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Umezawa S.,Tokyo Electric Power Company | Shimada H.,Tokyo Electric Power Company | Sakurai K.,Takaoka Electrical Manufacturing Co. | Miyamoto J.,Mitsubishi Group | And 2 more authors.
International Conference on Power Engineering 2013, ICOPE 2013 | Year: 2013

We developed a centrifugal heat pump system to produce high-temperature water for an industrial process in an actual factory. The heat pump uses a state-of-the-art centrifugal compressor, which results in high efficiency and large heat output. It uses HFC-134a as the refrigerant, and is operated stably and efficiently by a new control technique corresponding to the HFC-134a supercritical cycle. The heat pump generates high-temperature water using the factory's exhaust heat as the low-temperature heat source. Exhaust gases from drying furnaces and an annealing furnace were used as low-temperature heat sources. A thermal storage tank was prepared for these sources, and for adjusting the time difference between the heat demands of the drying system and low-temperature heat source. The result showed that the heat pump system can satisfy drying systems' heat demand while retaining high efficiency. Moreover, this system exhibits CO2 emissions and primary energy consumption than the traditional boiler system. Source


Umezawa S.,Tokyo Electric Power Company | Amari H.,Tokyo Electric Power Company | Shimada H.,Tokyo Electric Power Company | Matsuhisa T.,Takaoka Electrical Manufacturing Co. | And 2 more authors.
American Society of Mechanical Engineers, Power Division (Publication) POWER | Year: 2011

This paper reports application study of newly developed turbo heat pump for 130 degrees Celsius (°C) water for an industrial process in an actual factory. The heat pump is characterized by high efficiency and large heat output, by using a state-of-the-art turbo compressor. The heat pump requires a low temperature heat source in order to achieve high efficiency. The heat demand is for several drying furnaces in the factory, which requires producing hot air of 120 °C. The heat exchanger was designed to produce the hot air. Experiments were conducted to confirm the performance of the heat exchanger under a reduced size of the heat exchanger. Low temperature heat sources are from both exhaust gas of the drying furnaces and that of an annealing furnace. The heat exchangers were also designed to recover heat of the exhaust gas from the two types of furnace. A thermal storage tank was prepared for the low temperature heat source, and for adjusting the time difference between the heat demand and the low temperature heat source. The size of the tank was determined by considering the schedule of furnaces operations. As a result of the present study, it was confirmed that the heat pump was able to satisfy the present heat demand while retaining high efficiency. Primary energy consumption and CO 2 emission of the heat pump were calculated on the basis of the present results in order to compare them with those of the boilers. Copyright © 2011 by ASME. Source


Patent
TAKAOKA Electrical Manufacturing CO. | Date: 2012-09-11

According to one embodiment, a focus position changing apparatus is provided on an optical path of a confocal optical apparatus having a light source and an objective lens and is configured to change a focus position of the objective lens in an optical axis direction of the objective lens. The focus position changing apparatus includes at least a plurality of optical path changing pieces and a rotating plate. Each of the plurality of optical path changing pieces is differ from each other in at least one of a refractive index and a thickness. On the rotating plate, the plurality of optical path changing pieces is arranged along a rotation direction of the rotating plate so as to cross an optical axis of the objective lens. And an anti-reflection layer is formed in a predetermined region on a surface of the rotating plate on a side of the light source.


Patent
TAKAOKA Electrical Manufacturing CO. | Date: 2012-09-11

According to one embodiment, a three-dimensional shape measuring apparatus includes at least an aperture plate that is provided with a plurality of confocal apertures which are two-dimensionally arranged to have a predetermined arrangement period, and an aperture plate displacement portion that displaces the aperture plate at a constant speed in a predetermined direction perpendicular to the optical axis direction. Further, the aperture plate is provided with a cover member which is moved integrally with the aperture plate and which includes a transparent body allowing the light beams from the light source to pass therethrough and to be irradiated to the plurality of confocal apertures, and protects the plurality of confocal apertures from dust. Further, an imaging optical system, by which each of reflected light beams is guided to a photo-detector, is designed in consideration of optical properties of the whole optical system including the transparent body of the cover member.


Nagamoto T.,Takaoka Electrical Manufacturing Co. | Takayama K.,Takaoka Electrical Manufacturing Co. | Kai T.,National Institute of Technology,Oyama College
IEEJ Transactions on Power and Energy | Year: 2010

The variable speed drives of the power electronics application are the most sensitive to the voltage dip that is caused by power system fault. Variable speed drives are composed by the converter, the voltage source inverter and induction motor. They could fall into operation failure by wrong control in the converter when degree of the voltage dip exceeds 15% and 10 ms. Therefore, important loads are equipped with the voltage dip compensation. Since the load characteristic of the converter equals nearly the impedance load, the induction motors connected directly to power supply are more sensitive to the output voltage waveform of the compensator than the converter. Thus, the induction motors are used as the important load (compensated load) on the simulation. The simulations of the compensation performance to the induction motors are carried out by using simulation tool PSCAD/EMTDC. It is confirmed that the goal of the compensation performance is able to be achieved. © 2010 The Institute of Electrical Engineers of Japan. Source

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