Circular pipe culverts are widely used in building projects. Do you know the equations that relate pipe culvert parameters under the condition of inlet control, or outlet control? Learn the equations in this article.
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 pipe heat exchangers, as well as other types.
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 of calculations for design and for analysis.
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.
Acid base properties of organic compounds are the same as the properties of inorganic acids and bases. Organic acids and bases are all weak acids and bases, however, while there are strong and weak inorganic acids and bases. Organic acids and bases, thus don’t exhibit the properties strongly.
Environmental engineering deals with air pollution control, hazardous waste management, wastewater treatment, and water treatment. Environmental engineering work includes planning, design, construction, and operation of equipment, systems, and structures for the protection of the environment.
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 sludge calculations
Download Excel spreadsheet templates for storm water runoff control structure design in U.S. units or S.I. units, to be used with storm water retention or detention ponds. The control structure will reduce the detention pond discharge to the pre-development, watershed peak storm water runoff rate.
The Excel spreadsheets that can be downloaded from this article use Excel formulas to calculate the volume needed for storm water retention or detention ponds. Parameters needed in the equations include, watershed time of concentration and peak storm water runoff rate.
Broad crested weir flow rate calculations can be made with the Excel spreadsheets that can be downloaded from this article. The open channel flow rate can be found using a broad crested weir equation for critical flow over the weir, along with the minimum weir height needed for critical flow.
Download spreadsheets with Excel formulas to make Parshall flume open channel flow measurement calculations. These have been built into the Excel spreadsheets for free flow and submerged flow with U.S. units or S.I. units.
Get Excel spreadsheet templates for calculating a watershed time of concentration. This parameter is of interest primarily for its use to calculate peak storm water runoff rate for storm water management facilities.
Rational method runoff coefficient tables are provided in this article. Watershed runoff coefficients depend upon the land use, soil type and slope of the watershed. Runoff coefficients are needed to calculate storm water runoff rate using the Rational Method.
Download Excel spreadsheets to calculate design rainfall intensity and design peak storm water runoff rate. The Excel formulas derive an equation for rainfall intensity and then calculate the design values in either U.S. units or S.I. units.
Excel spreadsheets for overall heat transfer coefficient calculations in U.S. units or S.I. units can be downloaded from this article. This type of calculation is needed as part of the iterative heat exchanger design process.
Forced convection heat transfer coefficient correlations are in terms of Nusselt, Prandtl, and Reynolds numbers. Download Excel spreadsheets to help calculate coefficients for several common forced convection heat transfer configurations.
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 pipe in a double pipe heat exchanger.
Excel spreadsheet templates for heat exchanger design can be downloaded in either S.I. units or U.S. units. The spreadsheets calculate heat transfer area needed and number of tubes or pipe length, for given values of several variables, including an estimate of the overall heat transfer coefficient.