Re: [TRNSYS-users] Mathematical description of ASHP Type941

Dear Matt,

Thank you very much for your response. I will give a try and see if I can perform a sample calculation using the equations provided in the source code. If I have any further questions, I will let you know.

Thanks again for the help.

Zhe Li

From: trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] On Behalf Of Matt Duffy
Sent: 07 March 2013 17:54
To: trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] Mathematical description of ASHP Type941

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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