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Control algorithms for PV and Heat Pump system using thermal and electrical storage
Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik. Uppsala universitet.ORCID-id: 0000-0003-0402-8433
Uppsala universitet, Fasta tillståndets fysik.ORCID-id: 0000-0001-6745-3635
Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik.
2016 (Engelska)Ingår i: Proceedings of the 11th ISES EuroSun 2016 International Conference on Solar Energy for Buildings and Industry, Palma de Mallorca, Spain, 11-14 October 2016, International Solar Energy Society , 2016Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Abstract [en]

In this study a detailed model of a single-family house with an exhaust air heat pump and photovoltaic system is developed in the simulation software TRNSYS. The model is used to evaluate three control algorithms using thermal and electrical storage in terms of final energy, solar fraction, self-consumption and seasonal performance factor. The algorithms are tested and compared with respect to energetic improvement for 1) use of the heat pump plus storage tank for domestic hot water and space heating, 2) use of the electrical storage in batteries and 3) use of both electrical and thermal storage. Results show the highest increase of self-consumption to 50.5%, solar fraction to 40.6% and final energy decrease to 6923 kWh by implementing the third algorithm in a system with 9.36 kW PV capacity and battery storage of 10.8 kWh. The use of electrical energy storage has higher positive impact compared to the thermal storage with the settings and component sizes used. The combined use of thermal storage and batteries leads to final energy savings that are nearly the same as the combined savings of thermal storage and batteries separately, showing that they are mostly independent of one another for the settings of this study.

Ort, förlag, år, upplaga, sidor
International Solar Energy Society , 2016.
Nyckelord [en]
Photovoltaics, heap pump, thermal storage, electrical storage, solar fraction, self-consumption
Nationell ämneskategori
Energiteknik
Forskningsämne
Forskningsprofiler 2009-2020, Energi och samhällsbyggnad
Identifikatorer
URN: urn:nbn:se:du-25960DOI: 10.18086/eurosun.2016.08.13ISI: 000426895100130OAI: oai:DiVA.org:du-25960DiVA, id: diva2:1138495
Konferens
EuroSun 2016 International Conference on Solar Energy for Buildings and Industry
Tillgänglig från: 2017-08-16 Skapad: 2017-09-05 Senast uppdaterad: 2021-11-12Bibliografiskt granskad
Ingår i avhandling
1. Smart control of PV and exhaust air heat pump systems in single-family buildings
Öppna denna publikation i ny flik eller fönster >>Smart control of PV and exhaust air heat pump systems in single-family buildings
2019 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Recently, decentralized household photovoltaic (PV) systems have become more affordable and there is a tendency to decrease subsidies for the PV excess electricity fed into the grid. Therefore, there is growing interest in methods to increase the self-consumption (SC), which is the part of the electricity produced by PV and directly consumed on buildings. It has been found that battery storage is an effective way to achieve this. When there is a heat pump system installed, thermal energy storage using the thermal mass of the building or hot water tanks, can also be used to increase the household self-sufficiency and minimize the final energy use. The main aim of this thesis is to develop operational control strategies for the heating system of a single-family house with an exhaust air heat pump, a photovoltaic system and energy storage. In order to accomplish this a detailed system model was developed in TRNSYS 17, which includes a six-zone building model and the heat pump control. Moreover, these control strategies include short-term weather and price forecast services.  Another objective is to evaluate the impact on the benefit of these control strategies in terms of energy use and economic performance for a wide range of boundary conditions (country/climate, electricity prices, occupancy and appliance loads).  Results show that the control using a forecast of dynamic electricity price in most locations leads to greater final energy savings than those due to the control using thermal storage for excess PV production. The exception is Sweden, where the result is the opposite. Moreover, the addition of battery storage leads to greater decreases in final energy than the use of the thermal storage (TH mode), which is limited to the thermal mass of the building and small hot water tank of the compact heat pump. As far as the impact of the advanced control (combined use of TH and PRICE) on cost savings is concerned, savings (up to 175 €) are possible in Spain and in Germany. The design of the TH and PRICE mode show low computational complexity that can be easily implemented in existing heat pump controllers. Additionally, the PRICE mode should have no capital and running cost for the end user while the TH mode might require an external electricity meter. Another yet implication with the TH mode is the need to activate the room thermostatic valve.

Ort, förlag, år, upplaga, sidor
Uppsala: Uppsala University, 2019. s. 50
Nyckelord
photovoltaics, heat pump, forecast services, thermal storage, electrical storage, control algorithms
Nationell ämneskategori
Energiteknik
Forskningsämne
Energi och samhällsbyggnad, TESHP Test av solvärmepumpsystem
Identifikatorer
urn:nbn:se:du-32581 (URN)
Opponent
Handledare
Forskningsfinansiär
KK-stiftelsen, 20160171
Tillgänglig från: 2019-12-17 Skapad: 2020-04-28 Senast uppdaterad: 2021-11-12Bibliografiskt granskad

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