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Thermal conductance measurements were carried out for pipe insulation on a large-scale test apparatus. A pipe 18 in. (0.457 m) in diameter and 20 ft (6.08 m) long was used. A chamber cooled to −70°F (−56.7°C) by expansion of liquid nitrogen surrounded the pipe. Water inside the pipe was heated to 160°F (71.1°C) by electrical resistance heaters. Several steady-state tests were made using air and water inside the pipe. A transient heat loss test was also made using water inside the pipe.
Close agreement was found between the theoretical steady-state thermal conductance factor and that experimentally measured. The numerical difference can be explained by center joint heat losses. Close agreement was also found in the transient response of the system to a loss of heat inside the pipe as experimentally recorded and compared to a theoretical approach.
thermal conductivity, pipe insulation, steels, fiberglass reinforced plastics, polyurethane resins, thermal insulation, heat transmission
Project manager, Technical Center, Owens-Corning Fiberglas Corp., Granville, Ohio