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Investigation on condensate temperature from cooling coil.

Number: 2111

Author(s) : STUSYNSKI T., YU J.

Summary

When moist air passes through a cooling coil, the potential exists for that moisture to condense on the coil's surface. The temperature at which that occurs is the condensing temperature or the dew point temperature. The dew-point temperature is determined by air pressure and humidity based on thermodynamic theory. The condensate, which is condensed water vapor, usually remains on the cold surface for some amount of time before being removed by gravity, the air stream, or both. The temperature of that condensate may not be the same as the dew-point temperature. In formulas found in the 2020 ASHRAE handbook – “HVAC Systems and Equipment,” condensate temperature is assumed to be equal to the wet-bulb temperature at the leaving condition. In this study, a 12-row cooling coil was tested under fully wet surface conditions. The condensate temperature profile along the air-flow direction as well as the average condensate temperature were measured under different inlet humidities and face velocities. The test results showed that the condensate temperature was higher than the wet-bulb temperature. Factors that contributed to this included air temperature, inlet humidity, air velocity, water temperature, and water velocity.

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Pages: 7 p.

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Details

  • Original title: Investigation on condensate temperature from cooling coil.
  • Record ID : 30032977
  • Languages: English
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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