[TRNSYS-users] question on GSHP and vertical U tube ground heatexchanger

[Jeff Thornton]

<I have a question: can I design a system with GSHP using TRNSYS 16? or
maybe i can just do a simulation?>

Most GSHP "design" programs use a simple equation to estimate the impacts
of heat build-up, thermal resistances, etc to predict the peak
temperatures.  Good simulations account for the same factors but also add
the impacts of load diversity, timing and other important factors.

<And if it can, how can i design the vertical U-tube ground heat exchanger
in TRNSYS 16?>

You run a detailed simulation for 20 years and monitor the return fluid
temperatures; adjusting the HX lengths, spacing, etc to keep the
temperature within your bounds.  A detailed simulation is usually more
accurate than the simple design tools.  There are a number of ASHRAE
papers that compare detailed simulations to the design programs.  Look for
McDowell and Thornton ASHRAE papers from about 5-10 years ago.

Jeff


Jeff Thornton
President - TESS, LLC

22 North Carroll Street - Suite 370
Madison WI 53703 USA

Phone: 608-274-2577
Fax: 608-278-1475
E-mail: thornton at tess-inc.com
Web: www.tess-inc.com