HYSYS operation issues

Additionally, as further clarification: how is the Process Utility Manager set up, and what is its purpose?

The Process Utility Manager in Home is used to enter relevant utility data. Under the energy flows, there is a field labeled “Utility Type”; you can select the utilities specified in Process Utility Manager, and the corresponding usage amount for those utilities will be displayed (for example, for steam, it will show how much of that utility is used per hour). If you specify the utilities to be used for certain energy flows, you can also go to Home-Flowsheet Summary-Utility Summary to view the total usage of each utility. In summary, I think this is the feature you want.

Thank you very much; you have exactly explained what I meant. What I want to do is set the Utility Type in the flow setup in order to directly calculate the amount of utilities required. However, I’m not sure how to configure the Process Utility Manager – there are many parameters available, including temperature but no pressure. There are also parameters such as HTC and cost index. Could you please explain in detail how to set these parameters? In my example, I want to generate 0.4 MPag of saturated steam by setting the Utility Type.

Regarding your requirements, you don’t need to set parameters such as HTC and Cost Index; those are used for calculating heat exchange areas and conducting economic analyses. Since all you need to know is the amount of steam required, you just need to ensure that the inlet and outlet temperatures sowie the Eff CP values you set are correct – no other changes are necessary. As for Eff CP, you just need to calculate the latent heat plus the sensible heat at the time of phase change, and then multiply that by an efficiency factor (such as 95%, 96%).

This post was last edited by *aop on 2017-3-3 09:15. Thank you very much; please help me check whether this setup is correct. I want to know how much 0.4MPag saturated steam will be produced by the steam generator. The feedwater temperature is 104°C, and the temperature of 0.4MPag saturated steam is 151°C. Therefore, I have set the inlet and outlet temperatures to 151°C. According to my research, the latent heat of 0.4MPag saturated steam is 2108.2 KJ/KG, while the specific heat capacities of water at 104°C and 151°C are 4.21 and 4.288 KJ/KG·K respectively. Taking the average of these values gives 4.249 KJ/KG·K. The temperature difference is 47°C, so the sensible heat is calculated as 4.249 × 47 = 199.7 KJ/KG. The total heat, consisting of latent heat and sensible heat, is 2307.9 KJ/KG. Multiplying this by an efficiency of 95% yields 2192.5. I have set the Eff CP value to 2192.5. Please check if this setup is correct. Also, I think it’s not necessary to set the inlet and outlet temperatures, right? Does this mean that it cannot be calculated automatically in HYSYS? Is manual setup required?

Your calculation is correct... Additionally: 1. Import and export temperatures are indeed not necessary, but they can help you determine what temperature settings should be used for the utility systems in different areas. 2. In Utilities Manager, this inlet and outlet temperature is not calculated automatically, so it must be entered manually. Automatic calculation requires strict simulation. Different simulation objectives require different methods.

I would like to ask how to open multiple windows in HYSYS at the same time