TY - GEN
T1 - The response of portable electronics to transient conditions of temperature and humidity
AU - Punch, Jeff
AU - Grimes, Ronan
AU - Heaslip, Greg
AU - Galkin, Timo
AU - Väkeväinen, Kyösti
AU - Kyyhkynen, Vesa
AU - Elonen, Erkko
PY - 2005
Y1 - 2005
N2 - The design of portable electronic systems for use in hot and humid conditions represents a significant design challenge for packaging engineers. Humidity drives a range of failure mechanisms: the alteration of material properties; hygromechanical stress phenomena; and the acceleration of corrosion and material migration. Moreover, portable electronic products such as mobile phones, CD players and digital cameras can experience rapidly varying conditions of temperature and humidity which, in certain conditions, can cause condensation to form on the internal and external surfaces of the product. Condensation - or even very high relative humidity - is a severe stimulus because it greatly accelerates corrosion and migration mechanisms. This paper considers the response of portable electronics to transient variations of temperature and humidity in order to assess the conditions under which condensation is likely to occur. A first-order coupled hygrothermal model is developed to represent the temperature and humidity response of a typical portable product using simple time constants. Experimental characterisation of a sample product is performed to evaluate the parameters of the model, and it is demonstrated how movement from one environment to another can precipitate condensation.
AB - The design of portable electronic systems for use in hot and humid conditions represents a significant design challenge for packaging engineers. Humidity drives a range of failure mechanisms: the alteration of material properties; hygromechanical stress phenomena; and the acceleration of corrosion and material migration. Moreover, portable electronic products such as mobile phones, CD players and digital cameras can experience rapidly varying conditions of temperature and humidity which, in certain conditions, can cause condensation to form on the internal and external surfaces of the product. Condensation - or even very high relative humidity - is a severe stimulus because it greatly accelerates corrosion and migration mechanisms. This paper considers the response of portable electronics to transient variations of temperature and humidity in order to assess the conditions under which condensation is likely to occur. A first-order coupled hygrothermal model is developed to represent the temperature and humidity response of a typical portable product using simple time constants. Experimental characterisation of a sample product is performed to evaluate the parameters of the model, and it is demonstrated how movement from one environment to another can precipitate condensation.
UR - http://www.scopus.com/inward/record.url?scp=29644433077&partnerID=8YFLogxK
U2 - 10.1115/HT2005-72578
DO - 10.1115/HT2005-72578
M3 - Conference contribution
AN - SCOPUS:29644433077
SN - 0791847314
SN - 9780791847312
T3 - Proceedings of the ASME Summer Heat Transfer Conference
SP - 871
EP - 876
BT - Proceedings of the ASME Summer Heat Transfer Conference, HT 2005
T2 - 2005 ASME Summer Heat Transfer Conference, HT 2005
Y2 - 17 July 2005 through 22 July 2005
ER -