fundamentals of engineering thermodynamics pdf 8e

The relevant laws are extended to other energy links, the concepts of exergy-voltage of electric and gas distribution networks are proposed, and the exergy flow model is established. Next, the concept of exergy-voltage is proposed based on exergy-potential difference, and the exergy flow calculation model of the equivalent region heat network is established. Taking the return network as the reference system, the exergy flow model of a single-layer regional heat network is established, and the equivalence rationality of the regional heat network is verified by the exergy flow balance analysis. Firstly, the exergy flow distribution mechanism of the regional heat network is analysed. Based on the multi-energy flow, this paper analyses the exergy flow distribution mechanism of the network, and puts forward a unified calculation model of the exergy flow of RIES. It has been estimated that 0.38 MJ is needed for the size reduction of 1 m³ of ejected mass.Ī regional integrated energy system (RIES) involves many different forms of energy, which can use exergy as a measure of energy quality. This paper has focused on the estimation of the energy required to disintegrate the rock.

The work produced enables first the disintegration of the rock, and then its transportation along the mine working space. The quantity of energy depends on the type of transformation taking place during decompression. This paper presents a condensed energy balance for the phenomenon of outbursts of dolomites and gases. Gas-induced geodynamic events are dependent on the co-occurrence of two factors: rock porosity, and the presence of gas under significant pressure in the pores and crevices of the rock. In the last time, two outbursts of gas and dolomite have occurred in the Legnica-Głogów Copper Region in southwestern Poland, which is one of the world’s largest copper ore mining regions.

Gas-induced geodynamic events in dolomite are a new and unexplored phenomenon. Rock and gas outbursts occur most frequently in coal mining.

Fundamentals of engineering thermodynamics pdf 8e