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Hi David,
Please could you clear my doubt as below.
From: Usman Qayyum (Doctoral Researcher)
Sent: 01 June 2023 21:22 To: thermalenergysystemspecialists@gmail.com <thermalenergysystemspecialists@gmail.com> Subject: FW: Type 3 Pump missing in TESS Hi David, Thank you very much for your suggestions. i have been able to run the model but 1 problem is again coming . When I run the model for longer period of time (more than 72 hours) the attached error comes ( Error 200). My file names 2bedroomworking22-05-23.
2nd thing in my simulation (Simulation 1) I am getting minimum COP 0 and difference between surface and return temperature 7.6 C (see attached simulation 1)
But in other simulation (Simulation 2) I am getting same minimum COP 0 and difference between surface and return temperature 1.6 C (see attached simulation 2). In both cases all inputs are same .
One more doubt, how can I fixed the ambient temperature and return water temperature into the heat pump instead of weather file and storage tank input.
Thanks Usman
From: Usman Qayyum (Doctoral Researcher) <Usman.Qayyum2@brunel.ac.uk>
Hi David, Thank you very much for your suggestions. i have been able to run the model but 1 problem is again coming . When I run the model for longer period of time (more than 72 hours) the attached error comes ( Error 200). My file names 2bedroomworking22-05-23.
2nd thing in my simulation (Simulation 1) I am getting minimum COP 0 and difference between surface and return temperature 7.6 C (see attached simulation 1)
But in other simulation (Simulation 2) I am getting same minimum COP 0 and difference between surface and return temperature 1.6 C (see attached simulation 2). In both cases all inputs are same .
Thanks Usman
From: Technical Support <TechSupport@tess-inc.com>
Usman, There are a few things that need to be addressed in your simulation. Some of these comments may already have been addressed because I don't think that the version of the *.b18 that you sent me wasn't the one that you are using in your actual simulation. It didn't have the inputs for the heat coming from the radiators and all the zones were set up with idealized HEATING in TRNBuild. I fixed up the *.b18 that you sent me to take care of those issues. If you haven't already done so, make sure that you go into your *.b18 and turn off HEATING in all of your zones. Otherwise they will stay 20C and your system won't try to turn on. - the timestep needs to be something on the order of 1-5 minutes. TRNSYS can only make one control decision (pump on/off, heater on/off) per timestep. With a 1-hour timestep the length of time between one opportunity to make a control decision and the next is too long and the system can't be controlled within tolerances. Often you'll get convergence problems. - the fractional flow rates going to the radiators does not add up to 1. If each radiator gets the same flow rate then Type647 inputs 3-11 should all be set to 0.125 (1/8 of the total flow). The exception is outlet 4, which is not connected to anything. It's "fraction of flow" input should be set to 0. - there are 11 inputs into your Type649. Three of them aren't connected to an output but they are still contributing 200kg/h of liquid at 20C to the overall flow. - the pump power for your distribution pump (Type114) should be about 10W not 10,000W given its flow rate. In general, set pump power based on 300 W/(L/s) - regarding these past three points; it is helpful to put an online plotter with the temperature and flow rate of liquid leaving every component in a loop so that you can check for mass flow balance problems and make sure that the temperatures around the loop make sense. The temperature leaving a pump should be only at most a degree higher than the inlet temperature. The temperature leaving the radiators should be 5 or so degrees less than the inlet temperature. Using an online plotter to check those flow rates and temperatures is how I debugged that part of the loop. - your controller (Type106) should be connected to both the pump (Type114-2) as it is but also to the heat pump heating signal. The heat pump's cooling control signal should be unconnected and set to 0. This is important because cooling takes precedence over heating in that model and if both the heating and cooling control signals are set to 1 then cooling will be active. Since cooling is unconnected and set to 1, the HP is only ever going to cool the liquid. - Type114-2's power should be set to 3W based on the flow rate that you have chosen. That flow rate seems a little low to me but it might be correct. kind regards, David --- Technical Support Team
-------- Original Message --------
Please check it.
From: Technical Support <TechSupport@tess-inc.com>
Usman, The file I need is called 2bedroomfinalupdated1.b18; the one you attached has the same name but the extension *.idf instead of *.b18 kind regards, David
--- Technical Support Team
-------- Original Message --------
Hi David, Please have a look on attached building file. Also check the attached TRNSYS file, i have made every my try to reach temp 60C but could not successful. Please advise me , in this regard i follow your instructions but again same thing.
Thanks Usman
From: Technical Support <TechSupport@tess-inc.com>
Usman, Could you also please send me the building file (2bedroomfinalupdated1.b18)? I am not able to run the project to look at what happens; the screen capture that you sent just shows two warnings that are not relevant to the situation. Typically the pump power should be on the order of 300 W/Lps. That would mean about 10W rather than the 10,000W that you have set. If you are trying to make sure that the water temperature going to the radiators is 60C then I would keep the TES hot by means of the heat pump rather than by creating a pump that draws a lot of power. If the tank isn't staying hot then probably the heat pump doesn't have enough heating capacity to keep it warm. As a side note, you might also want to look at the radiators. Typically those have a low flow rate (maybe 0.02 kg/h) and a high delta T. Your system is feeding them about 13 kg/h, which means that they may not be transferring the kind of energy that you want them to and that they have a much smaller delta T than intended. kind regards, David
--- Technical Support Team
-------- Original Message --------
Hi David, Thanks for helping me. Please have a look on two attached files. In one file (not working) , i put flow rate 200 kg/hr and power 100000 . In other file i put flow rate 120 kg/hr its working but not reaching temperature up to 60 C . in this file maximum temperature just reaching 30 C even though i made setting 60 C in Type 106 .
Thanks Usman
From: Technical Support <TechSupport@tess-inc.com>
Usman, Type3 was a component in the standard library that could (somewhat confusingly) be used to model either a constant or a variable speed pump. It was replaced by Types110 and 114 and is no longer available. Can you please send me the *.lst file that is generated when you run your simulation? Please also send the project itself (*.tpf) and any other files that are needed in order to run the simulation. kind regards, David
--- Technical Support Team
-------- Original Message --------
Good Morning,
Hi, I am Usman researcher in Brunel University London. I have some issues when i am using Type 110 or 114 Pumps. When I am increasing the mass flow rate above 10kg/hr it gives error 200 (this type was found in more than one DLL. A duplicate of type 647 was found in tess hydronics. Please help me in this issue and also type 3 pump missing in tess library.
Thanks. Usman |
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