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Viewing 15 posts - 1 through 15 (of 15 total)
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  • March 29, 2024 at 2:19 pm in reply to: Suddenly I can not run the cycle tempo program #5675
    Teus van der Stelt
    Keymaster

    Dear Achmad, Your antivirus software may consider Cycle-Tempo unsafe. Can you indicate in the antivirus software that Cycle-Tempo should be ignored?

    June 1, 2023 at 10:18 am in reply to: simulating HVAC systems . #4045
    Teus van der Stelt
    Keymaster

    Dear Harish,

    You can only upload images. I recommend that you take a screenshot of the system and the input summary you want help with.

    Best regards,
    Teus

    February 2, 2023 at 11:14 am in reply to: Error #3093
    Teus van der Stelt
    Keymaster

    Dear Henrique,

    A singular matrix usually means that there are in system matrix two similar mass or energy equations. As a consequence, the system cannot be solved. Please, send us your input file (.gui) such we can have a look at your input data. It is hard to tell from the error message what the reason is for the error, usually it is wrong choice of component types and/or EEQCODs.

    Best regards,
    Teus

    February 2, 2023 at 11:08 am in reply to: TYPE OF SIMULATION #3092
    Teus van der Stelt
    Keymaster

    Dear Henrique,

    I am not entirely sure what you mean, but you could enter a very small DELM for sink/source 9 (or 10) in case you do not want a nitrogen flow (you probably cannot make it entirely 0). Or, if you would like to have calculated the mass flow nitrogen by Cycle-Tempo, you could somehow make the DELT2 = 0 for the heat exchangers (or any specific value you require) to control the mass flow.

    Best regards!

    February 2, 2023 at 10:56 am in reply to: Liquefaction System #3091
    Teus van der Stelt
    Keymaster

    Dear Henrique,

    With respect to the first question: you can use here just a node. By specifying XINL = 0 and XINL = 1 in the “extra conditions” of the outgoing pipes. See also in the Reference manual, page 2-51/2-52.

    To answer your second question, please send us your input file (.gui) such that we can have a look, because there can be many reasons why you get this error message. It is hard to tell without knowing what data you used for your input.

    Best regards,
    Teus van der Stelt

    December 14, 2022 at 10:21 am in reply to: Fluidprop not working on MacOs and Excel 365 #2897
    Teus van der Stelt
    Keymaster

    Dear John,

    Unfortunately, FluidProp on macOS does not work with Excel 365 (yet), it works only with older Excel versions, e.g., Excel 2016 (see the accompanying Readme.txt file in the FluidProp program folder).

    Best regards,
    Teus van der Stelt
    Asimptote bv

    September 26, 2022 at 7:48 pm in reply to: Excel file export / Sensitivity analysis #2209
    Teus van der Stelt
    Keymaster

    No, indeed, it is not possible to transfer data to Excel automatically. You can do it only manually by copying a table in Cycle-Tempo and paste it in Excel or you can write your own application in Excel in VBA to import data from output files of Cycle-Tempo (*.out or *.ori files).

    September 19, 2022 at 7:19 pm in reply to: Helium Liquefaction System #2181
    Teus van der Stelt
    Keymaster

    If you would like to separate just vapor and liquid then you could also use a node with EEQCOD = 1. See reference manual page 2-51/2-52.

    September 19, 2022 at 4:30 pm in reply to: Cycle-Tempo discussion forum #2178
    Teus van der Stelt
    Keymaster

    If you login with your account, you can initiate new topics.

    September 19, 2022 at 4:27 pm in reply to: Internal Pipe Nmber #2177
    Teus van der Stelt
    Keymaster

    In fact, it is the order of the pipe numbers. E.g., when your systems contains pipes 1, 2, 5, 6, and 8 then the internal pipe number are 1, 2, 3, 4, and 5

    July 18, 2022 at 9:44 am in reply to: Ways of specifying mass flow rate #1818
    Teus van der Stelt
    Keymaster

    Yes, these are the only ways to specify a mass flow rate. And, yes, when there is source (sink/source with just one outgoing pipe), then the software always considers DELM as an incoming stream, regardless of whether it is a given negative value.

    July 18, 2022 at 9:33 am in reply to: Negative Exergy destruction values #1816
    Teus van der Stelt
    Keymaster

    If you make the air composition exactly like the Baehr environment conditions (it differs from the standard air composition and p = 1.01325 bar in your case) then you can see that the exergy flow in source 1 is only 0.01 kW, which may be a round-off error, as it should be 0 kW. In sink/source 2 the temperature is increased by 5 K. As a consequence the exergy flow to the system is 0.04 kW.

    In source 7 the pressure and temperature of the flue gasses are 2 bar and 250 C and the composition differs from the environment composition, which introduces both a thermo-mechanic and chemical exergy flow to the system.

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    July 5, 2022 at 10:07 am in reply to: Negative Exergy destruction values #1772
    Teus van der Stelt
    Keymaster

    Dear Sreekanth, if could upload a specific, simple, example of such a case, that would be helpful.

    June 28, 2022 at 10:17 am in reply to: Calculation of specific heat capacities #1719
    Teus van der Stelt
    Keymaster

    Attached you can find a screenshot that shows how you can calculate specific heat capacities with FluidProp in Excel.

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    June 28, 2022 at 9:32 am in reply to: Calculation of specific heat capacities #1716
    Teus van der Stelt
    Keymaster

    Dear Turbouser, unfortunately, there isn’t. You can only use FluidProp, e.g. in Excel, and the HeatCapP function to retrieve cp of a fluid.

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Viewing 15 posts - 1 through 15 (of 15 total)