Abstract: The invention concerns a heating, ventilating and/or air conditioning device comprising at least an air distribution channel having a downstream end, and at least an air diffusing element arranged at said one downstream end. The invention is characterised in that the air diffusing element (1) comprises a support (11) provided with through orifices (17) and covered over at least one of its faces with a material (12, 16), having air resistance ranging between 10 N.s.m −3 and 180 N.s.m−3 .

Abstract: A filtered air vent has a housing with an inlet and outlet, at least one set of spaced apart airflow control elements extending across the housing elements, spaces between the elements, and a pleated filter disposed within the housing. The filter has alternating first and second pleats that open up in opposite first and second directions, respectively. In one exemplary embodiment of the invention, at least a portion of the pleats that open in a first one of the directions are disposed across the spaces between the elements. The filter may be made from a washable filter material such as, for example, woven polypropylene. The elements in one embodiment of the invention are rotatable blades of a damper disposed within the housing and each of the blades are disposed within a corresponding one of the pleats that open in the second direction.

Abstract: A filter medium for an air filter, characterized in that it comprises a filter material having a glass fiber as its primary component and an alkyl ketene dimer adhered to the surface of the glass fiber; and a method for producing the filter medium which comprises a step of subjecting a dispersed slurry of a raw material fiber to a wet papermaking to form a wet paper, a step of immersing the wet paper in an aqueous dispersion or solution of the dimer or a liquid mixture of the dimer and a binder resin, or applying or spraying any of the above-mentioned liquids to the wet paper, to thereby allow the dimer to adhere onto the surface of the glass fiber, and a step of drying the resultant wet paper having the dimer adhered thereto. The filter medium exhibits a reduced amount of an out gas generated when it is used with ventilation and also exhibits high water-repellency and satisfactory strength in various applications such as air conditioning of a building and semiconductor manufacturing.

Abstract: A rotatable brush is located adjacent to and in contact with a ground engaging roller of a cutting unit of a mower to clean debris from the roller surface. The brush includes a brush shaft having at least one flight of brush bristles releasably secured to the brush shaft by a pair of fasteners. This permits easy replacement of the flight of brush bristles without having to replace the brush shaft. One end of the brush shaft is driven by a belt drive system with the driven end of the brush shaft passing through an elongated slot in a pivotally adjustable tensioning plate. The plate can be pivoted to adjust the tension in the drive belt without moving the driven end of the brush shaft, thus not affecting or changing the position of the brush relative to the roller. Drive can be imparted to the belt drive system using a hardened cap screw that is threaded into one end of the shaft of a rotatable reel on a reel cutting unit.

Abstract: A self-propelled agricultural machine having a position-finding system including a position-finding device for detecting positions of guide variables relative to the machine and at least one adjusting device for adjusting the orientation of the region of coverage of the position-finding device relative to the machine. The position of the crop edge detected by the position-finding device is used for adjustment of the orientation of the region of coverage of the position-finding device relative to the machine. The position-finding system provides reliable control of the machine along the path of the crop edge. At least one adjusting device orientates the positioning-finding device relative to the machine for tracking the machine along the detected crop edge. In addition, the signals of a further position-finding device in a feed region of a cutterbar is taken into consideration.

Abstract: A rotary cutting deck has dual, side-by-side cutting chambers each of which houses a rotary cutting blade. The blades rotate so that grass clippings exit to the rear of the cutting deck through a central, rearwardly extending exit tunnel. A pivotal mulch door is located within the exit tunnel with the mulch door swinging between two positions. In one position, the exit tunnel is open to permit operation of the cutting deck in a discharge/collection mode of operation. In the other position, the exit tunnel is closed to convert the cutting deck to a mulching mode of operation. A V-shaped baffle with a forwardly facing apex is placed in the bottom and rear of the exit tunnel to enhance performance in the mulching mode of operation.

Abstract: A cable for a cable lock has a core and multiple outer wires. The outer wires are twisted around the core. At least one of the core and the outer wires is fabricated by multiple twisted threads made of a pliable but strong material. Wherein, the threads are made of Kevlar™ fiber or the like. With such a cable, the cable has both good resilience and good strength. The use of the cable is convenient, and the useful life of the cable is long.

Abstract: The invention concerns a composite synthetic string in particular for a tennis racket. The invention is characterised in that the string consists of central monofilaments (3) surrounded by multifilament yarns (2), the assembly being impregnated and coated with polyurethane (1) and is subjected to tractive bending after it has been formed. The invention is useful for tennis strings with novel appearance, with long life span and quick reaction when hitting a ball.

