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Evaluation of Thermal Comfort in a Historic Building Refurbished to an Office Building with Modernized HVAC Systems
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, Energisystem och byggnadsteknik. Department of Construction, Gavlefastigheter Company, Gävle, Sweden.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.ORCID-id: 0000-0003-2023-689x
2020 (engelsk)Inngår i: Advances in Building Energy Research, ISSN 1751-2549, E-ISSN 1756-2201, Vol. 14, nr 2, s. 218-237Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Envelopes with low thermal performance are common characteristics in European historic buildings, causing higher energy demand and insufficient thermal comfort. This paper presents the results of a study on indoor environmental quality (IEQ), with special focus on thermal comfort, in the historic City Hall of Gävle, Sweden, now used as an office building. There are two modern heat recovery ventilation systems with displacement ventilation supply devices. The district heating network heats the building via pre-heat supply air and radiators. Summer cooling comes from electric heat pump ejecting heat into the exhaust ventilation air. A building management system (BMS) controls the heating, ventilation and air-conditioning (HVAC) equipment. The methodology included on-site measurements, BMS data logging and evaluating the occupants’ perception of a summer and a winter period indoor environment using a standardized questionnaire. In conclusion, indoor environmental quality in this historic building is unsatisfactory. Stuffy air, too high, too low and varying room temperatures, lighting problems and noise are constant issues. Although it is equipped with modern ventilation systems, there are still possibilities for improving thermal comfort by improved control strategies, since upgrading the building’s envelope is not allowed according to the Swedish Building Regulations in historic buildings with heritage value.

sted, utgiver, år, opplag, sider
Taylor & Francis , 2020. Vol. 14, nr 2, s. 218-237
Emneord [en]
Thermal comfort, historic building, HVAC
HSV kategori
Forskningsprogram
Hållbar stadsutveckling
Identifikatorer
URN: urn:nbn:se:hig:diva-29442DOI: 10.1080/17512549.2019.1604428ISI: 000533980800006Scopus ID: 2-s2.0-85064678798OAI: oai:DiVA.org:hig-29442DiVA, id: diva2:1302802
Forskningsfinansiär
Knowledge Foundation, 20150133Tilgjengelig fra: 2019-04-05 Laget: 2019-04-05 Sist oppdatert: 2022-09-19bibliografisk kontrollert
Inngår i avhandling
1. Evaluation of Thermal Comfort and Night Ventilation in a Historic Office Building in Nordic Climate
Åpne denne publikasjonen i ny fane eller vindu >>Evaluation of Thermal Comfort and Night Ventilation in a Historic Office Building in Nordic Climate
2020 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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).

sted, utgiver, år, opplag, sider
Gävle: Gävle University Press, 2020. s. 46
Serie
Licentiate thesis ; 9
Emneord
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
HSV kategori
Forskningsprogram
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 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2020-10-27 Laget: 2020-09-15 Sist oppdatert: 2021-04-01bibliografisk kontrollert

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