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Thermal Model of a Solar Hybrid Module as the Heat Source for a CO2 Heat Pump
RULLOF, Johannes; Lambers, Klaus Jürgen; Blieske, Ulf et al.
2017In Proceedings of 2017 International Energy and Sustainability Conference (IESC 2016)
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Keywords :
PVT; heat pump; R744/CO2; direct-expansion; microchannel evaporator
Abstract :
[en] In recent years, the possibility of combining photovoltaics (PV) and solar thermal collectors into one solar hybrid module (PVT-module) has been increasingly investigated. PVT-modules produce thermal and electrical energy at the same time. Since the efficiency of a photovoltaic module decreases with increasing 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”. A common approach is to integrate the PVT-module directly as an evaporator in a heat pump system (PVT-direct). This paper presents a thermal model of a PVT-direct module as the heat source for a R744/CO2 heat pump. Due to the combined effect of flow channel patterns, solar radia-tion, the ambient conditions and possible condensation and frost formation, heat transfer and thermal distribution conditions of the PVT-direct evaporator are inevitably com-plicated to determine. The proposed thermal model of this hybrid solar module that has CO2 direct evaporation in microchannels will be used to simulate the behavior of the module under different climatic operating conditions. Fur-thermore, it will quantify all energy inputs and/or losses as well as their influence on the total energy supplied by the PVT-module. This will be used to investigate the overall CO2-PVT heat pump system performance in prospective simulations.
Disciplines :
Energy
Author, co-author :
RULLOF, Johannes ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC)
Lambers, Klaus Jürgen;  TH Köln > Cologne Institute for Renewable Energy (CIRE)
Blieske, Ulf;  TH Köln > 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 :
Thermal Model of a Solar Hybrid Module as the Heat Source for a CO2 Heat Pump
Publication date :
2017
Event name :
6th International Energy and Sustainability Conference (IESC)
Event organizer :
Farmingdale State College
Event place :
New York, United States
Event date :
from 19-10-2017 to 20-10-2017
Audience :
International
Journal title :
Proceedings of 2017 International Energy and Sustainability Conference (IESC 2016)
Peer reviewed :
Peer reviewed
Available on ORBilu :
since 10 January 2018

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