95results about How to "Reduce heat exchange efficiency" patented technology

There is provided a circulation type hot water supply device in which a downstream end of a hot water delivering channel 6 connected to a heat exchanger 4 of a water heater 1 is connected to a water supply channel 5 upstream of the heat exchanger, and a circulating pump 25 that returns hot water fed from the heat exchanger to the hot water delivering channel to the heat exchanger through the water supply channel is provided in the hot water delivering channel. The device can reliably identify an abnormality when it occurs, such as adhesion of a deposit to an inner surface of a heat absorbing pipe 4b to reduce heat exchange efficiency. A diagnosis is started when a hot water delivering tap 7 is closed and a burner 3 is subjected to combustion. In the diagnosis, supply of water to the heat exchanger 4 is first stopped to shut down the burner 3. Then, the presence of an abnormality is determined when an amount of increase of a detection temperature from a hot water delivering temperature sensor 20 reaches a predetermined threshold value or more.

There is provided a circulation type hot water supply device in which a downstream end of a hot water delivering channel 6 connected to a heat exchanger 4 of a water heater 1 is connected to a water supply channel 5 upstream of the heat exchanger, and a circulating pump 25 that returns hot water fed from the heat exchanger to the hot water delivering channel to the heat exchanger through the water supply channel is provided in the hot water delivering channel. The device can reliably identify an abnormality when it occurs, such as adhesion of a deposit to an inner surface of a heat absorbing pipe 4b to reduce heat exchange efficiency. A diagnosis is started when a hot water delivering tap 7 is closed and a burner 3 is subjected to combustion. In the diagnosis, supply of water to the heat exchanger 4 is first stopped to shut down the burner 3. Then, the presence of an abnormality is determined when an amount of increase of a detection temperature from a hot water delivering temperature sensor 20 reaches a predetermined threshold value or more.

In a revolution type compressor using a balance weight for balancing a rotating mass, the effect of oil churn reduction is enhanced, and compressor input is reduced. A balance weight fixed to a drive shaft between a rotor of an electric motor 4 and a compression mechanism includes a weight portion in a substantially semicircular column shape for balancing a rotating mass, a cover portion which is substantially semi-cylindrical and has an opening in the vicinity of a top and bottom at an opposite side in a radial direction from the weight portion, and a hollow space surrounded by the weight portion and the cover portion. Further, a space for discharging oil is provided between the balance weight and the rotor. By the structure, reduction in oil churn, and reduction in input of the compressor are realized, and the compressor with less power consumption is obtained.

A heat storage device that includes a first heat storage material and a second heat storage material, both of which accumulate heat by heat exchange with a heat afferent medium, and a changeover device that selectively either performs or intercepts heat storage by the second heat storage material. Accordingly, if the absorption of heat by the first heat storage material has decreased, the changeover device changes flow of the second heat storage material so that heat may be extracted from the heat afferent medium by the second heat storage medium. Thus, when the heat afferent medium is a refrigerant, it is possible to supercool the refrigerant thereof. Furthermore, since heat is extracted from the heat afferent medium and is accumulated, accordingly it is possible to anticipate effective utilization thereof.

A solid oxide fuel cell system includes a solid oxide fuel cell that produces electricity by using a hydrogen-containing gas and an oxidant gas, an exhaust-gas path via which an exhaust gas discharged from the solid oxide fuel cell flows, a circulation path via which a coolant circulates, a first heat exchanger that is disposed on the exhaust-gas path and the circulation path and enables heat exchange between the exhaust gas and the coolant, a second path, via which condensed water produced when the exhaust gas is cooled in the first heat exchanger flows, that branches from the exhaust-gas path and is connected to the circulation path, a second tank that stores reservoir water, and a second heat exchanger that is disposed in the second tank and on the circulation path and enables heat exchange between the reservoir water and the coolant.

A heat storage device that includes a first heat storage material and a second heat storage material, both of which accumulate heat by heat exchange with a heat afferent medium, and a changeover device that selectively either performs or intercepts heat storage by the second heat storage material. Accordingly, if the absorption of heat by the first heat storage material has decreased, the changeover device changes flow of the second heat storage material so that heat may be extracted from the heat afferent medium by the second heat storage medium. Thus, when the heat afferent medium is a refrigerant, it is possible to supercool the refrigerant thereof. Furthermore, since heat is extracted from the heat afferent medium and is accumulated, accordingly it is possible to anticipate effective utilization thereof.

