Abstract: A room pressure controlling system having a local exhaust valve, a supply air valve, a common exhaust air valve, controllers and a differential pressure sensor. The controller calculates a correction control output value for the valve operated as the room pressure controlling valve, which is either the supply air valve or the common exhaust air valve, based on a setting value and a room pressure measured by the differential pressure sensor. The controller evaluates whether or not the supply airflow rate and/or the exhaust airflow rate is changing, and if an airflow rate is changing, emphasizes rapid responsiveness of the room pressure control than a reduction in the frequency of actuation of the room pressure controlling valve, if the airflow rate is stable, the controller emphasizes the reduction in the frequency of actuation of the room pressure controlling valve than the rapid responsiveness of the room pressure control.

Abstract: A room pressure controlling system having a supply air valve, a common exhaust air valve, controllers, and a differential pressure sensor. The controller gradually changes a supply and an exhaust airflow rates when there is an airflow rate change controlling operation, and calculates, based on a setting value and a pressure difference that is measured by the differential pressure sensor, a correction control output value for the valve being operated as the room pressure controlling valve, and if the sum value of the control output value and the correction control output value is a value that causes operation of the room pressure controlling valve in the direction opposite of the desired direction, suspends the output of the sum value, but if the value causes the room pressure controlling valve to operate in the desired direction, outputs the sum value to the room pressure controlling valve.

Abstract: In a hot-water storage type heating unit 1, a liquid-liquid heat exchanger 15, which exchanges heat between a first hot-water circulation circuit 12 through which hot water stored in a hot-water storage tank 11 circulates and a heating circulation circuit 14 in which the hot water flows from a radiator unit 3 for heating, is disposed above the hot-water storage tank 11, and a circulation pump 16 is disposed in the first hot-water circulation circuit 12 on the downstream side of the liquid-liquid heat exchanger 15. In order to return the gas, which is separated by a gas-liquid separator 17 provided so as to be interposed in the first hot-water circulation circuit 12 between the liquid-liquid heat exchanger 15 and the circulation pump 16, to the hot-water storage tank 11, a return passage 18 which communicates between the hot-water storage tank 11 and the gas-liquid separator 17 is provided.

Abstract: The present disclosure is directed to a system and method of providing energy to a dwelling. An engine is housed within an inner tank, which is in turn housed within an outer tank. The engine provides electricity which is used for a dwelling. Exhaust fumes from the engine are piped through a series of heat-exchanging tubes within the outer tank to heat potable water within the outer tank. Water enters the potable tank at a bottom of the tank, and warms as it rises through the outer tank toward an outlet near a top of the outer tank. Hot, potable water is provided from the top of the outer tank to the dwelling. Condensate from the exhaust is captured and used as potable water. Heat, vibration, and acoustic energy from the engine is captured by the fluid in the inner tank and transferred to the outer tank.

Abstract: A single valve door thrust recovery outflow valve is provided that does not rely on a relatively large and expensive actuator to move it, and does not create unwanted drag during aircraft cruise operations. The valve includes a valve frame, a valve door, and an aerodynamic flap. The valve door is rotationally coupled to the valve frame, is adapted to receive a drive torque, and is configured, upon receipt of the drive torque, to rotate between a closed position, a full-open position, and a plurality of partial-open positions between the closed position and the full-open position. The aerodynamic flap is coupled to the valve door. When the valve door is in the closed position and in numerous partial-open positions, the aerodynamic flap makes the thrust recovery outflow valve aerodynamically clean.

Abstract: An airflow module for being received in a module bay of a data storage device enclosure is disclosed. The airflow module comprises a body having: a first face having a first opening therein; a second face having a second opening therein, the first face being adjacent to the second face; and, an airflow channel between the first opening and the second opening so as to allow the passage of air between the first opening and the second opening. The first and second openings are arranged to co-operate with airflow openings in modules positioned in adjacent bays of a said data storage device enclosure to direct a cooling stream of air between said modules in use. The airflow channel is free from components that generate substantial amounts of heat in their normal operation.

Abstract: The present invention provides a method for utilizing an oil-fired heat exchange system to fracture a subterranean formation at a remote work site to produce oil and gas. The method of the present invention includes using a single-pass tubular coil heat exchanger contained within a closed-bottom firebox having a forced-air combustion and cooling system to heat the treatment fluid. The rig also includes integral fuel tanks, hydraulic and pneumatic systems for operating the rig at remote operations in all weather environments. In a preferred embodiment, the method of the present invention includes using an oil-fired heat exchanger system to heat water on-the-fly (i.e., directly from the supply source to the well head) to complete hydraulic fracturing operations. The method of the present invention also includes adding chemical additives and proppants to the heated treatment fluid prior to injection into the formation.

Abstract: An air guiding element (10) for an aircraft air conditioning system comprises a housing base body (12), in which an air inlet opening (14) and an air outlet opening (16) are constructed. A first flow control element (28) is arranged in the housing base body (12), relative to the direction of the air flow through the air guiding element (10), upstream of the air outlet opening (16). The first flow control element (28) comprises a plurality of air guiding channels (30) which are surrounded by a noise-absorbing material (32).