Abstract: A cable carrier chain having improved strength and flexibility (including improved bilateral flexibility) useful in automotive and other applications contains pivotally joined chain links, each link containing two side plates, two undercut pins, two round apertures which are slightly oversized relative to the pins, a hinged cover lid and a bottom support plate. In the chain, the undercut pins of one chain link are mated with the slightly oversized apertures of an adjacent link, giving the chain increased strength and flexibility. The cover lid preferably includes a hinge member having a relatively thin horizontal strap hinge disposed between two relatively thick vertical hinge straps. The bottom surface of the support plate preferably contains ribs which reduce noise and wear.

Abstract: A three-stage lean burn combustion chamber (28) comprises a primary combustion zone (36), a secondary combustion zone (40) and a tertiary combustion zone (44). Each of the combustion zones (36,40,44) is supplied with premixed fuel and air by respective fuel and air mixing ducts (54,70,92). The fuel and air mixing ducts (54,70,92) have a plurality of air injections apertures (62,64,76,98) spaced apart in the direction of flow through the fuel and air mixing ducts (54,70,92). The apertures (62,64,76,98) reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone (36,40,44). This reduces the generation of harmful vibrations in the combustion chamber (28).

Abstract: According to one embodiment of the invention, a system for altering a fluid flow includes a nozzle having a fluid flow and including a converging portion, a diverging portion downstream of the converging portion, and a throat coupling the converging portion to the diverging portion, at least one port located in a wall of the nozzle and angled with respect to the fluid flow, and at least one pulse detonation device operable to inject a plurality of detonation waves in a pulsed manner through the port and into the fluid flow. The pulsed detonation waves operate to alter the fluid flow.

Abstract: There is disclosed a lobe mixer comprising: a cylindrical partition wall 22 which partitions a high-speed inner flow from a low-speed outer flow; a lobe portion 24 which is disposed on a downstream side of the partition wall and whose transverse sectional shape is a waveform shape and is enlarged on the downstream side; and a connecting reinforcement member 26 which is disposed between lobe side walls 24a extending in a radial direction of the lobe portion to connect the adjacent lobe side walls to each other. The connecting reinforcement member 26 is a thin member disposed along a flow line of a fluid which flows between the lobe side walls.

Abstract: A method is described for controlling decontamination of an emission control device. Temperature of the emission control device is maintained at a desired temperature by operating some cylinders of the engine lean and others rich. These lean and rich mixtures react exothermically in the exhaust gas and in the emission control device to generate heat. Efficient contaminant removal is obtained by oscillating the mixture air-fuel ratio about stoichiometry. This oscillation is provided by adjusting the fuel provided to the rich cylinders, or by adjusting the air provided to the lean cylinders, thereby minimizing any torque disturbance corresponding to the oscillations in exhaust air-fuel ratio.

Abstract: A device for generating a mixture of reducing agent and air, having a mixing space (16) into which reducing agent via a reducing agent delivery conduit (64) and air via an air delivery conduit (61) can be introduced into the mixing space (16), having means for pressurizing the air, in such a way that the air flows essentially at the speed of sound through the air delivery conduit (61).

Abstract: The present invention concerns an diesel engine fuel injection control, and a regeneration control method of exhaust gas post-treatment apparatus using this fuel injection control, and the engine fuel injection control for performing after injections (Fas, Fam) after a main injection (Fm) for activation and regeneration of the exhaust gas post-treatment apparatus, through the rising of diesel engine exhaust gas temperature or the decrease of the oxygen concentration in the exhaust gas, is composed to perform the after injections (Fas, Fam) in a range of 40° ATDC to 90° ATDC of the crank angle.

Abstract: A system for controlling the temperature of a particulate filter coupled to an exhaust outlet of an internal combustion engine includes a controller responsive to volumetric flow and temperature of exhaust gas to determine a filter regeneration parameter. In a hybrid electric-engine vehicle application, various control strategies are implemented as a function of the regeneration parameter to control exhaust gas temperature suitably for proper regeneration of the particulate filter. Such strategies include shifting the duty cycle of the engine toward lower engine speed operation along lines of constant power output, modifying the ratio of electrical power and engine power and controlling recharging of the battery supplying electrical energy to the vehicle's electric drive motor under vehicle deceleration conditions.

