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Harlan Bengtson

Senior Writer
Contributions: 170
Member of: 4 channels
Member since:
July 06, 2009
Articles

  • Solar Energy Quiz

    Are you a solar energy expert ... or an interested novice? Take this quiz, see where you rank, and perhaps learn more about solar energy and how solar energy is being put to use for passive solar heating, photovoltaic panels, and active solar heating...
    Published on  September 13, 2011 to Renewable Energy

  • Heat Exchanger Designs

    Calculations for heat exchanger designs use heat transfer parameters such as convection heat transfer coefficients, overall heat transfer coefficients, and log mean temperature differences. These calculations are needed for shell and tube and double...
    Published on  September 9, 2011 to Mechanical Engineering

  • Fluid Mechanics/Hydraulics in Civil Engineering

    The widespread applications of fluid mechanics and hydraulics in civil engineering include transportation of fluids in pipes and in open channels, as well as flow measurement for both pipes and open channels. These areas of application use a variety...
    Published on  September 8, 2011 to Civil Engineering

  • Darcy's Law for Modeling Groundwater Flow

    Modeling of groundwater flow is important for a variety of applications, such as groundwater flow from an aquifer through wells for water supply or irrigation, and remediation of groundwater contamination. A primary tool for groundwater modeling is Darcy's...
    Published on  September 1, 2011 to Civil Engineering

  • Preliminary Heat Exchanger Design Example

    Design of heat exchangers is an iterative process, using the heat exchanger design equation to estimate the needed heat transfer area, based on an estimate of the overall heat transfer coefficient, specified heat load, and log mean temperature difference...
    Published on  August 17, 2011 to Mechanical Engineering

  • Calculation of Critical Depth and Critical Slope for Open Channel Flow

    Calculation of critical slope and critical depth for open channel flow is needed for some applications. Read on for the equations, calculation procedures, and examples for a rectangular channel and for a trapezoidal channel.
    Published on  August 2, 2011 to Civil Engineering

  • What is Structural Engineering?

    What is a Structural Engineer? He or she is a person who designs, analyzes and builds structures. Structural engineering, a branch of civil engineering, involves design of structures (e.g. buildings, bridges, etc.) so that they will withstand...
    Published on  June 29, 2011 to Civil Engineering

  • Download Excel Spreadsheets for Activated Sludge Waste Water Treatment Calculations

    Activated sludge wastewater treatment calculations can be made using the Excel formulas in the downloadable spreadsheets. Biochemical oxygen demand (BOD), waste water flow rates and total suspended solids concentrations are used in the activated...
    Published on  June 1, 2011 to Civil Engineering

  • Excel Formulas for Pressure Drop in Shell and Tube Heat Exchanger Design

    Excel formulas for calculation of frictional pressure drop in shell and tube and double pipe heat exchanger design can be downloaded from this article. The pressure drop calculation is for the tubes in a shell and tube heat exchanger or for the inside...
    Published on  May 31, 2011 to Mechanical Engineering

  • Variations in Activated Sludge Wastewater Treatment Systems

    Activated sludge waste water treatment systems are the most widely used type of biological wastewater treatment for removal of biochemical oxygen demand from wastewater. All activated sludge process variations bring dissolved oxygen, aerobic bacteria...
    Published on  May 27, 2011 to Environmental Science

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