A low-temperature heat storage system utilizing mixtures of magnesium salt hydrates and ammonium nitrate
The heat storage system based on mixtures of salt hydrates and anhydrous salts desjribed in previous articles has been applied to Mg(NO/sub 3/)/sub 2/.6H/sub 2/O and MgCI/sub 2/. 6H/sub 2/O (alone or in eutectic mixtures), added with NH/sub 4/NO/sub 3/. Calorimetric measurements showed that in the temperature range 25-60/sup 0/C, Mg(NO/sub 3/). 6H/sub 2/O allows a Thermal Energy Storage (TES) capacity of about 56 kcal/kg (equivalent to 86 kcal/liter), which is slightly lower than the values previously recorded with ammonium alum. When the maximum temperature was lowered to 55/sup 0/ and to 50/sup 0/C, in order to be closer to the peak-efficiency of commercial flat-plate collectors, the best results were obtained, respectively, with Mg(NO/sub 3/)/sub 2/ .6H/sub 2/O and with the eutectic mixture Mg(NO/sub 3/)/sub 2/. 6H/sub 2/O - MgCI/sub 2/. 6H/sub 2/O, both added with NH/sub 4/NO/sub 3/. The mixtures of the aforementioned magnesium salts and ammonium nitrate do not show any significant efficiency reduction after many thermal cycles, and at the present stage of the research, they may be considered the most suitable for obtaining heat storages in the temperature range of commercial solar collectors.
- Research Organization:
- Department of Organic and Biological Chemistry, Messina University, Messina
- OSTI ID:
- 5536263
- Journal Information:
- J. Sol. Energy Eng.; (United States), Vol. 107:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLAT PLATE COLLECTORS
SENSIBLE HEAT STORAGE
AMMONIUM NITRATES
CALORIMETRY
HYDRATES
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
THERMAL EFFICIENCY
ALKALINE EARTH METAL COMPOUNDS
AMMONIUM COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
EFFICIENCY
ENERGY STORAGE
EQUIPMENT
HALIDES
HALOGEN COMPOUNDS
HEAT STORAGE
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
SOLAR COLLECTORS
SOLAR EQUIPMENT
STORAGE
142000* - Solar Energy- Heat Storage- (1980-)
141000 - Solar Collectors & Concentrators