Study Of Heat Transfer Performance In Hydropower Dam Tunnel Based On Ventilation Network Analysis

China's underground hydropower station construction in terms of quantity and size were first in the world, mainly in the Yangtze River and Yellow River water system. Increasing energy shortage today, the use of soil, rock, the tunnel in Hydropower Dam as a natural cold and heat source is good energy-saving and environmental significance. JINGHONG Hydropower Dam filling with drainage, observation, inspection and traffic tunnel in different elevation. The tunnels in different elevation connect with specially designed ventilation shaft, forming a huge channel network. This provide good conditions for rational use of dam tunnel ventilation in upstream workshop. Thus subject to a wide range of concerns.A great deal of research for the effect of heat transfer in right straight underground tunnel at home and abroad. However, the tunnel in Hydropower Dam is complex. To the JINGHONG Hydropower Project as an example, it fill with drainage, observation, inspection and traffic tunnel in different elevation. The tunnels in different elevation connect with specially designed ventilation shaft. The result is that the tunnel ventilation heat transfer interaction. Predecessors of different angles of study, the literature of both methods with their respective advantages, but there are also some limitations. The literature [1] is calculated by the average major tunnel air volume and the average length of the tunnel to calculate tunnel ventilation temperature drop, This method does not take into tunnel structure, and impossible to determine the temperature distribution of air in tunnel. As the dam tunnel complex and large in size, the computer CPU and memory capacity requirements are very high for the use of numerical simulation (CFD). Study the flow temperature drop and distribution in tunnels of a dam based on the ventilation network theory, advance a simple unit-basis mathematical model. Compared with the results by FLUENT, and prove its efficiency through JINGHONG hydropower dam tunnels. It is useful for the air conditioning design of a hydropower station and exploitation of temperature drop flow in a underground tunnel.