Hybrid System

In this study the performance of a residential demand controlled (DC) extract ventilation system with an air-to-water heat pump was analysed via dynamic simulations. A real life test case was setup to validate results. The ventilation system controls automatically the extract air in functional as well as habitable rooms, ensuring indoor air quality (IAQ). The total extract rate is mixed with outdoor air as heat source of the air-to-water heat pump (2.5 kW at standard reference conditions). Domestic hot water (DHW) as well as space heating (SH) can be alternatively supplied.

The present study deals with the feasibility of Flywheel Energy Storage Systems (FESS) in several RES-based stand-alone electricity production systems. Energy buffering is necessary in any RES-based off-grid system, however conventional energy storage systems (batteries, hydrogen etc.) suffer from limited equipment lifetime, high initial costs, and negative environmental impact during their operation as well as after their life-cycle.