thermal comfort and electricity use for cooling of a typical historic office building in north-central Sweden was assessed. IDA-ICE simulation program was used to model the potential for improving thermal comfort and electricity savings by applying night ventilation cooling. Parametric study comprised different outdoor climates, flow rates, cooling machine’s coefficient of performance and ventilation units’ specific fan power values. Additionally, the effect of different door schemes (open or closed) on thermal comfort in offices was investigated. It was shown that night ventilation cannot meet the building’s total cooling demand and auxiliary active cooling is required, although the building is located in a cold climate. Night ventilation had the potential in decreasing the percentage of exceedance hours in offices by up to 33% and decreasing the total electricity use for cooling by up to 40%. More electricity is saved with higher night ventilation rates. There is, however, a maximum beneficial ventilation rate above which the increase in electricity use in fans outweighs the decrease in electricity use in cooling machine. It depends on thermal mass capacity of the building, cooling machine´s coefficient of performance, design ventilation rate, and available night ventilation cooling potential (ambient air temperature).

Ort, förlag, år, upplaga, sidor
MDPI, 2020. Vol. 13, nr 16, artikel-id 4159
Nyckelord [en]
night ventilation, historic buildings, office buildings, building energy simulation, IDA-ICE, Nordic climate
Nationell ämneskategori
Energiteknik
Forskningsämne
Hållbar stadsutveckling
Identifikatorer
URN: urn:nbn:se:hig:diva-33294DOI: 10.3390/en13164159ISI: 000564738300001Scopus ID: 2-s2.0-85090578033OAI: oai:DiVA.org:hig-33294DiVA, id: diva2:1457449
Forskningsfinansiär
KK-stiftelsen, 20150133Tillgänglig från: 2020-08-11 Skapad: 2020-08-11 Senast uppdaterad: 2023-08-28Bibliografiskt granskad
Ingår i avhandling
1. Evaluation of Thermal Comfort and Night Ventilation in a Historic Office Building in Nordic Climate
Öppna denna publikation i ny flik eller fönster >>Evaluation of Thermal Comfort and Night Ventilation in a Historic Office Building in Nordic Climate
2020 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Envelopes with low thermal performance are common characteristics in European historic buildings resulting in insufficient thermal comfort and higher energy use compared to modern buildings. There are different types of applications for the European historic buildings such as historic churches, historic museums, historic theatres, etc. In historic buildings refurbished to offices, it is vital to improve thermal comfort for the staff. Improving thermal comfort should not increase, preferably reduce, energy use in the building.

The overall aim in this research is to explore how to improve thermal comfort in historic buildings without increasing, preferably reducing, energy use with the application of non-intrusive methods. This is done in form of a case study in Sweden. Thermal comfort issues in the case study building are determined through a field study. The methods include field measurements with thermal comfort equipment, data logging on BMS, and evaluating the occupant’s perception of a summer and a winter period indoor environment using a standardized questionnaire. According to questionnaire and thermal comfort measurements results, it is revealed that the summer period has the most dissatisfied occupants, while winter thermal comfort is satisfactory – but not exceptionally good.

Accordingly, natural heat sinks could be used in form of NV, as a non/intrusive method, in order to improve thermal comfort in the building. For the historic building equipped with mechanical ventilation, NV strategy has the potential to both improve thermal comfort and reduce the total electricity use for cooling (i.e. electricity use in the cooling machine + the electricity use in the ventilation unit’s fans). It could decrease the percentage of exceedance hours in offices by up to 33% and reduce the total electricity use for cooling by up to 40%. The optimal (maximum) NV rate (i.e. the potential of NV strategy) is dependent on the thermal mass capacity of the building, the available NV cooling potential (dependent on the ambient air temperature), COP value of the cooling machine, the SFP model of the fans (low SFP value for high NV rate is optimal), and the offices’ door scheme (open or closed doors).

Ort, förlag, år, upplaga, sidor
Gävle: Gävle University Press, 2020. s. 46
Serie
Licentiate thesis ; 9
Nyckelord
historic buildings, office buildings, Nordic climate, thermal comfort, field (on-site) measurements, standardized questionnaire, building management system (BMS), night ventilation (NV), building energy simulation (BES), IDA-ICE
Nationell ämneskategori
Energisystem
Forskningsämne
Hållbar stadsutveckling
Identifikatorer
urn:nbn:se:hig:diva-33941 (URN)978-91-88145-54-3 (ISBN)978-91-88145-55-0 (ISBN)
Presentation
2020-11-12, Föreläsningssal - Rum 33203, Kungsbäcksvägen 47 (University of Gävle), Gävle, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2020-10-27 Skapad: 2020-09-15 Senast uppdaterad: 2021-04-01Bibliografiskt granskad

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Khosravi Bakhtiari, HosseinAkander, JanCehlin, MathiasHayati, Abolfazl

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