Browse Prior Art Database

Condensation Detector

IP.com Disclosure Number: IPCOM000073921D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Aakalu, NG: AUTHOR [+2]

Abstract

A drastic decrease in interface thermal resistance takes place when the interface changes from dry to wet. This drastic change is utilized to sense the formation of a condensate on a "cold" surface.

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Condensation Detector

A drastic decrease in interface thermal resistance takes place when the interface changes from dry to wet. This drastic change is utilized to sense the formation of a condensate on a "cold" surface.

A heater assembly which includes a heater 10 and a thermocouple or thermistor 12 is arranged to form an interface 14 with a surface such as a pipe wall 16. The thermocouple 12 is located adjacent the interface 14 and a second thermocouple 18 is located on the other side of the interface 14 in the pipe wall
16. A predetermined amount of heat is produced by the insulated heater 10 such that the heat will flow across the dry interface 14 which has a relatively high- thermal resistance. A temperature gradient will be measurable between the two thermocouples 12,18. This temperature gradient will be dependent on the amount of heat flow and the interface resistance. As condensate forms on the cold pipe 16, the interface surfaces are wetted by capillary action by means of the pores or grooves 20 which are scribed in the interface 14 surface. The wetting of the interface 14 by the introduction of condensate will cause a marked decrease in the interface resistance which decrease will be indicated by a drop in the temperature gradient. Thus, the temperature gradient can be monitored to provide an indication of the change in interface thermal resistance.

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