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Mechanical Design Calculator

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New Calculator Added to Mechanical Insulation Design Guide

A new calculator has been introduced in the Mechanical Insulation Design Guide (MIDG): the Simple Payback, Rate of Return, and Emissions Calculator. The spreadsheet calculator is an aid to understanding the relationships between energy, economics, and emissions for insulated systems for above and below ambient service conditions.

The calculator estimates the heat flow through a vertical flat steel surface (typical of the sides of a large steel tank containing a heated or cooled fluid). Information concerning a hypothetical insulation system (e.g. the area, operating temperature, ambient temperature and wind speed, thermal conductivity and surface emittance of a proposed insulation system, etc) may be input by the user. Calculated results are given over a range of insulation thicknesses and include:

  1. surface temperature
  2. heat flow
  3. annual cost of fuel
  4. payback period
  5. annualized rate of return
  6. annual CO2 emissions.

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New Calculator Added to Mechanical Insulation Design Guide

A new calculator has been introduced in the Mechanical Insulation Design Guide (MIDG): the Simple Payback, Rate of Return, and Emissions Calculator. The spreadsheet calculator is an aid to understanding the relationships between energy, economics, and emissions for insulated systems for above and below ambient service conditions.

The calculator estimates the heat flow through a vertical flat steel surface (typical of the sides of a large steel tank containing a heated or cooled fluid). Information concerning a hypothetical insulation system (e.g. the area, operating temperature, ambient temperature and wind speed, thermal conductivity and surface emittance of a proposed insulation system, etc) may be input by the user. Calculated results are given over a range of insulation thicknesses and include:

  1. surface temperature
  2. heat flow
  3. annual cost of fuel
  4. payback period
  5. annualized rate of return
  6. annual CO2 emissions.

The calculator was developed for MIDG by the National Insulation Association (www.insulation.org) for illustrative purposes and makes a number of simplifying assumptions. Other geometries and more complex insulation systems may be analyzed using software such as the 3E Plus® program developed by the North American Insulation Manufacturers Association (NAIMA), available at www.pipeinsulation.org.



โปรแกรมที่ว่า คือ 3EPlus

3E Plus Program Overview

  • Determines economic thickness of insulations based on return on investment for chosen fuel cost, installed cost, tax rates, maintenance, etc.
  • Calculates the amount of insulation needed for personnel protection for various design conditions.
  • Calculates the thickness of insulation needed for condensation control.
  • Calculates greenhouse gas emissions and reductions.
  • Determines surface temperature and heat loss/gain calculations of individual insulation thickness up to 10 inches (250 mm).
  • Solves for outside insulated surface temperatures for all types of insulation applications at different process temperatures and various configurations.
  • Calculates bare vs. insulated heat loss efficiency percentages for horizontal and vertical piping, ducts and flat surfaces.
  • Performs calculations for various flat surfaces, selected pipe sizes and all standard iron pipe sizes from 1/2" to 48" (15 - 1200 mm).
  • Calculates heat loss/gain and outside insulated surface temperatures for any insulation material provided the thermal conductivity, associated mean temperatures, and temperature limit are entered by the user.

3E Plus® Program Details

  • 3E Plus operates in a Windows® 98, 2000, and XP environments.
  • Performs calculations for most types of insulation materials and accepts performance data provided by the user for other materials.
  • Provides calculations for many fuel types and five different surface orientations. User can add own fuel combinations.
  • Uses calculations and default values from independent sources. Contains updated methodology from the most recent version of ASTM C 680 Standard Practices for Determination of Heat Gain or Loss and the Surface Temperature of Insulation Piping on Equipment Systems by the Use of a Computer System.
  • Allows user to customize program by adding and saving individual company's insulation installed cost estimates.
  • Has all the latest thermal curves contained in the ASTM material standards.
  • Automatically calculates thickness tables.
  • Calculates in both metric and inch-pound units.

Calculation Features

3E Plus® can perform a wide range of calculations including:

Energy

  • The thermal performance of both insulated and uninsulated piping and equipment.
  • The energy (Btu) currently being saved with existing insulation systems and the actual dollar value of those savings.
  • The potential Btu savings with an insulation upgrade and the fuel dollar value of those savings.

Economics

  • The cost of operating systems with existing insulation in terms of Btu and dollars.
  • The potential cost reduction of operating those same systems with an insulation upgrade.

Environmental

  • The number of pounds of greenhouse gases [CO2, NOx , and Carbon Equivalent (CE)] currently being prevented from release into the atmosphere due to reduced fuel consumption resulting from greater insulation thickness.
  • The potential number of pounds of greenhouse gases that could be prevented from release into the atmosphere through an insulation upgrade, resulting from greater reductions in fuel consumption.