Abstract: A dual configuration ERV can be connected directly to an east facing wall or west facing wall without requiring unnecessary conduit to accommodate the different configurations. Ports 1 and 2 are interchangeable so that Port 1 can be configured as a outside air port or a return air port, and port 2 can be configured oppositely and similarly. Each of these ports has associated therewith a temperature sensor and a fan. A controller interrupts a fan when the temperature is below a predetermined value so thereby preventing or lessening frost buildup on the heat exchanger core.

Abstract: The utility model is intended for use in ventilation and air conditioning systems at industrial, housing, and social and administrative facilities for supply and exhaust ventilation of small premises with limited installation space. The technical result is achieved by improving the operation of supply and exhaust ventilation unit through the use of additional elements (sensors) that will allow to automate the process.

Abstract: The optimized mine ventilation system of this invention supplements mine ventilation basic control systems composed of PLCs (Programmable Logic Controllers with human machine interfaces from vendors such as Allen-Bradley™, Modicon™ and others) or DCSs (Distributed Control System from vendors such as ABB™ and others) with supervisory control establishing a dynamic ventilation demand as a function of real-time tracking of machinery and/or personnel location and where this demand is optimally distributed in the work zones via the mine ventilation network and where the energy required to ventilate is minimized while totally satisfying the demand for each work zones. The optimized mine ventilation system operates on the basis of a predictive dynamic simulation model of the mine ventilation network along with emulated control equipment such as fans and air flow regulators.

Abstract: An integrated heating unit operates in a first heating mode, in which the heat of combustion gases is transferred to return air, and a second heat recovery mode, in which the heat of exhaust air is transferred to fresh air. The heating unit of the present invention utilizes the same heat exchanging unit and fans to transfer the heat from the combustion gases to the return air and to transfer heat from the exhaust air to the fresh air. The exhaust air is recovered from a select group of rooms, e.g. kitchens and bathrooms. A secondary heater can also be provided in the integrated unit in the form of a fireplace for providing an alternate or an additional source of the combustion gases.

Abstract: A defrost system for a heat recovery ventilator/energy recovery ventilator (HRV/ERV), uses the interior space supply air of an integrated fan coil for defrosting a HRV/ERV core without creating negative pressure in the interior space, which wastes energy, without need of an external fifth port from which to draw defrost air from the interior space, which increases costs, and without re-circulating exhaust air into the interior space. During the defrost cycle, automatically controlled dampers close off the fresh air and exhaust air inputs, and exhaust output, and circulate supply air through the heat exchange core and into to the living space.

Abstract: A drive for opening and closing air flow control devices, such as ventilation curtains, in a poultry house or the like includes a ball screw drive which is automatically disengaged during a power failure to allow the air flow control devices to drop open partially or fully. Upon restoration of power, the air flow control device is automatically restored to a set position. A digital controller receives inputs from a thermostat and/or pressure sensor which cause periodic actuation of a gear motor that rotates the ball screw and thereby moves a block to which one or more ventilation curtains are attached by means of lifting cables. An electromagnetically actuated brake is attached to the motor which holds its output shaft in position during normal operation.

Abstract: In the extrusion of hollow core concrete slabs, the density profile across the slab is controlled by the vibration of a hammering plate forming one side of a packing chamber through which the concrete is extruded. Vibrations are imparted to the hammering plate by a vibrator that acts to produce vibratory motions in the plate that are not parallel to the direction of extrusion. With two vibrators producing vibratory components both in the direction of extrusion and outwardly to opposite sides of the packing chamber, the flow of concrete to the side edges of the slab is augmented. In an auger-type extruder, this allows the outer augers to be run at a slower speed than otherwise, thus increasing their service life. The vibratory frequency may also be reduced considerably, thus reducing the noise generated by operation of the apparatus.

Abstract: Auxiliary or stub augers are used in conjunction with a convention auger machine that is used to form reinforced hollow cored slabs. They can be used to ensure consolidation of concrete above the cores particularly and relatively in large diameter slabs or can be substituted for one or more of the conventional core forming augers if a core or bore is not required in the slab at that location. The stub auger consists of a first portion having a non tapering shaft and a non tapering flight thereon. The second or downstream portion has a gradually reducing diameter shaft with the flight which continues from the flight around the first portion, decreasing in diameter to substantially zero at the extreme downstream end of the shaft.

Abstract: An auger assembly is provided which includes a core, the surface of which increases in diameter from the upstream end towards the downstream end. The auger flighting upon the core, however, maintains a constant diameter from the upstream end towards the downstream end so that the depth of flighting gradually decreases to zero at the downstream end. This means that the maximum thrust against the concrete being augered occurs at a negative angle of approximately 105.degree., said thrust being at right angles to the surface of the core. This produces a negative flow of the concrete thus contradicting the free concrete flow required in order to provide the necessary bond between the concrete and the cables. The present invention reduces this surface angle to an angle of approximately 90.degree., or having the surface substantially parallel to the longitudinal axis.

Abstract: This invention relates to a ventilation system and more particularly to means for restraining a ventilation control curtain composed of a post like members formed of an elongate containers of flexible material filled with material such as mine debris which give them a degree of rigidity and mass. The post like constraining members check the horizontal displacement of the mine curtain thereby forming a stable curtain structure which may be used as an efficient gas flow director within the mine or to isolate a desired area of the mine to contain mine gas or airborn particulates. They are sufficiently yieldable to offer no collision hazzard to personnel or machinery. The envelopes forming curtain constraints are disclosed as individual elements and as integral pockets on the face of the curtain.