[TRNSYS-users] TYPE 927

David BRADLEY d.bradley at tess-inc.com
Wed Mar 24 23:00:15 PST 2021


   I would definitely suggest putting in a storage tank. One thing you 
can do is to have the heat pumps feed hot water to the storage tank and 
have the radiant floor and radiators draw as needed from the storage 
tank. In the real world (not just in the simulation) the heat pumps will 
struggle during times when there is little need for heat because their 
capacity is fairly fixed (assuming they are constant speed compressor 
devices) and when there is little load, the hot water that they produce 
will circulate through the system and return to the heat pump with only 
a small drop in temperature. Heat pumps don't like their return 
temperature to get too high and they shut themselves off if it does. I 
learned that the hard way in an actual building after not believing what 
TRNSYS was telling me!!

   As for the heat pump data file, if you have access to the TESS HVAC 
library you will find heat pumps that use a normalized data file meaning 
that they can be resized by adjusting a few parameters rather than by 
recreating the data file.

kind regards,


On 03/24/2021 12:10, Luis Santos via TRNSYS-users wrote:
> Hello,
> I´m new to the software TRNSYS and I´m still confused about how many 
> and which components do I need for my simulations.
> The site is located in Cork (Ireland) and its present heating system 
> relies on a gas-fired boiler. For my master thesis I need to simulate 
> the performance of the boiler itself, a geothermal heat pump (both 
> connected to radiators) and at last the GSHP connected to a 
> theoretical underfloor heating. I don´t have any informations about 
> the piping system nor the circulating pumps, and I´m wondering if I 
> need a storage tank. A central heating (church) needs a tank, or can 
> the water be transferred directly to the radiators?
> I want to use a water-to-water heat pump (geothermal/vertical) to heat 
> a church with radiators. Since the climate doesn´t require any 
> cooling, the heat pump should only be applied for heating purposes. 
> After one chooses a heat pump of a certain manufacturer, do we need to 
> insert the values manually in the external files? I´ve seen examples 
> where there are more than 500 lines in Excel, is there an easier way 
> to do this?
> I´m sorry for the long and complicated text. Thank you in advance
> Luís
> Master in Thermal Energy
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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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