Abstract: A small capacity pre-catalytic system (34) is disposed immediately downstream of an exhaust port (18), and a large capacity main catalytic system (35) is disposed immediately downstream of the pre-catalytic system (34). The pre-catalytic system (34) includes finely divided catalyst supports (48), and a third stage heat exchanger (H3) is disposed between these catalyst supports (48) so that a heat transfer tube (49) is bent in a zigzag manner. Fourth stage and fifth stage heat exchangers (H4, H5) are disposed on the upstream side, in the flow of the exhaust gas, of the pre-catalytic system (34), and first and second stage heat exchangers (H1, H2) are disposed on the downstream side, in the flow of the exhaust gas, of the main catalytic system (35). Water is made to flow through the first stage heat exchanger (H1) to the fifth heat exchanger (H5) in a direction opposite to that in which the exhaust gas flows, thereby exchanging heat with the exhaust gas.

Abstract: An exhaust processor comprises a Helmholtz resonance chamber with a variable tuning throat. The tuning frequency of the exhaust processor changes as the outlet opening from the variable tuning throat into the Helmholtz resonance chamber changes.

Abstract: An exhaust processor has an exhaust tube and a cover mounted for rotation at least partially around the exhaust tube to adjust the tuning frequency of the exhaust processor. A method of operating the exhaust processor is also disclosed.

Abstract: This electrical power generating system is applicable in any location where wave action in blowholes produces compressed air.

Abstract: A wind and wave energy plant (1) comprises a windmill with a rotor (3) and a wave-actuated water pump that can drive a turbine whose output shaft is in driving connection with an electric generator. The windmill includes a tubular mill tower (2), which is firmly anchored to the seabed and encloses a storage tank between the sea surface and the mill rotor (3), which tank can be filled with water by means of the pump via a non-return valve, and from which water can be led to the turbine.

Abstract: A hydraulic system for an actuator provides staged operation during extend and retract. A pair of reversible pumps are conjointly driven by a reversible motor. A relief valve in the retract circuit directs fluid to tank when fluid pressure increases above a predetermined value. An unloader valve in the extend circuit is responsive to pressure at a first stage pump to direct flow to tank when the pressure increases above a second predetermined value. A non-return check valve connected between the pumps in the extend circuit closes the flow circuit to the second stage pump during high loads, so that the flow from the second stage pump goes to tank, and the return flow from the actuator goes only to the first stage pump. The non-return check valve is responsive (via a signal line to the retract circuit portion) to the pressure in the extend and retract circuit portions.

Abstract: A method and apparatus for using, converting and/or generating energy comprises disposing a second fluid adjacent at least one receiver and allowing the at least one receiver to rise with respect to a first fluid, the at least one receiver being connected to an output member. The apparatus includes at least one receiver disposed within the first fluid, a second fluid, and an output member connected to the at least one receiver.

Abstract: An external combustion engine having an exhaust flow diverter for directing the flow of an exhaust gas. The external combustion engine has a heater head having a plurality of heater tubes through which a working fluid is heated by conduction. The exhaust flow diverter is a cylinder disposed around the outside of the plurality of heater tubes and includes a plurality of openings through which the flow of exhaust gas may pas. The exhaust flow diverter directs the exhaust gas past the plurality of heater tubes. The external combustion engine may also include a plurality of flow diverter fins coupled to the plurality of heater tubes to direct the flow of the exhaust gas. The heater tubes may be U-shaped or helical coiled shaped.

Abstract: Methods and systems of this invention for positioning a variable geometry member disposed within a variable geometry turbocharger involve determining a boost pressure target for the turbocharger and comparing the same to an actual boost to calculate an error value, errboost.

Abstract: A world threatening explosion has been assessed as overdue for a supervolcano discovered under the US Yellowstone National Park. Recent proposals give a method for the controlled evacuation of the volcanic magma to prevent the explosion. The present proposals are much simpler. The evacuation would be through a single evacuation tube, 10 and 11. Means for heating the hot volcanic magma evacuation flow prevent an unacceptable increase of stickiness in the very long tube. The heating may use small combustion chambers to heat steam, which in turn heats, drives, and stabilises the magma flow by injection from 16. Stability is aided by central cooling, using water jets from nozzles 15 and 17 at the wall.

