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About 10,000 papers for “Temperature control”

Temperature Control

Roberts, Timothy H · Opus: Research & Creativity (Indiana University – Purdue University Fort Wayne) · 1982

Cited by 0

Temperature control

Guy K White, Philip J Meeson · 2002

Abstract It is almost always the case in the course of experimentation at low temperatures that the experimenter not only wishes to know the temperature of the sample whose properties are to be measured but also wishes to achieve a particular sample temperature and wishes to hold that desired temperature for some useful length of time. The experimenter will also want to know that the required temperature has been obtained to within some specified accuracy for the duration of any particular measurement. Generally experiments need to be performed over a range of temperatures in order to determine, for instance, whether a sample has some particular power law or exponential dependence of its properties on temperature. Information such as this is often particularly revealing of the physics of the sample. For example, it may be possible to design an experiment to measure the thermal conductivity of some sample in which the absolute value of the thermal conductivity is not well determined because of some unknown factor, such as an irregularly shaped sample. Under such circumstances it is still possible to determine the temperature dependence of the thermal conductivity to a rather high degree of accuracy, because the unknown parameters are precisely constant and may be factored out. Conversely, it is important in such circumstances to make measurements over a sufficiently large range of temperature (given some finite indeterminacy or error bar in any one measurement at any one temperature) to ascertain any supposed power law with sufficient confidence. Finally, we do not wish to see any instability in the temperature being the major contributor to uncertainties or errors in the final value obtained from a measurement.

Cited by 1

Temperature control

Kutz, Myer · CERN Document Server (European Organization for Nuclear Research) · 1968

Cited by 5

Temperature Control

Dale F. Lott · 2002

Bison seldom if ever die of heat, but they often die of cold. The dark coat that makes the sun a nuisance in summer may be a lifesaver in winter. Bison evolved in really terrible winters; and even now, especially severe winters kill many of the old and the young. Every calorie of heat absorbed from the sun is a calorie the bison does not have to manufacture from the scarce forage. Bison cut their energy output by losing their appetite. They eat less and produce less heat — and not just because food is scarcer in winter. There's more to hair than color; it also offers insulation. Bison wallow in the summer, especially during the middle of the day. Wallowing puts soil into and onto their coat.

Cited by 0

Temperature control

Soviš, Jiří · Brno University of Technology Digital Library (Brno University of Technology) · 2019

Práce se zabývá problematikou regulace teploty pomocí neřízeného zdroje odpadního tepla přístroje v uzavřeném objektu. Cílem práce je seznámení se s danou problematikou a technologickými prostředky, využívaných v oblasti HVAC. Součástí práce je návrh řešení regulace teploty, ve které se využívá ztrátové teplo z kompresoru na vytápění kompresorovny a dále jako doplňkový zdroj tepla do výrobní haly, za účelem snížení nákladů. V rámci řešení algoritmu byl vytvořen tepelný model v prostředí Matlab/Simulink, na základě provedeného měření, který byl použit pro návrh PI regulátoru pomocí integrálního kritéria kvality regulace ITAE a metody Nelder-Mead simplex.

Cited by 0

Temperature control - 3: Control of spatial temperature distribution

J. R. Leigh · Institution of Engineering and Technology eBooks · 1988

In many heating processes, it will be the aim to remove the product (corresponding to the cube) once the centre temperature in the product has reached a specified uniformity. Calculation of the temperature distribution requires a knowledge of heat transfer rates that is normally difficult to obtain to a sufficient degree of accuracy. Calculation of the temperature distribution requires a knowledge of heat transfer rates that is normally difficult to obtain to a sufficient degree of accuracy.

Cited by 0

Optical transmitter, temperature control device, and temperature control method

YOSHIMA, SATOSHI, NODA, MASAKI · Institutional Repository of Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (Xian Institute of Optics and Precision Mechanics) · 2018

An optical transmitter (101) is provided with: a laser diode (11); a Peltier element (12) that adjusts the temperature of the laser diode (11); a target temperature setting circuit (3), which sets, to a first temperature, the target temperature of the laser diode (11) in a state wherein the laser diode (11) is emitting light, and which sets, to a second temperature, the target temperature of the laser diode (11) in a state wherein the laser diode (11) is not emitting light, said second temperature being lower than the first temperature; and a control circuit (4) that controls the Peltier element (12) on the basis of the temperature and the target temperature of the laser diode (11).

