Abstract: A heat exchanger including a first plate and a second plate spaced apart from the first plate that defines a first gap between inner surfaces of the first plate and the second plate in which a first fluid circulates, where a major portion of the first gap is free of obstructions, where a second fluid contacts an outer surface of the first or second plate for heat exchange with the first fluid, where a first peripheral wall on the periphery of the first gap has a curved profile inside the first gap, and at least one inlet is radially positioned with respect to the first gap and injects the first fluid in the gap, and least one outlet is centrally positioned in one of the first and the second plate to enable the first fluid to exit the first gap, where first fluid circulates in a swirling flow in the major portion of the first gap.

Abstract: A system for calibrating a wind indicator device of a wind turbine of the horizontal-axis type in which a shaft has a portion in a nacelle, the wind indicator device being on an exterior of the nacelle. The system comprises a shaft interface adapted to be positioned on the shaft of the wind turbine in a known manner relative to an orientation of the shaft. An extended body is connected to the shaft interface, the extended body projecting from the shaft interface positioned on the shaft to an exterior of the nacelle. An alignment device is connected to the extended body, the alignment device having a visual indicator at the exterior of the nacelle representative of an orientation of the shaft of the nacelle when the shaft interface is positioned on the shaft in the known manner, whereby a calibration of the wind indicator device is achieved using the visual indicator device. A method for calibrating the wind indicator device is also provided.

Abstract: A heat exchanger including a first plate and a second plate spaced apart from the first plate that defines a first gap between inner surfaces of the first plate and the second plate in which a first fluid circulates where a major portion of the first gap is free of obstructions, where a second fluid contacts an outer surface of the first or second plate for heat exchange with the first fluid, where a first peripheral wall on the periphery of the first gap has a curved profile inside the first gap, and at least one inlet is radially positioned with respect to the first gap and injects the first fluid in the gap, and least one outlet is centrally positioned in one of the first and the second plate to enable the first fluid to exit the first gap, where first fluid circulates in a swirling flow in the major portion of the first gap.

Abstract: Disclosed herein are cracking catalysts useful in the thermo-catalytic cracking (TCC)—formerly called selective deep catalytic cracking (SDCC)—of petroleum naphthas, gas oils and other heavy hydrocarbon distillates to selectively produce light olefins, said catalyst comprising mesoporous mixed oxides modified by the presence of inorganic compounds containing chemical elements selected from phosphorus, sulfur, chlorine and mixtures thereof, said catalyst being supported on yttria stabilized zirconium oxide and/or aluminum oxide. Preferably, the catalyst will have the the following formula: (a) MoO3 and/or WO3; (b) La2O3; (c) CeO2; (d) P, S or Cl; (e) ZrO2; (f) Y2O3. Also preferably, the catalyst will be combined with a material selected from an acidic crystalline (modified or not) zeolite, an acidic silica molecular sieve and an acidic alumina. Also disclosed are methods of making said cracking catalysts. The cracking catalysts can be used in both mono- and dual reactor configurations.