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Maximizing thermal performance of building ventilation using geothermal and wastewater heat
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy and Climate Studies, ECS.ORCID iD: 0000-0002-5938-4614
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy and Climate Studies, ECS.ORCID iD: 0000-0001-6266-8485
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy and Climate Studies, ECS.ORCID iD: 0000-0001-5902-2886
2019 (English)In: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 143, p. 90-98Article in journal (Refereed) Published
Abstract [en]

An efficient use of waste heat recovery and geothermal heat can play an important role in lowering the overall energy use of buildings. This study evaluated the potential of geothermal energy and heat recovery from residential wastewater to reduce the energy need of building-ventilation in cold climates. The performance of the mechanical ventilation with heat recovery (MVHR) system in a multi-family building located in central Sweden was studied. The focus of the investigation was on reduction of frosting in the air handling unit during the coldest months. Three configurations of one air preheating system fed by two renewable heat sources, wastewater and geothermal energy, were studied. It was found that compared to building without an air preheating system, the suggested air preheating systems reduced the defrosting time to 25%. By controlling and maintaining the preheated air temperature to slightly above the defrosting start, air heat recovery efficiency of MVHR above 80% was achieved for 90% of the studied time during heating season when frosting occurs. The energy need for the circulation pumps in the suggested air preheating systems was 5% of the recovered thermal energy from wastewater. The simulation results suggested that the air preheating system using wastewater heat recovery with a temperature-stratified storage tank was the most efficient one among the studied systems.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 143, p. 90-98
Keywords [en]
Renewables, Wastewater heat recovery, Geothermal heating, Balanced mechanical ventilation, Sustainability, Energy saving
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-245125DOI: 10.1016/j.resconrec.2018.12.025ISI: 000458222600010Scopus ID: 2-s2.0-85058947734OAI: oai:DiVA.org:kth-245125DiVA, id: diva2:1296549
Note

QC 20190315

Available from: 2019-03-15 Created: 2019-03-15 Last updated: 2019-08-30Bibliographically 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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