A heat dissipation device includes a heat pipe having a condenser section and a layer of solid-state solder film on an exterior surface of the condenser section, a heat sink having a plurality of spaced fins, each of which has an aperture. The condenser section of the heat pipe fits into the apertures of the fins. The heat sink with the condensing section received therein is heated and the solid-state solder film melts, filling gaps between the heat pipe and the fins. A method of assembling the device is also provided.

The invention relates to the field of portable houses, in particular to a novel house building structure. According to the technical scheme, the novel house building structure is characterized in thatthe novel house building structure comprises a base, wall bodies detachably connected to the base and a roof detachably connected to the tops of the wall bodies; an indoor space is defined by the base, the wall bodies and the roof, heat insulation layers are arranged on the sides, close to the indoor space, of the wall bodies, and first heat dissipation channels are formed in the sides, close tooutdoor space, of the wall bodies; the first heat dissipation channels are vertically arranged in the height direction of the wall bodies, first air inlets communicated with the bottom ends of the first heat dissipation channels are formed in the bottoms of the wall bodies, first air outlets communicated with the top ends of the first heat dissipation channels are formed in the tops of the wall bodies, a heat insulation cavity is formed in the roof, and the first air outlets are communicated with the heat insulation cavity; and a second air outlet communicating with the heat insulation cavityis formed in top of roof. The novel house building structure has the advantages that the heat insulation and heat preservation effects of the portable houses are improved, then the energy consumptionof indoor refrigeration electric appliances is reduced, and the novel house building structure is energy-saving and environment-friendly.

In an evaporator 1, space between two heat transfer plates 2 opposite to each other serves as a liquid path 3, and the outsides of the heat transfer plates 2 serve as a gas path 4. At the lower end of the liquid path 3, a liquid inlet, through which liquid to be evaporated is supplied to the evaporator 1, is provided, and at the upper end of the liquid path 3, a vapor outlet is provided. The liquid to be evaporated vaporizes while flowing from bottom to top. The heating gas is supplied form a gas inlet 7, which is provided at the upper end of the evaporator, and discharged from a gas outlet 8, which is provided at the lower end of the evaporator. Size of space S of the liquid path 3 gradually increases from bottom to top in a gas-liquid two phase region 11.

In a refrigerant evaporator, a core has tubes that are arranged in a core width direction and at least in two rows including a first row and a second row. The first row is disposed downstream of the second row with respect to a flow direction of an external fluid. The tubes of the first row provide a refrigerant upward path and a refrigerant downward path. The core has a thickness equal to or less than 50 mm with respect to the flow direction of the external fluid, and a width equal to or greater than 220 mm with respect to the core width direction. The upward path is further than the downward path with respect to a refrigerant inlet disposed at an end of a first header tank, and has a width equal to or less than 95 mm with respect to the core width direction.

A plurality of heat-exchange tubes 30 each including a flat pipe including a groove 36 and wavelike depression-and-projection portions 33, 34 are arranged in parallel in such a manner that each of respective longitudinal directions thereof is a vertical direction, and a heat exchange medium is made to flow from an inlet 31 at each lower portion to an outlet 32 at each upper portion. Guide walls 43, 44 are provided in a shell 40, and exhaust gas is made to flow an inlet 41 at an upper portion to an outlet 42 at a lower portion, thereby making the exhaust gas meander in flow paths 46a to 46d and a space between the plurality of heat-exchange tubes 30. The exhaust gas and the heat exchange medium have flows opposed to each other as a whole, and a secondary flow of the exhaust gas is made to occur by the wavelike depression-and-projection portions 33, 34, thereby enhancing the heat exchange efficiency, and the arrangement in such a manner that each of the longitudinal directions is the vertical direction and the formation of a groove 36 and the wavelike depression-and-projection portions 33, 34 enable acceleration of downward discharge of condensed water.

The invention relates to a manufacture method of flat heat exchange tube, which is provided with aluminum sheet materials rolled by rolling machine that is composed of central working roller and a plurality of working rollers, a parallel annular groove is formed on circumference surface of the central working roller, and then flat parts of lower wall are formed by the rolling machine, moreover the flat parts convexly form upright parts on left and right side walls and protrusion bars on reinforcing wall, the other aluminum plate is arranged on full protrusion bars to form an upper wall, moreover the aluminum plate is jointed with the two upright parts so as to make the two upright parts form left and right side walls, so that all protrusion bars are jointed with the upper wall to form the reinforcing wall.

