Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction

The characteristics of a medical heat and moisture exchanger with filter (HMEF) that contained polyurethane sponges and CaCl2 were investigated experimentally and model analysis was performed. Variations in the temperature and humidity were measured. Saturated air at 37 °C simulating exhalation and...

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Autores principales:	Yoshihito OKINAGA, Makoto MURATA, Toshihisa UEDA, Takeshi YOKOMORI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	heat and moisture exchanger with filter periodic response cacl2 respiration medical device temperature humidity Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/3e0ccf85421a48b3bbd072aedabf6141
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spelling	oai:doaj.org-article:3e0ccf85421a48b3bbd072aedabf61412021-11-29T05:52:02ZResponse of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction2187-974510.1299/mej.19-00335https://doaj.org/article/3e0ccf85421a48b3bbd072aedabf61412020-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/1/7_19-00335/_pdf/-char/enhttps://doaj.org/toc/2187-9745The characteristics of a medical heat and moisture exchanger with filter (HMEF) that contained polyurethane sponges and CaCl2 were investigated experimentally and model analysis was performed. Variations in the temperature and humidity were measured. Saturated air at 37 °C simulating exhalation and dry air at 26 °C simulating inhalation were fed alternatively through the HMEF in opposite directions. The period was set as 256 s, 64 s, 16 s and 4 s. When the period was long (256 and 64 s), the polyurethane sponges and CaCl2 played an important role in condensation and evaporation of water and the amplitudes of the temperature variation was so large that it overshot the input condition. When the period was shortened (4 s), the amplitudes of the temperature and humidity variations decreased and the relative humidity of the patient side of the HMEF gradually reached that of the exhalation conditions. This suggests that the characteristic times of condensation and evaporation were longer than that of the respiration (τb = 4 s). In other words, the unsteady effect is important for the condensation and vaporization mechanism of HMEF. The mechanism was supported by the model analysis. In addition, comparing the results of the experiments and model analysis elucidated the effect of the connecting pipe, which corresponds to the dead space effect in clinical use.Yoshihito OKINAGAMakoto MURATAToshihisa UEDATakeshi YOKOMORIThe Japan Society of Mechanical Engineersarticleheat and moisture exchanger with filterperiodic responsecacl2respirationmedical devicetemperaturehumidityMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 1, Pp 19-00335-19-00335 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	heat and moisture exchanger with filter periodic response cacl2 respiration medical device temperature humidity Mechanical engineering and machinery TJ1-1570
spellingShingle	heat and moisture exchanger with filter periodic response cacl2 respiration medical device temperature humidity Mechanical engineering and machinery TJ1-1570 Yoshihito OKINAGA Makoto MURATA Toshihisa UEDA Takeshi YOKOMORI Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction
description	The characteristics of a medical heat and moisture exchanger with filter (HMEF) that contained polyurethane sponges and CaCl2 were investigated experimentally and model analysis was performed. Variations in the temperature and humidity were measured. Saturated air at 37 °C simulating exhalation and dry air at 26 °C simulating inhalation were fed alternatively through the HMEF in opposite directions. The period was set as 256 s, 64 s, 16 s and 4 s. When the period was long (256 and 64 s), the polyurethane sponges and CaCl2 played an important role in condensation and evaporation of water and the amplitudes of the temperature variation was so large that it overshot the input condition. When the period was shortened (4 s), the amplitudes of the temperature and humidity variations decreased and the relative humidity of the patient side of the HMEF gradually reached that of the exhalation conditions. This suggests that the characteristic times of condensation and evaporation were longer than that of the respiration (τb = 4 s). In other words, the unsteady effect is important for the condensation and vaporization mechanism of HMEF. The mechanism was supported by the model analysis. In addition, comparing the results of the experiments and model analysis elucidated the effect of the connecting pipe, which corresponds to the dead space effect in clinical use.
format	article
author	Yoshihito OKINAGA Makoto MURATA Toshihisa UEDA Takeshi YOKOMORI
author_facet	Yoshihito OKINAGA Makoto MURATA Toshihisa UEDA Takeshi YOKOMORI
author_sort	Yoshihito OKINAGA
title	Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction
title_short	Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction
title_full	Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction
title_fullStr	Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction
title_full_unstemmed	Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction
title_sort	response of a heat and moisture exchanger containing cacl2 to the periodic change of flow direction
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/3e0ccf85421a48b3bbd072aedabf6141
work_keys_str_mv	AT yoshihitookinaga responseofaheatandmoistureexchangercontainingcacl2totheperiodicchangeofflowdirection AT makotomurata responseofaheatandmoistureexchangercontainingcacl2totheperiodicchangeofflowdirection AT toshihisaueda responseofaheatandmoistureexchangercontainingcacl2totheperiodicchangeofflowdirection AT takeshiyokomori responseofaheatandmoistureexchangercontainingcacl2totheperiodicchangeofflowdirection
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Response of a heat and moisture exchanger containing CaCl2 to the periodic change of flow direction

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