Olson E.R.,Tyco Thermal Controls |
Lorenz R.D.,University of Wisconsin - Madison
IEEE Transactions on Industry Applications | Year: 2010
A methodology for decoupling cross-coupled fields in compact current-sensor designs is presented. The compactness of the current sensor is made possible by using highly sensitive field detectors, such as giant magnetoresistive (GMR) technology, which offers galvanic isolation, small size (∼mm2), and high bandwidth (> 1 MHz). By using known geometric relations between the conductor geometries and locations of the field detectors, cross-coupled magnetic-field signals can be used to extract necessary current signals, as well as separate unknown disturbance fields. This methodology can also be used to simplify the magnetic biasing required of GMR field detectors, including decoupling of the temperature dependence of the biasing magnet. Moreover, the methodology can also be extended to estimate the temperature of the magnet to provide an extra temperature signal for thermal management algorithms. © 2010 IEEE.
Liu N.,Tyco Thermal Controls
ASME 2012 Heat Transfer Summer Conf. Collocated with the ASME 2012 Fluids Engineering Div. Summer Meeting and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels and Minichannels, HT 2012 | Year: 2012
Heating cables inserted in metal conduit that is embedded in concrete are used in frost heave prevention of liquefied natural gas storage tanks (LNG tanks). The subfreezing temperature of the tank can cause the soil below and around it to freeze. This phenomenon causes heaving of the soil and damage to the foundation of the tank. This study investigates both the worst heat transfer scenario, where the heating cable is positioned in the center of and not in direct contact with the conduit, and the best heat transfer scenario, where cable is positioned on the bottom of and in direct contact with the conduit, for the purpose of preventing frost heave of the tank. Experiments are carried out to evaluate the cable power output and sheath temperature under a variety of conduit temperatures and applied voltages. A coupled thermal-electric-fluids numerical model is developed as well in Ansys-CFX to predict the cable power output and its temperature distribution. The numerical model is calibrated and the predicted cable power output and cable sheath temperature are compared with the experimental data. The numerical predictions demonstrated good agreement with experimental data. The heat transfer mechanism between cable and conduit involves thermal conduction, convection and radiation. Copyright © 2012 by ASME.
Liu N.,Tyco Thermal Controls
Proceedings of 2011 International Conference on Modelling, Identification and Control, ICMIC 2011 | Year: 2011
Self-regulating polymer heating cables are widely used in industry and the commercial world. Their applications include process temperature maintenance, frost heave protection, floor heating, and snow-melting. The heating cables automatically adjust their power output to compensate for temperature changes. This paper demonstrates a numerical approach based on a 3D finite element model to evaluate the cable performance in a concrete slab for snow-melting applications. A variety of thermal conditions are investigated to simulate the ambient temperature changes. Experiments were carried out to validate the finite element model. The numerical results and experimental data are compared and presented. © 2011 Shanghai Jiaotong Univ.
Tyco Thermal Controls | Date: 2011-02-16
Techniques for leak detection are described. A leak detection module may include a plurality of wires comprising one or more collection points. The leak detection module may further include a capacitor configured to store a charge for powering the module during a power-off state and a plurality of switches to be controlled by a processor. The processor may initiate a predetermined switching sequence when a power-off state has been detected. During the switching sequence, leak detection data may be collected at the one or more collection points. The collected leak detection data may be stored in a set of registers. The leak detection module may transmit the stored leak detection data. Other embodiments are described and claimed.
Tyco Thermal Controls | Date: 2012-04-02
A method and apparatus is disclosed for correlating signals generated by a sensor with a position of a plurality of rotating blades to determine turbine blade tip clearance and measurements. The sensor may be positioned in the housing of a turbine, and may be used to determine a radial clearance between the tips of a plurality of rotating turbine blades and a housing during turbine testing and/or operation. A method for using a plurality of sensors separated by a known distance is also disclosed. Other embodiments are disclosed and claimed.