Abstract: The present invention is converting any environmental heat into a useful form of energy, by utilizing kinetic energy of randomly moving particles, here we use a mechanism which selectively blocks more particles moving in one general direction than particles moving in the opposite direction, for creating a force, or a pressure difference or a flow of particles, and etc, the preferred way to do this is by use a permeable membrane that divided a box into two sub compartments, A and B, the membrane is covered only on one side of it by tiny unidirectional gates, that let passing through of particles from subcompartment B to subcompartment A, but block the passing through back of particles from subcompartment A to subcompartment B, so as a result there will be generated a general flow of gas from subcompartment B to subcompartment A through the membrane, and this flow will rotate the turbine and return back in circulation, and since the particles lost some of their kinetic energy during their pass through the turbi

Abstract: A method for enhancing natural convection and for converting lower temperature dissipated heat to other useful energy and apparatus therefor. Heat energy is transferred to a medium contained with a channel, and natural convection of the medium is utilized to transfer kinetic energy to another type of energy such as electrical energy.

Abstract: A single phase vapor cycle apparatus has a reservoir containing a supply of heated vapor, a turbine for producing a work output, and a compressor downstream of the turbine. The turbine receives the vapor from the reservoir and expands the vapor at an incoming temperature and pressure so that the vapor is exhausted from the turbine at a first temperature and pressure below the incoming temperature and pressure. The compressor receives vapor exhausted from the turbine. Heat is exchanged between vapor entering the compressor and vapor being compressed in the compressor so that the vapor in the compression process is cooled and the vapor entering the compressor is heated to a temperature above the first temperature. The compressed vapor is delivered to the reservoir.

Abstract: During the operation of a steam turbine installation (1), flue gas (RG) produced by combusting a fossil fuel (B) is firstly guided in a high-temperature heat exchanger (3) while exchanging heat with water vapor (WD) which flows in the water-steam circuit (6) of a steam turbine (7) and which is fed to the steam turbine (7) as fresh steam (FD) having a fresh steam temperature (TFD) of preferably greater than 800 ° C. The flue gas (RG) that is cooled down in the high-temperature heat exchanger (3) is subsequently guided in a waste heat stem generator (4) while exchanging heat with feed water (SW), which flows in the water-steam circuit, whereupon inducing the production of water vapor (WD).

Abstract: A first exhaust turbo rotary machine is able to assist turbo supercharging by operating as a motor on power generated in a second rotary machine connected to a power axis of an engine. Also, when exhaust energy is large, the first turbo rotary machine operates as a generator so as to make the second rotary machine connected to the engine motive power axis operate electrically, thereby making it possible to add exhaust energy to the engine motive power axis. Consequently, that which results is a compound engine dynamo-electric machine that improves total efficiency of the engine by adding exhaust energy, which is otherwise discarded, to the engine motive power axis. This arrangement increases engine torque in a speed region where exhaust pressure is low by utilizing part of the engine's motive power as a supercharging driving force.

Abstract: The invention provides a method of operating a gas turbine arranged in a power generation system and comprising a source of compressed air, a combustor having a combustion chamber and multiple burners. A gas turbine controller controls the activation and deactivation of the single burners and/or burner groups according to a switching criterion that is proportional to the difference between a combustion chamber air inlet temperature and a temperature downstream of the combustion chamber. The switching criterion according to the invention fully accounts for large temperature fluctuations of the combustion chamber inlet air, which then result in only relatively small variations in burner equivalence ratio. The invention is particularly suited for application in compressed air energy power generation plants.

Abstract: A method for assembling a flap system for a gas turbine engine exhaust nozzle including a plurality of backbone assemblies facilitates extending a useful life of the exhaust nozzle. The method includes providing a flap basesheet having a width defined between a pair of side edges that are coupled together by a leading edge and a trailing edge, and including at least one stiffener that extends between the basesheet side edges and includes an intermediate portion that has a width that is smaller than that of the basesheet and is at least one of bonded to and formed integrally with the basesheet, and coupling the basesheet to the gas turbine engine with a backbone assembly.

Abstract: A method for assembling a flap and seal system for a gas turbine engine exhaust nozzle including a plurality of backbone assemblies facilitates attaching a basesheet to a backbone. The method includes attaching an attachment system including at least one strap to a basesheet, and coupling the basesheet to a backbone using the attachment system strap.

