{"id":9397,"date":"2020-12-22T19:48:28","date_gmt":"2020-12-22T19:48:28","guid":{"rendered":"https:\/\/insulation.org\/?page_id=9397"},"modified":"2022-08-17T19:09:08","modified_gmt":"2022-08-17T19:09:08","slug":"temperature-drop-calculator-for-hydronic-piping","status":"publish","type":"page","link":"https:\/\/insulation.org\/training-tools\/designguide\/simple-calculators\/temperature-drop-calculator-for-hydronic-piping\/","title":{"rendered":"Temperature Drop Calculator For Hydronic Piping"},"content":{"rendered":"
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Calculates the Temperature Change of Water Flowing in a Pipe (Reference: 2009 ASHRAE HoF, Chapter 4, Equation 48, (pg 4.21)<\/em>)<\/p>\n

This calculator estimates the temperature drop (or rise) of water flowing in a pipe.<\/p>\n

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INSTRUCTIONS<\/h4>\n

(Input information may generally be be obtained from design documents or field measurements)<\/strong><\/p>\n

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  • Line 1. Enter the temperature of the water entering the pipe<\/li>\n
  • Line 2. Enter the ambient temperature (temperature of the air surrounding the pipe)<\/li>\n
  • Line 3. Enter the wind speed of the ambient air in miles per hour<\/li>\n
  • Line 4. Enter the flow rate of the water carried by the pipe in gallons per minute.
    \nNote: Calculator does not screen for reasonable flow velocities, Hydronic piping is normally sized for flow velocities between 5 and 12 feet\/sec<\/strong><\/li>\n
  • Line 5. Enter the length of the piping run in feet<\/li>\n
  • Line 6. Select the nominal pipe size in inches<\/li>\n
  • Line 7. Select the nominal thickness of insulation in inches<\/li>\n
  • Line 8. Select an insulation material.
    \nNote: Calculator does not screen for material temperature limitations.<\/strong><\/li>\n
  • Line 9. Select thermal emittance of the outer jacket material.<\/li>\n<\/ul>\n

    Note<\/strong>: NA = Insulation Size Not Available. Some sizes and thicknesses may not be commercially available.<\/p>\n

    ASSUMPTIONS<\/h4>\n
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    • One dimensional, steady state heat transfer<\/li>\n
    • U-factor constant at average conditions<\/li>\n
    • Thermal resistance of film at inner pipe surface neglected<\/li>\n
    • Thermal conductivity based on ASTM Specification Values. Refer to the introductory notes for further clarifications.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\t\t