A simplified model of heat and moisture transfer for tailrace tunnel ventilating in hydropower station

Tailrace tunnel ventilating can be used as a highly efficient and energy saving air conditioning for factory buildings in hydropower stations. This paper describes a simplified model of heat and moisture transfer for tailrace tunnel ventilating system with the assumption of isothermal boundary for tunnel wall, and constructs a small-scale experimental set-up to simulate the heat and moisture transfer process during the air flowing through the tunnel. The model has been validated against the experimental and field-test data, and it shows a good agreement. This simplified model is intended for use in annual performances prediction of heat and moisture transfer or provides the design tools for tailrace tunnel ventilating system in hydropower stations.