Abstract: In the NH3 injection rate control method for an NOx removal apparatus, operating area of the apparatus is divided into first area in which molar ratio of NH3 injection rate with respect to NOx flow rate at an inlet of the apparatus is smaller than molar ratio at minimum point where NOx concentration assumes minimum value and second area in which the molar ratio is equal to or larger than the minimum point molar ratio, and virtual NOx concentration with respect to the molar ratio is set according to virtual characteristic line which varies monotonically to stride across desired operating point without rising with increase of the molar ratio from the first area to the second area. Moreover, feedback control is implemented for adjusting the NH3 injection rate with respect to the NOx flow rate in direction that the virtual NOx concentration is brought close to the desired NOx concentration.

Abstract: An improved air turbine starter that includes fluid flow control devices. The devices may be check valves, for example normally open check valves. The check valves may be located in fluid flow paths between the starter and the gearbox to which it is mounted. The starter may also include a ring seal about the output shaft to restrict fluid flow over the shaft.

Abstract: An air turbine starter system and air turbine starter valve that has a microvolume actuator to prevent the connected butterfly valve from opening too quickly. Air turbine starter valves can in some circumstances freeze shut, but may be opened by normal actuator operation. Such operation may open the valve too quickly due to stored potential energy. A sharp pressure transient may be inflicted upon the connected air turbine starter which can cause damage. The microvolume actuator air turbine starter system set forth herein allows generation of sufficient force to break ice and move the valve while minimizing stored potential energy that could open the valve too quickly.

Abstract: A double wall structure (22) for a combustor (15) of a gas turbine engine (10) comprising an inner wall (28) and an outer wall (27), the inner wall (28) comprising a plurality of main tiles (50), the main tiles (50) are secured to the outer wall (27) by a securing means (35), wherein the inner wall (28) further comprises a plurality of edge tiles (52) which are secured to the outer wall (27) by securing means (35), each edge tile (52) overlapping at least one edge (30, 31, 54, 61) of a main tile (50) thereby further securing the main tiles (50) to the outer wall (27).

Abstract: Disclosed is an air conditioner using a thermoelectric module enabling to supply users individually with fresh and pleasant air for cooling/heating. The present invention includes a thermoelectric module having high and low temperature parts discharging and absorbing heat by an electric power, a heat-absorption accelerating means connected thermally to the low temperature part of the thermoelectric module so as to accelerate heat exchange between the low temperature part and an air, and a heat-dissipation accelerating means connected to the high temperature part of the thermoelectric module to accelerate heat exchange between the high temperature part and air so as to cool the high temperature part.

Abstract: The present invention relates to a cooling system for cooling at least one wine or champagne container in a wine or champagne preservation and dispensing apparatus. The cooling system includes a housing; a container support mounted in the housing; a cool air generating unit mounted in the housing; and a circulator mounted in the housing. In one embodiment, the cool air generating unit generates cooled air. The cooled air is circulated in the housing by the circulator to cool the wine or champagne container on the container support. In another embodiment, the container support includes a removable divider which separates the container support into two areas where at least one wine or champagne container is included in each of the areas and at least one of the areas is adjacent to the circulator. The divider includes at least one air baffle to control the amount of generated cooled air circulated in each of the areas by the circulator.

Abstract: A method of operating a frozen beverage machine is disclosed that utilizes a short “burst” heating of the beverage machine's freezing chamber. The method includes monitoring a beverage mixture within the freezing chamber of the frozen beverage machine, and heating the freezing chamber for a predetermined time period in response to the beverage mixture reaching a first predetermined state. The freezing chamber is then refrigerated until the beverage mixture reaches a second predetermined state.

Abstract: The ice maker herein works in the conventional manner wherein a refrigeration system provides for cooling of the evaporated. Water is first circulated over the evaporator as the evaporated is cooled. A temperature sensor is located in a water recirculating system and a microprocessor monitors the temperature of the calculating water. Once a predetermined non-freezing temperature is reached, for example 40 degrees Fahrenheit, water circulation is stopped. However, the compressor continues to run and cool the evaporator for a predetermined period of time to a desired lower temperature. The pump is then turned on and water again circulated over the evaporated initiating the ice making cycle. This process insures that ice adheres to the evaporator and does not prematurely slough off and/or result in the formation of slush.

