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Experimental studies on the development of a solar hybrid module with an aluminum microchannel evaporator
RULLOF, Johannes; Lambers, Klaus Jürgen; Dick, Christian et al.
2016In Proceedings of 2016 International Energy and Sustainability Conference (IESC 2016)
Peer reviewed
 

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Keywords :
PVT; heat pump; R744/CO2; direct-expansion; microchannel evaporator; leakage current; parasitic capacitances
Abstract :
[en] In recent years, the possibility to combine photovoltaics (PV) and solar thermal collectors into one hybrid module (PVT-module) has been increasingly investigated. PVT-modules produce thermal and electrical energy at the same time. As the efficiency of a photovoltaic module decreases with temperature, the temperature of the heat transfer media is often limited to about 30 °C and the PVT-module is combined with a heat pump, which increases the temperature on the “warm side”. This paper deals with a PVT-module, which combines a microchannel based evaporator of a CO2 (R744) heat pump with a PV panel (PVT-direct). The PVT-direct overall system is reduced to the refrigerant circuit due to the direct refrigerant expansion in the PVT-module. A conventional PVT heat pump system has an additional glycol-water circuit. Since a pump and an additional heat exchanger for the secondary cycle were omitted, the system has increased efficiency. Due to lower module temperatures, the increase of the photovoltaic efficiency is a further advantage of the PVT-direct-module. To prove the feasibility of the PVT-direct heat pump system, the Cologne Institute for Renewable Energy (CIRE) is developing and modeling a test facility for this purpose within the research project “PVT-direkt”. Furthermore, a functional PVT-direct-module with a microchannel based evaporator was designed and built. Much importance has been given to experimental studies under laboratory conditions in order to investigate (1) the adjustment of the functionality and layout of the PVT-direct-module for characterizing the joining of brazed joints in aluminum microchannel evaporators and (2) the influence of the backside aluminum plate of the PVT-direct-module regarding leakage currents and parasitic capacitances. The overall results obtained in these experimental studies are analyzed in this paper.
Disciplines :
Energy
Author, co-author :
RULLOF, Johannes ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC)
Lambers, Klaus Jürgen;  TH Köln (University of Applied Sciences) > Cologne Institute for Renewable Energy (CIRE)
Dick, Christian;  TH Köln (University of Applied Sciences) > Cologne Institute for Renewable Energy (CIRE)
Blieske, Ulf;  TH Köln (University of Applied Sciences) > Cologne Institute for Renewable Energy (CIRE)
HADJI-MINAGLOU, Jean-Régis ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
SCHOLZEN, Frank  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
External co-authors :
yes
Language :
English
Title :
Experimental studies on the development of a solar hybrid module with an aluminum microchannel evaporator
Publication date :
2016
Event name :
5th International Energy and Sustainability Conference (IESC)
Event organizer :
TH Köln
Event place :
Cologne, Germany
Event date :
from 30-06-2016 to 01-07-2016
Audience :
International
Journal title :
Proceedings of 2016 International Energy and Sustainability Conference (IESC 2016)
Peer reviewed :
Peer reviewed
Available on ORBilu :
since 15 December 2017

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