[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TRNSYS-users] modulating air-source heat pump

Laura,

  There are various ways that heat pumps modulate and how you model them depends on how they modulate. Perhaps most simply some heat pumps contain a single speed compressor that turns on and off as required by the home. Those are best modeled by using a minute timestep in your simulation and allowing a controller model to switch the heat pump compressor and fan. More recently heat pumps with variable speed compressors have entered the market. The compressor speeds up and slows down to provide more or less heating and cooling as needed by the building. It is a bit harder to model these devices because it is frankly difficult to get manufacturers to say how the compressor reacts to changing inlet conditions. We have made some guesses about the internal control mechanisms and have written some heat pump components that modulate the compressor either to maintain a constant outlet temperature or to maintain a constant inlet/outlet temperature difference. The models do require manufacturer data but it is usually data that can be obtained freely online. You can contact me directly and I can explain in a bit more detail.

kind regards,

 David



On 09/27/2017 13:23, Laura Guillon via TRNSYS-users wrote:

Hello everyone,

 

My questions are the following :

  1. How to simulate a modulating air-source heat pump with TRNSYS, in order that it provides only the amount of heat required by the house ?
  2. Do the external files used to define the ASHP performance represent the typical working of an ASHP ? Or do I need to find data from manufacturers ?

 

Thank you very much for your help!

 

Laura

 

Laura Guillon, Jr. Eng M.A.Sc

Project Leader


cid:image001.jpg@01CC82A8.133EEF70 
Natural Gas Technologies Centre

1350 Nobel, Suite 150, Boucherville, Quebec J4B 5H3 (Canada)
Tel.: 450-641-0021
laura.guillon@ctgn.qc.ca

www.ctgn.qc.ca

 

 



_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@lists.onebuilding.org
http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org


-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com