HTRI and EDR design temperature ranges.
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Dear friends, I am using HTRI to calculate a low-temperature heat exchanger. The temperature range of hot and cold streams is -180℃~-196℃. Running prompts: “The maximum process temperature is outside the relevant range of the thermal conductivity dependence. This thermal conductivity is calculated at the temperature limit. For No. 7 pipe metal, this temperature limit is 70 degrees Fahrenheit (21 degrees Celsius). ”So are the calculated results of HTRI still credible at this temperature? Where can I see the thermal conductivity of heat exchange tubes? What is the design temperature range of HTRI? Same problem for EDR: At a temperature of -196°C, are the physical properties of the heat exchange tubes provided by EDR accurate? Where can I see the thermal conductivity coefficient in EDR? What is the design temperature range of EDR?
For the design temperature range of HTRI and EDR, generally speaking, their calculation models and data input limits are based on the conventional process temperature range (usually between -50°C and 1000°C). Therefore, you may encounter some limitations or caveats when calculating low-temperature heat exchangers. For HTRI, a warning at runtime that the thermal conductivity correlation is outside the range means that the thermal conductivity correlation used by the software may not be accurate at the selected temperature. In this particular case, according to the prompt, the temperature limit for pipe 7 metal is 70 degrees Fahrenheit (21 degrees Celsius), which means that the software may not have suitable thermal conductivity correlation data for lower temperatures. Therefore, in the range of -180℃ to -196℃, the calculation results of HTRI may be affected and the reliability may be reduced. For EDR, the design temperature range is usually based on conventional process temperatures, so there may be similar restrictions or warnings for lower temperatures. At a temperature of -196°C, you need to check the documentation or contact the developer to see whether the physical properties of the heat exchange tubes provided by EDR are accurate. Generally speaking, physical property data in EDR should be verified, but verification under extreme temperature conditions is still recommended. For specific methods of checking thermal conductivity, you can refer to the user manuals or official documents of HTRI and EDR. These documents typically provide instructions on how to find and use relevant data such as thermal conductivity. In summary, for the design and calculation of low-temperature heat exchangers, the reliability of the results may be reduced outside the design temperature range of the software, so it needs to be handled with caution. It is recommended in this case to contact the software developer or seek the advice of other professionals to ensure the accuracy of the results. .