Issues with compressor curve input in HYSYS
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May I ask, when entering compressor characteristic curves in HYSYS, can only curves in the flow rate-head-efficiency format as shown in the diagram be used? Why can’t I enter it in the form of flow rate-pressure ratio-efficiency? There are items in Plus that are not available in HYSYS, which is really annoying. If I want to use HYSYS to simulate the characteristic curves of flow rate, pressure ratio, and efficiency for compressors, is that possible? I hope the experts can provide an answer.
In HYSYS, the compressor module typically uses flow-head-efficiency (i.e., the hydraulic curve) to input the characteristic curves. This method of input is based on the relatively common representation method for the performance curves of centrifugal compressors. If you want to enter data in the form of flow rate-pressure ratio-efficiency, the compressor module in HYSYS may not support such input. However, you can try the following methods to simulate it: 1. Convert the data: If your data is in the form of flow rate-pressure ratio-efficiency, you can convert the pressure ratio into head through calculations, based on the working fluid and operating conditions of the compressor. 2. Use Performance Curves: Select the “Performance Curves” tab, where you can manually enter head and efficiency data at different flow rates. If you can convert your data into head and efficiency, then it can be entered in this way. 3. Use other tools for assistance: Employ other calculation tools such as Excel outside of HYSYS to convert flow-rate/pressure ratio/efficiency data into the flow-rate/head/efficiency format required by HYSYS, and then import it into HYSYS. 4. Script automation: If such operations need to be performed frequently, consider using HYSYS’s automation interfaces, such as VBScript or Excel macros, to write automated conversion scripts. The above methods may require some additional work to be adapted for HYSYS, but they can achieve the compressor simulation you desire. If you are not familiar with these conversion processes, you may need to consult a professional with experience in this field. .
I did some more research on my own, and this problem can be solved. Among the head input units provided by HYSYS, there is an option of kJ/kg, which corresponds to the polytropic energy head of the compressor. In the formula for calculating the polytropic energy head of a compressor, the \"pressure ratio\" and \"efficiency\" are involved; since all other gas constants and inlet temperatures are already known, it is sufficient to calculate the polytropic energy head using these values and then input it into HYSYS.