The Experts below are selected from a list of 1773 Experts worldwide ranked by ideXlab platform
Maidment G. - One of the best experts on this subject based on the ideXlab platform.
-
Combined benefits of cooling with heat recovery for electrical Cable Tunnels in cities
'Elsevier BV', 2021Co-Authors: Wegner M., Turnell H., Davies G., Revesz A., Maidment G.Abstract:Electrical power in cities is typically distributed by means of underground Cable Tunnels. The Cables generate significant heat, and Tunnel temperature is generally controlled via ventilation shafts with circulation to prevent overheating. If active cooling of the inlet air is provided, then temperatures can be lowered and electrical distribution losses reduced. This novel study, the first looking at Cable Tunnels with District Heating, investigates the effect and impact of heat recovery. The work combines technical and economic modelling together with measured data from a case study and shows significant benefits with wide-scale replication potential. A finite element (FE) model, for heat dissipation in a section of Cable Tunnel together with a spreadsheet model has shown that up to 460 kW of heat can be delivered to the local heating network for a single cooling point. The study indicates savings of 570 kg CO2e and 4000 kWh (of combined heat and electrical energy) per metre of Tunnel per annum with reduced operating costs. Given the widespread network of Cable and other Tunnels in major cities, close to numerous heat users, the application of these techniques has major financial and low-carbon benefits for the UK and globally
Samchenko Taras - One of the best experts on this subject based on the ideXlab platform.
-
Investigation of the regularities of temperature regime of fire in Cable Tunnels depending on its parameters
'EDP Sciences', 2018Co-Authors: Nuianzin Oleksandr, Kryshtal Mykola, Nesterenko Artem, Kryshtal Dmytro, Samchenko TarasAbstract:Simulation, as a method of scientific research, makes it possible, without performing costly and labor-intensive field experiments on models, to carry out all necessary experiments to determine the temperature modes of fire in Cable Tunnels. The purpose of the research of this work was to determine the temperature regime of fire in a Cable Tunnel depending on its shape, size and fire load. Mathematical models of Cable Tunnels were created in one of the CFD software systems. Cable products are constantly evolving and improving. For tests on the fire resistance of building structures of Cable Tunnels, a standard temperature mode of fire is used which may not correspond to fire mode in a real Cable Tunnel. The computational experiments were carried out and the temperature regimes of fires in Tunnels with different parameters were determined. The obtained results showed the parameters of Cable Tunnels, which influence the temperature regime of fire in Tunnels most. In this paper the use of computational experiments for the study of heat and mass transfer processes in fires in Cable Tunnels was examined further. CFD Fire Dynamics Simulator 6.2 was used
Wegner M. - One of the best experts on this subject based on the ideXlab platform.
-
Combined benefits of cooling with heat recovery for electrical Cable Tunnels in cities
'Elsevier BV', 2021Co-Authors: Wegner M., Turnell H., Davies G., Revesz A., Maidment G.Abstract:Electrical power in cities is typically distributed by means of underground Cable Tunnels. The Cables generate significant heat, and Tunnel temperature is generally controlled via ventilation shafts with circulation to prevent overheating. If active cooling of the inlet air is provided, then temperatures can be lowered and electrical distribution losses reduced. This novel study, the first looking at Cable Tunnels with District Heating, investigates the effect and impact of heat recovery. The work combines technical and economic modelling together with measured data from a case study and shows significant benefits with wide-scale replication potential. A finite element (FE) model, for heat dissipation in a section of Cable Tunnel together with a spreadsheet model has shown that up to 460 kW of heat can be delivered to the local heating network for a single cooling point. The study indicates savings of 570 kg CO2e and 4000 kWh (of combined heat and electrical energy) per metre of Tunnel per annum with reduced operating costs. Given the widespread network of Cable and other Tunnels in major cities, close to numerous heat users, the application of these techniques has major financial and low-carbon benefits for the UK and globally
Nuianzin Oleksandr - One of the best experts on this subject based on the ideXlab platform.
-
Investigation of the regularities of temperature regime of fire in Cable Tunnels depending on its parameters
'EDP Sciences', 2018Co-Authors: Nuianzin Oleksandr, Kryshtal Mykola, Nesterenko Artem, Kryshtal Dmytro, Samchenko TarasAbstract:Simulation, as a method of scientific research, makes it possible, without performing costly and labor-intensive field experiments on models, to carry out all necessary experiments to determine the temperature modes of fire in Cable Tunnels. The purpose of the research of this work was to determine the temperature regime of fire in a Cable Tunnel depending on its shape, size and fire load. Mathematical models of Cable Tunnels were created in one of the CFD software systems. Cable products are constantly evolving and improving. For tests on the fire resistance of building structures of Cable Tunnels, a standard temperature mode of fire is used which may not correspond to fire mode in a real Cable Tunnel. The computational experiments were carried out and the temperature regimes of fires in Tunnels with different parameters were determined. The obtained results showed the parameters of Cable Tunnels, which influence the temperature regime of fire in Tunnels most. In this paper the use of computational experiments for the study of heat and mass transfer processes in fires in Cable Tunnels was examined further. CFD Fire Dynamics Simulator 6.2 was used
Lim, Shin Fong - One of the best experts on this subject based on the ideXlab platform.
-
Heat transfer analysis of underground Maju Cable Tunnel / Lim Shin Fong
2018Co-Authors: Lim, Shin FongAbstract:This study emphasized on utilizing numerical method to determine the best ventilation method and best air flow rate for Underground Maju Cable Tunnel ventilation system. The purpose of this mechanical ventilation system is to remove the heat produce by the high tension Cables in this unmanned Cable Tunnel and same time maintain the Cable Tunnel internal temperature below 40° to ensure a steady state operation condition. In this 163m long, 3m width and 2.4m height rectangular Cable Tunnel, there are 4 circuits of XLPE 132KV 3x1C 1000mm2 (copper conductor) mounted in this Cable Tunnel and each circuit were installed in trefoil configuration. By analytical calculation, the surface temperature of the XLPE Cable is approximately 56.25°C. However, surface temperature of 60°C to be applied in the simulations in order to simulate the worst case scenario. CFD software - ANSIS fluent was used for simulations and it was preset to simulate in Steady State Condition. Simulations were conducted in two types of conventional ventilation method which are Longitudinal Ventilation and Semi Transverse Ventilation. Two different air change rate, 10 Air change per hour (ACH) and 20 ACH have been applied to simulate with two different ambient temperature, 33.63°C (which is average ambient temperature in Klang Valley) and 37.00°C (10% above average ambient temperature). The purpose of simulating in a 10% above average ambient temperature is to ensure the design air flow rate could maintain the Tunnel internal temperature even if global temperature rise in future. In total, 8 scenarios have been simulated. From the analysis results, it can be conclude that the most suitable ventilation method is Longitudinal Ventilation for such length Cable Tunnel. The most suggested inlet air velocity is 0.9055m/s (20ACH) with the air flow of 23470.56 CMH. With this setup, the internal ambient air temperature below 40°C can be achieved. At this temperature, the heat generated by high voltage Cables can be dissipated efficiently and maintain in a high performance current carrying capacity
