36results about How to "Improve isentropic efficiency" patented technology

A refrigerant system is provided with at least two sequential stages of compression. An intercooler is positioned intermediate the two stages. The refrigerant flowing through the intercooler is cooled by a secondary fluid such as ambient air. A vapor / liquid injection function is also provided for the refrigerant system. The intercooler function and the vapor / liquid injection function are selectively activated on demand depending on environmental conditions and thermal load in a conditioned space. This invention is particularly important for the CO2 refrigerant systems operating in the transcritical cycle.

Cold-heat effect of shock oscillation tube combined with jet oscillation technique is adopted in the invention to reach purpose of refrigeration. The machine is composed of main machine body, static ejector nozzle, oscillation receiving tube and acoustic oscillator etc. Under combined action of gas distributor and acoustic oscillator, gas is jetted in periodic deflexion and periodic intermittent into receiving tubes around to generate flow in high frequency oscillation. Further, under interaction effect and inference of series of wave including shock wave, compression wave and expansion wave, the machine completes unsteady expanding work and energy conversion so as to realize refrigeration through gas. Features are simple structure adjustable continuous flow, suitable to work medium in phases of gas and liquid.

The invention provides an axial flow type turbine with a small blade structure. The axial flow type turbine comprises a hub, a plurality of main blades and a plurality of small blades, wherein the hub is provided with a front end surface and a circumferential surface; the plurality of main blades are evenly arranged on the circumferential surface of the hub and are provided with pressure surfaces, force absorbing surfaces and main blade connecting surfaces, and the main blade connecting surfaces are provided with first front edges; and the small blades and the main blades are alternately arranged, the small blades are provided with small blade connecting surfaces, and the small blade connecting surfaces are provided with second front edges. The radial height of the small blades is h, the radial height of the main blades is H, and h / H is 0.05-0.3. The axial chord length of the small blade connecting surfaces is L1, the axial chord length of the main blade connecting surfaces is L2, and L1 / L2 is 0.2-0.6. The axial length from the second front edges of the small blade connecting surfaces to the first front edges of the main blade connecting surfaces is m, and m / L is 0-0.4. The circumferential angle between the first front edges of the two adjacent main blade connecting surfaces is theta1, the circumferential angle between the first front edges of the main blade connecting surfaces and the second front edges, corresponding to the force absorbing surfaces, of the small blade connecting surfaces is theta2, and theta2 / theta1 is 0.3-0.8.

The invention discloses a device capable of adopting a secondary flow mechanism and improving the non-azeotropic working medium Rankine cycle efficiency. The device comprises a steam generator, an expansion mechanism, an electric generator, a condenser, a liquid accumulator, a working medium pump, a preheater and a control mechanism. The device solves the heat transfer deterioration problem generated in the evaporation heat transfer process of non-azeotropic mixed working media, and heating of high-pressure side working medium fluid is divided into two steps carried out by the preheater and an evaporator, and a plate type heat exchanger with the small resistance loss and high heat exchange coefficients is adopted by the preheater and is used for removing supercooling of the working media. The optimized-design secondary flow mechanism is adopted by the evaporator, the disturbance and mixing action is introduced, the heat transfer mass transfer resistance added by the non-azeotropic working media is overcome, and the cycle efficiency is improved. The device is widely applied to efficient utilization of medium and low temperature heat energy, the medium and low temperature heat energy can be efficiently converted into mechanical energy and electric energy, and waste heat utilization of renewable energy sources is promoted.