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20. Continued 



wal ml that identif.es heater configurations for dosed-crcuu scuba d.vers^ 





1. Diver-heater 



Civil Engineering Laboratory 



A SELP-CONTAINED EXPERIMENTAL DIVER HEATER, 



by S. A. Black and S. S. Sergcv 



TN-1501 76 pp illus September 1977 Unclassified 



2. Electrochemical heat source 1. 43-015 



Frec-swmming divers working in cold water for extended penods of tune «qu.re a 

 self-contained, active heat source to maintain their P hysiolog,cal thermal cquu.bnum. 

 Slou sly. <" accelerated reaction of magnesium with scawater was shown to be a su, able 

 heat source for diving applications. The magnesium heat cell was confuted as a short- 



rcuiTd b-ery w ith g alternate electrodes of magnesium and stee, spaced closely together; 

 the unit is activated by immersion in a seawater electrolyte. An exper.men.a. heater was 

 fabricated that incorporated known improvements in the cell. The se.f-conta.ncd un.t 

 provided 1.000 watts for up to 8 hours. A human factors study was made that ,dent,f,cs 

 heater configurations for closed-circuit scuba divers. 



Unclassified 



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