Abstract
The present study concerns the development of a micro-CAES system for thermal and electrical energy storage for residential and non-residential users (shelter/remote users including), in order to reduce energy costs and increase the reliability of energy supply from renewable sources. The micro-CAES system allows you to store the electricity generated from renewable and conventional sources to pressure energy. Further thermal energy can be recovered from conversion process, stored and used for space heating or hot water. The micro-CAES allows you to reduce peak energy demand by utilities (peak shaving), decrease the size of the power generation devices (downsizing), reduce the power of the contract with the grid operator, size the system on the load curve power users in order to increase energy efficiency and economic sustainability reducing management costs with the advantage to reduce operating costs, use of non-toxic materials, zeroing of GHG emissions (zero emission). The innovative technology is based on high-efficiency energy storage process via storage of compressed air at high pressure, quasi-isothermal compression of a mixture air-liquid for heat storage and supply of electrical power constant during the expansion. The air-liquid mixture with excellent ratio between the phases allows you to obtain quasi-isothermal compression, with maximum compression efficiency and high thermal exchange, it enables to have a constant electrical power during the expansion, at a constant pressure during discharge. A dedicated software enables to manage the micro-CAES system to adapt its operation as a function of external conditions and user requirements. An energetic and economic analysis has been performed identifying the optimal size reference. The power supply system provides for the integration of small wind and photovoltaic with a storage system based on micro-CAES. The technological challenge is to be able to ensure a constant power level selected throughout the day.
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