Abstract: A nozzle assembly for a fan unit includes an inner nozzle having a tapered outer diameter and a flow path radially inward from the tapered outer diameter with respect to a longitudinal axis of the nozzle assembly. The flow path is configured to guide a fluid flow and to expel the fluid flow through an inner outlet of the inner nozzle to a surrounding environment. The nozzle assembly also includes an outer nozzle disposed radially outward from the inner nozzle with respect to the longitudinal axis. The outer nozzle and the tapered outer diameter of the inner nozzle define an annular flow path therebetween. The annular flow path is configured to guide the fluid flow and to expel the fluid flow to the surrounding environment through an outer outlet of the outer nozzle. A cross-sectional area of the outer outlet is adjustable via movement of the inner nozzle, the outer nozzle, or both along the longitudinal axis of the nozzle assembly.

Abstract: A wind-powered rooftop ventilator that can create both positive and negative pressures to enable the exhaust and intake of air is described. The wind-powered rooftop ventilator includes a symmetrical cap that is aerodynamically shaped such that, when wind flows against the back of the symmetrical cap, a negative pressure area is created at the front opening of the symmetrical cap, thereby enabling the exhaust of air from an indoor area. When wind flows against the front opening of the symmetrical cap, the wind is captured by the symmetrical cap, thereby enabling the intake of air into an indoor area. As such, the wind-powered rooftop ventilator can create both positive and negative pressures without use of an external power source, fan, and/or worm gear.

Abstract: An exhaust fan assembly is provided for expelling contaminated air from a building. The assembly includes a plenum, a fan assembly attached to the plenum, and a windband mounted on top of the fan assembly. The fan assembly is constructed of cylindrical outer and inner walls which define a bearing chamber and surrounding annular space. A fan driven by a shaft extending downward from the bearing chamber draws exhaust air from the plenum and blows it up through the annular space to a nozzle at the top of the fan assembly.

Abstract: An improved method and system for flue gas recirculation (FGR) from the ID Fan located downstream of a scrubber (or other Air Quality Control Equipment including cyclones, baghouses, etc., hereafter “AQC equipment”) back to the scrubber (or other AQC Equipment) inlet to maintain the minimum required flue gas throughput during low-load conditions, thereby eliminating the need for a separate booster fan. A flue gas recirculation duct is connected from downstream of the ID Fan to the inlet of the scrubber (or other AQC Equipment). A variable flow restrictor is placed in the duct downstream of the ID Fan for controlling pressure of the recirculated flue gas. The flow restrictor is controlled in accordance to a function of boiler load or flue gas flow to produce the required backpressure that enables the flue gas to flow through the recirculation duct back to the inlet of the scrubber (or other AQC Equipment) at low loads.

Abstract: A wind-powered rooftop ventilator that can create both positive and negative pressures to enable the exhaust and intake of air is described. The wind-powered rooftop ventilator includes a symmetrical cap that is aerodynamically shaped such that, when wind flows against the back of the symmetrical cap, a negative pressure area is created at the front opening of the symmetrical cap, thereby enabling the exhaust of air from an indoor area. When wind flows against the front opening of the symmetrical cap, the wind is captured by the symmetrical cap, thereby enabling the intake of air into an indoor area. As such, the wind-powered rooftop ventilator can create both positive and negative pressures without use of an external power source, fan, and/or worm gear.

Abstract: An exhaust fan assembly is provided for expelling contaminated air from a building. The assembly includes a plenum, a fan assembly attached to the plenum, and a windband mounted on top of the fan assembly. The fan assembly is constructed of cylindrical outer and inner walls which define a bearing chamber and surrounding annular space. A fan driven by a shaft extending downward from the bearing chamber draws exhaust air from the plenum and blows it up through the annular space to a nozzle at the top of the fan assembly.

Abstract: An exhaust system for expelling air from a building includes an outlet nozzle that improves entrainment of ambient air with the building exhaust air. The improved air entrainment results in increased exhaust air dilution and plume height to better disperse the exhaust air away from the building. The nozzle has an H-shaped outlet configuration with two lateral outlet sections joined by a central transverse outlet section. The nozzle has a pair of outer lateral walls, a pair of outer transverse walls, and a pair of sloped inner lateral walls that angle outwards from near an inlet end of the nozzle towards corresponding outer lateral walls. The nozzle can be part of the exhaust system at the outlet side of the exhaust fan within a windband that aids in entraining ambient air with the exhaust air exiting the nozzle.

Abstract: Apparatus to convert LNG to gas, comprising a vaporizer having passages to pass the cool or cold LNG in heat transfer relation with warming gas flowing downwardly to discharge in multiple directions, and flow control means to control discharge of the gas flow in selected direction or directions, as a function of wind direction.

Abstract: An exhaust gas discharging apparatus for connection to an exhaust gas fan including an exhaust gas nozzle comprising a duct device forming at least one exhaust passage that extends between first and second open ends. The duct device has at least one exterior duct wall forming at least two longitudinally extending bent wall portions that are distributed evenly about the periphery of the duct device with each bent wall portion sloping towards the longitudinal axis in the region of the second end. An annular cap or wind band is connected to the duct device and is disposed about and spaced apart from the second end of the duct device. The cap has a cap inlet located below the second end and outside the duct device and a cap outlet located outwardly from the second end in the longitudinal direction. Vertically extending wind deflecting panels are mounted on the duct device and extend horizontally outwardly and these panels extend vertically below the cap.

Abstract: An exhaust gas nozzle comprising a duct member forming a single exhaust passage and defining an open first end, an open second end, and a centrally-disposed longitudinal axis extending between the first end and the second end. The duct member includes at least a pair of bent wall portions spaced-apart from one another, these bent wall portions extending from the first end to the second end and gradually and increasingly pinching the passage from the first end to the second end. An annular, open-ended windband is connected to the duct member and disposed about the exterior of and in spaced, coaxial relation to the second end. A windband inlet is located below and in the region of the second end and outside the duct member.

Abstract: A chimney exhaust system for facilitating or creating an upward draft in a chimney flue, operating on what is referred to as "Bernoulli's Principle" comprises a housing unit having a tubular cross member and a tubular depending member, both members having an inlet and an outlet. The outlet of the depending member intersects the cross member at an intermediate position between the inlet and outlet of the cross member. The depending member is mounted to a chimney flue at its inlet and acts as an extension thereof. A fan is attached to the housing unit proximate the cross member to generate air flow through the cross member and across the opening of the depending member's outlet. The air flow generated through the cross member creates an upward draft of the air in the chimney flue and the depending member.