Showing papers on "Gas heater published in 1991"
TL;DR: To assess risk factors associated with the contamination of the domestic environment by legionellae, 211 houses in the Quebec City area were randomly selected and water samples were collected from the hot water tank, the shower heads, and the most frequently used faucet.
Abstract: To assess risk factors associated with the contamination of the domestic environment by legionellae, 211 houses in the Quebec City area were randomly selected and water samples were collected from the hot water tank, the shower heads, and the most frequently used faucet. After centrifugation, concentrated samples were seeded in triplicate on BCYE and GPV media. Data on the characteristics of the hot water system and plumbing in the house and on the personal habits of the occupants were collected for each house. Among these 211 houses, hot water was provided by either an oil or gas heater in 33 and by an electric heater in 178. Legionellae were isolated from none of the samples from houses with oil or gas heaters and from 39% (69 of 178) of those with electric water heaters (P less than 0.0001). This association remained highly significant after control for water temperature and other variables in a stratified analysis. In the 178 houses with an electric heater, 12% of the faucets, 15% of the shower heads, and 37% of the water heaters were contaminated. Legionella pneumophila serogroups 2 and 4 were the most frequently isolated strains. Logistic regression showed that factors associated with electric water heater contamination were (i) location of the house in older districts of the city (P less than 0.0001), (ii) old age of the water heater (P = 0.003), and (iii) low water temperature (P = 0.05). Contamination of the water heater was the only factor significantly associated with the contamination of peripheral outlets (P less than 0.0001).(ABSTRACT TRUNCATED AT 250 WORDS)
123 citations
Patent•
08 Nov 1991
TL;DR: In this paper, a spray dryer with an annular guide duct and a gas burner is described, which is used to transfer a gas that has been heated at a location remote from the spray chamber to contact liquid droplets dispersed by the atomizer.
Abstract: A gas distributor and heating device for a spray dryer which includes a feed liquid atomizer in a drying chamber, a gas distributor for supplying a uniform flow of gas, a guide duct for conveying the flow of gas from the gas distributor and to an outlet providing a flow of processing or drying gas to contact liquid droplets dispersed by the atomizer. A gas heater is located in the device between the gas distributor and the guide duct outlet to heat the gas just prior to its introduction into the spray chamber. This provides a high temperature drying gas close to the atomizer and avoids problems encountered in attempting to transfer a gas that has been heated at a location remote from the spray chamber. A guide duct in the form of an annular guide duct provides an annular flow of heated gas concentric with the atomizer. A gas burner extends circumferentially around the interior of the guide duct and is disposed to emit the gases of combustion in the direction of the outlet. The guide duct may also include a plate shielding a portion of the gas flow from direct contact with the burner and the gases of combustion to provide an insulating flow of gas between the annular duct and the combustion zone.
30 citations
Patent•
31 May 1991
TL;DR: In this article, an apparatus and method for providing a hot water supply for a building such as a mobile home, house, or business is presented, where a gas-fueled burner is positioned outside the building adjacent a heat exchanger which is connected in fluid communication with the indoor water storage tank.
Abstract: An apparatus and method for providing a hot water supply for a building such as a mobile home, house, or business. A hot water storage tank is positioned within the building. A gas-fueled burner is positioned outside the building adjacent a heat exchanger which is connected in fluid communication with the indoor water storage tank. A pump circulates water from the tank through the heat exchanger and back into the tank responsive to a thermostat in the tank. The heat exchanger includes a thermostat for sensing the temperature of water therein to activate the pump and circulate relatively warm water from the tank through the heat exchanger to prevent freezing of water within the heat exchanger, such as during winter months when the ambient temperature falls below freezing. The gas heater may be used to convert a conventional electric water heater to operate from gas which is combusted outside of the building.
28 citations
Patent•
17 Apr 1991
TL;DR: In this paper, a screw compressor of a room temperature type as a compressor and a suction gas heater with cooled exhaust heat of the compressor its heat source are used to enable use of a screw-type screw compressor by using a screw compressors of a different type as compressor and by heating boil-off gas before it enters the compressor by a gas heater.