Abstract: A cam and lever system comprising a cam having a side perpendicular to an axis of rotation of the cam and a channel on the side of the cam, the channel having a bottom wherein the channel is at least partially defined by a first wall and a second wall that diverge as the distance from the bottom increases, a lever, having a pin extending into the channel and an axis of rotation that is generally parallel to the axis of rotation of the cam, and having a configuration sufficient to provide point contact with the walls of the channel.

Abstract: A method of estimating a floor temperature of a solid floor that has a fluid conduit embedded in the floor. Provided is a control scheme that provides a sequence, where the concrete temperature can be estimated through the temperature of the fluid in the conduit embedded in the floor. After the concrete temperature is obtained, a heating sequence can be initiated for providing fast and accurate control of the floor temperature.

Abstract: A system may include a tube through which hot fluid is transported from one end to another, wherein the tube radiates heat energy and transfers heat energy to surrounding air by convection. The system may also include a reflector that reflects the radiated heat and a hood that captures the heat energy from the surrounding air through convection, wherein the hood radiates the captured heat energy. The reflector may include a bi-involute curved surface.

Abstract: A method of increasing the efficiency of a boiler includes determining a proportional time period reflecting how long a thermostat is requesting heat from the boiler within a predetermined time period, determining a cycle frequency reflecting the number of times the thermostat is requesting heat from the boiler within the predetermined time period, and adjusting an energy input provided to the boiler in dependence upon the proportional time period and the cycle frequency.

Abstract: An aspirating induction nozzle for vertical connection to the outlet of a pressurized exhaust gas flow comprises a central nozzle surrounded by a wind band and one or more guide vanes. Ambient air is induced into a mixing zone within the central nozzle to dilute the primary effluent and increase the volumetric discharge flow rate to achieve greater plume lift. The mixing zone within the central nozzle is protected from crosswind influences, which would otherwise diminish plume lift.

Abstract: A tamper resistant enclosure for an electronic circuit includes an inner copper case, a tamper sensing mesh wrapped around the inner case, an outer copper case enclosing the inner case and the tamper sensing mesh, and a venting device forming a vent channel from inside the inner case to outside the outer case, the vent channel passing between overlapping layers of the tamper sensing mesh and having at least one right angle bend along its length. The venting device consists of two strips of a thin polyamide coverlay material laminated together along their length, and a length of wool yarn sandwiched between the two thin strips and extending from one end of the strips to the other end of the strips to form the vent channel. The length of yarn follows a zig-zag path between the first and second strips, the zig-zag path including at least one right angle bend.

Abstract: The present invention provides a method for utilizing an oil-fired heat exchange system to fracture a subterranean formation at a remote work site to produce oil and gas. The method of the present invention includes using a single-pass tubular coil heat exchanger contained within a closed-bottom firebox having a forced-air combustion and cooling system to heat the treatment fluid. The rig also includes integral fuel tanks, hydraulic and pneumatic systems for operating the rig at remote operations in all weather environments. In a preferred embodiment, the method of the present invention includes using an oil-fired heat exchanger system to heat water on-the-fly (i.e., directly from the supply source to the well head) to complete hydraulic fracturing operations. The method of the present invention also includes adding chemical additives and proppants to the heated treatment fluid prior to injection into the formation.

Abstract: Disclosed is a fixing structure for ventilator cover spring, comprising a fixing component, a connector, a movable part, and a cover spring. The fixing component is a U-shaped protrusion formed on a cover and has a top wall and two leg walls, a first opening and a second opening are respectively formed in the two leg walls. Two cuts are formed at two ends of the connector, wherein each cut is provided with a tongue, the connector being inserted through and fixed in the first opening and the second opening. The movable part has a head portion and a foot portion, wherein the head portion is fixed on the connector, and the foot portion extends toward the top wall. The cover spring is fitted over the foot portion and is confined on the foot portion.

Abstract: A system for heating a facility is provided. The system includes a first inlet from a district heating system. A heating system is arranged having a condensate outlet. A hyper-condensate recycler is provided having a second inlet coupled to the condensate outlet and a third inlet coupled to the first inlet. The hyper-condensate recycler includes a first outlet. A separator having a fourth inlet is coupled to the first outlet, the separator further having a second outlet fluidly coupled to the first inlet.

Abstract: A dishwasher having a water vapor vent structure is provided. The water vapor vent structure may include an outer cover having one or more water vapor vents, and an inner cover detachably mounted to the outer cover and having condensation channels for condensing water vapor. As water vapor is collected and maintained in the condensation channels for a period of time, condensation efficiency may be enhanced, and air quality in a room in which the dishwasher may be maintained at an acceptable level.

Abstract: A hybrid solar attic vent comprising a housing configured to be mounted on the roof or in the gable of a building in communication with the attic of the building. A photovoltaic solar panel is positioned to be exposed to sunlight and to power the attic fan when sufficient sunlight is present. An alternative source of energy, which may be the building's AC power, is connected to the fan through an electronic control module. The control module monitors the output of the solar panel and switches the fan's power source from solar power to the alternative source of energy when the solar panel produces insufficient electrical energy to power the fan. A thermostat allows operation of the fan by the alternative power source only when the temperature in the attic is above a predetermined threshold.

Abstract: A room heating device includes a supporting body, a thermoacoustic element, a first electrode and a second electrode. The thermoacoustic element is disposed on the supporting body. The first electrode and the second electrode are connected to the thermoacoustic element. The first electrode is spaced apart from the second electrode.