[TRNSYS-users] heat pump type668

[David BRADLEY]

If you are getting negative temperatures from the outlet of the heat 
pump source side that means that the source liquid is coming into the 
heat pump cold (probably from the ground). There are legitimate reasons 
why this can happen in the real world. It could be that your ground heat 
exchanger is small and therefore does not absorb enough heat from the 
surrounding ground. It could also mean that your application is in a 
cold climate and that the ground temperature is too low for the heat 
exchanger to gain any useful energy. It is possible to change to using a 
glycol working fluid but that is often prohibitively expensive.

kind regards,

  David



On 04/16/2018 00:42, berkane ahlem via TRNSYS-users wrote:
> dear sirs,
> i'am using the type 668 (water to water heat pump ) in trnsys16
> coupled with horizontal ground  heat exchange type556 for heating a
> storage tank,when i'm using 1-minute  time step and  I'm increasing
> pump flow rates The temperature of the outlet load  is set,but I have
> a problem with the  values negatives temperature of  outlet source . I
> do not know where is the problem exactly
> please find the attached program  in trnsys
> thanks
>
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
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 at tess-inc.com

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

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