Evaluation of a solar cooling system with louvre thermal collectors

International Journal of Low-Carbon Technologies, Apr 2007

This work aims to evaluate the integration of solar louvre collectors into a cooling system using a water-fired absorption chiller. Simulations for a building were performed using the TRNSYS simulation program, varying collector areas and using Portuguese climatic conditions. The system performance was assessed and the results show that with such a system, comfortable indoor thermal conditions can be guaranteed. The system may also lead to energy savings when compared with conventional cooling.

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Evaluation of a solar cooling system with louvre thermal collectors

International Journal of Low Carbon Technologies 2/2 Evaluation of a solar cooling system with louvre thermal collectors Ana I. Palmero-Marrero 0 Armando C. Oliveira (corresponding author) 0 0 Faculty of Engineering, University of Porto, Dept. Mechanical Engineering and Industrial Management , Rua Dr. Roberto Frias, 4200-465 Porto , Portugal This work aims to evaluate the integration of solar louvre collectors into a cooling system using a water-fired absorption chiller. Simulations for a building were performed using the TRNSYS simulation program, varying collector areas and using Portuguese climatic conditions. The system performance was assessed and the results show that with such a system, comfortable indoor thermal conditions can be guaranteed. The system may also lead to energy savings when compared with conventional cooling. Roman letters A area [m2] COP chiller coefficient of performance [−] f solar fraction [−] F collector heat removal factor [−] (based on collector average fluid temperature) H height [m] l, L length [m] Q monthly thermal energy [J, kWh] T temperature [°C] UL collector heat loss coefficient [W/m2/K] Greek letters h efficiency [−] (ta)n collector transmittance - absorptance product for normal incidence [−] c louvre inclination angle [°] solar collectors; louvres; absorption cooling; building simulation; TRNSYS Nomenclature Subscripts air indoor air amb ambient air (external) aux auxiliary cool cooling col collector (louvre) e collector edge to façade hw hot water inc incident Introduction solar useful window transparent plastic louvre insert SOLAR RADIATION copper louvre insert (water channel) louvre insulation aluminium frame solar louvres windows in south façade solar louvre collectors χ Le = 1.11 m Lw = 1.5 m H = 0.87 m lcol = 0.25 m S Le H Hw Modelling of system components Simulation results without shad. with shad. with shad. + chiller Acol =12.5 m2 without shad. with shad. with shad. + chiller Acol = 25 m2 with shad. Tamb with shad. + chiller Hours Qhw Qcool Qaux Qsoll usef Acol = 12.5 m2 Months Figure 9. COP = Qcool Qhw f = Qsol usef = 1 − Qaux Qhw Qhw hsol = Qcool Qsol inc Qcool (MJ) Qcoo (MJ) Qaux = (1 − f ) ⋅ Qhw = Qcool Acol Qcool Celect.(€/year) (at 0.115 €/kWh) Cnat.gas.(€/year) (at 0.0717 €/kWh) savings (€/year) Acknowledgment [1] S. B. Riffat , ' Solar Louvre Building Integrated Collector. Final Technical Report to the European Commission' , contract ENK6 - CT2000 -00330, ( 2003 ). [2] A. I. Palmero-Marrero and A. C. Oliveira , 'Evaluation of a Solar Thermal System Using Building Louvre Shading Devices', Solar Energy , 80 ( 5 ) ( 2006 ), 545 - 554 . [3] A. I. Palmero-Marrero and A. C. Oliveira , ' Testing of an Integrated Solar Louvre Collector', International Journal of Ambient Energy , 25 ( 4 ) ( 2004 ), 171 - 176 . [4] M. Safarik , L. Richter and M. Otto , Solar Powered H2O/LiBr Absorption Chiller with Low Capacity' , Proceedings HPC ' 04 (Heat Powered Cycles) Conference, London South Bank Univ., Cyprus, 2004 . [5] A. A. Argiriou , C. A. Balaras , S. Kontoyiannidis and E. Michel , ' Numerical Simulation and Performance Assessment of a Low Capacity Solar Assisted Absorption Heat Pump Coupled with a SubFloor System' , Solar Energy, 79 ( 3 ) ( 2005 ), 290 - 301 . [6] Solar Energy Laboratory , ' TRNSYS 16: A Transient System Simulation Program - Program Manual' , ( 2004 ), University of Wisconsin-Madison, USA. [7] Meteotest , 2003 . Meteonorm Handbook, Parts I, II and III . Bern, Switzerland. (http://www. meteotest.ch) [8] ISO-7730, 'Moderate thermal environments. Determination of the PMV and PPD indices and specification of the conditions for thermal comfort' , International Standards Organisation, ( 1994 ). (...truncated)


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Ana I. Palmero-Marrero, Armando C. Oliveira. Evaluation of a solar cooling system with louvre thermal collectors, International Journal of Low-Carbon Technologies, 2007, pp. 99-108, 2/2, DOI: 10.1093/ijlct/2.2.99