Abstract: PURPOSE:To enable use of a room temperature type screw compressor by using a screw compressor of a room temperature type as a compressor and by heating boil-off gas before it enters the compressor by a suction gas heater with cooled exhaust heat of the compressor its heat source. CONSTITUTION:Boil-off gas(BOG) generated in an LNG tank 11 is extracted to a line L3, and the extracted BOG at -150 deg.C to -130 deg.C is heated by a suction gas heater 12 to about -40 deg.C and then, sent to a screw compressor 13 as a room temperature type BOG compressor and pressurized to the supply pressure for a low pressure customer at this compressor 13. The compressor 13 is cooled by cooling water circulating in a cooling water line L4, and an outlet side part of the compressor 13 in this cooling water line L4 is introduced to the heater 12 as a heating medium heating source. Thus, equipment cost can be reduced and operation can be started faster by the amount of cool-down at startup which has been necessary in the case of an extreme low temperature compressor.
5 citations
Patent•
10 Apr 1991
TL;DR: In this paper, a noble metal catalyst was used to continue the regenerative action of a carbon dioxide gas laser device for a prolonged time by bringing CO and O2 and NOx in the mixed gas used for a laser device into contact with the catalyst at a temperature, where the degree of poisoning by NOx is reduced, and recirculating these gases to the laser device.
Abstract: PURPOSE:To continue the regenerative action of a noble metal catalyst, and to continue the regenerative throughput capacity of a mixed gas for a prolonged time by bringing CO and O2 and NOx in the mixed gas used for a laser device into contact with the catalyst at a temperature, where the degree of poisoning by NOx is reduced, and recirculating these gases to the laser device. CONSTITUTION:A mixed gas used for a carbon dioxide gas laser device 7 is heated at a temperature of 200-350 deg.C by a gas heater 3, and catalytically reacted with a noble metal catalyst in a reactor 4. The heat of reaction generated is utilized for preheating an unreacted mixed gas. The mixed gas after the reaction is cooled by a gas cooler 5 up to a temperature capable of being used for laser oscillation, passed through a filter 6 to prevent dust, and returned to the laser device 7 again. Consequently, since the mixed gas is cooled to a temperature, where the degree of the adsorption of NOx is lowered, the regenerative action of the catalyst can be continued for a prolonged time. When the activity of the catalyst is reduced, NOx adsorbed to the catalyst is decomposed by an He-CO-O2 mixed gas.
4 citations
Patent•
25 Sep 1991
TL;DR: In this article, the main and auxiliary burners are regulated proportionally from high to low, but a combustion amount of the auxiliary burner B is always kept at a specified value, and a stable electromotive force is produced independent of a fluctuation in the combustion amount.
Abstract: PURPOSE:To stabilize electromotive force, to improve the thermal efficiency of an auxiliary burner for a pan and the like, to simplify structure, and to improve facility by a method wherein a combustion amount of a main burner is regulatable proportionally from high to low, and a combustion amount of the auxiliary burner is always kept at a specified value. CONSTITUTION:A main burner A is so formed that a burner head 1 is integrally mounted on the tip part of a mixing pipe 5. An auxiliary burner B is so located that a position relation between the central part of the main burner A, i.e., the central part of a central air hole 3, and a pot or a pan C placed on a grate is an optimum position. A combustion amount of the main burner A is regulated proportionally from high to low, but a combustion amount of the auxiliary burner B is always kept at a specified value. Since a flame detecting element TC heated by the auxiliary burner B is always at a specified temperature, a stable electromotive force is produced independent of a fluctuation in a combustion amount of the main and auxiliary burners in a range of from a combustion maximum area being a maximum combustion amount to a fuel minimum are being a constant combustion amount of the auxiliary burner. Further, since the mounting position of the auxiliary burner B relative to the pot or pan C can be also set to an optimum position, the thermal efficiency of the auxiliary burner B is improved.
3 citations
Patent•
12 Apr 1991
TL;DR: In this article, a gas burner is placed on the lower side of a firebox, and a plurality of incandescent lamps are placed in the room side, with a partition wall between the burner and the lamps and a sheet of ground glass disposed at an upper position on the front side of the lamps.
