[TRNSYS-users] type 505 water source heat pump

[David BRADLEY]

Beatrice,
We did some work awhile ago to look at whether the performance of 
various kinds of HVAC equipment scale linearly or not. We looked at 
things like Capacity divided by RatedCapacity and PowerUse divided by 
RatedPower and we looked at them over a wide range of operating 
conditions. We found that among the HVAC components that we looked at, 
heat pumps (water source, air source, etc.) and chillers (both water and 
air cooled) scale very well and very linearly. The one caveat is that at 
very low part load ratio, the type of compressor used in the device does 
matter. In general, it is fine to leave the normalized performance data 
files alone and to enter the capacity, flow rates, and rated power as 
parameters to the model.
Best,
David


On 6/6/2011 21:53, by_pro wrote:
> Dear Trnsys users,
>
> I would like to use type 505 (water to water heat pump module) to 
> simulation a geothermal source heat pump system. According to the the 
> pre-calculation, the heating and cooling demand of the space is much 
> higher than the normalized power in the data file. as I currently 
> understand (from a response explained to one of the 505 user), 
> generally we can scale the rated capacity, flow rate and power of the 
> device without having to create different data files each time.
>
> Could anybody explain more how to scale the data file? Is it linearly 
> proportion? or show me an example if possible.
>
> Thanks in advance
>
> Beatrice
>
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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