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Frost reduction in mechanical balanced ventilation by efficient means of preheating cold supply air
Faculty of Engineering, Reutlingen University, Reutlingen, Germany.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Sustainable Buildings.ORCID iD: 0000-0002-5938-4614
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Sustainable Buildings. Uponor AB, Västerås, Sweden.ORCID iD: 0000-0001-6266-8485
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Sustainable Buildings. Bravida Holding AB, Hägersten, Sweden.ORCID iD: 0000-0001-5902-2886
2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This study has focused on evaluating the financial potential of wastewater and geothermal heat recovery systems in a multi-family building. The recovered heat was used to improve the performance of mechanical ventilation with heat recovery (MVHR) system during the coldest days in central Sweden. The main issue, which was targeted with these solutions, was to reduce frost formation in the system and hence increase its thermal efficiency. By looking at the life cycle cost over a lifespan of 20 years, the observed systems were being evaluated economically. Furthermore, statistical analyses were carried-out to counter the uncertainty that comes with the calculation. It was found that the studied wastewater systems have a high possibility of generating savings in this period, while the one fed by geothermal energy is less likely to compensate for its high initial cost. All designed systems however, managed to reduce operational cost by 35-45% due to lower energy usage.

Place, publisher, year, edition, pages
2019.
National Category
Building Technologies
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-257495OAI: oai:DiVA.org:kth-257495DiVA, id: diva2:1347240
Conference
The 10th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings (IAQVEC), 5-7 September 2019, Bari, Italy
Available from: 2019-08-30 Created: 2019-08-30 Last updated: 2019-09-03Bibliographically approved
In thesis
1. Sustainable building ventilation solutions with heat recovery from waste heat
Open this publication in new window or tab >>Sustainable building ventilation solutions with heat recovery from waste heat
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The energy used by building sector accounts for approximately 40% of the total energy usage. In residential buildings, 30-60% of this energy is used for space heating which is mainly wasted by transmission heat losses. A share of 20-30% is lost by the discarded residential wastewater and the rest is devoted to ventilation heat loss.

 

The main objective of this work was to evaluate the thermal potential of residential wastewater for improving the performance of mechanical ventilation with heat recovery (MVHR) systems during the coldest periods of year. The recovered heat from wastewater was used to preheat the incoming cold outdoor air to the MVHR in order to avoid frost formation on the heat exchanger surface.

 

Dynamic simulations using TRNSYS were used to evaluate the performance of the suggested air preheating systems as well as the impact of air preheating on the entire system. Temperature control systems were suggested based on the identified frost thresholds in order to optimally use the limited thermal capacity of wastewater and maintain high temperature efficiency of MVHR. Two configurations of air preheating systems with temperature stratified and unstratified tanks were designed and compared. A life cycle cost analysis further investigated the cost effectiveness of the studied systems.

 

The results obtained by this research work indicated that residential wastewater had the sufficient thermal potential to reduce the defrosting need of MVHR systems (equipped with a plate heat exchanger) in central Swedish cities to 25%. For colder regions in northern Sweden, the defrosting time was decreased by 50%. The temperature control systems could assure MVHR temperature efficiencies of more than 80% for most of the heating season while frosting period was minimized. LCC analysis revealed that wastewater air preheating systems equipped with temperature stratified and unstratified storage tanks could pay off their costs in 17 and 8 years, respectively.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019
Series
TRITA-ABE-DLT ; 1928
Keywords
wastewater heat recovery, balanced mechanical ventilation, defrosting reduction, heat recovery efficiency, thermal load shifting, renewables
National Category
Building Technologies
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-256567 (URN)978-91-7873-297-5 (ISBN)
Presentation
2019-09-20, M108, Stora konferensrummet, Brinellvägen 23, Stockholm, 09:00 (English)
Opponent
Supervisors
Funder
Svenska Byggbranschens Utvecklingsfond (SBUF), D6563
Note

QC 20190830

Available from: 2019-08-30 Created: 2019-08-28 Last updated: 2019-08-30Bibliographically approved

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Nourozi, BehrouzWang, QianPloskic, Adnan

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