Low-frequency high-voltage alternating-current (LF-HVac) transmission scheme has been recently proposed as an alternative solution to conventional 50/60-Hz HVac and direct-current (HVdc) schemes for bulk power transfer. This paper proposes optimal planning operation loss minimization in a multi-frequency system. In such system, LF-HVac grids are interconnected using back-to-back (BTB) converter...

The building sector accounts for a substantial amount of energy consumption, resulting in higher carbon emissions and environmental impact worldwide. Electrification efficiency systems can be the key to decarbonization buildings. This research proposes new heating cooling loops consisting heat pumps lower natural gas usage systems. Typical chillers boilers are replaced with serve loads maintain...

An energy flow model of an airport terminal’s HVAC system is established in this paper. Based on energy flow model, the exergy efficiency, exergy loss and exergy cost distribution ratio of each component are calculated and analyzed by the energy flow model. Optimization method and exergy balance equations are used to calculate the lowest exergy loss of HVAC system under different operation cond...