Experimental Determination of Heat Requirements for the MARK I PTC

摘要

The purpose of the test program was to establish the amount of heat required to maintain the interior of the Mark I PTC at a comfortable level for divers. The test showed that for a condition of moderate forced convection at 810 feet equivalent internal pressure, a heat input of 1620 B/hr (0.48 kw) is required for each degree of temperature differential that is to be maintained between the interior of the PTC and the outside seawater. Thus, if an interior temperature of 90 F is desired in 40 F water, this would require a total heat input of 81,000 B/hr (24 kw). These results are valid only for a condition of forced convection similar to the test situation. Although the heat requirement seems quite high, it is only equivalent to the air-conditioning load in a modern automobile.