Publikationen / Ergebnisse
(Französisch)
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Dans le cadre de la Tâche 38 de l'Agence Internationale de l'Energie (AIE), nous avons effectué durant l’année 2008 les points suivants :
- Installation du stand de tests de la machine Sortech
- Mise en place du programme d'acquisition et de gestion du stand de tests permettant de faire fonctionner le système de manière reproductible, ceci grâce à l’intégration de simulations TRNSYS dans la boucle de commande et d’acquisition.
- Initier l’analyse du cycle de vie de tous les composants du stand de tests
- Participation aux séances de la Tâche 38 de l’AIE.
Auftragnehmer/Contractant/Contraente/Contractor:
Autorschaft/Auteurs/Autori/Authors:
Citherlet,S.
Hildbrand,Catherine
Kleijer,A.
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Schlussbericht
(Englisch)
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The investigation of the performance and the potential of adsorption solar air-conditioning within Switzerland was conducted by the Laboratory of Solar Energetics and Building Physics of the HEIG-VD. This project, funded by the Swiss Federal Office of Energy, was run parallel to Task 38 of the International Agency of Energy (IEA) entitled “Solar Air-Conditioning and Refrigeration”. The mandate is summarised as follows:
- Development and commissioning of a test bench to assess a solar cooling sorption machine. This test bench differs from others as it is able to emulate the major components of the facility, namely the building, the solar collectors and the cooling system. It includes a full program of acquisition and management for operating the system in a reproducible manner, thanks to the integration of TRNSYS simulations in the acquisition and control loops.
- Performance analysis of a commercial system from Sortech, under stable conditions. Parametric studies of the machine under different configurations (collector type, control, etc.)
- Validation of a simulation model which includes the TRNSYS model of Sortech.
- Specification of a reference installation comprising Sortech for cooling during summer and a boiler to ensure DHW and space heating.
- Comparison of the reference installation with others systems capable of producing cooling and heating under two different climates (Zürich and Barcelona). The other systems are: compression unit with gas boiler; reversible “air/water” HP and reversible HP with boreholes. Theses comparisons were based on three criteria:
- Energy consumption analysis taking into account the energy for space heating in winter, air-conditioning in summer and DHW throughout the year.
- Environmental impact assessment (ecobalance) of the installations including materials and energy consumed during the facilities life cycle.
- Financial analysis taking into account investment costs, annuities, operating costs and the increase of energy prices.
The investigations performed during this project have shown the current limits of the adsorption solar cooling system. It appears from the study that this type of installation in a climate, such as that of Switzerland, characterized by a relatively low demand for cooling, is not currently financially justified, even if from the point of view of primary energy, this solution is comparable with the HP solutions. Indeed, the investment costs of such a facility are far too high in comparison to the energy gains that could be achieved through the energy savings associated with the installation of solar collectors. However, this situation is different for Mediterranean countries where this type of system could be adequate.
Nevertheless, in terms of environmental impacts, particularly primary energy and greenhouse gas emissions, the solar air-conditioning with a gas backup system was shown to be comparable to the reversible HP solutions and is probably more interesting if a pellet backup system is employed.
Auftragnehmer/Contractant/Contraente/Contractor:
Autorschaft/Auteurs/Autori/Authors:
Citherlet,S.
Hildbrand,Catherine
Bony,J.
Kleijer,A.
Bunea,Mircea
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