Dear Matt, Thank you very much for your response. I believe I am the end-user for the version of TRNSYS 17. I am not sure which distributor that I should contact to, They are two distributors are close to me (Ireland), one is in France and another one is in Germany, However, I do remember that I actually purchased the TRNSYS version 17 using my own budget from distributor in America, I do not know if you still remember this back to last summer. Would be possible if the distributor in America could provide me the latest TESS Libraries version (17.1.03)? I will have no problem to provide any information (purchase prove) that you require. Thank you for your help. Zhe Li From: Matt Duffy [mailto:duffy@tess-inc.com]
Sent: 18 March 2013 15:37
To: Zhe Li
Cc: trnsys-users@cae.wisc.edu
Subject: RE: [TRNSYS-users] Mathematical description of ASHP Type941 Dear Zhe Li, You can see the version of your TESS Libraries by looking at the top of the ".\Tess Models\Readme.html" file or looking at the number on the external DLL's in the ".\UserLib\ReleaseDLLs" directory. With TRNSYS version 17.01.0016, the TESS Libraries version 17.1.01 were distributed. Thus, please have the primary end-user at your institution contact your TRNSYS distributor for the latest TESS Libraries version (17.1.03). The source code was likely based on a water source heat pump (WSHP) which is a water-to-air heat pump. An air-to-water heat pump is basically a backwards water-to-air heat pump, so you can look at the Type919 WSHP documentation for reference, and the new Type941.f90 source code with the new installation package should be helpful as well. Best regards, Matt Duffy On 2013-03-15 08:49, Zhe Li wrote: Dear Matt, I am currently using Version 5.3.0.0 and Trnsys version 17.01.0016. Is this the latest version? (for TESS libraries?). I am able to find the Type941.f90 text file in this version, has this been rewritten or this is the latest version which I can use to investigate how the heat pump works? Second thing is, Would be possible if you could recommend books or journal papers which the source code was written based on? Thank you very much for your help. Zhe Li Dear Zhe Li, We apologize the the component does not yet have documentation. However, it is a straight-forward, and I can summerize it. Please make sure that you are using the current version, 17.1.03 of the TESS Libraries. The source code in the ".\Tess Models\SourceCode\Type941.f90", and you can view this in a simple text editor program. This is an excellent way to see how an output such as power is calculated. It has all of the equations in an easy to follow manner in the new f90 code. Also, the "More" buttons in the proforma are also very helpful for information about the specific variables. It is a performance-map based component like most all of the other HVAC heat pump, air conditioner, and chiller component models. There is a performance map for when it is operating in heating mode, and there is a performance map for when it is operating in cooling mode. These performance map external data files are in the "InterpolateData" format (see the 08-ProgrammersGuild.pdf for more information). Like many of the other TESS heat pump components, the capacity and power in the data file (the dependent variables) are normalized, so the user can adjust the total capacity and power in the parameter of that particular component. If you have any other specific questions, please feel free to contact me or TESS technical support about the TESS Libraries. Thank you, Matt On 2013-03-07 04:42, Zhe Li wrote: Dear All, Thank you very much for your time. I have recently built a combined air source heat pump and solar thermal system for my PhD research study. After carefully reading the mathematical description (also related books) of solar thermal system for flat-plate and evacuated-tube collector, I fully understand how the energy output can be predicted from TRNSYS. However, I am struggling to understand how the ASHP Type941 is to predict the power output. It is vital for me to understand how this component works and be able to write into my final PhD thesis. I am wondering if this mathematical description has been released yet? If it is, I will be very grateful if somebody could send me a copy of it. Sorry, I have asked a similar question before, however, this is so important that I have no choice but keep asking it. Thank you very much for your help. Zhe Li
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