Tyco Thermal Controls | Date: 2011-09-15
A fluid pipeline has a first end and a second end. An elongated heat trace element is aligned and coupled to at least a portion of an outer surface of the fluid pipeline. The outer surface of fluid pipeline carries a first insulation material, wherein the first insulation covers a first portion of the outer surface. The outer surface of fluid pipeline further carries a second insulation material, wherein the second insulation covers a second portion of the outer surface and wherein the second portion of the outer surface is different than the first portion of the outer surface. The first and second insulation materials are configured to cover the outer surface of the fluid pipeline. The fluid pipeline further comprises a third insulation material carried over a second outer surface defined by the cooperation of the first and second insulation materials.
Electrical hard-wired connection kit for heating cables comprising metal grounding screws and nuts, non-metal pipe mounting brackets, metal lock nuts, non-metal grommets, metal and non-metal wire nuts, non-metal heat-shrinkable tubes, non-metal end seals, metal ring terminals, non-metal sealing gaskets and plastic labels. In-line splice kit for heating cables comprising manually operated wire crimps, manually operated braid crimps, non-metal clamp ties, non-metal cable ties, non-metal heat-shrinkable caps and tubes, non-metal end seals, cloth tape, and non-metal mastic strips; splice and tee kits for heat trace cable comprising manually operated wire crimps, manually operated braid crimps, non-metal clamp ties, non-metal cable ties, non-metal heat-shrinkable caps and tubes, non-metal end seals, cloth adhesive tape, and non-metal mastic strips. Plug in power connection kit for heating cables comprising plug-in ground fault equipment protection device, manually operated braid crimp, manually operated wire crimps, non-metal heat shrinkable tubes, nonmetal clamp ties, plastic labels, cloth adhesive tapes, non-metal mastic strips, and non-metal end seals. Parts of heating systems, namely, self-regulating crankcase heater for use in connection with compressors for air conditioners, heat pumps, and air chillers and refrigeration systems. Heat shrinkable end caps of plastic for cables; Heat shrinkable and preformed plastic end seals for heating cable; Plastic labels for identifying heat tracing locations; non-metal end seals for heating cables.
Tyco Thermal Controls | Date: 2013-01-29
Distance and vibration sensor system comprising sensors, electronics, computer hardware and software.
Tyco Thermal Controls | Date: 2012-10-15
A joint for fluid storage tank insulation systems. A central expansion joint forms a fluid-sealed recessed channel having a ridge-like cap. Water and moisture are directed away from the central expansion joint by the ridge-like cap. Any water that breaches the cap enters the recessed channel and flows out of the expansion joint without damaging tank insulation material. With installations having multiple expansion joints, at least one of the expansion joints can be equipped with an inverted cap to form a gutter within such expansion joint.
Tyco Thermal Controls | Date: 2013-04-10
A method and apparatus is disclosed for correlating signals generated by a sensor with a position of a plurality of rotating blades. The sensor may be positioned in the housing of a turbine, and may be used to determine a radial clearance between the tips of a plurality of rotating turbine blades during turbine testing and/or operation. The sensor can be calibrated to the rotating blades for a plurality of known axial positions, blade thicknesses and mechanically measured radial clearances between the blade tips and the housing. Characteristics of a blade passing signal generated by the sensor can be stored for a plurality of axial and radial positions of the rotatable blades. In later operation, the width of the blade passing signal and the speed of the rotating blades can be measured to determine a thickness of the rotatable blades, which can be correlated with an axial position of the rotating blades relative to the sensor. The determined axial position is then compared to the stored sensor calibration data to determine an accurate radial clearance between the rotating blades and the housing. A method for using a plurality of sensors separated by a known distance is also disclosed. The plurality of sensors are used to create a plurality of calibration curves correlating the output from the sensors to mechanically measured radial clearances between the sensors and the rotating blades. In operation, output from the sensors, along with the known distance between the sensors, is used to select one of the plurality of stored calibration curves in order to determine an accurate radial clearance between the rotating blades relative to the sensors. Other embodiments are disclosed and claimed.