Presentation Information
[10p-N406-2]Evaluation of Relationship between Air Temperature and Humidity and Condensing Surface Temperature in Humidity Measurement Method using Heat Pipe
〇Naoya Ishiwata1, Hisashi Abe1 (1.AIST)
Keywords:
environmental test,heat balance,control
Environmental tests are used in many industries and often require using high-temperature and high-humidity conditions. Hygrometers used in environmental-test chambers should be robust to such harsh conditions, however those adopted in commercial chambers have several issues in such environment. To tackle this challenge, a new hygrometric method based on condensation with a heat pipe has been developed. Authors previously developed a new instrument with a precise temperature control unit and improved some properties of the method, such as temperature stability. However, the relationship between heat pipe temperature and humidity had not been investigated in detail. In this study, we researched this relationship under various temperature and humidity conditions. An analysis based on heat balance on the heat pipe revealed that humidity in a test chamber was represented as a function of the difference between the chamber temperature and the heat pipe temperature. Deviations between measured relative humidity and that calculated by using the above equation were less than ±3 % in the temperature and humidity ranges of 40 °C to 80 °C and 50 % to 90 %, respectively.