In this article, we tried to examine the energy of an object under different physical conditions. We demonstrated that the outcome is different from what physicists has so far believed. Basically, we showed that the net energy of an object in this universe is fixed and is not affected by the environment.

Keywords: Universe, Energy, Cosmology.

The purpose of this report was to compare the numerical analysis for different cooling efficiency of a cable tunnel system when installing one additional cable trough or three cable troughs for cable circuit 100% or 70% heat load. Cable tunnel system is widely known for it is use for high voltage transmission in an underground. Due to the cables generating large quantities of heat, water pipes and air ventilation were used in the tunnel to cool down the transmission cable. To investigate the cooling efficiency of a tunnel, research for benchmark case was carried out. A Computational Fluid Dynamic (CFD) benchmark analysis about 2D natural convection inside the square cavity was investigated to further understand the air movement inside the square medium....

Keywords: Cable tunnel system, natural convection, and Computational Fluid Dynamic.