GB/T 27698.3-2023 Performance test methods for heat exchangers and heat transfer elements Part 3: Heat transfer elements has been changed from GB/T 27698.6-2011 Test method for the performance of heat exchangers and heat exchange element.Part 6:Fing tube for air-cooled heat exchangers .
GB/T 27698.3-2023 Performance test methods for heat exchangers and heat transfer elements Part 3: Heat transfer elements has been changed from GB/T 27698.5-2011 Test method for the performance of heat exchangers and heat exchange element.Part 5:Heat transfer tube for tubular heat exchangers .
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