Reference : Entwicklung und Modellierung eines Hybrid-Solarmodulkollektor-basierten Wärmepumpensy...
Dissertations and theses : Doctoral thesis
Engineering, computing & technology : Energy
Entwicklung und Modellierung eines Hybrid-Solarmodulkollektor-basierten Wärmepumpensystems auf der Basis von CO2 Direktverdampfung in Mikrokanälen
[en] Development and modeling of a hybrid solar module collector-based heat pump system based on CO2 direct evaporation in microchannels
Rullof, Johannes mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > >]
University of Luxembourg, ​​Luxembourg
Docteur en Sciences de l'Ingénieur
Hadji-Minaglou, Jean-Régis mailto
Scholzen, Frank mailto
Lambers, Klaus Jürgen mailto
Blieske, Ulf mailto
Kobou Ngani, Patrick
[de] Wärmepumpe ; Solarhybridmodul ; CO2/R744 ; Mikrokanalverdampfer ; Direktverdampfung ; Photovoltaik
[en] heat pump ; solar hybrid module ; microchannel evaporator ; photovoltaics
[en] As early as the end of the 1970s, heat pumps in combination with glycol-based large-area combined radiation environmental heat absorbers were developed as evaporators which, in comparison to forced convection-based air heat pumps, not only used ambient energy but also solar energy as an energy source. However, due to the falling oil prices after the oil crisis, this technology, which was for the most part not yet economical and moreover required large absorber surfaces, could not prevail. Due to the significant re-duction in the heating requirement of new buildings, nowadays much smaller absorber surfaces are needed in combination with a heat pump, which leads to a renewed interest in the combination of heat pumps and absorbers. Above all, the combination of thermal absorber, based on free convection and radiation, and photovoltaic (PV) in one module (PVT module), may be an alternative to forced convection-based air heat pumps. The use of solar energy as the heat source of the heat pump leads one to expect higher coef-ficients of performance by achieving higher evaporation temperatures than conventional forced convection-based air heat pumps.
Numerous publications describe the market potential of solar hybrid modules with di-rect evaporation (PVT-direct module), and several theoretical studies describe con-structive approaches and related calculations. However, to date, there is still no practi-cal implementation of a PVT hybrid module in combination with a module-integrated direct evaporation of the natural refrigerant CO2 in microchannels. So far, no experi-mental studies on CO2-PVT-based heat pump systems with direct evaporation have been carried out by research institutions. Thus, the proof of the constructive and func-tional feasibility of a CO2-based PVT-direct module as well as the energetic feasibility of the PVT-based CO2 heat pump system is still a desideratum.
The three objectives of this work can be summarized as follows:
1. Development and production of the PVT-direct module for the analysis of the constructional feasibility of the PVT-direct module
2. Experimental investigation of the PVT-direct module for the analysis of both the thermal and electrical functional feasibility of the PVT-direct module
3. Analysis of the energetic feasibility of the PVT-based CO2 heat pump system
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