GB/T 27698.2-2023 Performance test methods for heat exchangers and heat transfer elements - Part 2: Heat exchangers has been changed from GB/T 27698.3-2011 Test method for the performance of heat exchangers and heat exchange element. Part 3:Plate heat exchanger .
GB/T 27698.2-2023 Performance test methods for heat exchangers and heat transfer elements - Part 2: Heat exchangers has been changed from GB/T 27698.4-2011 Test method for the performance of heat exchangers and heat exchange element.Part 4:Spiral heat exchanger.
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