The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform

Li Li - One of the best experts on this subject based on the ideXlab platform.

J.l. Lardear - One of the best experts on this subject based on the ideXlab platform.

  • Control of self-regulating Heating Cable for use in pipeline Heating applications
    IEEE Transactions on Industry Applications, 1991
    Co-Authors: J.l. Lardear
    Abstract:

    Self-regulating Heating Cable is an effective method of electrical heat tracing. The control of temperature without conventional sensors such as resistance temperature detectors (RTDs) and thermocouples is described. The theory of temperature control using variable self-regulating Cable is discussed. Characteristics unique to this method of heat tracing are detailed, as is a controller specified to meet these requirements. A cost-effective control system is described, and laboratory results are presented.

  • Control of self-regulating Heating Cable for use in pipeline Heating applications
    37th Annual Conference on Petroleum and Chemical Industry, 1990
    Co-Authors: J.l. Lardear
    Abstract:

    Self-regulating Heating Cable is an effective method of electrical heat tracing. The control of temperature without conventional sensors such as RTDs and thermocouples is described. The theory of temperature control using variable self-regulating Cable is discussed. Characteristics unique to this method of heat tracing are detailed and a controller specified to meet these requirements. A cost-effective control system is described and laboratory results presented.

Bing Li - One of the best experts on this subject based on the ideXlab platform.

W. Peterson - One of the best experts on this subject based on the ideXlab platform.

  • Stationary thermal field in a long duct of an electrical Heating system
    Electrical Engineering, 1996
    Co-Authors: J. Goŀebiowski, W. Peterson
    Abstract:

    The subject of this work is the analysis of a stationary thermal field in a long duct of an electrical floor Heating system. Parallel sectors of the Heating Cable are modelled by heat sources of the emitted power linear density. The resultant thermal field is described by a partial differential equation of the elliptic type with boundary conditions of the second and third kind. The problem is solved by the method of eigenfunctions. The results are reduced to a dimensionless form and numerically processed. The field distributions obtained are presented in graphical form, with the number of sectors of the Heating Cable in the duct being changed.

  • Stationary thermal field in a long duct of an electrical Heating system
    Electrical Engineering, 1996
    Co-Authors: J. Goŀebiowski, W. Peterson
    Abstract:

    Der Artikel analysiert das stationäre Temperaturfeld im langen Kanal einer elektrischen Heizung. Parallele Kabelstrecken wurden durch Wärmequellen ersertzt. Das Temperaturfeld wird mit Hilfe der partiellen Differentialgleichung des elliptischen Typs dargestellt. Dieses Problem hat man durch die Eigenfunktion gelöst. Die Ergebnisse wurden in eine dimensionslose Form umgewandelt und numerisch bearbeitet. Die Feldverteilungen wurden graphisch dargestellt, wobei die Anzahl der Kabelabschnitte verändert wird. The subject of this work is the analysis of a stationary thermal field in a long duct of an electrical floor Heating system. Parallel sectors of the Heating Cable are modelled by heat sources of the emitted power linear density. The resultant thermal field is described by a partial differential equation of the elliptic type with boundary conditions of the second and third kind. The problem is solved by the method of eigenfunctions. The results are reduced to a dimensionless form and numerically processed. The field distributions obtained are presented in graphical form, with the number of sectors of the Heating Cable in the duct being changed.

Paul A. Steudler - One of the best experts on this subject based on the ideXlab platform.

  • Soil warming and trace gas fluxes: experimental design and preliminary flux results
    Oecologia, 1993
    Co-Authors: William T. Peterjohn, Jerry M. Melillo, Francis P. Bowles, Paul A. Steudler
    Abstract:

    We conducted several experiments to determine a procedure for uniformly warming soil 5° C above ambient using a buried Heating Cable. These experiments produced a successful design that could: 1) maintain a temperature difference of 5° C over a wide range of environmental conditions; 2) reduce inter-Cable temperture variability to ca. 1.5° C; 3) maintain a temperature difference of 5° C near the edges of the plot; and 4) respond rapidly to changes in the environment. In addition, this design required electrical power only 42% of the time. Preliminary measurements indicate that Heating increased CO_2 emission by a factor of ca. 1.6 and decreased the C concentration in the O soil horizon by as much as 36%. In addition, warming the soil accelerated the emergence and early growth of the wild lily of the valley ( Maianthemum canadense Desf.). The relationship between CO_2 flux and soil temperature derived from our soil warming experiment was consistent with data from other hardwood forests around the world. Since the other hardwood forests were warmed naturally, it appears that for soil respiration, warming the soil with buried Heating Cables differs little from natural, aboveground warming. By warming soil beyond the range of natural variability, a multi-site, long-term soil warming experiment may be valuable in helping us understand how ecosystems will respond to global warming.