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Simulation and analysis of a solar assisted heat pump system with two different storage types for high levels of PV electricity self-consumption
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (Future Energy)ORCID iD: 0000-0002-8287-8735
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (Future Energy)ORCID iD: 0000-0002-8604-9299
2014 (English)In: Solar Energy, ISSN 0038-092X, Vol. 103, no May 2014, 19-27 p.Article in journal (Refereed) Published
Abstract [en]

The incentives for PV-systems in Europe is being gradually lowered or ended. This makes a higher level of self-consumption interesting for owners of PV-systems.Sweden has an incentive of 35% of the investment cost for PV-systems. Unfortunately not all consumers can get this incentive. Therefore a high level of self-consumption will be necessary if the PV-systems are to be profitable in Sweden.A reference system with two different energy storage technologies is investigated in this paper. One system with 48. kW. h of batteries and one system with a hot water storage tank where the electricity is stored as heat.The research questions in this paper are:. Which storage system gives the highest level of PV electricity self-consumption?Are the storage systems profitable with the assumptions made in this paper?What are the levelized costs of electricity (LCOE) for the reference system with different storage system?The system with batteries has a self-consumption of 89% of the annual PV-electricity output and the system with a hot water storage tank has 88%.The system with batteries has a levelized cost of electricity two times higher than the system with a hot water storage tank.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 103, no May 2014, 19-27 p.
Keyword [en]
Photovoltaic; Energy storage systems; Energy system simulation; Self-consumption
National Category
Energy Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-24597DOI: 10.1016/j.solener.2014.02.013ISI: 000336351800003Scopus ID: 2-s2.0-84896866196OAI: oai:DiVA.org:mdh-24597DiVA: diva2:703277
Funder
Swedish Energy Agency
Available from: 2014-03-06 Created: 2014-03-06 Last updated: 2016-03-18Bibliographically approved
In thesis
1. Low energy buildings equipped with heat pumps for high self-consumption of photovoltaic electricity
Open this publication in new window or tab >>Low energy buildings equipped with heat pumps for high self-consumption of photovoltaic electricity
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The building sector is a prioritized area in the European Unions (EU) ambition to reduce the total final energy use by 20 %; lower the emission of greenhouse gases by 20 % and using energy 20 % more efficient by 2020. The residential sector in the European Union accounts for 27% of the un-ion’s final energy use and the EU views decentralized energy generation and heat pumps as important measures in reducing the energy demand in the building sector.

In recent years a rapid decrease in photovoltaic system prices has led to a growing popularity in Sweden. This fact in combination with a large in-crease of heat pump systems in residential buildings the last decade makes a combination of heat pumps and solar energy systems an interesting sys-tem configuration to analyze. In addition, the electricity price structure in Sweden and the uncertainty of the sustainability of the Swedish solar energy support schemes makes the topic of self-consumption an important research area.

Different solar energy systems for residential buildings and two different storage technologies, batteries and hot water storage tanks, have been analyzed with regards to profitability, solar energy fraction and self-consumption levels.

The results suggest that the system with a heat pump in combination with a photovoltaic system can be profitable and have high solar energy fractions and high levels of self-consumption and that the systems with storage are not profitable but give high levels of self-consumption and relatively high solar energy fractions. The hot water storage gives almost as high level of self-consumption as batteries but have half of the batteries levelized cost of electricity.

A system with a ground source heat pump and a solar thermal system are ineffective, unprofitable and give low solar energy fractions.

A system with a weather forecast controller gives a small increase in self-consumption and is unprofitable.

The proposed near energy zero building definition proposed by the Swedish National Board of Housing, Building and Planning in 2015 is unclear in terms of what electrical load the PV electricity reduces in the building. This has a fairly large impact on the building specific energy demand.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2016. 59 p.
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 200
National Category
Energy Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-31314 (URN)978-91-7485-255-4 (ISBN)
Public defence
2016-04-29, Delta, Mälardalens högskola, Västerås, 09:15 (English)
Opponent
Supervisors
Available from: 2016-03-18 Created: 2016-03-18 Last updated: 2016-04-04Bibliographically approved

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