Abstract: PURPOSE:To ensure that a heater such as a gas heater appears wavering similarly to a natural flame to make people feel comfortable as well as warm, by disposing an incandescent lamp for lighting, which is covered by ground glass on the face side, at an upper position on the front side of a burner, and forming a power supply for the lamp by superimposing a DC bias voltage on a 1/f fluctuation voltage. CONSTITUTION:A burner, e.g. a gas burner 3 is placed on the lower side in a firebox 5, and a plurality of incandescent lamps 2 are placed on the room side, with a partition wall 10 between the burner 3 and the lamps 2 and with a sheet of ground glass 11 disposed at an upper position on the front side of the lamps 2. A DC voltage is applied between both ends of solid carbon 14, and a minute fluctuating current with 1/f spectrum generated at the ends of the solid carbon 14 is passed through a capacitor 16 to extract the fluctuation as a 1/f fluctuation voltage 17. A power supply 19 for each of the lamps 2 is produced by superimposing the 1/f fluctuation voltage to a DC bias voltage. The lamps 2 are supplied individually with the 1/f fluctuation voltages, to show variations in illuminance, thereby producing an effect similar to a wavering flame of burning firewood, so that the people in the vicinity of the fireplace can peel comfortable and warm.
3 citations
Patent•
28 May 1991
TL;DR: In this article, the authors proposed a method to control the temperature of carrier gas to be supplied during annealing and cooling by providing a carrier gas heater and a cooling carrier gas supply passage.
Abstract: PURPOSE:To control temperature of carrier gas to be supplied during annealing and cooling by providing a carrier gas heater in an annealing carrier gas supply passage, and providing a cooler in a cooling carrier gas supply passage CONSTITUTION:Annealing carrier gas to be supplied from a gate carrier gas supply controller 20 through a pipe 52 is heated to a high temperature necessary for annealing by a heater 21, high temperature annealing carrier gas is formed in a laminar flow by a diffusing straightening unit 24, and fed to an annealing furnace body 26 The annealing carrier gas is fed along the surface of a wafer 29 to uniformly heat the surface of the wafer 29 to uniformly anneal it When the annealing is completed, the controller 20 stops supplying of the gas, and instead supplies cooling carrier gas through a pipe 53 The cooling gas is cooled by a cooler 22, formed in a laminar flaw by the unit 24, and fed into the body 26 The cooling gas is fed along the surface of the wafer 29 disposed in the body 26 to uniformly cool it
3 citations
Patent•
12 Jul 1991
TL;DR: In this paper, the authors proposed a method to remove water and enable drying by separating water which drips from a storage container by a solid-liquid separating material, and supplying heated inert gas after degassing in a drying container.
Abstract: PURPOSE:To easily remove water and enable drying by separating water which drips from a storage container by a solid-liquid separating material, and supplying heated inert gas after degassing in a drying container. CONSTITUTION:Water separated by gravitation from a fuel coating pipe W, etc., put in the storage container 5 in water which is stuck on the fuel cladding pipe W, etc., or contained in it passes through many pores (h) of a bottom plate 52 together with fine cutting powder of the coating pipe W, etc., and drips in a hopper 6. They are filtered by the solid-liquid separating material (f) and only the water flows in a water collection tank from a drain pipe 64. Then when the container 5 is stored in the drying container 1, the vacuum pump 23 of a degassing device 2 performs the degassing. Then the heated inert gas is supplied through a gas heater 31 and flows in through the fine pores (h) to pass in the cladding pipe W, etc., and the heat of a heater 12 is conducted even from outside the container 5.
2 citations
Patent•
14 Aug 1991
TL;DR: When the tap is turned on (A) cold water flows for a short time until a switch is actuated (B) to supply a pulse to the valve delivering the gas, then closes the water feed pipe for a safety interval until the gas valve is opened.
Abstract: When the tap is turned on (A) cold water flows for a short time until a switch is actuated (B) to supply a pulse to the valve delivering the gas. An additional switch, or electrical blocking of the same switch, then closes the water feed pipe for a safety interval until the gas valve is opened (C). The water supply is restored at that instant, or after a brief delay (D) allowing the heating to become effective. ADVANTAGE - With only small quantity taken for switching pulse, only hot water emerges from tap.
2 citations
Patent•
16 Jan 1991
TL;DR: In this article, the utility model discloses a gas burner for heating suitable for the heating of house in winter, which comprises a hot water radiator and a gas heater, and the bottom of the hot water radiator is provided with a gas stove and the upper part of the gas heater is connected with the heating discharge pipes.
