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  • 1.
    Blackman, Corey
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Hallström, Olof
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Bales, Chris
    Högskolan Dalarna.
    Demonstration of Solar Heating andCooling System using Sorption Integrated Solar Thermal Collectors2014In: EuroSun 2014 Conference Proceedings, 2014, p. 523-532Conference paper (Refereed)
    Abstract [en]

    Producing cost-competitive small and medium-sized solar cooling systems is currently a significant challenge. Due to system complexity, extensive engineering, design and equipment costs; the installation costs of solar thermal cooling systems are prohibitively high. In efforts to overcome these limitations, a novel sorption heat pump module has been developed and directly integrated into a solar thermal collector. The module comprises a fully encapsulated sorption tube containing hygroscopic salt sorbent and water as a refrigerant, sealed under vacuum with no moving parts. A 5.6m2 aperture area outdoor laboratory-scale system of sorption module integrated solar collectors was installed in Stockholm, Sweden and evaluated under constant re-cooling and chilled fluid return temperatures in order to assess collector performance. Measured average solar cooling COP was 0.19 with average cooling powers between 120 and 200 Wm-2 collector aperture area. It was observed that average collector cooling power is constant at daily insolation levels above 3.6 kWhm-2 with the cooling energy produced being proportional to solar insolation. For full evaluation of an integrated sorption collector solar heating and cooling system, under the umbrella of a European Union project for technological innovation, a 180m2 large-scale demonstration system has been installed in Karlstad, Sweden. Results from the installation commissioned in summer 2014 with non-optimised control strategies showed average electrical COP of 10.6 and average cooling powers between 140 and 250 Wm-2 collector aperture area. Optimisation of control strategies, heat transfer fluid flows through the collectors and electrical COP will be carried out in autumn

     

  • 2.
    Hallstrom, Olof
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Fueldner, Gerrit
    Fraunhofer Inst Solare Energiesyst ISE, Freiburg, Germany.
    Integration of sorption modules in Sydney type vacuum tube collector with air as heat transfer fluid2015In: INTERNATIONAL CONFERENCE ON SOLAR HEATING AND COOLING FOR BUILDINGS AND INDUSTRY, SHC 2014, 2015, Vol. 70, p. 445-453Conference paper (Refereed)
    Abstract [en]

    Reduced thermal losses and simplified system integration have previously been identified as main opportunities to improve the concept of collector integrated sorption modules for solar heating and cooling. A concept for a facade integrated sorption collector using Sydney type vacuum tube technology and air based heat transfer has been developed and tested in the laboratory. The results from the tests have been used to validate an existing TRNSYS model that has been modified for use with air as heat transfer fluid. The work has been conducted within the FP7 EU iNSPiRe project with the aim to develop a plug & play solar cooling and heating solution. (C) 2015 The Authors. Published by Elsevier Ltd.

  • 3.
    Hallström, Olof
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Design Optimization of a Sorption Integrated Sydney Type Vacuum Tube Collector2017In: Journal of solar energy engineering, ISSN 0199-6231, E-ISSN 1528-8986, Vol. 139, no 2, article id 021007Article in journal (Refereed)
    Abstract [en]

    In order to reach the targets on emissions set by the European Commission, both new and existing buildings must reduce their fossil fuel inputs. Solar thermal cooling supplying on-site renewable heating and cooling could potentially contribute toward this goal. In this paper, a novel concept for solar thermal cooling providing efficient coproduction of cooling and heating based on sorption integrated vacuum tube collectors is proposed. A prototype collector has been constructed and tested in a solar laboratory based on a method developed specifically for sorption integrated collectors. From the test results, the key performance parameters have been determined and used to calibrate a mathematical model for trnsys environment. System simulation has been conducted to optimize the collector and sorption module configuration by performing a parametric study where different vacuum tube center-center (C-C) distances and sorption module designs are tested for a generic hotel in Ankara, Turkey. The parametric study showed that the heating and cooling output per year can be as high as 1000 kWh/m2 for solar fractions above 50%, and that the output per sorption module compared to the prototype can more than double with an optimized design. Furthermore, cooling conversion efficiencies defined as total cooling output per total solar insolation can be as high as 26% while simultaneously converting 35-40% of the incident solar energy into useful hot water.

  • 4.
    Hallström, Olof
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Füldner, G.
    Fraunhofer-Institut für Solare Energiesysteme ISE, Germany.
    Spahn, H. -J
    Vaillant GmbH, Germany.
    Schnabel, L.
    Fraunhofer-Institut für Solare Energiesysteme ISE, Germany.
    Salg, F.
    Vaillant GmbH, Germany.
    Development of collector integrated sorption modules for solar heating and cooling: Performance simulation2014In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 48, p. 67-76Article in journal (Refereed)
    Abstract [en]

    Solar thermal cooling has difficulty to emerge as an economically competitive solution for small systems mainly due to high investment cost and system complexity [1]. Therefore developments of principally new system solutions are needed. This paper describes such a solution with sorption modules directly integrated into a solar thermal collector. The focus of the work has been to find key parameters influencing the module and the system efficiency. A validated model of a sorption collector has been implemented into a simplified system deck providing cooling, heating and domestic hot water to static loads in the system modelling environment TRNSYS [2]. Simulations have been conducted for different boundary conditions and at two locations with different climatic conditions. Thermal losses from the collector as well as internal thermal losses inside the collector were found to be the most important parameters influencing efficiency. The system simulations gave overall thermal cooling efficiencies in the range of 0.12-0.27 and electrical cooling efficiencies in the range of 15-45 depending on collector technology, climate and control strategy.

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