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The electricity production decreases with respect to increase of the temperature of the PV module. To eliminate this problem, PV module is incorporated with thermal collector to allow PV cooling. It is found that PV cooilng increases the electricity production and the extra heat to be absorbed by the coolant extracting thermal output. This system is called hybrid PT/Thermal system where water and...
The ever increasing demand for energy and rapid raise in global pollution levels has driven the energy generating sectors towards the search for more sustainable and eco-friendly methods to generate it. Solar energy is the best potential candidate to drive the global energy demand as well as to curb the pollution levels in earth. The photo voltaic and solar thermal systems are the widely developed...
Gas turbines play an important role in supplying power for the country especially in peak electricity load. The main disadvantages are the turbines, they produce large changes are a result of climate change. However, in times of peak electricity grid and at the same time warm months, can produce gas turbines under the effect of ambient temperature, the amount of reduced considerably. The methods adopted...
The sensitivity of solar photovoltaic panel towards temperature and relative humidity is investigated. The obtained result shows that increase in temperature and low humidity has the great effect on decreasing PV conversion efficiency. It was estimated that panel's temperature augmentation and low relative humidity caused the efficiency to decrease by 10–12%. This limitation makes solar PV an unreliable...
This paper investigates, experimentally, the temperature dependence of performance of the solar panel. The panel performance is determined by short circuit current (Isc), open circuit voltage (Voc), fill factor (FF) and efficiency (□). The voltage and current characteristics of photovoltaic system is highly influenced by temperature. In order to increase the degree of electrical conversion to diminish...
In order to solve the cooling problem of component in the electric and electronic equipment under special situation, this article discusses detail the application of the evaporative cooling technology in a set of convertor equipment, and gives the performance principle, implement method and experiment data. By debugging and running on spot, it shows that the cooling efficiency of the whole equipment...
The experimental research on the plans of solid-filled type and Liquid-filled type mixed medium of a 100 kVA evaporative cooling transformer is done, and test results are compared and analyzed. It is proved that evaporative cooling transformer using mixed medium can not only reduce the cost of transformer, but also improve its economy on the premise of keeping good cooling effect.
Ultracold Fermi-Fermi mixtures offer intriguing possibilities to study fermionic pairing phenomena and superfluidity in new regimes beyond the currently employed spin mixtures of a single species. We produce a doubly-degenerate mixture of 6Li and 40K atoms by evaporative cooling in an optical dipole trap. The trapping light is provided by a 100-W fiber laser operating near a wavelength of 1070nm.
Spray cooling with high-speed airflow down the bore of an electromagnetic (EM) railgun has the potential for effective cooling, while the airflow limits the amount of water present in the bore at the end of the cooling period. An experimental study was conducted to measure the convective heat transfer coefficient under the proposed conditions at a representative scale. A transient experiment was conducted...
In order to make sure that the evaporative cooling method has the same cooling effect with the inner water cooling, in this paper, we compared this two cooling modes through analysis method and numerical calculation method respectively. The results show the evaporative cooling has almost the same cooling effect with the inner water cooling method. At the same time, the evaporative cooling system has...
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