Abstract: The utility model discloses a gas burner for warming suitable for the heating of house in winter, which comprises a hot water radiator. The gas burner for warming is characterized in that the bottom of the hot water radiator is provided with a gas heater, and the upper part of the gas heater is provided with the heating discharge pipes which are connected with the hot water radiator. The gas burner for warming provides a warmer with the heat source of natural gas or coal gas, has the advantages of convenient operation, low cost, low energy consumption, simple structure, no pollution of house, etc.
Patent•
06 Sep 1991
TL;DR: In this paper, a noncontact-type temperature sensor is used to detect the temperature of a flame extending to a position of detection of the temperature and a control circuit element takes in a detection signal of the noncontact type temperature sensor relating to a lateral-side temperature in the vicinity of the bottom part 16 of the cookpot.
Abstract: PURPOSE:To improve usability without discontinuance of cooking by storing a maximum temperature rise value at the outer surface of a vessel, by detecting a temperature rise value at each unit time and by cutting off a gas by judging a cooking state as abnormal when the temperature rise value exceeds the maximum temperature rise value and continues to exceed this value for a prescribed time CONSTITUTION:When cooking by heating is conducted with a cookpot 15 moved, a noncontact- type temperature sensor 13 detects the temperature of a flame extending to a position of detection of the temperature A control circuit element 19 takes in a detection signal of the noncontact-type temperature sensor 13 relating to a lateral-side temperature in the vicinity of the bottom part 16 of the cookpot 15, at each unit time, determining a temperature rise value (b) thereform and comparing the temperature rise value (b) with a maximum temperature rise value (a) on the lateral side in the vicinity of the bottom part 16 of the cookpot 15 which is set beforehand When the temperature rise value (b) exceeds the maximum temperature rise value (a), a flame of a gas burner 8 is judged to be detected When this judgement continues for a prescribed time, a control instruction on cutoff of supply of a gas is outputted Even when the bottom part 16 of the cookpot 15 is moved off temporarily from a holder 9 of a gas heater 1, the supply of the gas is not cut off immediately Therefore cooking is not discontinued and the heater is made excellent in usability
Patent•
14 Aug 1991
TL;DR: In this paper, a balance is set up to the volume of mixture gas to a main burner by communicating a gas passage 11 to a central burner 2 at one place from the side of the mixture gas passage 9 and the flame is formed uniformly.
Abstract: PURPOSE:To enable sufficient secondary air to be presented to central flame hole by arranging a gass passage for supplying fuel gas from a main burner to a central burner, the gas passage being biased to a section on the periphery of a secondary air passage. CONSTITUTION:A balance is set up to the volume of mixture gas to a main burner by communicating a gas passage 11 to a central burner 2 at one place from the side of the mixture gas passage 9 and the flame is formed uniformly. A secondary air passage 18 for assisting the mixture gas in its combustion at the central flame hole 17 of this central burner 2 is formed by the central space of the main burner, namely the inner space of the cylindrical section 10 of a burner head 4. The gas passage 11 for supplying the mixture gas to the central burner 2 is, therefore, arranged biased to one section of the periphery of the secondary air passage, and a sufficient volume of the secondary air is supplied to the central burner section 2 by making the area of passage for the air in the secondary air passage 11 as large as possible. A sufficient volume of the secondary air is thereby supplied to the central burner 2.
Patent•
08 May 1991
TL;DR: In this article, a curling tong heater with a temperature responsive element was used to regulate the flow of gas and entrained air to a catalytic burner, and the fuel flow was controlled indirectly by variable bleed through an opening 6g controlled by a bi-metallic element 15.
Abstract: A catalytic burner 10 for a low output heater such as curling tong heater or a soldering iron is supplied with a mixture of gas and entrained air through a duct 6c including a heater temperature responsive element 15 to regulate the flow of mixture to the burner. In the curling tong heater of Fig. 1 a flap 15 cooperates with an aperture 9a, a leakage aperture (15b) or path ensuring a minimum fuel flow. In Fig. 3 the fuel flow is controlled indirectly by a variable bleed through an opening 6g controlled by a bi-metallic element 15.