[TRNSYS-users] water-to-water heat pump

David BRADLEY d.bradley at tess-inc.com
Thu Aug 20 13:41:01 PDT 2020

Prof Bina,

   Type927 models an on/off heat pump that has a constant speed 
compressor. In order to maintain a desired outlet temperature you would 
need to use a model of a variable speed compressor heat pump that can 
internally adjust its capacity. We have written such a model and it is 
scheduled for release sometime later this year.

   A double u-tube well can be modeled using Type557, which is in the 
TESS GHP library.

kind regards,


On 08/20/2020 04:27, saeid mohammadzadeh via TRNSYS-users wrote:
> Dear users;
> I hope you all are well and safe. I am modeling a water to water 
> ground source heat pump (Type 927) in our lab and would like to 
> validate it with the actual data.
> I have two main questions as follows:
> 1- How we can control the heat pump unit based on the outlet load 
> temperature (for example 40 C in winter). Since there is no 
> thermostat in the room, only we give the desire outlet load 
> temperature (temperature of the water that goes to the fan coil in the 
> room). Therefore, HP maintains this temperature all time.
> 2. In the gound loop side, the fluid goes to the two parallel vertical 
> "double" U-tube wells. So my question is how is it possible to model 
> Double U_tube in TRNSYS?
> Thank you very much in advance, I am looking forward to hearing from you.
> //Best Regards//
> /Saeid Mohammadzadeh Bina, Dr. (Eng.)/
> //-------------------------------------------------//
> /Akita University/
> /Graduate school of International Resource Sciences//.
> 1-1 Tegata gakuen-machi, Akita 010-8502, Japan/
> /Tel: //+815068665026 (Japan)/
> / +989141011757 (Iran)///
> /E-mail: //d9515254 at s.akita-u.ac.jp/ 
> <mailto:s.mohammadzadeh66 at gmail.com>//
> /mohammadzadehsaeid at yahoo.com <mailto:mohammadzadehsaeid at yahoo.com>/
> //-------------------------------------------------
> //
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Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

d.bradley at tess-inc.com


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