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Extra resources for 22.Energy Conversion
B) Shunt excitation. (c) Series excitation. (d) Compound excitation.
The moments at which the compressors are started and stopped being thus clearly determined, idling is completely eliminated, leading to a valuable reduction in energy consumption. At the end of the first stage in the operation of the hydropneumatic accumulator, if the compressors are not stopped in time, there is a risk that the compressed air in the pneumochamber will pass into the hydrochamber through the hydraulic connection, where it can spray or push water out of the hydrochamber, causing unbalanced operation and possible severe damage to the surrounding mining workings.
It uses part of the energy lost to irreversibility (xl in Fig. 12) as kinetic energy during its flow. By a comprehensive assessment it is less polluting than other energy storage systems. It is safe in explosive atmospheres. In underground mine workings, when exhausted from pneumatic equipment, it cleans the atmosphere, and in an emergency (collapses, people trapped underground) the pneumatic network allows trapped staff to be supplied with air, water, and food. It allows a large number of accumulation–discharge cycles without diminishing rated capacity.