Provided is a heat exchanger in which drainage performance of a tube and a fin is improved while preventing reduction in heat exchange efficiency. The heat exchanger includes: a tube having flat surfaces opposed to each other at a predetermined interval; and a fin including a bent portion and a flat portion which are alternately formed in a longitudinal direction, the bent portion being joined to the opposing flat surfaces of the tube. The fin has a predetermined lateral range (bent portion) in the bent portion which is brought into contact with one of the opposing flat surfaces, the predetermined lateral range being bent toward another of the opposing flat surfaces and joined to the another of the opposing flat surfaces, thereby forming a communication path.

A heat exchanger includes first and second headers; a plurality of tubes each defining two ends connected to the first and second headers respectively. Each tube includes a bent segment and straight segments connected to first and second ends of the bent segment respectively, the bent segment being twisted relative to the straight segments. A plurality of fins are interposed between adjacent straight segments. A length of the bent segment before bending satisfies a formula: 5tπ(180−θ) / 180+2Tw≦A≦30tπ(180−θ) / 180+8Tw, where: A is the length of the bent segment before bending, t is a wall thickness of the tube, Tw is a width of the tube, θ is an intersection angle between the straight segments of the tube, and π is circumference ratio. The heat exchanger of embodiments of the present invention is easy to bend and convenient to manufacture without reducing the heat exchange efficiency.

The invention discloses a low-temperature ablation catheter, a low-temperature ablation operating device and a low-temperature ablation device, and belongs to the technical field of the low-temperature ablation. The low-temperature ablation catheter comprises a first capsule, a core pipe and a thermal-insulating part. The first capsule is installed at the front end of the core pipe. The first capsule is provided with a front end area suitable for attaching a cardiac muscle tissue in a low-temperature ablation process and a rear end area exposed in blood. The core pipe is internally provided with a first loop. The first loop is suitable for charging low-temperature first fluid into the first capsule or flowing out the low-temperature first fluid. The thermal-insulating part is at least partially attached with the rear end area, and is suitable for reducing the heat exchange efficiency between the first fluid and the blood in atriums. The provided technical scheme is capable of effectively reducing the heat exchange between the low-temperature ablation catheter and the blood in the low-temperature ablation process.

To provide air-conditioning system which can air-condition a room with low electric power regardless of day or night by cooling outside air by using natural energy and efficiently storing the coldness in a thermal storage material while cooling the room with the cooled outside air and whose construction cost is low. Air-conditioning system utilizing natural energy is characterized by comprising a thermal storage chamber (27) formed under the floor; an intake air storage section (4) provided adjacently to the thermal storage chamber (27); an intake pipe (5) connected to the intake air storage section (4) and adapted for sucking outside air; an outside air cooling mechanism for cooling the outside air sucked through the intake pipe by using natural energy; an outside air supply pipe (7) for introducing the outside air cooled by the outside air cooling mechanism into the thermal storage chamber (27); a blower (8) for feeding the outside air cooled by the outside air cooling mechanism into the outside air supply pipe (7); and thermal storage material (6) housed in the thermal storage chamber and adapted for storing or releasing the coldness, and characterized in that the average particle diameter of the thermal storage material (6) is largeras the depth from a bottom surface (7a) of the thermal storage chamber (27) to a floor surface (20) is greater.

An object is to provide a vehicle air conditioner that has increased heating ability and reduced noise by improving the heat-exchange efficiency of a heater core by improving an air inlet channel of the heater core and that suppresses stagnation and separation of an air flow at the air inlet channel. Provided is an air-mixing damper type vehicle air conditioner (1) including an air-mixing damper (6), wherein a heater-core inlet channel sidewall (2A) of a casing (2) from a sealing portion (11) of the casing (2) to an edge of a heater core (5) is an inclined surface (30), the sealing portion (11) being contacted by a tip portion (6C) of the air-mixing damper (6) when the inlet of a heating-side air channel (13) is completely closed, and wherein the inclined surface (30) is formed as a curved surface protruding toward the inlet channel of the heater core (5).

