A manufacturing method and structure of heat pipe with adjustable working temperature range are provided. The heat pipe includes a tube, a capillary structure and a working liquid. The tube includes a passage having a length direction and a diameter direction. Besides, a part of the tube has a pressed deformation zone in the pipe diameter direction, and the pressed cross-sectional area of the deformation zone in the diameter direction is reduced by a reduction ratio with respect to an original cross-sectional area before pressing, so that the deformation zone has a higher fluid resistance. Thereby, the heat pipe can be operated under a certain working temperature range, and the working object can achieve the working efficiency.

A manufacturing method and structure of heat pipe with adjustable working temperature range are provided. The heat pipe includes a tube, a capillary structure and a working liquid. The tube includes a passage having a length direction and a diameter direction. Besides, a part of the tube has a pressed deformation zone in the pipe diameter direction, and the pressed cross-sectional area of the deformation zone in the diameter direction is reduced by a reduction ratio with respect to an original cross-sectional area before pressing, so that the deformation zone has a higher fluid resistance. Thereby, the heat pipe can be operated under a certain working temperature range, and the working object can achieve the working efficiency.

Embodiments of apparatuses and methods are provided herein for characterizing a heat pipe, and for controlling an operating parameter of at least one heat generating component thermally coupled to the heat pipe based on a temperature difference measured across a first section and a second section of the heat pipe. For example, a characterization method is provided for determining at least one threshold value, which can be used to predict heat pipe dry-out within the heat pipe, and a thermal time constant (time lag) between the onset of heat pipe dry-out and a heat pipe dry-out limit. During subsequent system operation, the predetermined threshold value and thermal time constant may be used to extend the performance of the heat pipe to the edge of its cooling capacity.

The present disclosure provides a heat transfer limit experimental device of a high-temperature heat pipe equipped with a convenient temperature measurement box and a method based on the heat transfer limit experimental device. The heat transfer limit experimental device includes a high-temperature heat pipe, an electric heating system, a convenient temperature measurement box, a control system, a gas-cooled heat exchange system, and a data acquisition system. The electric heating system is connected to the high-temperature heat pipe. The convenient temperature measurement box is connected to the gas-cooled heat exchange system. The data acquisition system is connected to the gas-cooled heat exchange system, the convenient temperature measurement box, and the electric heating system. The control system is connected to the gas-cooled heat exchange system, the convenient temperature measurement box, and the electric heating system. The high-temperature heat pipe is disposed inside the convenient temperature measurement box.

An optical fiber temperature sensor includes: a substrate having a first substrate main body, and a second substrate main body, which has a coefficient of thermal expansion larger than that of the first substrate main body, and is bonded to the first substrate main body; and an optical fiber having a FBG sensor portion for measuring a temperature from a relationship between a Bragg wavelength and the temperature, and the optical fiber is configured to be embedded in the second substrate main body so that the FBG sensor portion is positioned in the second substrate main body.

The invention relates to a method for detecting deficiencies in a cooling tower (2) of a thermal facility (1) in operation in a given environment, comprising the implementation of the steps of: (a) measurement, by a plurality of sensors (13), of a set of values of physical parameters relating to the cooling tower (2), at least one of which being an endogenous parameter specific to the operation of the cooling tower (2) and at least one exogenous parameter specific to said environment; (b) calculation, by data processing means (11), of at least one expected optimum value of said endogenous parameter as a function of said values of the physical parameters and a model; (c) determination, by the data processing means (11), of at least one potentially deficient function of the cooling tower (2) as a function of the disparity between the measured value and the expected optimum value of said endogenous parameter and/or the variation of said disparity; (d) testing, by the data processing means (11), of each function of the cooling tower (2) determined as being potentially deficient; and (e) triggering of an alarm, by the data processing means (11), if at least one function of the cooling tower (2) is evaluated as being deficient in the test.

An apparatus is provided for detecting the quality of a heat pipe. The apparatus has an infrared (IR) thermal imager bound with a data computing-and-analyzing program to detect thermal conductivity quality and vacuum quality of the heat pipe. An online overall detection is thus provided to quickly detect the quality of the heat pipe without damage for efficient quality control. Requirements of quality detection are met for mass production of heat pipes. The apparatus comprises the heat pipe to be tested; a tape adhered to a surface of the heat pipe; a fixed base for disposing the heat pipe; a heating device in an allocation space of the fixed base; the IR thermal imager located facing to the tape; a signal line connected to the IR thermal imager; and an electronic device connected to the IR thermal imager through the signal line.

The present invention is a system and method for determining effective ground thermal properties. Accurate prediction of required loop length for geothermal heat exchange systems is critical for optimizing performance and associated cost, yet limited by lack of knowledge of the effective average thermal properties of the surrounding ground. Testing involves first charging the ground loop by circulating fluid at constant temperature and constant rate of heat input, then halting heat input and monitoring the ground loop temperatures during discharge. One aspect of the invention is to enable separate determination of effective ground thermal conductivity and volumetric heat capacity first by adopting design elements resulting in improved reproducibility, and second by evaluating thermal conductivity near the time when the quotient Q of later discharge temperature to start-of-discharge fluid temperature is almost independent of volumetric heat capacity. Evaluation discharge times are specific to both ground loop design and charging conditions.

An optical fiber temperature sensor includes: a substrate having a first substrate main body, and a second substrate main body, which has a coefficient of thermal expansion larger than that of the first substrate main body, and is bonded to the first substrate main body; and an optical fiber having a FBG sensor portion for measuring a temperature from a relationship between a Bragg wavelength and the temperature, and the optical fiber is configured to be embedded in the second substrate main body so that the FBG sensor portion is positioned in the second substrate main body.

Embodiments of apparatuses and methods are provided herein for characterizing a heat pipe, and for controlling an operating parameter of at least one heat generating component thermally coupled to the heat pipe based on a temperature difference measured across a first section and a second section of the heat pipe. For example, a characterization method is provided for determining at least one threshold value, which can be used to predict heat pipe dry-out within the heat pipe, and a thermal time constant (time lag) between the onset of heat pipe dry-out and a heat pipe dry-out limit. During subsequent system operation, the predetermined threshold value and thermal time constant may be used to extend the performance of the heat pipe to the edge of its cooling capacity.