A residential solar-heating-and-cooling (SHC) system is a possible alternative for the reduction of fossil fuel consumption to cover residential energy loads. These systems can cover all thermal loads, i.e. space heating, space cooling and domestic hot water preparation. Space cooling is fulfilled through a heat-activated (hot water), single-effect LiBr-water absorption chiller. Proper operation of such a system requires coupling of the solar collector array to a hot water storage tank with auxiliary heating. Auxiliary heating, in this case in the form of a diesel-fired boiler, is necessary to supplement heating in the storage tank when demand exceeds solar heating availability. In this study emphasis is given on the effect of the collector tilt angle (slope) on the performance of a SHC system. A constant slope throughout the year simplifies system configuration and maintenance, but on the other hand a variable slope improves performance, in terms of energy efficiency, and thereby lowers the operating cost of auxiliary heating. The results of the study show that it is economically beneficial to vary the slope throughout the year (on a monthly basis), since $233/year can be saved when a variable slope is used.
Calise F, Dentice d’Accadia M, Palombo A. Transient analysis and energy optimization of solar heating and cooling systems in various configurations. Solar Energy 2010; 84: 432-49. http://dx.doi.org/10.1016/j.solener.2010.01.001
Florides G, Kalogirou S, Tassou S, Wrobel L. Modelling and simulation of an absorption solar cooling system for Cyprus. Solar Energy 2002; 72: 43-51. http://dx.doi.org/10.1016/S0038-092X(01)00081-0
Ali AHH, Noeres P, Pollerberg C. Performance assessment of an integrated free cooling and solar powered single-effect lithium bromide-water absorption chiller. Solar Energy 2008; 82: 1021-30. http://dx.doi.org/10.1016/j.solener.2008.04.011
Koroneos C, Nanaki E, Xydis G. Solar air conditioning systems and their applicability-An exergy approach. Resources Conservation and Recycling 2010; 55: 74-82. http://dx.doi.org/10.1016/j.resconrec.2010.07.005
Kalogirou SA. Solar Energy Engineering: Processes and Systems. 2nd ed Oxford UK: Academic Press 2014.
Duffie JA, Beckman WA. Solar Engineering of Thermal Processes. 4th ed Hoboken NJ USA: Wiley 2013. Figure 6: Collector slope (fixed and variable) vs. total annualized cost of SHC system and annual cost for auxiliary heating.
Arsalis A. Modeling and simulation of a 100 kWe HT-PEMFC subsystem integrated with an absorption chiller subsystem. International Journal of Hydrogen Energy 2012; 37: 13484- 90. http://dx.doi.org/10.1016/j.ijhydene.2012.06.106
Herold KE, Radermacher R, Klein SA. Absorption chillers and heat pumps. Boca Raton FL USA: CRC Press 1996.
Calise F, Palombo A, Vanoli L. Maximization of primary energy savings of solar heating and cooling systems by transient simulations and computer design of experiments. Applied Energy 2010; 87: 524-40. http://dx.doi.org/10.1016/j.apenergy.2009.08.033
Deng J, Wang RZ, Han GY. A review of thermally activated cooling technologies for combined cooling, heating and power systems. Progress in Energy and Combustion Science 2011; 37: 172-203. http://dx.doi.org/10.1016/j.pecs.2010.05.003
Tsilingiris PT. Theoretical modelling of a solar air conditioning system for domestic applications. Energy Conversion and Management 1993; 34: 523-31. http://dx.doi.org/10.1016/0196-8904(93)90143-X
Ministry of Energy CI and T. Competition and consumer protection service. Prices of petroleum products. URL: www.mcit.gov.cy/mcit/mcit.nsf/dmloilnew_gr/dmloilnew_gr?O penDocument 2014.
Eurostat. Energy price statistics. URL: epp.eurostat.ec.europa.eu/statistics_explained/index.php/En ergy_ price_statistics#Further_Eurostat_information 2013.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.