An air conditioner according to the present invention prevents freezing of an outdoor heat exchanger in heating operation. A refrigeration cycle is formed by sequentially connecting a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a pressure reducing device 4, and an outdoor heat exchanger 5. In the refrigeration cycle, a high-temperature and high-pressure refrigerant compressed by the compressor 1 flows through a receiver tank 6 before supplied for indoor heating. The receiver tank 6 is placed in the outdoor heat exchanger 5, and thus heat from the receiver tank 6 through which the high-temperature and high-pressure refrigerant flows can be used to prevent freezing of a fin or a tube 10 in the outdoor heat exchanger 5, thereby ensuring heating performance.

The invention relates to the field of energy conservation and environment protection, in particular to an energy-efficient desulfurization and denitrification dust removal system. The system comprises a cyclone dust collector containing a combustor, an SNCR mechanism, a middle-high temperature cyclone dust collector, an SCR reactor, a desulfurization mechanism and a wet-type electrical cyclone dust collector which are connected in sequence; the desulfurization mechanism comprises a desulfurization gas flue and an absorption tower, wherein the desulfurization gas flue is internally provided with a spraying system and the absorption tower is arranged at the end of the desulfurization gas flue. By using the scheme, energy can be effectively saved.

In a revolution type compressor using a balance weight for balancing a rotating mass, the effect of oil churn reduction is enhanced, and compressor input is reduced. A balance weight fixed to a drive shaft between a rotor of an electric motor 4 and a compression mechanism includes a weight portion in a substantially semicircular column shape for balancing a rotating mass, a cover portion which is substantially semi-cylindrical and has an opening in the vicinity of a top and bottom at an opposite side in a radial direction from the weight portion, and a hollow space surrounded by the weight portion and the cover portion. Further, a space for discharging oil is provided between the balance weight and the rotor. By the structure, reduction in oil churn, and reduction in input of the compressor are realized, and the compressor with less power consumption is obtained.

Sludge can be effectively heat-treated with neither the drop of heat-treatment efficiency due to the adhesion of a sludge component to a heat transfer face nor the clogging of a passage with the sludge. The sludge is subjected to a heat-treatment by heating it by a reactor (14) under a predetermined pressure. Before this heat-treatment by the reactor (14), the sludge is preheated by a preheating device (13). This preheating device (13) is constituted by integrating a direct heat exchanger portion (15) connected to a feed passage of the sludge to the reactor (14) and an evaporator portion (16) connected to a discharge passage of the heat-treated sludge from the reactor (14). These portions are held therein at a pressure lower than that in the reactor (14). The sludge, which is introduced into the direct heat exchanger portion (15) but before heat-treated, is preheated by making direct contact with the steam which is produced from the heat-treated sludge introduced from the discharge passage into the evaporator portion (16).

The invention discloses a system and a method for desalting seawater through absorbing solar energy via a liquid-solid fluidized bed, belonging to the field of solar-powered seawater desalination technologies. The system comprises a solar spotlighting device, the liquid-solid fluidized bed, a pump, a compressor, a preheater, a filter, a gas-liquid separator and a liquid storage tank, wherein the solar spotlighting device is used for and directly irradiating the sunlight into the liquid-solid fluidized bed after focusing the sunlight, absorbing the solar thermal radiation by utilizing solid particles and heating the seawater in the liquid-solid fluidized bed; after being compressed, the pressure and the temperature of the water vapor generated in the liquid-solid fluidized bed rise, and the water vapor enters into the preheater to preheat the seawater which is about to enter into the liquid-solid fluidized bed; and after condensation, fresh water is obtained. The system provided by the invention is operated at normal pressure; and according to the system, the solar thermal radiation is absorbed by utilizing the solid particles with high absorptivity in the liquid-solid fluidized bed, and the evaporation efficiency of the seawater is improved at the same time by utilizing the efficient heat exchange between the liquid and the solid in the liquid-solid fluidized bed.

The invention provides a wastewater zero-discharge system for multi-stage treatment and a method of the system. The system comprises a boiler, a denitration system, a dry flue gas system, a desulfurization system, a wastewater conveying system, a wastewater concentration system, a wastewater spray evaporation system and a concentrated flue gas system, wherein the boiler, the denitration system, the dry flue gas system, the desulfurization system, the wastewater conveying system, the wastewater concentration system and the wastewater spray evaporation system are sequentially connected with oneanother; the wastewater concentration system is connected with the desulfurization system through the concentrated flue gas system; and the wastewater spray evaporation system is also connected with the dry flue gas system. According to the wastewater zero-discharge process for multi-stage treatment, secondary utilization of system waste heat is realized, operation energy consumption is reduced, and thus high-efficiency and stable zero discharge of desulfurization wastewater is realized.

