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This post was last edited by jia717 on 2009-9-3 21:49. Fill-in-the-blank questions: 1. According to JB/T7261-94, when a heat exchanger uses new types of fins or new brazing techniques, it is necessary to conduct __; the burst pressure should be no less than __ times the design pressure, and __ is considered acceptable. 2. The unit of a plate-fin heat exchanger is mainly composed of __, __, and ___. This question was provided by member luhongtai; the provider should keep an eye on it. The purpose of this *topic is to help everyone review some basic theoretical knowledge, gain new insights by reviewing what has been learned before, discuss and gain a deeper understanding of standards or specifications, as well as address specific issues encountered in practice. This enables us to learn together and improve together; we welcome all interested participants to get involved actively. If you have good *questions, you can also provide them to us; we will offer certain rewards to those who provide them. For more details, please refer to the top post in the heat exchange forum titled “Special Thread for Collecting Technical Questions and Answers Related to the Heat Exchange Area”, with the link: http://bbs.hcbbs.com/thread-526242-1-1.html. Note: 1. For fill-in-the-blank, multiple-choice, and true/false questions, please reply using the hidden format. Rewards will be given to those who answer correctly; those who do not use the hidden format or revise their replies will not receive any rewards. Please cooperate actively. 2. For multiple accounts under the same IP address, only the response from the first one is considered valid. Correct answer: In a burst test, the burst pressure should be no less than 5 times the design pressure, and it is considered successful if the fins break. 4. The unit of a plate-fin heat exchanger is mainly composed of partitions, fins, and seals.
Blasting test 5 wings broken Wings Partition Seals
This post was last edited by jia717 on 2009-9-2 08:00. 1. According to JB/T7261-94, when a heat exchanger uses new types of fins or new brazing techniques, ___ must be carried out; the burst pressure should be no less than __ times the design pressure, and __ shall be considered as the passing criterion. 2. The unit of a plate-fin heat exchanger is mainly composed of __, __, and ___. 1. Blasting test, 4-6, fin tensile fracture 2. Plate bundle, head, nozzle
1. Fin bursting tests should be conducted. When blasting the test specimen, the blasting pressure should be no less than 5 times the design pressure, and it is considered successful if the fins are broken. 2. It consists of three parts: fins, partitions, and seals.
1. In accordance with JB/T7261-94, when a heat exchanger uses new fins or a new brazing process, heat treatment is required; the burst pressure shall be not less than 1.5 times the design pressure, with 1.25 considered acceptable. 2. The unit of a plate-fin heat exchanger consists mainly of the core, end caps, tubes, and supports. Heat exchange is carried out by the core; therefore, the most critical component is the core. The core consists of fins, partitions, seals, and guide vanes.
1. Fin bursting test, 5. Fin breaking ； 2. Core, head, nozzles, and supports.
The answers are: 1. Heat treatment, 1.5, 1.25; 2. Core, head, nozzles, and supports
1. In accordance with JB/T7261-94, when a heat exchanger uses new fins or a new brazing process, heat treatment is required; the burst pressure shall be not less than 1.5 times the design pressure, with 1.25 considered acceptable. 2. The unit of a plate-fin heat exchanger consists mainly of the core, end caps, nozzles, and supports
1. For blasting tests, at a factor of 5, the dimensional tolerances of the head and nozzles of finned heat exchangers after assembly must comply with the specifications in JB/T7261-94. 2. It consists of fins, partitions, seals, and guide vanes
I just checked: 1. Heat treatment: 1.5, 1.25; 2. Core, head, nozzles, and supports
Last edited by jia717 on 2009-9-3 21:52 in this post: 1. Fin burst test: 5 times the fin breaking strength; 2. Partition, fins, seal