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Air cycle machines were first developed in the 19th century for providing chilling on ships. The technique is a reverse Brayton cycle (the thermodynamic cycle of a gas turbine engine) and is also known as a Bell Coleman cycle or "Air-Standard Refrigeration Cycle".
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The Johnson Sea Link was the successor to Edwin Link's previous submersible, Deep Diver, the first small submersible designed for lockout diving.In 1968 the Bureau of Ships determined that Deep Diver was unsafe for use at great depths or in extremely cold temperatures because of the substitution of the wrong kind of steel, which became brittle in cold water, in some parts of the submersible. [6]
Similarly, an oxygen inhalation protocol was recommend for malaria (literally translated to "bad air") in 1830 based on malaria symptoms aligning with carbon monoxide poisoning. [9] Other oxygen protocols emerged in the late 1800s. [ 10 ]
Temperature and convection of the surrounding medium: Ambient temperature of the water during the dive, and air temperature before and after the dive. Wind chill. Increased convective cooling by ambient air; Evaporative cooling in air; Breathing gas temperature, density, specific heat, and respiratory minute volume (RMV).
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