The invention relates to the field of metal heat treatment and particularly discloses a heat treatment method for a tool. Quenching and tempering are performed by using a tool heat treatment device. The tool heat treatment device comprises a heating box, a quick-cooling mechanism and a vacuum machine. An opening is formed in the bottom of the heating box. The quick-cooling mechanism comprises a quick-cooling box, liquid nitrogen sources and a tool table only capable of sliding up and down in the quick-cooling box. A rotary disc rotationally connected with the quick-cooling box is arranged on the lower portion of the quick-cooling box. Paddles are fixedly arranged on the circumference of the rotary disc. A pull rod connected with the rotary disc in a threaded manner is fixedly arranged at the bottom of the tool table. The periphery of the quick-cooling box is sleeved with a venturi tube. Air inlets communicating with diffusion sections are formed in the bottom of the heating box. The paddles are arranged in corresponding inlet sections. A valve is arranged at each air inlet. Liquid nitrogen channels are arranged on the side wall of the quick-cooling box. The two ends of each liquidnitrogen channel correspondingly communicate with the corresponding liquid nitrogen source and a throat channel. After the valves are opened, the air flow can suck liquid nitrogen through the liquid nitrogen channels to quickly cool the quick-cooling box; and meanwhile the air flow drives the paddles to rotate, and the tool table quickly slides to the quick-cooling box to quickly cool the tool.

An upper heat exchange region (51) is divided into a plurality of main heat exchange parts (51a-51c), and a lower heat exchange region (52) is divided into a plurality of auxiliary heat exchange parts (52a-52c). A first header collecting pipe (60) is divided into an upper space (61) corresponding to the upper heat exchange region (51) and a lower space (62) corresponding to the lower heat exchange region (52). The lower space (62) is divided into a plurality of communication spaces (62a-62c) corresponding respectively to the auxiliary heat exchange parts (52a-52c). A second header collecting pipe (70) is divided into a communication space (71c) corresponding to both of the lowermost main heat exchange part (51a) of the upper heat exchange region (51) and the uppermost auxiliary heat exchange part (52c) of the lower heat exchange region (52), and into communication spaces (71 a, 71b, 71d, 71e) corresponding respectively to the other main heat exchange parts (51b, 51c) and the other auxiliary heat exchange parts (52a, 52b). Each of pairs of communication space (71 a, 71b) and communication space (71d, 71e) is connected to an associated one of communication pipes (72, 73).

A clothes dryer according to the present invention includes: a housing (11); a drum which holds clothes to be dried; a hot air generator (13) which generates hot air to be sent into the drum; an air blower (14) which is disposed at a front lower portion within the housing (11) and which draws ambient air into the housing (11); an ambient air inlet (26) provided in a bottom (11a) of the housing (11) and in front of the air blower (14); and an opening (28) which is provided at the bottom (11a) of the housing (11) and which communicates with the air blower (14). Such a structure prevents entry of foreign objects from the front face of the housing (11) and ensures drawing of ambient air through the opening (28) even if the ambient air inlet (26) is blocked.

A double pipe includes an inner pipe through an interior of which low pressure gaseous cooling medium flows and an outer pipe having the inner pipe in its interior, the outer pipe being configured such that high-pressure liquid cooling medium flows between the inner pipe and the outer pipe, wherein the inner pipe has a plate member that extending in the longitudinal direction so as to partition the interior of the inner pipe into a plurality of chambers. The plate member has a helical shape along the longitudinal direction.

An Air Handling Unit for a ventilation system in a building has supply and extract air channels, each with an inlet and an outlet for guiding air to and from a building. Each air channel includes a damper controlling air flow. The air channels are in a heat exchanging relation to each other. The AHU also includes a fan and an Electronic Control Unit. The ECU outputs a defrost cycle initiation signal to defrost the heat recovery arrangement. The ECU outputs a defrost cycle termination signal to end the defrost cycle upon indication of the defrosting being completed. To optimize the defrost cycle time the ECU changes the first or second criterion for defrost cycle termination signal depending on the time for performing the defrost cycle such that the time period of the defrost cycle is prolonged / shortened when the defrost cycle time period is shorter / longer than preferred.