Gaining ground across the globe - Kloben

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globe District heating system for 54 individual homes: EnerWorks added collectors to the solar powered subdivision in the town of Okotoks in the province of Alberta. Photo: EnerWorks The collectors of an entire solar powered subdivision shimmer in blue violet as the sun rises in the small town of Okotoks, Canada. The Canadian company EnerWorks constructed a solar district heating system for 54 individual homes here towards the end of 2007. The residents are provided with heat energy from the 2,300 m 2 of solar collectors installed in this system. Some homeowners have even installed small rooftop systems to meet their water heating needs. SUN & WIND ENERGY surveyed solar thermal companies around the world regarding their experiences with largescale solar thermal systems. In the survey we made a distinction between systems that have 50 to 500 m 2 of solar col lectors and systems with over 500 m 2 of collectors. The EnerWorks system is in the smaller segment of solar district heating systems. Of the 35 companies who participated in the survey, only three have implemented systems with more than 500 m 2 of solar collectors. The two other district heating networks were built in Germany with the help of federal funding. The Austrian company Tisun GmbH supplied collectors for a solar powered community in Munich, which also includes a seasonal storage tank with a capacity of 5,700 m 3 . In the third project, solar collectors were supplied by the German company Wagner & Co. and are now used to provide solar heat to a school, a sports hall and an indoor swimming pool in the southern German community of EggensteinLeopoldshafen. In contrast to the two other systems, which involved the construction of new buildings, this solar heating system replaced the heating systems found in old buildings from the 1960s that were specifically renovated for energy efficiency. Solar thermal systems that have more than 500 m 2 of collectors are relatively few and far between. Only about half of the companies surveyed have implemented systems of that size, most of them between 10 and 50. Only three companies have completed more than 100 projects: The Chinese company Jiangsu Sunrain Solar Energy Co., Ltd., indicated that it has implemented around 9,000 of these projects and therefore has the most experience with largescale systems. Following far behind are the Turkish company Ezinç Metal A.S. and the Indian company Emmvee Solar, which have installed about 320 and 200 of these systems, respectively. Hotel projects dominate When asked about what types of systems they install, most of the companies (13) mentioned hotel systems. An extremely large system with more than 1,500 m 2 of solar collectors was recently built in Cuba by the Israeli company Chromagen Solar Energy Solutions. The hotel La Estrella has 1,308 beds distributed over 38 buildings. “La Estrella is one of the most prestigious hotels in the Caribbean region”, says International Sales Manager Dorit Cohen. A storage tank with a capacity of more than 120,000 litres ensures that the hotel guests have access to hot water whenever they need it, especially in the evening and morning hours. Sun & Wind Energy 5/2009 67
Solar thermal large-Scale inStallationS Solar powered community in Munich: collectors covering 3,000 m 2 of surface area are configured to transfer solar heat into a seasonal storage tank. Photo: Tisun 68 Nine companies have installed systems that are specifically designed for multifamily homes and comprise more than 500 m 2 of solar collectors. Eight companies have outfitted various hospitals and nursing homes with solar collectors. Systems that supply solar process heat for commercial and industrial projects were cited just as often in the survey. “Some of our largest projects are for industrial use”, explains Chaitanya Yardi, Marketing Director of the Indian company NRG Technologists Pvt Ltd. Some of the systems (up to 25,000 litre systems) are designed to preheat boiler feed water. Other uses: a few hightemperature systems (85 °C) for washing medication bottle caps (20,000 litre system), several systems for dyeing textiles (85 °C, up to 15,000 litres) and others for heating the chemicals used to manufacture bright bars (up to 10,000 litres) and for the hot phosphating process used by powder coating equipment (usually 85 °C, up to 10,000 litres). The 8/2009 edition of SUN & WIND ENERGY will focus on the subject of solar process heat. Roof-integrated system for a sports centre Also cited frequently: six companies indicated that they have outfitted sports facilities with solar collectors as well. The Swiss company Energie Solaire SA, The vacuum tubes of this hotel system in Salerno, Italy, were divided into eleven parallel-connected subarrays by Kloben. The system supplies thermal heat and hot water and is also used for solar cooling. Photo: Kloben Sun & Wind Energy 5/2009
Page 1: Solar thermal large-Scale inStallat
Page 6 and 7: Type of solar system Kind of system
Page 8 and 9: Collector area [m 2 ] Hotel systems
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Page 15 and 16: Solar thermal 80 AllSun A/S unifyin
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Gaining ground across the globe - Kloben

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