Abstract: An improved method and apparatus for indirect evaporative cooling of a fluid stream to substantially its dew point temperature. Plate heat exchanger has perforations (11) and channels (3, 4 and 5) for gas on a dry side and wet side. There is a trough formed in a portion of the plate that temporarily holds evaporative fluid which is in contact with the wick material on the wet side surface of the plate. The evaporative fluid flows through the trough by way of liquid perforations into the next trough. The trough of a plate with a wet side up, the liquid perforations are on the side creating a reservoir to wet the opposing wick materials. As streams flow across the dry side (9), transferring heat to the plate. Working gas stream (2) flows across the dry side and through perforations to channels (5) on wet side (10), which it then cools by evaporative cooling as well as conductive and radiative transfer of heat from plate.

Abstract: The invention is based on a method for operating a climate control system for a vehicle, in the case of which a compressor (38), in a cooling mode, circulates a coolant through a gas condensing apparatus (42) and an expansion device (50) to a passenger-compartment heat exchanger (44) and, in a heating mode, circulates the coolant in the reverse direction of flow first through the passenger-compartment heat exchanger (44), the expansion device (50), and then through the gas condensing apparatus (42), in parallel with which a bypass line (56) comprising a switching valve (58) is provided. It is proposed that, in the heating mode, the switching valve (58) in the bypass line (56) is opened and the flow of coolant through the gas condensing apparatus (42) is stopped as soon as a layer of ice that exceeds a limit thickness has formed on the air side of the gas condensing apparatus (42).

Abstract: A refrigerator has a fresh food compartment (3) adapted for maintaining the contents at a temperature above freezing. A vapour compression refrigeration system is operable in one mode so that an evaporator (7) is operated at a temperature within 10° C. of the temperature desired in the fresh food compartment (3) and a supply of air is maintained over the evaporator (7) and in to the compartment (3). The vapour compression system is used in a defrost mode in which the vapour compression refrigeration system is stopped or allowed to operate without significant heat extraction at the evaporator (7), and a supply of air above 0° C. is past over it. Operating the fresh food compartment evaporator (7) at such a high temperature (close to 0° C.) reduces the rate of frost build up and the under cooling of frost. Frost may be adequately removed by an ambient air flow without heater supplementation.

Abstract: A method for controlling a vehicle air-conditioning system for cooling an interior of a vehicle is disclosed. The vehicle air conditioning system has a compressor coupled to an electronic control valve.

Abstract: An ejector for a refrigerant cycle includes a nozzle having therein a refrigerant passage, and a needle valve provided in the refrigerant passage of the nozzle upstream from a throat portion of the nozzle. The needle valve is disposed in the nozzle to define therebetween a throttle portion that is positioned upstream from the throat portion. A top end portion of the needle valve and an inner wall of the nozzle are formed, so that refrigerant is decompressed to a gas-liquid two-phase state at upstream of the throat portion. Accordingly, a throttle degree of the nozzle can be variably controlled while ejector efficiency is not deteriorated.

Abstract: A refrigeration circuit (1) sequentially connected to a compressor (10), a condenser (11), an electric expansion valve (13), an evaporator (17), and an intake proportional valve (21). When the freezing capability of the refrigeration device is to be suppressed, a control means (30) will restrict the intake proportional valve (21) in order to place refrigerant in a discharge side of the evaporator (17) in a wet saturated steam state, and the electric expansion valve (13) will be set to an aperture such that the refrigerant in the interior of the evaporator (17) will be placed in the wet saturated steam state.

Abstract: A capacity control valve that implements an accurate pressure control of a valve body by preventing unwanted pressures from influencing on the valve body and that alters the function of a control chamber such that the pressure within the control chamber to which a control pressure is supplied can quickly be modulated. In the capacity control valve, a valve opening joint portion which is integral with a valve body can rapidly be disengaged from an engagement portion which is integral with a pressure sensing device, hence a quick lifting of the valve body so as to modulate the capacity or pressure in the control chamber.

Abstract: A heat transfer engine having cooling and heating modes of reversible operation, in which heat can be effectively transferred within diverse user environments for cooling, heating and dehumidification applications. The heat transfer engine of the present invention includes a rotor structure which is rotatably supported within a stator structure. The stator has primary and secondary heat exchanging chambers in thermal isolation from each other. The rotor has primary and secondary heat transferring portions within which a closed fluid flow circuit is embodied. The closed fluid flow circuit within the rotor has a spiraled fluid-return passageway extending along its rotary shaft, and is charged with a refrigerant which is automatically circulated between the primary and secondary heat transferring portions of the rotor when the rotor is rotated within an optimized angular velocity range under the control of a temperature-responsive system controller.