Help needed! How does SW6 determine the main design parameters of the heat exchanger based on process conditions?
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This post was last edited by WallaceLee on 2020-5-20 at 14:29. I am currently designing a fixed-type heat exchanger, and the parameters known for this heat exchanger so far are as follows: 1. Gas operating pressure. 1. Tube train: semi-water gas, with an operating pressure of 0.7 MPa. 2. Shell side: Shift gas, operating pressure of 0.68 MPa. II. The temperature difference between the shell wall and the tube wall is 50°C, with tt > ts. The temperature of the fluid in the shell side ranges from 220~400°C, while that of the fluid in the tube side ranges from 180~370°C. III. The heat exchange area calculated based on the process parameters is 130 m2. My question now is: (1) How to determine the design temperatures for the tube side and shell side in SW6? Are we taking the maximum values of the shell side temperature and the tube side temperature, which are 400°C and 370°C respectively? (2) How are the inlet and outlet temperatures of the shell side and tube side determined? (3) What does tt＞ts mean? Gang temperature > Shell temperature? Is it still the wall temperature that is greater than the shell temperature? (4) How to determine the average temperature along the length of the cylinder and the average temperature of the heat exchange tubes along their length based on the known conditions? Welcome to all experts who can answer! ! ! !
For this device, the design temperature must be no lower than the highest temperature under operating conditions; the average temperature can be taken as the arithmetic average of the inlet and outlet temperatures
Additionally, the design pressure could be considered to be slightly higher than the current value; generally, the design pressure should be greater than or equal to the maximum operating pressure, and it is advisable to design according to the most stringent conditions for greater safety
This post was last edited by Sun Hui_XU2o5 on 2020-5-21 09:46. For design pressures and temperatures, you can refer to these values; they are based on the design specifications of a major design institute. For fixed-tube-sheet heat exchangers, the average temperatures along the shell and the heat exchange tubes are generally determined through process calculations. If these values are not provided to us, then the average temperature along the shell is taken as the average of the temperatures at the inlet and outlet of the shell side, while the average temperature along the heat exchange tubes is taken as the average of the temperatures at the inlet and outlet of both the shell side and the tube side. Of course, this method is not very accurate; however, when it is not possible to obtain specific values from the relevant departments upstream, this rough estimation can be used as a reference.
Could you provide a version without watermarks? Thank you so much! ! !
This post was last edited by goldliyang on 2020-5-22 at 16:15
This post was last edited by goldliyang on 2020-5-22 at 16:16. Is the guy online right now? Would it be convenient to modify your settings for adding friends? . I can’t add you on QQ