Cited by 0

Temperature Control in Extrusion the Requirements for Temperature Control

D. F. Grant, Philip Wilkinson · Measurement and Control · 1968

The object of this paper is to try to analyse, and also to some extent to justify, the temperature control requirements of the screw extrusion process. This paper and the following paper on ‘Design Strategies for the Control of Temperature’ will, we hope, be of interest both to the section of the Plastics Industry that uses extruders, and also to that part of the Instrumentation Industry which is concerned with the control of temperature. We believe that, in sectors of both industries, there are still many misconceptions as to the nature of the extrusion process and about the equipment used. To start with, we do not believe that the Plastics Industry knows the standard terms used by the Instrumentation Industry to describe the different types of instrument they employ. We hope Table I will help to clarify this situation. We also believe that the Instrumentation Industry has a limited understanding of the extrusion process, and so before describing what we believe to be the requirements for temperature control in extrusion, we will survey briefly the materials, products, properties, tolerances and also the equipment associated with this process.

Cited by 0Open access

Temperature-control system

Norazmi Nor Mazlee · 2009

This project title is ‘Temperature-Control System’ which is a particular system for server room. For the circuit, it consists of temperature sensor, PIC, LCD, driver circuits, AC air heater and AC motor. Three drivers are used for triggering process to switch on the AC heater and another two are for triggering levels of the motor. This motor will operate based on two temperature ranges and that means, it has two levels of speed. The function of this system is for controlling the temperature value inside of a regular room automatically. It will operate based on the values or ranges of temperature in the room which is detected by the temperature sensor.If the temperature in the first range (0oC to 15oC ),the air heater will be operated to heat the server room which in very cold temperature.If it is in the second range(16oC to 25oC) this system will not be enabled because it’s achieving normal temperature range.If temperature in range 26oC to 40oC,motor will be triggered for level 1 to decrease the temperature value. If it is more than 40oC, the motor will be triggered for level 2 and its speed becomes faster at this level. The both output devices are important to maintain the temperature value in the room .This system can be categorized in automatic system class and solve users’ problem.The problem always happen if air-conditioner broke down and definitely, the room becomes hotter or temperature increases. Besides that, temperature becomes too cold and influenced by weather from outside of the sever room. With that, the motor and air heater are important to keep maintaining the sever room in suitable temperature range. This system has temperature sensor which may detect the surrounding temperature and the outputs are operated based on the temperature ranges.Programming of the PIC is a important basic to read data or accept signal from the sensor .In the same time,it maintains the temperature inside of the room and make it suitable for user.

Cited by 0

Discontinuous temperature control

William K. Roots, Frederick Walker · Proceedings of the Institution of Electrical Engineers · 1965

1.6 million homes were solely electrically heated in the United States in 1963; by 1980, the predicted number is 19 million. In most of these residences temperature is controlled by a 2-position line-voltage thermostat in each room. Suitable continuous and quasicontinuous temperature-control systems have been developed, but the price trend of the semiconductor devices they employ indicates that they will not successfully compete with line-voltage thermostats in the next decade. The 2-position line-voltage methods currently available in the United States have economic and discomfort disadvantages. Facile graphical displays of the extra heating costs caused by cycle time and droop have been derived from a basic electrical-network analogue for the electric space-heating process. Test results illustrate the cold-air currents caused by long cycle times. 2-position controlled skirting-board heaters are prone to deposit dirt on walls; this tendency increases with cycle time. The performance of a discontinuously controlled electric space-heating process is conveniently characterised by portraying the cycle time, manipulated variable and droop in a cycling-characteristic display. The current problems of 2-position line-voltage-controlled electric space heating could be remedied if two performance requirements were set. Recommended values for these are suggested; these can be met if simple design criteria are observed, as is shown using a sample thermostat constructed from standard components.

Cited by 6

Electronics Temperature Control,

J. T. Pogson · Defense Technical Information Center (DTIC) · 1975

The results of a preliminary study on thermal modeling and analysis of microcircuits are presented. Studies covering typical components mounting methods, bonding agent materials component spacing, and cooling concepts are described. Temperature profiles of substrates, component temperatures and thermal resistances are presented. It is shown that the use of moly tabs, sputtered beryllia and thermoelectric coolers can significantly reduce component temperature levels. Additionally, it is illustrated that thermal modeling can aid the circuit designer in the layout and preliminary design phases. (Author)

Cited by 0