09-04-8议题——折流杆式换热器的热力学计算问题（参与 ...？ 折流杆换热器（rod baffle ）最好采用philips petroleum co公司的软件进行热力学计算。 设备设计并不难，难的是工艺计算。如果放开了加设计余量，那也不难。 design design cases are generally for new exchangers, or for existing exchangers needing a new tube bundle. when this option is used, the program will calculate the smallest diameter exchanger and the fewest number of exchangers in parallel and series which satisfy the specified process and exchanger geometry constraints. the principle process constraints are: 1. maximum pressure drop and maximum velocity 2. temperature range and approach 3. heat balance requirements 4. fouling resistance the principle construction constraints are: 1. shell diameter 2. tube length 3. number of tube passes 4. number of shell passes if the geometry is fully specified, then the program will calculate the minimum number of exchangers required that will satisfy heat duty and process flow conditions. for design cases, a minimum of 5 of the following 6 entries must be specified: hot stream flow rate, cold stream flow rate, hot stream inlet temperature, cold stream inlet temperature, hot stream outlet temperature, and cold stream outlet temperature. flow rate and temperature values that are not specified (by toggling the button closest to that flow rate or temperature as set) must be tagged as calculate, by toggling the button. flow rate units available are 1000 pounds/hour (us) and 1000 kg/hour (si). temperature units are degrees fahrenheit (us) or degrees celsius (si).查看更多
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