Luís,
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,
David
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
LuísMaster in Thermal EnergyFEUP
_______________________________________________ TRNSYS-users mailing list TRNSYS-users@lists.onebuilding.org http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 3 North Pinckney Street - suite 202 Madison, WI 53703 USA P:+1.608.274.2577 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com