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What is the rule of thumb, supply air temperature to a space in a Heating mode?

What is the rule of thumb, supply air temperature to a space in a Heating mode?

Engineering   Mechanical-Engineering   
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Answer #1

the 25/15/10 rule (rule of thumb) for space heating -

  • Minimum supply air temperature = space temperature + 25oF
  • Minimum supply water temperature for air heating coil = supply air temperature + 15oF
  • Minimum geothermal temperature entering isolation heat exchanger = coil supply water temperature + 10oF

The same temperature differences apply to the leaving side of the heat exchange equipment -

  • Minimum air coil leaving water temperature = space + 15oF
  • Minimum geothermal temperature leaving isolation heat exchanger = coil leaving temperature + 10oF
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