【Daily Question】November 13, 2015: Design of fixed-tube-sheet heat exchangers (first 80 participants + 2 rewards)

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This post was last edited by humanrzm on 2015-11-16 at 09:30. To increase the popularity of the heat exchange forum, a \"Question of the Day\" activity has been introduced there; this helps to foster active technical exchanges while also providing members with certain financial rewards. 【Daily Question】True or False: In the design of fixed-tube-sheet heat exchangers, expansion joints are necessarily required when thermal stress is high. ( ) Answer: Incorrect. An expansion joint should be installed when one of the following three conditions is met: 1) axial stress in the heat exchange tubes, 2) axial stress in the shell, 3) the pulling force between the heat exchange tubes and the tube sheet. It is not necessary to install an expansion joint simply because there is a large temperature difference. Post your answer as a reply; participating in the quiz earns you +2 wealth points (automatic addition of wealth points is enabled; no additional points or comments will be given if your answer is incorrect). Answering all questions correctly grants an additional +3 to +8 wealth points. If you provide a thorough analysis and explanation for the questions or answers, or if your explanation is based on standard criteria, you will receive extra wealth points as a reward. If your answer is correct and your analysis and explanation are accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions. Note: We will close this post after 24 hours to reveal the answers and explanations, as well as the best response (the best help). Attraction Reward: If you post a topic in this section within two days to provide a detailed explanation of the knowledge points covered in this question, please reply to this post to inform us, and we will ask a moderator to grant you +Attraction. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights. After registration, we will rank based on the content of the posts: the last-place contestant will receive +1 charm, the second-to-last +2 charm, and so on, with the highest score earning +5 charm. Other content: AC version of heat exchange equipment – “One question per day” competition post (prizes available for participation; valid indefinitely). http://bbs.hcbbs.com/thread-1320941-1-1.html “[Study and discussion on GB/T151-2014 heat exchangers] Section 2 – Terms and definitions, general requirements”. http://bbs.hcbbs.com/thread-1399249-1-1.html [Mechanical Section] – Recruitment for moderators and technicians; applications and referrals are welcome. [Valid indefinitely] [Come if you’re interested!] 】http://bbs.hcbbs.com/thread-1288857-1-1.html Starting today, the Machinery Section is offering wealth to all members of the community; go and claim your share of it now – the distribution of wealth has begun. http://bbs.hcbbs.com/thread-1489563-1-1.html