Experimental study on wind energy converting to heat by increasing fluid pressure and flow throttling

The effect of conversion of wind energy to heat energy on the theory of flow throttle and friction was analyzed. The temperature of working fluid in the tube increased by 50°C in 3 hours on the 800 W experimental set. A rise of fluid temperature during the experiments was consistent with the analytical solution. The energy and heat transfer equations can predict temperature variation of working fluid in the set of wind energy converting to heat and this is benefit for its heat exchanger design. It concluded that the conversion efficiency of wind energy to heat directly was higher than that of wind energy to electricity. As for choosing the working fluid, its integral physical and chemical characteristics such as dynamic viscosity (μ), specific heat (c_p), density (ρ), throttle differential effect (α _h), temperature-saturated steam pressure (t-P) shoud be optimized. In addition, to design the pneumatic impeller, blade, fluid pump and throttle for a wind power boiler, its performance and operating stability in off-design state its energy conversion efficiency in design state should be considered.