Help: Issue with output values from HTRI calculation table

The power calculated by HTRI is also determined using the formula Q=cmΔt; it has its own database of material properties, from which the specific heat capacity is obtained. It can also be entered manually, but HTRI will only issue a warning about an imbalance in heat transfer power.

Thank you for Daidongjie’s reply. I have another question: where do I enter it manually? Thank you!

INPUT SUMMARY--Entered in PIPING

Thank you for Bingman’s reply. I gave it a try; it’s not available in INPUT SUMMARY--PIPING, but it is available in INPUT SUMMARY--PROCESS. However, the values shown in the output table are still the software’s own calculated values.

It is not necessary to enter the inlet and outlet temperatures for the hot and cold streams; one degree of freedom should be left, allowing you to manually enter the heat transfer amount

I tried, but it still didn’t work. In INPUT SUMMARY---, for hot fluids only the inlet temperature needs to be entered, while for cold fluids, the inlet and outlet temperatures must both be entered ； INPUT SUMMARY--PROCESS: The “EXCHANGER DUTY” value is set to 1500KW, but why is the calculated value still displayed in the TEMA SPEC SHEET? ?

This post was last edited by yajie0321 on 2010-1-29 at 16:19. The fluid properties on the cold and hot sides must be entered. There are a total of 7 parameters related to the heat load: the flow rate of the fluid on each side, the inlet and outlet temperatures, as well as the heat load itself. There are several possible scenarios: 1. In cases where there are 6 parameters in total—namely, the flow rates of the fluids on both sides and their inlet and outlet temperatures—you enter all of these values manually, leaving the heat load value blank. In this situation, the program will calculate the heat loads for both the cold and hot sides based on the 6 parameters you entered. If the heat loads on the cold and hot sides are not equal, then the program will provide the average value of the two heat loads. The program will issue a warning when the ratio of the difference between the two heat loads to their arithmetic average exceeds 5%; it will not issue a warning if the ratio is less than 5%. Therefore, when entering parameters, it is best to leave one of the six parameters – namely the flow rates of the fluids on both sides and the inlet and outlet temperatures – unentered, so that the program can calculate it. 2. With the six parameters of flow rates of the fluids on both sides and inlet and outlet temperatures, if only 5 parameters are entered, the value for heat load will be left blank; in such a case, the heat load for one side can still be calculated. The program will then automatically compute the heat load, and use this value to determine the parameter for the other side. 3. Again, with the six parameters in total, if only 5 parameters are entered and the heat load is provided manually, the program will calculate the heat load for the side for which all three parameters (flow rate and inlet/outlet temperatures) are available, while using the value you entered as the heat load for the other side. If the two heat loads are not equal, the program will ultimately provide the arithmetic average of the two values as the heat load. The program will issue a warning when the ratio of the difference between the two heat loads to their arithmetic average exceeds 5%; it will not issue a warning if the ratio is less than 5%. 4. Among the three parameters of flow rate, inlet temperature, and outlet temperature, two parameters are provided for each side – the cold medium side and the hot medium side – after which the heat load value is entered manually. The program then uses this manually entered heat load value as the final heat load, and calculates the missing parameter for each side based on that value. The above explanation applies only to HTRI. I’ve written so much; I’m not sure if it’s clear enough

Once the inlet and outlet temperatures at one end are determined, the heat transfer amount is fixed; no further input is needed. Just let me know what you want

I’m sorry for keeping everyone waiting so long on this issue; let me think about it first. Here are the parameters: Cold fluid: Natural gas. Flow rate: 36,300 KG/H. Inlet and outlet temperatures: -5°C/40°C. Pressure: 34 barg. Hot fluid: Steam. Flow rate: 10,000 KG/H. Inlet temperature: 150°C. The outlet temperature is yet to be determined; it is required that all the steam at the outlet be condensed. I’m wondering if the steam flow rate is too high ?

This issue has been bothering me for a long time. I have another question: when logistics are generated using HTRI based on PRO, does it use its own calculated enthalpy values or those from PRO2? I have done the calculations, and found that there is a significant difference between the results obtained by HTRI and PRO2; it’s possible that the property values I used in my calculations are quite complex.