[TRNSYS-users] problem with type 668

[Jeff Thornton]

We don't officially support TRNSYS 16 as it's two versions out of date.  
But I took a quick look at your project and several things stood out 
immediately.  The first is that you are using a 1-hour time step.  That 
means your control decisions are made once an hour - likely the biggest 
cause of your issues.  Typically a sysytem like this should run at 
around a 1-minute time step.  The other thing I caught was that your 
pump flow rates are only about a third of the minimum flow rate that the 
heap pump expects.  This will create a very large temperature difference 
across both sides of the heat pump.

Jeff

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton at tess-inc.com


On 04/10/2018 8:19 am, 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, the problem is  The
> temperature of the  outlet source and The temperature of the outlet 
> load it's
>  not acceptable
> please find the attached program  in trnsys
> thanks
> 
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