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Re: [TRNSYS-users] Nominal values for type 927
Emre,
You need to be a bit careful here. The parameters you list in your message that are listed on the spec sheet for the EXW060 heat pump are at a given set of conditions chosen by the manufacturer for a given rating condition (water loop heat pump, ground loop heat pump etc.). They may be VERY different from the rating condition assumed by the model. Each external data file that is created for Type 927 is normalized to a given rating condition and it's imperative that the user enter the parameters at the specified rating condition. This rating condition is typically listed at the bottom of the external data file. In the case of Type 927, the default heating performance data file lists:
!Trane WPWD 024 Normalized at Load 7 gpm 80.0 EWT, Source 7 gpm 50.0 EWT
A closer look at this data file shows that it accounts for three load flow rates (smaller, normal, larger), three source flow rates (smaller, normal, larger), and a variety of source and load inlet temperatures. To use this model correctly, the user would enter the capacity and power at the normal load flow, normal source flow, a 80 F inlet load temperature and a 50 F entering source temperature. From the limited screen capture you posted, the normal flow rates would be 12.5 gpm for both source and load (the middle of the 3 flows). Unfortunately your screen capture ends ONE LINE from me being able to tell you exactly what the numbers should be at 50 F source, 80 F load and 12.5 gpm for both source and load flows. But it's on the next line down from the end of your screen capture; likely right around 88,000 BTU/hr and 2.4 kW.
Rated heating capacity per heat pump : 88,000 Btuh
Rated heating power per heat pump : 2.4 kW
Rated source flowrate per heat pump : 12.5 gpm
Rated load flowrate per heat pump : 12.5 gpm
<Second thing I entered Rated heating capacity = 64252 kj/hr and rated heating power 17847 kj/hr in type 927. then I looked heat pump power consumption with plotter. the value is going about 24000 kj/hr .Is this logical , can heat pump power consuption would be greater than nominal power consumption?>
Absolutely it can. The parameters you enter are at a set of conditions as I just described. Warmer source temperatures, cooler load temperatures, and increases in flow rate can results in heating capacities higher than that at the rating conditions.
If you look back through the archive and check the documentation, you'll find hints and tips to create your own external data files for the exact heat pump that you are using.
Jeff
---
Jeff Thornton
President - TESS LLC
3 N. Pinckney Street, Suite 202, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
On 09/14/2019 1:08 pm, Emre Arpaci via TRNSYS-users wrote:
Hi everyone.
Now for this heat pump for type 927 parameters are these
rated heating capacity per heat pump : 60,900Btuh = 64252 kj/hr
Rated heating Power per heat pump = 60900Btuh/COP = 60900/3.6
Rated source flowrate per heat pump : 5 ton = 5000 kh/hr
What about rated load flowrate that i will enter type 927 from this catalog data ? am I correct?
Second thing I entered Rated heating capacity = 64252 kj/hr and rated heating power 17847 kj/hr in type 927.
then I looked heat pump power consumption with plotter. the value is going about 24000 kj/hr .Is this logical , can heat pump power consuption would be greater than nominal power consuption?
regards
Emre
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