Performance Evaluation of Elimination of Stagnation of Solar Thermal Systems

Abstract

The study deals with the possibility of elimination of stagnation of thermal systems. The state of stagnation of thermal systems leads to overheating and evaporation of the heat transfer medium, which increases pressure and can lead to damage to the solar thermal system. Stagnation can occur due to a fault and stopping of the circulation pump, which causes the circulation of the heat transfer medium to stop. Another possibility is to achieve thermal saturation in the system, which can be affected by low heat consumption from the system. Elimination of stagnation is possible by various construction designs of collectors or by using other technical means. This study describes an experiment verifying the usability of a thermal collector’s tilting system to eliminate thermal stagnation of the system. The system is fully automatic, and when recording the limit values, ensures that the panel is rotated out of the ideal position, thus reducing the amount of received energy. In this way, the temperature of the medium in the system can be reduced by up to 10% in one hour. In the case of thermal saturation of the system, the solution is the automatic circulation of heat-transfer fluid through the system during the night and the release of thermal energy to the outside. These results suggest that the methods used actively eliminate stagnation of thermal systems.

The Description of “Temperature Self-Limiting” in Jordanian Solar Generators with Natural Cooling

“…To subtract inactiveness, an air array piping was used. An air-cooling unit was set under the collector to reduce the Inactiveness [8][9][10][11][12][13]. -5 represent the prototype reg generator pilot design that has been set up at the University of Mutah's department of the manufacturing facility, additionally the flap taps arrangement, which was also utilized to expand the reservoir in helping to fulfill it with liquids from the supply and discharge lines.…”

“…Several methods were tested and applied to control inactiveness in the experiential reg system; the appropriate solution must be simple to execute, inexpensive, and run continuously without any technical issues [13][14][15][16][17][18][19][20][21].…”

“…the relevant thermal parameters: temperature, compress pressure, and Solar acuteness were documented and reported. Underneath the absorber layer, an air pipe was fixed [12][13].…”

“…The thermal shock could reveal the entry solution on hot days, causing turbulence, vibrating, and destroying the power piping arrangement. Managing and controlling inactiveness encompasses all measures that can be applied to stop the emergence of a no-flow event [13][14][15][16][17][18][19][20][21][22][23][24]. Inactiveness is a common issue with solar systems worldwide, particularly in hot, dry areas, and it is an outcome of poor system design or cost-cutting by a manufacturer.…”

Special Issue on “Thermal Safety of Chemical Processes”

“…Rimmar et al [9] evaluated the performance of the stagnation elimination of solar thermal systems. Such stagnation increases thermal risk leading to the overheating and evaporation of the heat transfer medium.…”